JP7385835B2 - Packaging materials and products - Google Patents

Description

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

Conventionally, various packaging materials have been developed and proposed as packaging materials for constructing packaging products for filling and packaging various items such as food and drink, pharmaceuticals, chemicals, cosmetics, sanitary products, daily necessities, etc. The packaging material is composed of a laminate in which at least a base layer containing stretched plastic or the like and a sealant layer for welding the packaging materials together are laminated. Typically, 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 increasing calls for building a recycling-oriented society, there is a desire to move away from fossil fuels in the field of laminates that make up packaging materials, just as in the energy field, and the use of biomass is attracting attention. There is. Biomass is an organic compound that is photosynthesized from carbon dioxide and water, and by using it, it becomes carbon dioxide and water again, so it is a so-called carbon-neutral renewable energy. In recent years, the practical use of biomass plastics made from these biomass raw materials is rapidly progressing, and attempts are also being made to produce various resins from biomass raw materials.

Commercial production of biomass-derived resins began first with polylactic acid (PLA), which is produced through lactic acid fermentation, but its performance as a plastic, including its biodegradability, is superior to that of today's general-purpose plastics. Because it is very different from the conventional method, there are limits to product applications and product manufacturing methods, and it has not become widely used. In addition, life cycle assessment (LCA) evaluations are being conducted on PLA, and discussions are taking place regarding the energy consumption during PLA production and the equivalency when replacing 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 formed into films, sheets, bottles, etc., and is 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 has a large environmental impact. Therefore, it is desired to reduce the amount of fossil fuel used by using biomass-derived raw materials in the production of polyethylene. For example, to date, research has been conducted on producing ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see Patent Document 1).

Furthermore, polyester has excellent mechanical properties, chemical stability, heat resistance, transparency, etc., and is inexpensive, so it is widely used in various industrial applications. Polyester is obtained by polycondensing diol units and dicarboxylic acid units. For example, polyethylene terephthalate (hereinafter sometimes abbreviated as PET) is obtained by esterifying ethylene glycol and terephthalic acid as raw materials. After that, it is produced by polycondensation reaction. These raw materials are produced from petroleum, which is a fossil resource; for example, ethylene glycol is industrially produced from ethylene, and terephthalic acid is industrially produced from xylene.

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

Special Publication No. 2011-506628 JP2012-96410A

In conventional packaging materials, the printed layer of the laminate is formed from fossil fuel-derived materials, which causes a decrease in the biomass content of the entire packaging material. Therefore, in a packaging material constituted by a laminate including a base layer, a printed layer, an adhesive layer, and a sealant layer, there is a need to further increase the biomass content of the entire packaging material.

The present invention has been made in consideration of these points, and an object of the present invention is to provide a packaging material with an increased biomass content.

The present invention is a packaging material comprising at least a base layer, a printed layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer, and the printed layer is composed of polyol and isocyanate. at least one of the polyol or the isocyanate compound contains a biomass-derived component, and the polyol of the printing layer is a polyester polyol of 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 fossil fuel, and the thermoplastic resin constituting the sealant layer is derived from fossil fuel. The packaging material is a packaging material in which the thermoplastic resin includes polypropylene or a propylene-ethylene copolymer.

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

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

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

The present invention is a packaging product comprising the packaging material described above.

According to the present invention, the biomass content of packaging materials can be increased.

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. 3 is a diagram showing the layer structure of packaging materials of Examples 1A to 1L. FIG. 3 is a diagram showing the layer structure of 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 printing layer, an adhesive layer, and a sealant layer. In the present invention, by forming the printing layer from a material containing a biomass-derived component, the amount of fossil fuel used can be reduced compared to the conventional method, and the environmental load can be reduced.

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

The 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.

The packaging material according to the present invention may further include at least one other layer such as a metal foil, a vapor deposited layer, a barrier layer such as a gas barrier coating film, etc., in addition to the above-mentioned layers. When having two or more other layers, they may have the same composition or different compositions.

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

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

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 of FIG.

Furthermore, the packaging material 10 shown in FIG. 4 includes a first barrier layer 61 between the base film 22 and the printing layer 50 of the packaging material 10 in FIG. A second barrier layer 62 is provided in between.

Although the packaging material 10 shown in FIGS. 2 to 4 includes a barrier layer 60, 61 or 62, the barrier layer may have a single layer structure such as a metal foil or a vapor deposited layer, and the barrier layer may have a single layer structure such as a metal foil or a vapor deposited layer. It may also have a laminated structure in which a gas barrier coating film is formed on top.

Note that it is also possible to appropriately combine the plurality of layer configurations of the packaging material 10 shown in FIGS. 1 to 4 described above.

Each layer constituting the packaging material 10 will be explained below.

(Base film)
The base film 22 of the base layer 20 is a plastic film. The base film 22 may contain a biomass-derived component, 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 biomass polyester or biomass polyethylene described below.

Biomass polyester uses biomass-derived ethylene glycol as a diol unit and fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. In addition to the biomass polyester, the base material layer may further include a fossil fuel-derived polyester having fossil fuel-derived ethylene glycol as a diol unit and fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. It is sufficient if the following biomass degree can be achieved for the base material layer as a whole. In the present invention, since the base material layer contains biomass polyester, the amount of fossil fuel-derived polyester can be reduced compared to the conventional method, and the environmental load can be reduced.

