Packaging materials and packaging products

Abstract

To provide a packaging material with an increased biomass content. [Solution] The packaging material includes at least a base layer, a printing layer, an adhesive layer, and a sealant layer, the adhesive layer being in contact with the sealant layer, the adhesive layer including a cured product of a polyol and an isocyanate compound, the polyol of the adhesive layer being a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, and the polyfunctional carboxylic acid of the adhesive layer consisting solely of biomass-derived components.

Description

Technical Field

[0001] The present invention relates to a packaging material containing biomass-derived components and a packaging product provided with the packaging material.

Background Art

[0002] Conventionally, various packaging materials have been developed and proposed as packaging materials for constituting packaging products for filling and packaging various articles such as food and drink products, pharmaceuticals, chemicals, cosmetics, sanitary products, daily necessities, and others. The packaging material is composed of a laminate in which at least a base material layer containing 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 joining each layer of the laminate.

[0003] In recent years, with the increasing demand for building a recycling-oriented society, in the field of laminates constituting packaging materials, similar to the energy field, it is desired to move away from fossil fuels, and the use of biomass has attracted attention. Biomass is an organic compound synthesized from carbon dioxide and water, and by using it, it becomes carbon dioxide and water again, which is a so-called carbon-neutral renewable energy. Recently, the practical application of biomass plastics using these biomasses as raw materials has been rapidly progressing, and attempts have also been made to manufacture various resins from biomass raw materials.

[0004] As a resin derived from biomass, polylactic acid (PLA) produced via lactic acid fermentation was the first to start commercial production. However, since it is biodegradable and its performance as a plastic is significantly different from that of current general-purpose plastics, there are limitations in product applications and product manufacturing methods, and it has not been widely popularized. In addition, for PLA, a life cycle assessment (LCA) evaluation has been conducted, and discussions have been made on the energy consumption during PLA production and the equivalence when replacing general-purpose plastics.

[0005] Here, as general-purpose plastics, various types such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester are used. In particular, polyethylene is formed into films, sheets, bottles, etc., and is used for various applications such as packaging materials, and its usage amount is large worldwide. Therefore, using conventional polyethylene derived from fossil fuels has a large environmental impact. Therefore, it is desired to reduce the usage amount of fossil fuels by using raw materials derived from biomass in the production of polyethylene. For example, to date, research has been conducted on producing ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see Patent Document 1).

[0006] In addition, polyester is widely used in various industrial applications because of its excellent mechanical properties, chemical stability, heat resistance, transparency, etc., and its low cost. Polyester is obtained by polycondensing diol units and dicarboxylic acid units. For example, polyethylene terephthalate (hereinafter may be abbreviated as PET) is produced by subjecting ethylene glycol and terephthalic acid as raw materials to an esterification reaction and then a polycondensation reaction. 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 also been made to produce polyester from biomass raw materials. For example, a product using biomass-derived ethylene glycol as a monomer component has been put into practical use. It has been proposed to apply a polyester resin containing such a biomass-derived raw material to packaging materials (see Patent Document 2).

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] In conventional packaging materials, the printing layer and the adhesive layer of the laminate are formed of materials derived from fossil fuels, which has been a cause of reducing the biomass degree of the entire packaging material. Therefore, in a packaging material composed of a laminate including a base material layer, a printing layer, an adhesive layer, and a sealant layer, it has been required to further increase the biomass degree of the entire packaging material.

[0010] The present invention has been made in consideration of such points, and an object thereof is to provide a packaging material with an increased biomass degree.

Means for Solving the Problems

[0011] The present invention is a packaging material including at least a base material layer, a printing layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer, the adhesive layer contains a cured product of a polyol and an isocyanate compound, the polyol of the adhesive layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, and the polyfunctional carboxylic acid of the adhesive layer consists only of components derived from biomass.

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

[0013] In the packaging material according to the present invention, the printing layer contains a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound may contain a component derived from biomass.

[0014] In the packaging material according to the present invention, the polyol of the printing layer may be a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid.

[0015] In the packaging material according to the present invention, at least one of the polyhydric alcohol or the polyhydric carboxylic acid in the printing layer may contain a biomass-derived component.

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

[0017] In the packaging material according to the present invention, at least one of the polyhydric alcohol or the polyhydric isocyanate in the printing layer may contain a biomass-derived component.

[0018] In the packaging material according to the present invention, the base material layer may have a base material film containing polyester, polyamide or polyolefin.

[0019] In the packaging material according to the present invention, the base material film may contain a biomass polyester having ethylene glycol derived from biomass as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit.

[0020] In the packaging material according to the present invention, the sealant layer may contain a polyolefin which is a polymer of a monomer containing olefin.

[0021] In the packaging material according to the present invention, the sealant layer may contain a biomass polyolefin which is a polymer of a monomer containing ethylene derived from biomass.

[0022] The present invention is a packaging product including the above-described packaging material.

Effects of the Invention

[0023] According to the present invention, the biomass content of the packaging material can be increased.

Brief Description of the Drawings

[0024]

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Embodiments for Carrying Out the Invention

[0025] <Packaging Material> The laminate constituting the packaging material according to the present invention includes at least a base material layer, a printing layer, an adhesive layer, and a sealant layer. In the present invention, by forming the adhesive layer with a material containing a biomass-derived component, the amount of fossil fuel used can be reduced compared to the conventional case, and the environmental load can be reduced.

[0026] In the present invention, for the entire laminate constituting the packaging material, the biomass degree described below is preferably 3% or more, more preferably 5% or more and 60% or less, and still more preferably 10% or more and 60% or less. 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.

[0027] 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.

[0028] In addition to the above layers, 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, or a gas barrier coating film. When having two or more other layers, each layer may have the same composition or different compositions.

[0029] The laminate constituting the packaging material according to the present invention will be described with reference to the drawings. Examples of a schematic cross-sectional view of the packaging material 10 according to the present invention are shown in FIGS. 1 to 4. In FIGS. 1 to 4, reference numeral 10y represents the outer surface of the packaging material 10, and reference numeral 10x represents the inner surface of the packaging material 10. The inner surface 10x is the surface located on the side of the contents accommodated in the packaging product such as a bag formed from the packaging material 10. The outer surface 10y is the surface located on the opposite side of the inner surface 10x. In the present application, the term "in this order" in descriptions such as "comprises in this order" or "laminated in order" represents the order in the direction from the outer surface 10y side to the inner surface 10x side unless otherwise specified.

[0030] The packaging material 10 shown in FIG. 1 comprises a base material layer 20, a printing layer 50, an adhesive layer 30, and a sealant layer 40 in this order. The base material layer 20 includes a base material film 22. The sealant layer 40 includes a sealant film 42.

[0031] The packaging material 10 shown in FIG. 2 is provided with a barrier layer 60 between the base material film 22 and the printing layer 50 of the packaging material 10 in FIG. 1.

[0032] The packaging material 10 shown in FIG. 3 is provided with a barrier layer 60 between the adhesive layer 30 and the sealant film 42 of the packaging material 10 in FIG. 1.

[0033] In addition, for the packaging material 10 shown in FIG. 4, a first barrier layer 61 is provided between the base film 22 and the printing layer 50 of the packaging material 10 in FIG. 1, and a second barrier layer 62 is further provided between the adhesive layer 30 and the sealant film 42.

[0034] Note that the packaging material 10 shown in FIGS. 2 to 4 includes the barrier layers 60, 61, or 62. The barrier layer may have a single-layer structure such as a metal foil or a vapor deposition layer, or may have a laminated structure in which a gas barrier coating film is formed on the vapor deposition layer.

[0035] It is also possible to appropriately combine the plurality of layer structures of the packaging material 10 shown in FIGS. 1 to 4 described above.

[0036] Hereinafter, each layer constituting the packaging material 10 will be described.

[0037] (Base film) The base film 22 of the base layer 20 is a plastic film. The base film 22 may or may not contain biomass-derived components.

[0038] When the base film 22 contains biomass-derived components, the base film 22 can be formed using the following biomass polyester or biomass polyethylene.

[0039] The biomass polyester has biomass-derived ethylene glycol as a diol unit and fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. In addition to the biomass polyester, the base layer may further contain a fossil fuel-derived polyester having fossil fuel-derived ethylene glycol as a diol unit and fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. As long as the following biomass degree can be realized for the entire base layer. In the present invention, by including the biomass polyester in the base layer, the amount of fossil fuel-derived polyester can be reduced compared to the conventional case, and the environmental load can be reduced.

