JP7496067B2 - Packaging materials and products - Google Patents

Description

The present invention relates to a packaging material containing biomass-derived components and a packaging product equipped with the packaging material.

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

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

As for biomass-derived resins, polylactic acid (PLA), which is manufactured via lactic acid fermentation, was the first to be commercially produced; however, since its performance as a plastic differs significantly from current general-purpose plastics, including its biodegradability, there are limitations to its product applications and manufacturing methods, and it has not yet come into widespread use. Furthermore, a life cycle assessment (LCA) is being carried out on PLA, and discussions are being held on the energy consumption during PLA manufacturing and its equivalence as an alternative to general-purpose plastics.

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

Polyesters are also widely used in various industrial applications because they are inexpensive and have excellent mechanical properties, chemical stability, heat resistance, and transparency. Polyesters are obtained by polycondensation of diol units and dicarboxylic acid units. For example, polyethylene terephthalate (hereinafter sometimes abbreviated as PET) is produced by esterifying ethylene glycol and terephthalic acid as raw materials, followed by polycondensation. These raw materials are produced from petroleum, a fossil resource; for example, ethylene glycol is produced industrially from ethylene, and terephthalic acid is produced industrially from xylene.

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

JP 2011-506628 A JP 2012-96410 A

In conventional packaging materials, the printed and adhesive layers of the laminate are made from materials derived from fossil fuels, which reduces the biomass content of the entire packaging material. Therefore, there is a demand for packaging materials composed of a laminate including a base layer, a printed layer, an adhesive layer, and a sealant layer, that have a higher biomass content throughout the entire packaging material.

The present invention has been made in consideration of these points, and aims to provide a packaging product that includes packaging material with an increased biomass content.

The present invention is a packaging product comprising a packaging material, the packaging material comprising at least a base layer, a print layer, an adhesive layer, and a sealant layer, the adhesive layer being in contact with the sealant layer, the adhesive layer comprising a cured product of a polyol and an isocyanate compound, the polyol of the adhesive layer being a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate, the polyfunctional alcohol comprising neopentyl glycol derived from biomass, and the packaging product being used in applications that do not contain contents to be subjected to heat sterilization.

The present invention also relates to a packaging product comprising a packaging material, the packaging material comprising at least a base layer, a printed layer, an adhesive layer, and a sealant layer, the adhesive layer being in contact with the sealant layer, the adhesive layer comprising a cured product of a polyol and an isocyanate compound, at least one of the polyol and the isocyanate compound comprising a biomass-derived component, the printed layer comprising a colorant and a cured product of a polyol and an isocyanate compound, at least one of the polyol and the isocyanate compound comprising a biomass-derived component, the polyol of the printed layer being a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, and the packaging product is used in an application in which contents to be subjected to heat sterilization are not contained.

In the packaging product according to the present invention, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid in the printing layer may contain a biomass-derived component.

The present invention also relates to a packaging product comprising a packaging material, the packaging material comprising at least a base layer, a printed layer, an adhesive layer, and a sealant layer, the adhesive layer being in contact with the sealant layer, the adhesive layer comprising a cured product of a polyol and an isocyanate compound, at least one of the polyol and the isocyanate compound comprising a biomass-derived component, the printed layer comprising a colorant and a cured product of a polyol and an isocyanate compound, at least one of the polyol and the isocyanate compound comprising a biomass-derived component, the polyol of the printed layer being a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate, and the packaging product is used in applications that do not contain contents to be subjected to heat sterilization.

In the packaging product according to the present invention, at least one of the polyfunctional alcohol and the polyfunctional isocyanate in the printing layer may contain a biomass-derived component.

In the packaging product according to the present invention, the isocyanate compound in the adhesive layer may contain a biomass-derived component.

In the packaging product according to the present invention, the substrate layer may have a substrate film comprising polyester, polyamide or polyolefin.

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

In the packaging product according to the present invention, the sealant layer may contain a polyolefin, which is a polymer of a monomer containing an olefin.