[0040] In the present invention, the "biomass content" may be indicated by a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement, or may be indicated by the weight ratio of components derived from biomass.

[0041] When the value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement is indicated as the "biomass content", the "biomass content" can be determined as follows. That is, since carbon dioxide in the atmosphere contains C14 at a certain ratio (105.5 pMC), it is known that the C14 content in plants that take in carbon dioxide in the atmosphere and grow, such as corn, is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, by measuring the ratio of C14 contained in all carbon atoms in polyester, the ratio of carbon derived from biomass can be calculated. In the present invention, the content of C14 in polyester is P C14 When it is set as, the content of carbon derived from biomass P bio can be determined as follows. P bio (%) = P C14 / 105.5 × 100 Note that pMC is an abbreviation for Percent Modern Carbon.

[0042] Taking polyethylene terephthalate, a typical polyester, as an example, polyethylene terephthalate is obtained by polymerizing ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms at a molar ratio of 1:1. Therefore, when only biomass-derived ethylene glycol is used as ethylene glycol, the content of carbon derived from biomass P bio in polyethylene terephthalate is 20%. On the other hand, the content of carbon derived from biomass in fossil fuel-derived polyethylene terephthalate produced using fossil fuel-derived ethylene glycol and fossil fuel-derived dicarboxylic acid is 0%, and the biomass content of fossil fuel-derived polyethylene terephthalate is 0%.

[0043] Also, when expressing the "biomass content" in terms of the weight ratio of biomass-derived components, the "biomass content" can be determined as follows. For example, taking polyethylene terephthalate 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 as described above. Therefore, when only biomass-derived ethylene glycol is used as ethylene glycol, the weight ratio of biomass-derived components in the polyester is about 30%, and the biomass content is about 30%. Also, the weight ratio of biomass-derived components in polyester derived from fossil fuels produced using fossil fuel-derived ethylene glycol and dicarboxylic acid derived from fossil fuels is 0%, and the biomass content of polyester derived from fossil fuels is 0%. Hereinafter, unless otherwise specified, the "biomass content" shall refer to the weight ratio of biomass-derived components.

[0044] When the base film 22 contains biomass-derived components, the biomass content in the base film 22 is 5% or more, preferably 10% or more and 30% or less, and more preferably 15% or more and 25% or less. If the biomass content in the base film 22 is 5% or more, the amount of polyester derived from fossil fuels can be reduced compared to the prior art, and the environmental load can be reduced.

[0045] 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 via ethylene oxide from biomass ethanol by a conventionally known method or the like. Also, commercially available biomass ethylene glycol may be used. For example, biomass ethylene glycol commercially available from Indiaglycol Co., Ltd. can be preferably used.

[0046] The dicarboxylic acid units of the biomass polyester use dicarboxylic acids derived from fossil fuels. As the dicarboxylic acid, aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and their derivatives can be used without limitation. Examples of the aromatic dicarboxylic acid include terephthalic acid and isophthalic acid, and examples of the derivative of the aromatic dicarboxylic acid include lower alkyl esters of the aromatic dicarboxylic acid, specifically, methyl ester, ethyl ester, propyl ester, butyl ester, and the like. Among these, terephthalic acid is preferred, and as the derivative of the aromatic dicarboxylic acid, dimethyl terephthalate is preferred.

[0047] Specific examples of the aliphatic dicarboxylic acid include chain or alicyclic dicarboxylic acids having usually 2 to 40 carbon atoms such as oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, and cyclohexanedicarboxylic acid. Further, as derivatives of the aliphatic dicarboxylic acid, lower alkyl esters such as methyl ester, ethyl ester, propyl ester, and butyl ester of the above aliphatic dicarboxylic acid, and cyclic acid anhydrides of the above aliphatic dicarboxylic acid such as succinic anhydride can be mentioned. Among these, adipic acid, succinic acid, dimer acid, or a mixture thereof is preferred, and those having succinic acid as a main component are particularly preferred. As derivatives of the aliphatic dicarboxylic acid, methyl esters of adipic acid and succinic acid, or a mixture thereof are more preferred. These dicarboxylic acids can be used alone or in combination of two or more.

[0048] The biomass polyester may be a copolymerized polyester obtained by adding a copolymerization component as a third component in addition to the above diol component and dicarboxylic acid component. Specific examples of the copolymerization component include at least one polyfunctional compound selected from the group consisting of bifunctional oxycarboxylic acids, polyhydric alcohols having three or more functional groups, polyvalent carboxylic acids having three or more functional groups and / or their anhydrides, and oxycarboxylic acids having three or more functional groups for forming a crosslinked structure. Among these copolymerization components, bifunctional and / or oxycarboxylic acids having three or more functional groups are particularly preferably used because a copolymerized polyester having a high degree of polymerization can be easily produced. Among them, the use of oxycarboxylic acids having three or more functional groups is most preferable because a polyester having a high degree of polymerization can be easily produced in a very small amount without using a chain extender described later.

[0049] The biomass polyester can be obtained by a conventionally known method of polycondensing the above-described diol unit and dicarboxylic acid unit. Specifically, it can be produced by a general method of melt polymerization such as performing an esterification reaction and / or transesterification reaction of the above dicarboxylic acid component and diol component and then performing a polycondensation reaction under reduced pressure, or by a known solution heat dehydration condensation method using an organic solvent. The amount of the diol used in producing the biomass polyester is substantially equimolar with respect to 100 moles of the dicarboxylic acid or its derivative. Generally, however, due to distillation during the esterification and / or transesterification reaction and / or polycondensation reaction, it is preferable to use an excess amount in the range of 0.1 mol% or more and 20 mol% or less.

[0050] Using a resin composition of a biomass polyester or a resin composition containing a biomass polyester and a polyester derived from fossil fuel, for example, the base film 22 can be formed by film formation using the T-die method. Specifically, after drying the above-described resin composition, it is supplied to a melt extruder heated to a temperature of Tm or higher and Tm + 70 °C, where Tm is the melting point of the resin composition, to melt the resin composition. Then, it is extruded in a sheet shape from a die such as a T-die, and the extruded sheet-like material is rapidly cooled and solidified by a rotating cooling drum or the like 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 according to the purpose.

[0051] Biomass polyethylene is a monomer polymer containing ethylene derived from biomass. Details of biomass polyethylene will be described in the section regarding the sealant layer 40.

[0052] When the base film 22 is formed of a material that does not contain biomass-derived components, as the base film 22, for example, polyester films such as polyethylene terephthalate film and polybutylene terephthalate, polyolefin films such as polyethylene film and polypropylene film, polyamide films such as nylon film and nylon 6 / meta-xylylenediamine nylon 6 coextruded and co-stretched film, or polypropylene / ethylene-vinyl alcohol copolymer coextruded and co-stretched film, or a plastic film such as a composite film obtained by laminating two or more of these films can be used. Note that the plastic film may be coated with polyvinyl alcohol or the like.

[0053] 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 a predetermined one direction, or may be a biaxially stretched film stretched in a predetermined two directions. The stretched plastic film can be obtained, for example, by heating a plastic film extruded onto a cooling drum by roll heating, infrared heating, etc. and stretching it in the longitudinal direction. This stretching is preferably performed by utilizing the peripheral speed difference of two or more rolls. The longitudinal stretching is usually performed in a temperature range of 50°C or higher and 100°C or lower. Also, the stretching ratio in the longitudinal direction, although depending on the required characteristics of the film application, is preferably 2.5 times or more and 4.2 times or less. When the stretching ratio is less than 2.5 times, the film thickness unevenness becomes large and it is difficult to obtain a good film.

[0054] The longitudinally stretched film is subsequently subjected to the treatment steps of transverse stretching, heat setting, and heat relaxation in sequence to become a biaxially stretched film. The transverse stretching is usually performed in a temperature range of 50°C or higher and 100°C or lower. The stretching ratio in the transverse direction, although depending on the required characteristics of this application, is preferably 2.5 times or more and 5.0 times or less. When it is less than 2.5 times, the film thickness unevenness becomes large and it is difficult to obtain a good film, and when it exceeds 5.0 times, breakage is likely to occur during film formation.

[0055] The breaking strength of the film of the base film 22 is, for example, 5 kg / mm or more and 40 kg / mm or less in the MD direction, 2 5 kg / mm or more and 35 kg / mm or less in the TD direction. 2 Also, the elongation at break is, for example, 50% or more and 350% or less in the MD direction, and 50% or more and 300% or less in the TD direction. Further, the shrinkage rate when left for 30 minutes in a temperature environment of 150°C is, for example, 0.1% or more and 5% or less. 2 5 kg / mm or more and 35 kg / mm or less in the TD direction. 2 Also, the elongation at break is, for example, 50% or more and 350% or less in the MD direction, and 50% or more and 300% or less in the TD direction. Further, the shrinkage rate when left for 30 minutes in a temperature environment of 150°C is, for example, 0.1% or more and 5% or less.

[0056] 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, 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, 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, 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, more preferably 30 μm or more and 60 μm or less.

[0057] The base film 22 may be a single-layer film or a coextruded film of two or more layers.

[0058] (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., other displays, and imparting aesthetic sense. The printing layer 50 includes, for example, a pattern layer that forms any desired pattern such as a picture, a photograph, characters, numbers, figures, symbols, and patterns. The printing layer may further include a background color layer formed by printing to make the pattern of the pattern layer stand out. The printing layer 50 includes a colorant and a cured product of a polyol and an isocyanate compound. The printing layer 50 may or may not contain biomass-derived components. When the printing layer 50 is formed of a material containing biomass-derived components, the printing layer 50 can be formed using a cured product in which at least one of a polyol as a main agent and an isocyanate compound as a curing agent contains biomass-derived components. When the printing layer 50 is formed of a material not containing biomass-derived components, the printing layer 50 can be formed using a polyol composed of conventionally known fossil fuel-derived components and an isocyanate compound composed of fossil fuel-derived components. 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.

[0059] [Polyester polyol] When the polyester polyol contains a biomass-derived component, at least one of the polyhydric alcohol and the polyhydric carboxylic acid contains a biomass-derived component. The following examples can be given as the polyester polyol containing a biomass-derived component. · Reaction product of a biomass-derived polyhydric alcohol and a biomass-derived polyhydric carboxylic acid · Reaction product of a fossil fuel-derived polyhydric alcohol and a biomass-derived polyhydric carboxylic acid · Reaction product of a biomass-derived polyhydric alcohol and a fossil fuel-derived polyhydric carboxylic acid

[0060] As the biomass-derived polyhydric alcohol, an aliphatic polyhydric alcohol obtained from plant raw materials such as corn, sugarcane, cassava, and coconut can be used. Examples of the biomass-derived aliphatic polyhydric alcohol include polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, etc., which are obtained from plant raw materials by the following methods, and any of them can be used. These may be used alone or in combination.

[0061] The biomass-derived polypropylene glycol is produced from glycerol via 3-hydroxypropylaldehyde (HPA) by a fermentation method in which plant raw materials are decomposed to obtain glucose. The polypropylene glycol produced by a biological method such as the above fermentation method is preferably such that useful by-products such as lactic acid can be obtained from the viewpoint of safety as compared with the polypropylene glycol produced by the EO production method, and the production cost can be kept low. The biomass-derived butylene glycol can be produced by obtaining succinic acid obtained by producing and fermenting glycol from plant raw materials and hydrogenating it. Ethylene glycol derived from biomass can be produced, for example, via ethylene from bioethanol obtained by a conventional method.

[0062] As the polyhydric alcohol derived from fossil fuels, a compound having two or more, preferably 2 to 8 hydroxyl groups in one molecule can be used. Specifically, the polyhydric alcohol derived from fossil fuels is not particularly limited and conventionally known ones can be used. For example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, and in addition, 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 can be used alone or in combination of two or more.

[0063] As the polyfunctional carboxylic acid derived from biomass, an aliphatic polyfunctional carboxylic acid obtained from plant-derived oils such as reproducible soybean oil, linseed oil, tung oil, coconut oil, palm oil, castor oil, etc., and recycled oils such as recycled waste cooking oils mainly composed of them can be used. Examples of the polyfunctional carboxylic acid derived from biomass include sebacic acid, succinic acid, phthalic acid, adipic acid, glutaric acid, dimer acid, etc. For example, sebacic acid is produced by alkali pyrolysis of ricinoleic acid obtained from castor oil, with heptyl alcohol as 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 can be used alone or in combination of two or more.

[0064] As the fossil fuel-derived polyfunctional carboxylic acid, an aliphatic polyfunctional carboxylic acid or an aromatic polyfunctional carboxylic acid can be used. The fossil fuel-derived aliphatic polyfunctional carboxylic acid is not particularly limited, and conventionally known ones 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, and their ester compounds, etc. can be mentioned. Further, as the fossil fuel-derived aromatic polyfunctional carboxylic acid, it is not particularly limited, and conventionally known ones can be used. For example, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, phthalic anhydride, trimellitic acid, and pyromellitic acid, and their ester compounds, etc. can be used. These may be used alone or in combination of two or more.

[0065] 〔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. The following examples can be given as the polyether polyol containing a biomass-derived component. · Reaction product of a biomass-derived polyfunctional alcohol and a biomass-derived polyfunctional isocyanate · Reaction product of a fossil fuel-derived polyfunctional alcohol and a biomass-derived polyfunctional isocyanate · Reaction product of a biomass-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional isocyanate

[0066] 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 in the above polyester polyol can be used.

[0067] As the biomass-derived polyfunctional isocyanate, those obtained by amidating and reducing a plant-derived dicarboxylic acid to convert it into a terminal amino group and then reacting it 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. Also, plant-derived diisocyanates can be obtained by using plant-derived amino acids as raw materials and converting their amino groups into isocyanate groups. 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. Also, 1,5-pentamethylene diisocyanate can be obtained by decarboxylating the carboxyl group of lysine and then converting the amino group into an isocyanate group.

[0068] Other synthetic methods of 1,5-pentamethylene diisocyanate include the phosgenation method and the carbamate method. More specifically, the phosgenation method synthesizes 1,5-pentamethylene diisocyanate by directly reacting 1,5-pentamethylene diamine or its salt with phosgene, or by suspending the hydrochloride salt of pentamethylene diamine in an inert solvent and reacting it with phosgene. Also, the carbamate method first carbamates 1,5-pentamethylene diamine or its salt to produce pentamethylene dicarbamate (PDC), and then synthesizes 1,5-pentamethylene diisocyanate by thermal decomposition. In the present invention, the polyisocyanate preferably used includes 1,5-pentamethylene diisocyanate-based polyisocyanate (trade name: Stabio (registered trademark)) manufactured by Mitsui Chemicals, Inc.

[0069] As the fossil fuel-derived polyfunctional isocyanate, those conventionally known and not particularly limited 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), durylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, 4,4'-diisocyanate dibenzyl, etc. can be mentioned. Further, aliphatic diisocyanates such as methylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,10-decamethylene diisocyanate; alicyclic diisocyanates such as 1,4-cyclohexylene diisocyanate, 4,4-methylenebis(cyclohexyl isocyanate), 1,5-tetrahydronaphthalene diisocyanate, isophorone diisocyanate, hydrogenated MDI, hydrogenated XDI, etc. can also be mentioned. These may be used alone or in combination of two or more.

[0070] 〔Colorant〕 The colorant is not particularly limited, and conventionally known pigments and dyes can be used.

[0071] When the printing layer 50 contains a biomass-derived component, the printing layer 50 preferably has a biomass degree of 5% or more, more preferably 5% or more and 50% or less, and still more preferably 10% or more and 50% or less. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be decreased.

[0072] The weight of the printing layer 50 after drying is preferably 0.1 g / m 2 or more and 10 g / m 2 or less, more preferably 1 g / m 2 or more and 5 g / m 2Hereinafter, more preferably 1 g / m 2 or more and 3 g / m 2 or less.

[0073] 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.

[0074] (Adhesive layer) The adhesive layer 30 is a layer that functions to bond the printing layer 50 and the sealant layer 40 that constitute the packaging material 10. Further, when a barrier layer 60 such as a vapor 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 printing layer 50 and the barrier layer 60. The adhesive layer 30 contains a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component.

[0075] In the adhesive layer 30, as the isocyanate compound containing a biomass-derived component, the same isocyanate compound containing a biomass-derived component as in the above-described printing layer 50 can be used. Further, in the adhesive layer 30, as the polyol containing a biomass-derived component, the same polyol as in the above-described printing layer 50 can be used. When both the printing layer 50 and the adhesive layer 30 are formed using a cured product containing a biomass-derived component, the cured product in the printing layer 50 and the cured product in the adhesive layer 30 may have the same composition or different compositions.