In the packaging product according to the present invention, the sealant layer may contain biomass polyolefin, which is a polymer of monomers including ethylene derived from biomass.

The present invention makes it possible to increase the biomass content of packaging products.

FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. FIG. 1 is a schematic cross-sectional view showing an example of a packaging material according to the present invention. FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. FIG. 1 is a schematic front view showing an example of a packaged product according to the present invention. FIG. 2 is a diagram showing the layer structure of the packaging materials of Examples 1A to 1L. FIG. 2 is a diagram showing the layer structure of the packaging materials of Examples 1A and 2A to 11.

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

In the present invention, the biomass degree, as described below, of the entire laminate constituting the packaging material is preferably 3% or more, more preferably 5% to 60%, and even more preferably 10% to 60%. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced, and the environmental burden can be reduced.

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.

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 the packaging material has two or more other layers, each of the other layers may have the same composition or different compositions.

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

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

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

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

The packaging material 10 shown in FIG. 4 has a first barrier layer 61 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 provided between the adhesive layer 30 and the sealant film 42.

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

It is also possible to combine multiple layer structures of the packaging material 10 shown in Figures 1 to 4 described above as appropriate.

The layers that make up the packaging material 10 are described below.

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

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

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

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

When the value of the content of carbon derived from biomass by radiocarbon (C14) measurement is shown as the "biomass degree", the "biomass degree" can be calculated as follows. That is, since carbon dioxide in the atmosphere contains a certain proportion of C14 (105.5 pMC), it is known that the C14 content in plants that grow by absorbing carbon dioxide from the atmosphere, such as corn, is also about 105.5 pMC. It is also known that fossil fuels contain almost no C14. Therefore, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 contained in the total carbon atoms in the polyester. In the present invention, when the content of C14 in the polyester is P _C14 , the content of carbon derived from biomass P _bio can be calculated as follows.
_Pbio (%)= _Pc14 /105.5×100
In addition, pMC is an abbreviation for Percent Modern Carbon.

Taking polyethylene terephthalate, a typical polyester, as an example, polyethylene terephthalate is a polymer of ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms in a molar ratio of 1:1, so when only biomass-derived ethylene glycol is used, the biomass-derived carbon content P _bio in polyethylene terephthalate is 20%. On the other hand, the biomass-derived carbon content in fossil fuel-derived polyethylene terephthalate produced using fossil fuel-derived ethylene glycol and fossil fuel-derived dicarboxylic acid is 0%, and the biomass degree of fossil fuel-derived polyethylene terephthalate is 0%.

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

When the base film 22 contains a biomass-derived component, 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 conventional methods, thereby reducing the environmental burden.

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 converting biomass ethanol into ethylene oxide by a conventionally known method, or by other methods to produce ethylene glycol. Commercially available biomass ethylene glycol may also be used, and for example, biomass ethylene glycol available from India Glycoal Limited can be suitably used.

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

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

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

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

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

Biomass polyethylene is a monomer polymer containing ethylene derived from biomass. Details of biomass polyethylene are explained in the section regarding the sealant layer 40.

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

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

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

The base film 22 has a breaking strength of, for example, 5 kg/ ^mm2 to 40 kg/ ^mm2 in the MD direction and 5 kg/ ^mm2 to 35 kg/ ^mm2 in the TD direction, and a breaking elongation of, for example, 50% to 350% in the MD direction and 50% to 300% in the TD direction. The shrinkage percentage when left in a temperature environment of 150° C. for 30 minutes is, for example, 0.1% to 5%.

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

The substrate film 22 may be a single-layer film or a co-extruded film of two or more layers.