[0076] The adhesive layer preferably has a biomass content of 5% or more, more preferably 5% or more and 50% or less, and even more preferably 30% or more and 50% or less. If the biomass content is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be decreased.

[0077] The weight of the adhesive layer after drying is preferably 0.1 g / m 2 or more and 10 g / m 2 or less, more preferably 1 g / m 2 or more and 6 g / m 2Hereinafter, more preferably, it is 2 g / m 2 or more and 5 g / m 2 or less.

[0078] 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.

[0079] (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 contain a biomass-derived component or may not contain a biomass-derived component. When the sealant layer 40 is formed of a material containing a biomass-derived component, the sealant layer 40 can be formed using the following biomass polyolefin. When the sealant layer 40 is formed of a material not containing a biomass-derived component, the sealant layer 40 can be formed using a conventionally known thermoplastic resin derived from fossil fuels.

[0080] The biomass polyolefin is a polymer of a monomer containing an olefin such as ethylene derived from biomass. Since an olefin derived from biomass is used as the monomer as the raw material, the resulting polyolefin is derived from biomass. Note that the raw material monomer of the polyolefin does not have to contain 100% by mass of the olefin derived from biomass.

[0081] For example, ethylene derived from biomass can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use fermented ethanol derived from biomass obtained from plant raw materials. The plant raw materials are not particularly limited, and conventionally known plants can be used. For example, corn, sugarcane, beet, and cassava can be mentioned.

[0082] Fermentation ethanol derived from biomass refers to ethanol that is produced by contacting a culture solution containing a carbon source obtained from plant raw materials with a microorganism that produces ethanol or a product derived from the crushed material thereof, and after production, the purified ethanol. For the purification of ethanol from the culture solution, conventionally known methods such as distillation, membrane separation, and extraction can be applied. For example, methods such as adding benzene, cyclohexane, etc. and azeotroping, or removing water by membrane separation, etc. can be mentioned.

[0083] The monomer that is the raw material of biomass polyolefin may further contain a monomer of ethylene derived from fossil fuel and / or a monomer of α-olefin derived from fossil fuel, or may further contain a monomer of α-olefin derived from biomass.

[0084] The above-mentioned α-olefin is not particularly limited in terms of the number of carbon atoms, but usually, those having 3 to 20 carbon atoms can be used, and it is preferably butylene, hexene, or octene. This is because if it is butylene, hexene, or octene, it can be produced by the polymerization of ethylene which is a biomass-derived raw material. Further, by including such an α-olefin, the polyolefin obtained by polymerization has an alkyl group as a branched structure, and thus can be made more flexible than a simple linear one.

[0085] As the biomass polyolefin, polyethylene or a copolymer of ethylene and α-olefin may be used alone, or two or more kinds may be mixed and used. In particular, the biomass polyolefin is preferably polyethylene. This is because by using ethylene which is a biomass-derived raw material, it is theoretically possible to produce it entirely from biomass-derived components.

[0086] The biomass polyolefin may contain two or more kinds of biomass polyolefins having different biomass degrees, and as long as the biomass degree of the entire polyolefin resin layer is within the range described later.

[0087] The biomass polyolefin preferably has a density of 0.91 g / cm 3 or more and 0.93 g / cm 3 or less, more preferably 0.912 g / cm 3 or more and 0.928 g / cm 3 or less, even more preferably 0.915 g / cm 3 or more and 0.925 g / cm 3 or less. The density of the biomass polyolefin is a value measured according to the method specified in Method A of JIS K7112-1980 after annealing as described in JIS K6760-1995. If the density of the biomass polyolefin is 0.91 g / cm 3 or more, the rigidity of the polyolefin resin layer containing the biomass polyolefin can be increased, and it can be suitably used as the inner layer of a packaging product. Also, if the density of the biomass polyolefin is 0.93 g / cm 3 or less, the transparency and mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be increased, and it can be suitably used as the inner layer of a packaging product.

[0088] The biomass polyolefin has a melt flow rate (MFR) of 0.1 g / 10 min or more and 10 g / 10 min or less, preferably 0.2 g / 10 min or more and 9 g / 10 min or less, more preferably 1 g / 10 min or more and 8.5 g / 10 min or less. The melt flow rate is a value measured by Method A 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. Also, 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.

[0089] Suitably used biomass polyolefins include biomass-derived low-density polyethylene (trade name: SBC818, density: 0.918 g / cm 3, MFR: 8.1 g / 10 min, biomass content 95%), low-density polyethylene derived from biomass manufactured by Braskem (product name: SPB681, density: 0.922 g / cm 3 , MFR: 3.8 g / 10 min, biomass content 95%), linear low-density polyethylene derived from biomass manufactured by Braskem (product name: SLL118, density: 0.916 g / cm 3 , MFR: 1.0 g / 10 min, biomass content 87%) and the like.

[0090] Examples of the above-mentioned thermoplastic resins 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, or ionomer.

[0091] The sealant layer may be formed by dry laminating a sealant film to the printing layer on the substrate layer side via an adhesive layer, or by extruding the above-mentioned thermoplastic resin onto the adhesive layer side by the melt extrusion lamination method to form a film to form the sealant layer. When the melt extrusion lamination method is adopted, an anchor coat layer formed by applying and drying an anchor coat agent on the surface of the adhesive layer may be provided. Examples of the anchor coat agent include any resin having a heat resistance temperature of 135°C or higher, such as a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, a polyethyleneimine, etc. 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. Also, a silane coupling agent may be used in combination as an additive, and nitrocellulose may be used in combination to enhance heat resistance.

[0092] The dried anchor coat layer 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 dried adhesive layer 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 preferably has a thickness of 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

[0093] The sealant layer 40 preferably has a biomass degree of 5% or more, more preferably 5% or more and 60% or less, and even more preferably 10% or more and 60% or less. 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. The above biomass degree is a value indicated by a weight ratio, but it can also be shown as a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement. That is, by measuring the ratio of C14 contained in all carbon atoms in the sealant layer, the ratio of carbon derived from biomass can be calculated. The content of C14 in the sealant layer is P C14 When it is set as, the content P bio of carbon derived from biomass is, as described above, the following formula P bio (%) = P C14 / 105.5 × 100 can be obtained by. Note that the biomass degree of polyethylene produced using ethylene, which is a raw material derived from biomass, is the same value whether expressed as a weight ratio or as a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement.

[0094] The sealant layer 40 may be a single layer or a multilayer. When using the above-described biomass polyolefin for the sealant layer, it may be a sealant layer having three layers: an inner layer, an intermediate layer, and an outer layer. In that case, it is preferable that the intermediate layer is a biomass polyolefin or a mixture of a biomass polyolefin and a conventionally known polyolefin derived from fossil fuel, and the inner and outer layers are conventionally known polyolefins derived from fossil fuel.

[0095] The sealant layer 40 preferably has a thickness of 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.

[0096] (Barrier layer) Layers other than the above, such as a barrier layer, may be provided between the base material layer and the printing layer and / or between the adhesive layer and the sealant layer. As the barrier layer, a metal foil or a vapor deposition layer of an inorganic or inorganic oxide can be preferably used.

[0097] (Metal foil) As the metal foil constituting the barrier layer, a conventionally known metal foil can be used. From the viewpoint of gas barrier properties that prevent permeation of oxygen gas, water vapor, etc., and light shielding properties that prevent permeation of visible light, ultraviolet rays, etc., aluminum foil is preferable. In addition, since a metallic luster can be imparted to the packaging bag, the design can be improved. The thickness of the metal foil is, for example, 5 μm or more and 15 μm or less.

[0098] (Vapor deposition layer) The vapor deposition layer 60 is a vapor deposition film made of an inorganic substance and / or an inorganic oxide. The vapor deposition film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and its composition and formation method are not particularly limited. The packaging material 10 may have two or more vapor deposition layers 60. When having two or more vapor deposition layers 60, each may have the same composition or different compositions.

[0099] As the vapor deposition layer 60, for example, a vapor deposition film of an inorganic substance or 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), yttrium (Y), etc. can be used.

[0100] The vapor deposition film of inorganic oxides such as silicon oxide and aluminum oxide has transparency. When the vapor deposition layer 60 is located on the outer surface 10y side of the printing layer 50, the vapor deposition film of inorganic oxide with transparency is used as the vapor deposition layer 60.