(Printing layer)
The printing layer 50 is a layer formed by printing for decoration, display of contents, display of expiration date, display of manufacturer, seller, etc., and for imparting aesthetics. The printing layer 50 includes a pattern layer that forms any desired pattern such as a picture, a photograph, a letter, a number, a figure, a symbol, a pattern, etc. The printing layer may further include a background color layer formed by printing to highlight the pattern of the pattern layer. The printing layer 50 includes a colorant and a cured product of a polyol and an isocyanate compound. The printing layer 50 may or may not include a biomass-derived component. When the printing layer 50 is formed from a material containing a biomass-derived component, the printing layer 50 can be formed using a cured product in which at least one of the polyol as the base agent and the isocyanate compound as the curing agent contains a biomass-derived component. In addition, when the printing layer 50 is formed from a material that does not contain a biomass-derived component, the printing layer 50 can be formed using a polyol made of a conventionally known fossil fuel-derived component and an isocyanate compound made of a fossil fuel-derived component. As the polyol, a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, or a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate can be used.

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

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

Biomass-derived polypropylene glycol is produced by a fermentation method in which glucose is obtained by decomposing plant raw materials, via 3-hydroxypropylaldehyde (HPA) from glycerol. Polypropylene glycol produced by a biomethod such as the fermentation method is preferable in that it is safer than polypropylene glycol produced by the EO production method, because useful by-products such as lactic acid can be obtained, and the production cost can be kept low.
Biomass-derived butylene glycol can be produced by producing glycol from plant raw materials, fermenting the resulting succinic acid, and then hydrogenating the resulting succinic acid.
Biomass-derived ethylene glycol can be produced, for example, from bioethanol obtained by a conventional method via ethylene.

As the polyfunctional alcohol derived from fossil fuels, a compound having two or more, preferably two to eight hydroxyl groups in one molecule can be used. Specifically, the polyfunctional alcohol derived from fossil fuels is not particularly limited and conventionally known substances can be used. For example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, triethylene glycol, dipropylene glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, glycerin, 1,9-nonanediol, 3-methyl-1,5-pentanediol, polyether polyol, polycarbonate polyol, polyolefin polyol, acrylic polyol, etc. can be used. These may be used alone or in combination of two or more.

As the biomass-derived polyfunctional carboxylic acid, aliphatic polyfunctional carboxylic acids obtained from plant raw materials such as renewable plant-derived oils such as soybean oil, linseed oil, tung oil, coconut oil, palm oil, castor oil, etc., and regenerated oils obtained by recycling waste edible oils mainly composed of these can be used. Examples of biomass-derived aliphatic polyfunctional carboxylic acids include sebacic acid, succinic acid, phthalic acid, adipic acid, glutaric acid, dimer acid, etc. For example, sebacic acid is produced by alkaline 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 may be used alone or in combination of two or more.

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

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

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

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

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

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

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

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

The weight of the printed layer 50 after drying is preferably 0.1 g/ ^m2 or more and 10 g/ ^m2 or less, more preferably 1 g/ ^m2 or more and 5 g/ ^m2 or less, and even more preferably 1 g/ ^m2 or more and 3 g/ ^m2 or less.

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.

(Adhesive Layer)
The adhesive layer 30 is a layer that functions to adhere the printed layer 50 and the sealant layer 40 that constitute the packaging material 10. Furthermore, in the case where 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 also serves to adhere the printed 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 and the isocyanate compound contains a biomass-derived component.

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

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

The weight of the adhesive layer after drying is preferably 0.1 g/ ^m2 or more and 10 g/ ^m2 or less, more preferably 1 g/ ^m2 or more and 6 g/ ^m2 or less, and even more preferably 2 g/ ^m2 or more and 5 g/ ^m2 or less.

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.

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

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

For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from plant raw materials. There are no particular limitations on the plant raw material, and any conventionally known plant can be used. Examples include corn, sugarcane, beet, and manioc.

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

The monomers that are the raw materials for biomass polyolefins may further contain fossil fuel-derived ethylene monomers and/or fossil fuel-derived α-olefin monomers, or may further contain biomass-derived α-olefin monomers.