[0101] The notation of inorganic oxide is, for example, SiO X , AlO X and so on like MO X (However, in the formula, M represents an inorganic element, and the value of X varies depending on the inorganic element.) It is represented by. As the range of the value of X, for silicon (Si), it is 0 to 2, for aluminum (Al), it is 0 to 1.5, for magnesium (Mg), it is 0 to 1, for calcium (Ca), it is 0 to 1, for potassium (K), it is 0 to 0.5, for tin (Sn), it is 0 to 2, for sodium (Na), it is 0 to 0.5, for boron (B), it is 0 to 1.5, for titanium (Ti), it is 0 to 2, for lead (Pb), it is 0 to 1, for zirconium (Zr), it can take values in the range of 0 to 2, and for yttrium (Y), it can take values in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance) and is not transparent. Also, the upper limit of the range of X is the value of complete oxidation. As the vapor deposition layer 60 of the packaging material 10, silicon (Si) and aluminum (Al) are preferably used, and those with values in the range of 1.0 to 2.0 for silicon (Si) and 0.5 to 1.5 for aluminum (Al) can be used.

[0102] The film thickness of the vapor deposition film of the above-mentioned inorganic substance or inorganic oxide varies depending on the type of the inorganic substance or inorganic oxide used, etc. For example, it is preferably arbitrarily selected and formed within the range of 50 Å or more and 2000 Å or less, more preferably 100 Å or more and 1000 Å or less. More specifically, in the case of the vapor deposition film of aluminum, a film thickness of 50 Å or more and 600 Å or less, and more preferably 100 Å or more and 450 Å or less is desirable. Also, in the case of the vapor deposition film of aluminum oxide or silicon oxide, a film thickness of 50 Å or more and 500 Å or less, and more preferably 100 Å or more and 300 Å or less is desirable.

[0103] The vapor deposition layer 60 can be formed on the substrate layer 20, the sealant layer 40, etc. using the following formation methods. As the formation method of the vapor deposition layer 60, for example, physical vapor deposition methods such as vacuum vapor deposition method, sputtering method, and ion plating method (Physical Vapor Deposition method, PVD method), or chemical vapor deposition methods such as plasma chemical vapor deposition method, thermal chemical vapor deposition method, and photo chemical vapor deposition method (Chemical Vapor Deposition method, CVD method), etc. can be mentioned.

[0104] (Gas barrier coating film) The gas barrier coating film is a film provided on the vapor deposition layer as needed. The gas barrier coating film functions as a layer that suppresses the permeation of oxygen gas, water vapor, etc. The gas barrier coating film has the general formula R 1 n M(OR 2 ) m (However, 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 valence of M.) It contains at least one or more alkoxides represented by the above formula, and a polyvinyl alcohol-based resin and / or an ethylene-vinyl alcohol copolymer as described above, and further, in the presence of a sol-gel method catalyst, an acid, water, and an organic solvent, it is obtained from a gas barrier composition that undergoes polycondensation by the sol-gel method.

[0105] As the alkoxide represented by the above general formula R 1 n M(OR 2 ) m , at least one or more of a partial hydrolyzate of the alkoxide and a condensate of the hydrolysis of the alkoxide can be used. Further, as the partial hydrolyzate of the above alkoxide, it is not necessary for all of the alkoxy groups to be hydrolyzed, and those in which one or more are hydrolyzed, and mixtures thereof may also be used. As the condensate of the hydrolysis of the alkoxide, those having a dimer or more of the partial hydrolyzed alkoxide, specifically, those having 2 to 6 monomers are used.

[0106] In the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by, as the metal atom represented by M, silicon, zirconium, titanium, aluminum, and others can be used. In the present embodiment, preferred metals include, for example, silicon, titanium, and the like. Also, in the present invention, as a method of using the alkoxide, it can also be used alone or by mixing alkoxides of two or more different metal atoms in the same solution.

[0107] Also, in the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by, specific examples of the organic group represented by R 1 include, for example, alkyl groups such as methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, t-butyl group, n-hexyl group, n-octyl group, and others. Also, in the above general formula R 1 n M(OR 2 ) m In the alkoxide represented by, specific examples of the organic group represented by R 2 include, for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, and others. Note that these alkyl groups in the same molecule may be the same or different.

[0108] When preparing the above gas barrier composition, for example, a silane coupling agent or the like may be added. As the above silane coupling agent, a known organoalkoxysilane containing an organic reactive group can be used. In the present embodiment, in particular, an organoalkoxysilane having an epoxy group is preferably used. Specifically, for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane can be used. Such a silane coupling agent may be used alone or in a mixture of two or more.

[0109] <Method for manufacturing a packaging material> Next, an example of a method for manufacturing the laminate constituting the packaging material 10 will be described.

[0110] First, the above-mentioned base material layer 20 is prepared. The base material layer 20 is provided with a printing layer 50 in advance. Further, the base material layer 20 may include a barrier layer 60 such as a vapor deposition layer or a gas barrier coating film as necessary.

[0111] Subsequently, by the dry lamination method, the printing layer 50 side of the base material layer 20 and the sealant layer 40 are laminated via an adhesive layer 30. Thereby, the packaging material 10 including the base material layer 20, the printing layer 50, the adhesive layer 30, and the sealant layer 40 can be obtained.

[0112] In the dry lamination method, first, an adhesive composition is applied to one of the two films to be laminated. Subsequently, the applied adhesive composition is dried to volatilize the solvent. Then, the two films are laminated via the dried adhesive composition. Subsequently, in a state where the two laminated films are wound up, aging is performed for 24 hours or more in an environment of 20°C or higher, for example.

[0113] The packaging material 10 can also 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, biocompatibility, and the like. Examples of secondary processing include embossing, painting, adhesion, printing, metallizing (such as plating), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, coating, etc.). Further, a molded product can also be manufactured by subjecting the packaging material according to the present invention to lamination processing (dry lamination or extrusion lamination), bag-making processing, and other post-treatment processing.

[0114] <Packaging product> 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.

[0115] A packaged product with packaging materials can be suitably used as packaging for various food and beverage products such as food and drink, fruit juice, juice, drinking water, liquor, cooked food, fish paste products, frozen food, meat products, stews, mochi, liquid soups for hot pots, seasonings, etc., cosmetics such as liquid detergents, shampoos, rinses, conditioners, sanitary products, daily necessities, and finished products. Specific examples of food and beverage products include coffee, coffee beans, coffee powder, ice cream, gummies, side dishes, pasta sauce, curry, jelly, bacon, chocolate, chocolate paste, etc. Specific examples of daily necessities include absorbent cotton, masks, bath salts, powdered milk, etc. Also, as exemplified in the embodiments described later, a packaged product provided with a packaging material 10 configured to have heat resistance can be used in applications for containing contents subjected to heat sterilization treatments such as retort treatment and boiling treatment. Note that the retort treatment is a process of heating the packaged product under pressure using steam or heated warm water after filling the contents into the packaged product and sealing the packaged product. The temperature of the retort treatment is, for example, 120°C or higher. The boiling treatment is a process of simmering the packaged product under atmospheric pressure after filling the contents into the packaged product and sealing the packaged product. The temperature of the boiling treatment is, for example, 90°C or higher and 100°C or lower.

[0116] The packaging bag of the packaging product can be made by folding the packaging material 10 in half, or by preparing two pieces of the packaging material 10, facing the sealant layer 40 of the front packaging material 10 and the sealant layer 40 of the back packaging material 10 and overlapping them, and then heat-sealing the peripheral ends thereof, for example, by heat-sealing in a side seal type, two-side seal type, three-side seal type, four-side seal type, envelope sticker seal type, palm sticker seal type (pillow seal type), pleated seal type, flat bottom seal type, corner bottom seal type, etc., to manufacture various forms of packaging bags. Also, heat-sealing can be performed with a folded packaging material 10 inserted between the front packaging material 10 and the back packaging material 10 to manufacture a gusset-type packaging bag. Note that not all of the packaging materials 10 constituting the packaging bag need to be the packaging material 10 according to the present invention. That is, at least a part of the packaging material 10 constituting the packaging bag may be a packaging material 10 having an adhesive layer containing a biomass-derived component, and the other part of the packaging material 10 constituting the packaging bag may be a packaging material 10 having an adhesive layer derived from fossil fuel.