The above α-olefins are not particularly limited in the number of carbon atoms, but those with 3 to 20 carbon atoms can usually be used, and butylene, hexene, or octene are preferable. This is because butylene, hexene, or octene can be produced by polymerizing ethylene, a raw material derived from biomass. In addition, by including such α-olefins, the polyolefin obtained by polymerization has alkyl groups as a branched structure, making it more flexible than simple linear ones.

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

The biomass polyolefin may contain two or more types of biomass polyolefins with different biomass degrees, and the biomass degree of the entire polyolefin resin layer may be within the range described below.

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, and 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 the A method of JIS K7112-1980 after performing annealing 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 an inner layer of a packaging product. In addition, 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 an inner layer of a packaging product.

The biomass polyolefin has a melt flow rate (MFR) of 0.1 g/10 min to 10 g/10 min, preferably 0.2 g/10 min to 9 g/10 min, more preferably 1 g/10 min to 8.5 g/10 min. The melt flow rate is a value measured by method A under 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.

Suitable biomass polyolefins include biomass-derived low-density polyethylene manufactured by Braskem (product name: SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree 95%), biomass-derived low-density polyethylene manufactured by Braskem (product name: SPB681, density: 0.922 g/cm ³ , MFR: 3.8 g/10 min, biomass degree 95%), and biomass-derived linear low-density polyethylene manufactured by Braskem (product name: SLL118, density: 0.916 g/cm ³ , MFR: 1.0 g/10 min, biomass degree 87%).

Examples of the above-mentioned fossil fuel-derived thermoplastic resins include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, and ionomers.

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

After drying, the 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. After drying, the 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.

The sealant layer 40 has a biomass degree of preferably 5% or more, more preferably 5% to 60%, and even more preferably 10% to 60%. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced. The biomass degree is a value shown by weight ratio, but it can also be shown as a value measured by measuring the content of biomass-derived carbon by radiocarbon (C14) measurement. That is, the proportion of biomass-derived carbon can be calculated by measuring the proportion of C14 contained in the total carbon atoms in the sealant layer. When the content of C14 in the sealant layer is P _C14 , the content of biomass-derived carbon P _bio can be calculated by the following formula, as above: P _bio (%) = P _C14 /105.5 x 100
The biomass degree of polyethylene produced using ethylene, which is a biomass-derived raw material, is the same whether expressed as a weight ratio or as a value measured by measuring the content of biomass-derived carbon by radiocarbon (C14) measurement.

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

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.

(Barrier Layer)
A layer other than those described above, such as a barrier layer, may be provided between the substrate layer and the print layer and/or between the adhesive layer and the sealant layer. As the barrier layer, a metal foil or a vapor-deposited layer of an inorganic material or an inorganic oxide can be suitably used.

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

(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 the composition and the method of formation are not particularly limited. The packaging material 10 may have two or more vapor deposition layers 60. When the packaging material 10 has two or more vapor deposition layers 60, each layer may have the same composition or different compositions.

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

Vapor deposition films of inorganic oxides such as silicon oxide and aluminum oxide have transparency. When the vapor deposition layer 60 is located on the outer surface 10y side of the printing layer 50, a vapor deposition film of an inorganic oxide having transparency is used as the vapor deposition layer 60.

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

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

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

(Gas barrier coating film)
The gas barrier coating film is a film that is provided on the deposition layer as necessary. The gas barrier coating film functions as a layer that suppresses the permeation of oxygen gas, water vapor, and the like. The gas barrier coating film is obtained from a gas barrier composition that contains at least one alkoxide represented by the general formula R ¹ _n M(OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the atomic valence of M) and the above-mentioned polyvinyl alcohol resin and/or ethylene-vinyl alcohol copolymer, and further, is polycondensed by the sol-gel method in the presence of a sol-gel catalyst, an acid, water, and an organic solvent.