[0117] As the heat-sealing method, for example, it can be performed by known methods such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high-frequency sealing, ultrasonic sealing, etc.

[0118] FIG. 5 is a diagram showing an example of a packaging bag 70 including the packaging material 10. The bag 70 includes a front film 74 constituting the front surface, a back film 75 constituting the back surface, and a bottom film 76 constituting the bottom portion 72. The bottom film 76 is disposed between the front film 74 and the back film 75 in a state of being folded at the folding portion 76f. Thus, the packaging bag 70 shown in FIG. 5 is a self-standing standing pouch having a bottom configured as a gusset portion.

[0119] The front film 74, the back film 75, and the bottom film 76 have their inner surfaces 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 bottom seal portion 72a extending to the bottom 72 and a pair of side seal portions 73a extending along the pair of side portions 73. In the packaging bag 70 in the state before the contents are filled (the state where 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 accommodated in the packaging bag 70, the upper seal portion is formed by joining the inner surface of the front film 74 and the inner surface of the back film 75 at the upper portion 71, and the packaging bag 70 is sealed.

[0120] Note that the above terms “front film”, “back film”, and “bottom film” merely demarcate each film according to the positional relationship, and the method of providing the packaging material 10 when manufacturing the packaging bag 70 is not limited by the above terms. For example, the packaging bag 70 may be manufactured using a single packaging material 10 in which the front film 74, the back film 75, and the bottom film 76 are connected in series, or may be manufactured using a total of two packaging materials 10, namely, a single packaging material 10 in which the front film 74 and the bottom film 76 are connected in series and a single back film 75, or may be manufactured using a total of three packaging materials 10, namely, a single front film 74, a single back film 75, and a single bottom film 76.

[0121] At least one of the front film 74, the back film 75, and the bottom film 76 is constituted by a packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared with the prior art, and the environmental load can be reduced.

[0122] FIG. 6 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 6 is different only in that it further includes a steam venting mechanism 80, and other configurations are substantially the same as those of the packaging bag 70 shown in FIG. 5. In the packaging bag 70 shown in FIG. 6, the same parts as those of the packaging bag 70 shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

[0123] As shown in FIG. 6, the packaging bag 70 includes a steam venting mechanism 80 for discharging steam generated when heating the contents accommodated in the accommodating portion 77 to the outside. The steam venting mechanism 80 is configured to communicate the inside and the outside of the packaging bag 70 to discharge the steam when the pressure of the steam becomes equal to or higher than a predetermined value, and to suppress steam leakage from locations other than the steam venting mechanism 80.

[0124] In the example shown in FIG. 6, the steam venting mechanism 80 includes a steam venting seal portion 81 protruding from the side seal portion 73a toward the inside of the packaging bag 70, and an unsealed portion 82 isolated from the accommodating portion 77 by the steam venting seal portion 81. The unsealed portion 82 communicates with the outside of the packaging bag 70. When the pressure in the accommodating portion 77 increases due to heating by a microwave oven or the like, the steam venting seal portion 81 peels off. The steam in the accommodating portion 77 can escape to the outside of the packaging bag 70 through the peeled portion of the steam venting seal portion 81 and the unsealed portion 82.

[0125] Note that the configuration of the steam venting mechanism 80 is not limited to the configuration shown in FIG. 6. The configuration of the steam venting mechanism 80 is arbitrary as long as the accommodating portion 77 and the outside of the packaging bag 70 can be communicated when the pressure of the steam becomes equal to or higher than a predetermined value.

[0126] Also in the packaging bag 70 shown in FIG. 6, at least one of the surface film 74, the back film 75, and the lower film 76 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared with the conventional case, and the environmental load can be reduced.

[0127] FIG. 7 is a view showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 7 is different only in that it further includes a spout portion 85, and other configurations are substantially the same as those of the packaging bag 70 shown in FIG. 5. In the packaging bag 70 shown in FIG. 7, the same reference numerals are given to the same parts as those of the packaging bag 70 shown in FIG. 5, and detailed description thereof is omitted.

[0128] As shown in FIG. 7, the spout portion 85 is a portion through which the contents pass when the contents stored in the storage portion 77 are taken out. In this case, the contents are a liquid having fluidity or the like. The width of the spout portion 85 is narrower than the width of the storage portion 77. For this reason, the user can accurately determine the pouring direction of the contents poured out from the packaging bag 70 through the spout portion 85.

[0129] In the example shown in FIG. 7, the spout portion 85 is constituted 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 so as to define a spout portion 85 having a width narrower than that of the storage portion 77. The packaging bag 70 including such a spout portion 85 is preferably used as a refill pouch for storing contents such as detergents, shampoos, and rinses that are to be refilled into bottles.

[0130] Note that as long as the contents can be poured out appropriately, the configuration of the spout portion 85 is not limited to the configuration shown in FIG. 7. For example, the spout portion 85 may be a member different from the front film 74 and the back film 75, such as a spout.

[0131] Also in the packaging bag 70 shown in FIG. 7, at least one of the front film 74, the back film 75, and the bottom film 76 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared to the conventional case, and the environmental load can be reduced.

[0132] FIG. 8 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 8 is a four-side seal pouch formed by joining a front film 74 and a back film 75 along the outer edge on four sides. In addition, in the upper part 71, similar to the case of the examples shown in FIGS. 5 to 7, after the contents are stored in the packaging bag 70 through the opening 71b, an upper seal part is formed.

[0133] Also in the packaging bag 70 shown in FIG. 8, at least one of the front film 74 and the back film 75 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared with the conventional case, and the environmental load can be reduced.

[0134] Although not shown, the packaging bag 70 may be a three-side seal pouch formed by joining the front film 74 and the back film 75 along the outer edge on three sides. Also, although not shown, the packaging bag 70 may be a pillow pouch joined at the upper part 71, the lower part 72, and the gusset part.

[0135] FIG. 9 is a diagram showing an example of the container 90 with a lid including the packaging material 10. The container 90 with a lid includes a container body 92 produced by sheet forming such as drawing, and a lid part 94 joined to the container body 92.

[0136] In the example shown in FIG. 9, for example, the container body 92 is produced by drawing the packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared with the conventional case, and the environmental load can be reduced.

[0137] Also, in the example shown in FIG. 9, the lid part 94 may be formed of the packaging material 10 having an adhesive layer containing a biomass-derived component. Thereby, the amount of fossil fuel used can be reduced compared with the conventional case, and the environmental load can be reduced.

[0138] <Other aspects> According to another aspect of the present invention, there is provided a packaging material including at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer, the adhesive layer contains a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component. In the packaging material according to another aspect of the present invention, the polyol of the adhesive 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 or the polyfunctional carboxylic acid of the adhesive layer may contain a biomass-derived component. In the packaging material according to another aspect of 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. In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol or the polyfunctional isocyanate of the adhesive layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the isocyanate compound of the adhesive layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the printing layer contains a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the polyol of the printing 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 or the polyfunctional carboxylic acid of the printing layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the polyol in the printing 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 or the polyfunctional isocyanate in the printing layer may contain a biomass-derived component. In the packaging material according to another aspect of the present invention, the base material layer may have a base material film containing polyester, polyamide or polyolefin. In the packaging material according to another aspect of the present invention, the base material film may contain a biomass polyester having ethylene glycol derived from biomass as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. In the packaging material according to another aspect of the present invention, the sealant layer may contain a polyolefin which is a polymer of a monomer containing an 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. According to another aspect of the present invention, a packaging product comprising the packaging material described above is provided.

Examples

[0139] 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 the gist thereof is not exceeded.

[0140] [Example 1A] As the base material film 22 of the base material layer 20, a biaxially stretched PET film (thickness: 12 μm) derived from fossil fuel was prepared. Subsequently, a printing layer 50 was formed on the inner surface side of the PET film using an ink derived from fossil fuel, which contained a cured product of a main agent containing a polyester polyol derived from fossil fuel and a curing agent containing an isocyanate compound derived from fossil fuel, and to which a colorant was further added.

[0141] Further, as the sealant film 42 of the sealant layer 40, the polyethylene film 1 produced as follows was used. First, 90 parts by mass of linear low-density polyethylene derived from fossil fuel (density: 0.918 g / cm 3 , MFR: 3.8 g / 10 min, biomass content: 0%) and 10 parts by mass of low-density polyethylene derived from fossil fuel (density: 0.924 g / cm 3 , MFR: 2.0 g / 10 min, biomass content: 0%) were melt-kneaded to obtain a resin composition. Next, the obtained resin composition was formed into a film by an upward blown air-cooled inflation coextrusion film forming machine to obtain a single-layer polyethylene film for the sealant layer (biomass content: 0%). The polyethylene film thus produced is also referred to as polyethylene film 1. The thickness of the polyethylene film 1 was 30 μm. Subsequently, the base film 22 on which the printing layer 50 was formed and the sealant film 42 were laminated by the dry lamination method using the adhesive layer 30 containing biomass-derived components to obtain the packaging material 10. The adhesive layer 30 has a cured product of a polyether polyol (main agent) obtained by reacting a polyfunctional alcohol containing biomass-derived components with a polyfunctional isocyanate derived from fossil fuel and an isocyanate compound derived from fossil fuel (curing agent).

[0142] The layer structure of the packaging material 10 of this example is expressed as follows. PET12 / Print / Bio Adhesion / PE(1)30 “ / ” represents the boundary between layers. The leftmost layer is the layer constituting the outer surface of the packaging material 10, and the rightmost layer is the layer constituting the inner surface of the packaging material 10. “PET” means a biaxially stretched PET film derived from fossil fuel. “Print” means a printing layer derived from fossil fuel. “Bio Adhesion” means an adhesive layer derived from biomass. “PE(1)” means the above-mentioned polyethylene film 1. The numbers mean the thickness of the layer (unit: μm).

[0143] [Example 1B] A packaging material 10 was produced in the same manner as in Example 1A, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional isocyanate containing a biomass-derived component was used as the polyether polyol which is the main ingredient of the adhesive layer 30.

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

[0145] In Examples 1A to 1C, an example was shown in which one of the three components, namely, the polyfunctional alcohol or polyfunctional isocyanate used in the polyether polyol as the main ingredient in the adhesive layer, or the isocyanate compound used as the curing agent, is a biomass-derived component. However, the present invention is not limited thereto. 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.

[0146] [Example 1D] A packaging material 10 was produced in the same manner as in Example 1A, except that a printing layer 50 containing a biomass-derived component was used. Specifically, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a polyfunctional isocyanate derived from fossil fuel was used as the polyether polyol which is the main ingredient of the printing layer 50. In addition, an isocyanate compound derived from fossil fuel was used as the curing agent of the printing layer 50.

[0147] The layer structure of the packaging material 10 of the present example is expressed as follows. PET12 / Bio-print / Bio-adhesion / PE(1)30 "Bio-print" means a printing layer derived from biomass.

[0148] [Example 1E] A packaging material 10 was produced in the same manner as in Example 1D, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional isocyanate containing a biomass-derived component was used as the polyether polyol which is the main ingredient of the printing layer 50.

[0149] [Example 1F] A packaging material 10 was produced in the same manner as in Example 1D, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional isocyanate derived from fossil fuel was used as the polyether polyol which is the main ingredient of the printing layer 50, and an isocyanate compound containing a biomass-derived component was used as the isocyanate compound which is the curing agent of the printing layer 50.

[0150] [Example 1G] A packaging material 10 was produced in the same manner as in Example 1A, except that a printing layer 50 containing a biomass-derived component was used. Specifically, a polyester polyol which is a reaction product of a polyfunctional alcohol containing a biomass-derived component and a polyfunctional carboxylic acid derived from fossil fuel was used as the main ingredient of the printing layer 50. Also, an isocyanate compound derived from fossil fuel was used as the curing agent of the printing layer 50.

[0151] [Example 1H] A packaging material 10 was produced in the same manner as in Example 1G, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional carboxylic acid containing a biomass-derived component was used as the polyester polyol which is the main ingredient of the printing layer 50.

[0152] [Example 1I] A packaging material 10 was produced in the same manner as in Example 1G, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional carboxylic acid derived from fossil fuel was used as the polyester polyol which is the main ingredient of the printing layer 50, and an isocyanate compound containing a biomass-derived component was used as the isocyanate compound which is the curing agent of the printing layer 50.

[0153] In Examples 1G to 1I, in the printing layer, an example was shown in which one of the three components, namely, the polyfunctional alcohol or polyfunctional carboxylic acid used as the main polyester polyol, or the isocyanate compound used as the curing agent, is a biomass-derived component. However, the present invention is not limited to this. For example, two of the three components may contain biomass-derived components, or all of the three components may contain biomass-derived components.

[0154] In Examples 1D to 1I, as the adhesive layer, in addition to the adhesive layer shown in Example 1A, the adhesive layers shown in Examples 1B to 1C may also be used.

[0155] [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.

[0156] The layer structure of the packaging material 10 of this example is expressed as follows. Bio-PET12 / Bio-print / Bio-adhesion / PE(1)30 "Bio-PET" means a PET film derived from biomass.

[0157] [Example 1K] A packaging material 10 was produced in the same manner as in Example 1G, except that a polyethylene film 2 produced as follows was used as the sealant film 42 of the sealant layer 40. The method for producing the polyethylene film 2 will be described. First, 60 parts by mass of linear low-density polyethylene derived from fossil fuel (density: 0.918 g / cm 3 , MFR: 3.8 g / 10 min, biomass content: 0%), 20 parts by mass of low-density polyethylene derived from fossil fuel (density: 0.924 g / cm 3 , MFR: 2.0 g / 10 min, biomass content: 0%), and linear low-density polyethylene derived from biomass (LLDPE, manufactured by Braskem, trade name: SLL118, density: 0.916 g / cm3 , and 20 parts by mass of MFR: 1.0 g / 10 min, biomass content 87%) were melt-kneaded to obtain a resin composition. Next, the obtained resin composition was formed into a film using an upward blowing air-cooled inflation coextrusion film forming machine to obtain a single-layer polyethylene film 2 (biomass content: 16%) for the sealant layer. The thickness of the polyethylene film 2 was 30 μm, the same as that of the polyethylene film 1 in Example 1A.

[0158] The layer structure of the packaging material 10 of this example is expressed as follows. PET12 / Bio-print / Bio-bond / PE(2)30 "PE(2)" means the above-mentioned polyethylene film 2.

[0159] [Example 1L] As the base film 22, a biaxially stretched PET film (thickness 12 μm) containing biomass-derived components was used, and as the sealant film 42 of the sealant layer 40, a polyethylene film containing biomass-derived components was used. Otherwise, the packaging material 10 was produced in the same manner as in Example 1G.

[0160] The layer structure of the packaging material 10 of this example is expressed as follows. Bio-PET12 / Bio-print / Bio-bond / PE(2)30

[0161] In addition, in Examples 1J to 1L, as the adhesive layer, in addition to the adhesive layer shown in Example 1A, the adhesive layers shown in Examples 1B to 1C may also be used. Also, as the printing layer, in addition to the printing layer shown in Example 1G, the printing layers shown in Examples 1A to 1I may also be used.

[0162] The layer structures of the packaging materials 10 of Examples 1A to 1L are collectively shown in Fig. 10. In the column of "Type of Adhesive Layer" in Fig. 10, the description "ether-based" means that the main agent used in the adhesive layer is polyether polyol. In addition, in the column of "biomass-derived component in the adhesive layer", the description "polyhydric alcohol" means that at least the polyhydric alcohol in the components of the main agent and the curing agent used in the adhesive layer is derived from biomass. Similarly, the description "isocyanate compound" means that at least the isocyanate compound in the components of the curing agent among the components of the main agent and the curing agent used in the adhesive layer is derived from biomass.

[0163] Similarly, in the column of "type of printing layer", the description "ether type" means that the main agent used in the printing layer is polyether polyol. Also, the description "ester type" means that the main agent used in the printing layer is polyester polyol. Further, in the column of "biomass-derived component in the printing layer", the description "polyhydric alcohol" means that at least the polyhydric alcohol in the components of the main agent and the curing agent used in the printing layer is derived from biomass. Similarly, the description "polyfunctional carboxylic acid" means that at least the polyfunctional carboxylic acid in the components of the main agent among the components of the main agent and the curing agent used in the printing layer is derived from biomass. Similarly, the description "isocyanate compound" means that at least the isocyanate compound in the components of the curing agent among the components of the main agent and the curing agent used in the printing layer is derived from biomass. Also, in the column of "biomass-derived component in the printing layer", the description "-" means that the printing layer does not contain biomass-derived components.