As the alkoxide represented by the above general formula R ¹ _n M(OR ² ) _m , at least one of a partial hydrolyzate of an alkoxide and a condensate of hydrolysis of an alkoxide can be used. In addition, as the partial hydrolyzate of an alkoxide, it is not necessary that all of the alkoxy groups are hydrolyzed, and one in which one or more are hydrolyzed, or a mixture thereof may be used. As the condensate of hydrolysis of an alkoxide, a dimer or more of a partially hydrolyzed alkoxide, specifically a dimer to hexamer, is used.

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

In the alkoxides represented by the above general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ¹ include alkyl groups such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, t-butyl, n-hexyl, n-octyl, etc. In the alkoxides represented by the above general formula R ¹ _n M(OR ² ) _m , specific examples of the organic group represented by R ² include methyl, ethyl, n-propyl, i-propyl, n-butyl, sec-butyl, etc. These alkyl groups may be the same or different in the same molecule.

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

<Method of manufacturing packaging material>
Next, an example of a method for producing the laminate that constitutes the packaging material 10 will be described.

First, the above-mentioned base layer 20 and are prepared. The base layer 20 is provided with a printed layer 50 in advance. The base layer 20 may also include a barrier layer 60 such as a vapor deposition layer or a gas barrier coating film, if necessary.

Then, the printed layer 50 side of the base layer 20 is laminated to the sealant layer 40 via the adhesive layer 30 by a dry lamination method. This makes it possible to obtain a packaging material 10 comprising the base layer 20, the printed layer 50, the adhesive layer 30, and the sealant layer 40.

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

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

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

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

The packaging bag for the packaged product can be produced by folding the packaging material 10 in half, or by preparing two sheets of packaging material 10, overlapping the sealant layer 40 of the front packaging material 10 with the sealant layer 40 of the back packaging material 10 facing each other, and then heat sealing the peripheral edge of the material 10 in various forms, such as a side seal type, two-sided seal type, three-sided seal type, four-sided seal type, envelope seal type, hem seal type (pillow seal type), pleated seal type, flat bottom seal type, square bottom seal type, etc. It is also possible to produce a gusset-type packaging bag by inserting the folded packaging material 10 between the front packaging material 10 and the back packaging material 10 and heat sealing the material 10. It is not necessary that all of the packaging materials 10 constituting the packaging bag are the packaging materials 10 according to the present invention. That is, at least a portion 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 portion of the packaging material 10 constituting the packaging bag may be a packaging material 10 having an adhesive layer derived from fossil fuels.

Heat sealing can be performed by known methods such as bar sealing, rotary roll sealing, belt sealing, impulse sealing, high frequency sealing, ultrasonic sealing, etc.

Figure 5 is a diagram showing an example of a packaging bag 70 including packaging material 10. Bag 70 includes a surface film 74 that forms the surface, a back film 75 that forms the back, and a lower film 76 that forms the lower portion 72. The lower film 76 is folded back at fold-back portion 76f and is disposed between the surface film 74 and the back film 75. In this way, packaging bag 70 shown in Figure 5 is a self-supporting standing pouch with the lower portion configured as a gusset portion.

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

The terms "front film", "back film" and "lower film" mentioned above merely divide each film according to its positional relationship, and the method of providing the packaging material 10 when manufacturing the packaging bag 70 is not limited by the terms mentioned above. For example, the packaging bag 70 may be manufactured using one sheet of packaging material 10 in which the front film 74, the back film 75 and the lower film 76 are connected together, or may be manufactured using two sheets of packaging material 10, one sheet of packaging material 10 in which the front film 74 and the lower film 76 are connected together and one sheet of back film 75, or may be manufactured using three sheets of packaging material 10, one sheet of front film 74, one sheet of back film 75 and one sheet of lower film 76.

At least one of the front film 74, back film 75, and bottom film 76 is made of packaging material 10 having an adhesive layer containing biomass-derived components. This allows for a reduction in the amount of fossil fuels used compared to conventional methods, and reduces the environmental impact.

Figure 6 is a diagram showing another example of a packaging bag 70 including a packaging material 10. The packaging bag 70 shown in Figure 6 is substantially the same as the packaging bag 70 shown in Figure 5 except that it further includes a steam release mechanism 80. In the packaging bag 70 shown in Figure 6, the same parts as those in the packaging bag 70 shown in Figure 5 are designated by the same reference numerals and detailed descriptions are omitted.

As shown in FIG. 6, the packaging bag 70 is provided with a steam vent mechanism 80 for releasing steam generated when the contents contained in the storage section 77 are heated to the outside. The steam vent mechanism 80 is configured to communicate between the inside and outside of the packaging bag 70 to release steam when the steam pressure reaches or exceeds a predetermined value, and to prevent steam from escaping from any location other than the steam vent mechanism 80.

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

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

In the packaging bag 70 shown in FIG. 6, at least one of the front film 74, back film 75, and bottom film 76 is made of packaging material 10 having an adhesive layer containing biomass-derived components. This makes it possible to reduce the amount of fossil fuel used compared to conventional methods, thereby reducing the environmental burden.

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

As shown in FIG. 7, the packaging bag 70 is a portion through which the contents stored in the storage section 77 pass when the contents are removed. In this case, the contents are a liquid having fluidity. The width of the spout section 85 is narrower than the width of the storage section 77. This allows the user to accurately determine the pouring direction of the contents poured from the packaging bag 70 through the pouring outlet section 85.

In the example shown in FIG. 7, the spout section 85 is formed by a portion of the front film 74 and the back film 75. For example, the spout section 85 includes a spout seal section 86 that joins the front film 74 and the back film 75 to define the spout section 85 having a width narrower than the storage section 77. A packaging bag 70 having such a spout section 85 is suitable for use as a refill pouch that contains contents such as detergent, shampoo, and conditioner that can be refilled into a bottle.

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

In the packaging bag 70 shown in FIG. 7, at least one of the front film 74, back film 75, and bottom film 76 is made of packaging material 10 having an adhesive layer containing biomass-derived components. This allows for a reduction in the amount of fossil fuel used compared to conventional methods, and reduces the environmental impact.

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

In the packaging bag 70 shown in FIG. 8, at least one of the front film 74 and the back film 75 is made of a packaging material 10 having an adhesive layer containing a biomass-derived component. This allows for a reduction in the amount of fossil fuel used compared to conventional methods, and reduces the environmental impact.

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

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

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

In the example shown in FIG. 9, the lid 94 may be formed from a packaging material 10 having an adhesive layer containing a biomass-derived component. This allows for a reduction in the amount of fossil fuel used compared to conventional methods, and reduces the environmental impact.

<Other Aspects>
It is also an object of the present invention to provide a packaging material having an increased biomass content.
According to another aspect of the present invention, there is provided a packaging material including 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, and at least one of the polyol or the isocyanate compound including 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 and the polyfunctional carboxylic acid in 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 and the polyfunctional isocyanate in 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 a packaging material according to another aspect of the present invention, the printed layer includes 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 include a biomass-derived component.
In the packaging material according to another aspect of the present invention, the polyol in the printed layer may be a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid in the printed layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the polyol in the printed layer may be a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol and the polyfunctional isocyanate in the printed layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the base layer may have a base film containing polyester, polyamide or polyolefin.
In the packaging material according to another aspect of the present invention, the base film may contain a biomass polyester having ethylene glycol derived from biomass as the diol unit and a dicarboxylic acid derived from a fossil fuel as the dicarboxylic acid unit.
In the packaging material according to another aspect of the present invention, the sealant layer may contain polyolefin, which is a polymer of a monomer containing olefin.
In the packaging material according to another aspect of the present invention, the sealant layer may contain a biomass polyolefin, which is a polymer of a monomer containing ethylene derived from biomass.
According to another aspect of the present invention, there is provided a packaging product comprising the packaging material described above.
According to another aspect of the invention, the biomass content of the packaging material can be increased.

Next, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the description of the following examples as long as it does not deviate from the gist of the invention.