[0164] [Example 2A] As the base film 22 of the base material layer 20, a biaxially stretched polypropylene film (thickness 20 μm) derived from fossil fuel was prepared. Subsequently, the printing layer 50 was formed on the inner surface side of the polypropylene film using the same ink as that used in Example 1A.

[0165] Also, as the sealant film 42 of the sealant layer 40, a polyethylene film 1 with a thickness of 25 μm was prepared. Subsequently, the base material film 22 on which the printing layer 50 was formed and the sealant film 42 were laminated by the dry lamination method using the same adhesive as that used in Example 1A to obtain the packaging material 10.

[0166] The layer structure of the packaging material 10 of this example is expressed as follows. OPP20 / Print / Bio-bonded / PE(1)25 "OPP" means a biaxially stretched polypropylene film derived from fossil fuels.

[0167] [Example 2B] As the base material film 22, a polypropylene film provided with an inorganic oxide vapor deposition layer and a gas barrier coating film located on the vapor deposition layer on the surface of a biaxially stretched polypropylene film (thickness 20 μm) derived from fossil fuels was used, and the packaging material 10 was produced in the same manner as in Example 2A.

[0168] The layer structure of the packaging material 10 of this example is expressed as follows. Barrier OPP20 / Print / Bio-bonded / PE(1)25 "Barrier OPP" means a polypropylene film provided with an inorganic oxide vapor deposition layer and a gas barrier coating film on a biaxially stretched polypropylene film derived from fossil fuels.

[0169] [Example 3] As the sealant film 42, a polypropylene film (thickness 20 μm) derived from fossil fuels provided with a metal vapor deposition layer was used, and the packaging material 10 was produced in the same manner as in Example 1A.

[0170] The layer structure of the packaging material 10 of this example is expressed as follows. PET12 / Print / Bio-bonded / VMCPP20 "VMCPP" means a biaxially stretched polypropylene film derived from fossil fuels provided with a metal vapor deposition layer.

[0171] [Example 4] As the sealant film 42, a polypropylene film (thickness: 25 μm) derived from fossil fuel with a vapor deposition layer of metal provided thereon was used, and the packaging material 10 was produced in the same manner as in Example 2A except for using this polypropylene film with the vapor deposition layer.

[0172] The layer structure of the packaging material 10 of this example is expressed as follows. OPP20 / Print / Bio - adhesion / VMCPP25

[0173] [Example 5] As the sealant film 42, a polypropylene film (thickness: 20 μm) derived from fossil fuel was used, and the packaging material 10 was produced in the same manner as in Example 1A except for using this polypropylene film.

[0174] The layer structure of the packaging material 10 of this example is expressed as follows. PET12 / Print / Bio - adhesion / CPP20

[0175] [Example 6A] As the sealant film 42, a polypropylene film (thickness: 20 μm) derived from fossil fuel was used, and the packaging material 10 was produced in the same manner as in Example 2A except for using this polypropylene film.

[0176] The layer structure of the packaging material 10 of this example is expressed as follows. OPP20 / Print / Bio - adhesion / CPP20

[0177] [Example 6A] As the sealant film 42, a polypropylene film (thickness: 20 μm) derived from fossil fuel was used, and the packaging material 10 was produced in the same manner as in Example 2B except for using this polypropylene film.

[0178] The layer structure of the packaging material 10 of this example is expressed as follows. Barrier OPP20 / Print / Bio - adhesion / CPP20

[0179] [Example 7] As the sealant film 42, 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 fuel was used.

[0180] The layer structure of the packaging material 10 of this example is expressed as follows. PET20 / Printing / Bio - adhesion / CNY60 "CNY" means a nylon film derived from fossil fuel.

[0181] [Example 8] As the base film 22, a biaxially stretched PET film (thickness: 12 μm) derived from fossil fuel, which was provided with a vapor - deposited layer of inorganic oxide and a gas - barrier coating film located on the vapor - deposited layer, was used. As the sealant film 42, a polypropylene film (thickness: 25 μm) derived from fossil fuel was used. A packaging material 10 was produced in the same manner as in Example 1A, except for the above.

[0182] The layer structure of the packaging material 10 of this example is expressed as follows. IB - PET12 / Printing / Bio - adhesion / CPP25 "IB - PET" means a PET film provided with a vapor - deposited layer of inorganic oxide and a gas - barrier coating film located on the vapor - deposited layer.

[0183] [Example 9] As the sealant film 42, a polyethylene film 1 with a thickness of 40 μm was used. A packaging material 10 was produced in the same manner as in Example 8, except for the above.

[0184] The layer structure of the packaging material 10 of this example is expressed as follows. IB - PET12 / Printing / Bio - adhesion / PE(1)40

[0185] In the packaging materials of Examples 2A to 9 described so far, as the adhesive layer, the adhesive layers shown in Examples 1B to 1C may be used other than those used in Example 1A. Further, as the printing layer, other than those used in Example 1A, the same variations as in the cases of Examples 1B to 1L can be adopted.

[0186] [Example 10] As the base film 22, a biaxially stretched nylon film (thickness 15 μm) derived from fossil fuel was used, as the sealant film 42, a polyethylene film 1 with a thickness of 50 μm was used, and as the adhesive layer 30, a polyester polyol which is a reaction product of a polyfunctional alcohol containing a biomass-derived component and a polyfunctional carboxylic acid derived from fossil fuel was used as the main agent, and an isocyanate compound derived from fossil fuel was used as the curing agent. A packaging material 10 was produced in the same manner as in Example 1A except for this.

[0187] The layer structure of the packaging material 10 of this example is expressed as follows. ONY15 / Print / Bio Adh / PE(1)50 "ONY" means a biaxially stretched nylon film derived from fossil fuel.

[0188] [Example 11] As the base film 22, a biaxially stretched nylon film (thickness 15 μm) derived from fossil fuel, which is provided with a vapor deposition layer of an inorganic oxide and a gas barrier coating film located on the vapor deposition layer, was used. A packaging material 10 was produced in the same manner as in Example 10 except for this.

[0189] The layer structure of the packaging material 10 of this example is expressed as follows. IB-ONY15 / Print / Bio Adh / PE(1)50 "IB-ONY" means a biaxially stretched nylon film derived from fossil fuel, which is provided with a vapor deposition layer of an inorganic oxide and a gas barrier coating film located on the vapor deposition layer.

[0190] In Examples 10 and 11, in addition to the above, as the main agent, a polyester polyol which is a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional carboxylic acid containing a biomass-derived component may be used, and as the curing agent, an adhesive layer using an isocyanate compound derived from fossil fuel may be used. Also, as the main agent, a polyester polyol which is a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional carboxylic acid derived from fossil fuel may be used, and as the curing agent, an adhesive layer using an isocyanate compound containing a biomass-derived component may be used.

[0191] Also, as the printing layer, other than that used in Example 1A, the same variations as in the cases of Examples 1B to 1L can be adopted.

[0192] In FIG. 11, the layer configurations of the packaging materials 10 of Examples 1A, 2A to 11 and examples of the types of packaging containers are collectively shown.

Explanation of Reference Numerals

[0193] 10 Packaging material 20 Base material layer 22 Base material film 30 Adhesive layer 40 Sealing layer 42 Sealing film 50 Printing layer 60 Barrier layer

Claims

1. A packaging material comprising at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer, the adhesive layer contains a cured product of a polyol and an isocyanate compound, the polyol in the adhesive layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, the polyfunctional carboxylic acid in the adhesive layer consists only of biomass-derived components, the printing layer contains a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component, the polyol in the printing layer is a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate, the packaging material.

2. The packaging material according to claim 1, wherein the isocyanate compound in the adhesive layer contains a biomass-derived component.

3. The packaging material according to claim 1 or 2, wherein at least one of the polyfunctional alcohol or the polyfunctional isocyanate in the printing layer contains a biomass-derived component.

4. The packaging material according to any one of claims 1 to 3, wherein the substrate layer has a substrate film containing polyester, polyamide or polyolefin.

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

6. The packaging material according to any one of claims 1 to 5, wherein the sealant layer contains a polyolefin which is a polymer of a monomer containing olefin.

7. The packaging material according to claim 6, wherein the sealant layer contains a biomass polyolefin which is a polymer of a monomer containing biomass-derived ethylene.

8. A packaging product comprising the packaging material according to any one of claims 1 to 7.

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