[Example 1A]
A fossil fuel-derived biaxially stretched PET film (thickness 12 μm) was prepared as the base film 22 of the base layer 20. Next, a print layer 50 was formed on the inner surface of the PET film using a fossil fuel-derived ink containing a cured product of a base agent containing a fossil fuel-derived polyester polyol and a curing agent containing a fossil fuel-derived isocyanate compound, to which a colorant was further added.

In addition, a polyethylene film 1 prepared as follows was used as the sealant film 42 of the sealant layer 40. 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 degree: 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 degree: 0%) were melt-kneaded to obtain a resin composition. Next, the obtained resin composition was formed into a film using a top-blowing air-cooled inflation co-extrusion film-forming machine to obtain a single-layer polyethylene film (biomass degree: 0%) for the sealant layer. The polyethylene film thus prepared is also referred to as the polyethylene film 1. The thickness of the polyethylene film 1 was 30 μm. Next, the base film 22 on which the printing layer 50 was formed and the sealant film 42 were bonded together by a dry lamination method using an adhesive layer 30 containing a biomass-derived component to obtain a packaging material 10. The adhesive layer 30 comprises a cured product of a polyether polyol (base material) obtained by reacting a polyfunctional alcohol containing a biomass-derived component with a polyfunctional isocyanate derived from a fossil fuel, and an isocyanate compound (curing agent) derived from a fossil fuel.

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

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

[Example 1C]
The packaging material 10 was produced in the same manner as in Example 1A, except that a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional isocyanate was used as the polyether polyol, which is the main component 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.

In Examples 1A to 1C, one of the three components of the adhesive layer, the polyfunctional alcohol or polyfunctional isocyanate used in the base polyether polyol, or the isocyanate compound used in the curing agent, is a biomass-derived component, but this is not limited to the above. For example, two of the three components may contain a biomass-derived component, or all three components may contain a biomass-derived component.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12/Bio mark/Bio adhesive/PE(1)30
"Bio-print" refers to a printed layer derived from biomass.

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

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

[Example 1G]
A packaging material 10 was produced in the same manner as in Example 1A, except that a material containing a biomass-derived component was used as the printed layer 50. 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 a fossil fuel, was used as the base material of the printed layer 50. In addition, an isocyanate compound derived from a fossil fuel was used as the curing agent of the printed layer 50.

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

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

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

In addition, in Examples 1D to 1I, the adhesive layer may be the adhesive layer shown in Examples 1B to 1C in addition to the adhesive layer shown in Example 1A.

[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.

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
Bio PET12/Bio mark/Bio adhesive/PE(1)30
"Bio-PET" refers to a PET film derived from biomass.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12/Bio mark/Bio adhesive/PE(2)30
"PE(2)" refers to the polyethylene film 2 described above.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
Bio PET12/Bio mark/Bio adhesive/PE(2)30

In addition, in Examples 1J to 1L, the adhesive layer may be the adhesive layer shown in Examples 1B to 1C in addition to the adhesive layer shown in Example 1A. Also, the printed layer may be the printed layer shown in Examples 1A to 1I in addition to the printed layer shown in Example 1G.

The layer structures of the packaging materials 10 of Examples 1A to 1L are shown together in Figure 10. In the "Type of adhesive layer" column of Figure 10, the entry "Ether-based" means that the main agent used in the adhesive layer is polyether polyol.
In the column "Biomass-derived components in the adhesive layer," the term "polyfunctional alcohol" means that at least the polyfunctional alcohol of the main agent among the main agent and curing agent components used in the adhesive layer is derived from biomass. Similarly, the term "isocyanate compound" means that at least the isocyanate compound of the curing agent among the main agent and curing agent components used in the adhesive layer is derived from biomass.

Similarly, in the "Type of Printed Layer" column, the entry "Ether-based" means that the main agent used in the printed layer is polyether polyol. Also, the entry "Ester-based" means that the main agent used in the printed layer is polyester polyol. Also, in the "Biomass-derived components in the printed layer" column, the entry "Polyfunctional alcohol" means that at least the main agent polyfunctional alcohol of the main agent and hardener used in the printed layer is derived from biomass. Similarly, the entry "Polyfunctional carboxylic acid" means that at least the main agent polyfunctional carboxylic acid of the main agent and hardener used in the printed layer is derived from biomass. Similarly, the entry "Isocyanate compound" means that at least the main agent is an isocyanate compound of the hardener of the main agent and hardener used in the printed layer is derived from biomass. Also, in the "Biomass-derived components in the printed layer" column, the entry "-" means that the printed layer does not contain biomass-derived components.

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

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

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

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

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

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

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

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12/printed/bio-sealed/CPP20

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
Barrier OPP20/Print/Bio-seal/CPP20

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET20/printed/bio-bonded/CNY60
"CNY" stands for fossil fuel-derived nylon film.

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
IB-PET12/Printed/Bio-bonded/PE(1)40

In the packaging materials of Examples 2A to 9 described so far, the adhesive layer may be the adhesive layer shown in Examples 1B to 1C other than that used in Example 1A. Also, the printing layer may be the same as that used in Examples 1B to 1L other than that used in Example 1A.

[Example 10]
The packaging material 10 was produced in the same manner as in Example 1A, except that a biaxially stretched nylon film (thickness 15 μm) derived from fossil fuel was used as the base film 22, a polyethylene film 1 having a thickness of 50 μm was used as the sealant film 42, and 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 for the adhesive layer 30, and an isocyanate compound derived from fossil fuel was used as the curing agent.

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

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

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

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

In addition, the printing layer may be a variation similar to that used in Examples 1B to 1L other than that used in Example 1A.

Figure 11 shows examples of the layer structure of the packaging material 10 and types of packaging containers for Examples 1A and 2A to 11.

10 Packaging material 20 Base material layer 22 Base material film 30 Adhesive layer 40 Sealant layer 42 Sealant film 50 Printed layer 60 Barrier layer

Claims (9)

1. A packaging product comprising packaging material,
The packaging material includes at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer;
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 polyether polyol, which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate,
The polyfunctional alcohol includes neopentyl glycol derived from biomass,
A packaging product for use in applications that do not contain contents that are to be subjected to heat sterilization. 1. A packaging product comprising packaging material,
The packaging material includes at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer;
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 and the isocyanate compound contains a biomass-derived component;
The printed layer contains a colorant and a cured product of a polyol and an isocyanate compound,
The polyol of the printing layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid,
one of the polyfunctional alcohol and the polyfunctional carboxylic acid of the printing layer contains a biomass-derived component and the other is derived from a fossil fuel;
A packaging product for use in applications that do not contain contents that are to be subjected to heat sterilization. 1. A packaging product comprising packaging material,
The packaging material includes at least a substrate layer, a printing layer, an adhesive layer, and a sealant layer;
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 and the isocyanate compound contains a biomass-derived component;
the printed layer includes a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol and the isocyanate compound includes a biomass-derived component;
The polyol of the printing layer is a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate,
A packaging product for use in applications that do not contain contents that are to be subjected to heat sterilization. The packaging product of claim 3 , wherein at least one of the polyfunctional alcohol or the polyfunctional isocyanate of the printed layer comprises a biomass-derived component. 5. The packaging product of claim 1, wherein the isocyanate compound of the adhesive layer comprises a biomass-derived component. The packaging product of claim 1 , wherein the substrate layer comprises a substrate film comprising polyester, polyamide or polyolefin. The packaging product according to claim 6 , wherein the base film comprises a biomass polyester having ethylene glycol derived from biomass as a diol unit and a dicarboxylic acid derived from a fossil fuel as a dicarboxylic acid unit. 8. The packaging product of claim 1, wherein the sealant layer comprises a polyolefin, which is a polymer of monomers that contain olefins. 9. The packaging product of claim 8 , wherein the sealant layer comprises a biomass polyolefin, which is a polymer of monomers including ethylene derived from biomass.

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