In the present invention, the "biomass degree" may be expressed as a value obtained by measuring the content of biomass-derived carbon by 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 measured by radiocarbon (C14) measurement is expressed as the "degree of biomass", the "degree of biomass" can be determined as follows. In other words, since carbon dioxide in the atmosphere contains C14 at a certain rate (105.5 pMC), the C14 content in plants that grow by taking in atmospheric carbon dioxide, such as corn, is also around 105.5 pMC. It is known that It is also known that fossil fuels contain almost no C14. Therefore, by measuring the proportion of C14 contained in all carbon atoms in polyester, the proportion of carbon derived from biomass can be calculated. In the present invention, the biomass-derived carbon content P _bio can be determined as follows, where the C14 content in the polyester is P _C14 .
P _bio (%) = P _C14 /105.5×100
Note that pMC is an abbreviation for Percent Modern Carbon.

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

Furthermore, when expressing the "degree of biomass" by the weight ratio of biomass-derived components, the "degree of biomass" can be determined as follows. For example, taking polyethylene terephthalate as an example, as mentioned above, polyethylene terephthalate is a product obtained by polymerizing ethylene glycol containing two carbon atoms and terephthalic acid containing eight carbon atoms in a molar ratio of 1:1. When only biomass-derived glycol is used, the weight ratio of biomass-derived components in polyester is about 30%, so the biomass degree is about 30%. In addition, the weight ratio of biomass-derived components in fossil fuel-derived polyester produced using fossil fuel-derived ethylene glycol and fossil fuel-derived dicarboxylic acid is 0%, and the biomass content of fossil fuel-derived polyester is 0%. It becomes 0%. Hereinafter, unless otherwise specified, "biomass degree" refers to the weight ratio of biomass-derived components.

When the base film 22 contains a biomass-derived component, the degree of biomass 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 fossil fuel-derived polyester can be reduced compared to the conventional method, and the environmental load can be reduced.

Biomass-derived ethylene glycol is made from ethanol produced from biomass (biomass ethanol). For example, biomass-derived ethylene glycol can be obtained by converting biomass ethanol into ethylene glycol via ethylene oxide using a conventionally known method. Moreover, commercially available biomass ethylene glycol may be used, and for example, biomass ethylene glycol commercially available from India Glycol Corporation can be suitably used.

The dicarboxylic acid unit of the biomass polyester uses dicarboxylic acid derived from fossil fuels. As the dicarboxylic acid, aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and derivatives thereof can be used without limitation. 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. Examples include esters. Among these, terephthalic acid is preferred, and as the aromatic dicarboxylic acid derivative, dimethyl terephthalate is preferred.

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

The biomass polyester may be a copolymerized polyester in which a copolymerized component is added as a third component in addition to the diol component and dicarboxylic acid component described above. Specific examples of copolymerization components include bifunctional oxycarboxylic acids, trifunctional or more polyhydric alcohols, trifunctional or more polycarboxylic acids and/or their anhydrides, and trifunctional or more functional polyhydric alcohols to form a crosslinked structure. At least one type of polyfunctional compound selected from the group consisting of oxycarboxylic acids having higher than functional functions is mentioned. Among these copolymerization components, bifunctional and/or trifunctional or higher functional oxycarboxylic acids are particularly preferably used because copolymerized polyesters with a high degree of polymerization tend to be easily produced. Among these, the use of trifunctional or higher functional oxycarboxylic acids is most preferable because polyester with a high degree of polymerization can be easily produced in a very small amount without using a chain extender described later.

The biomass polyester can be obtained by a conventionally known method of polycondensing the diol units and dicarboxylic acid units described above. Specifically, after performing the esterification reaction and/or transesterification reaction between the above-mentioned dicarboxylic acid component and diol component, a general method of melt polymerization in which a polycondensation reaction is performed under reduced pressure, and an organic solvent It can be produced by a known solution heating dehydration condensation method using. The amount of diol used when producing biomass polyester is substantially equimolar to 100 moles of dicarboxylic acid or its derivative, but generally it is used in esterification and/or transesterification reaction and/or polycondensation reaction. It is preferable to use an excess amount of 0.1 mol % or more and 20 mol % or less because of the possibility of distillation.

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

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

When the base film 22 is formed of a material that does not contain biomass-derived components, the base film 22 may be, for example, a polyester film such as a polyethylene terephthalate film or a polybutylene terephthalate film, a polyolefin film such as a polyethylene film or a polypropylene film, or a nylon film. or polyamide films such as nylon 6/metaxylylenediamine nylon 6 co-extruded co-stretched films, polypropylene/ethylene-vinyl alcohol copolymer co-extruded co-stretched films, or composite films made by laminating two or more of these films. Plastic films can be used. Note that 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. A stretched plastic film is obtained, for example, by heating a plastic film extruded onto a cooling drum using roll heating, infrared heating, or the like, and stretching the film in the longitudinal direction. This stretching is preferably carried out using the difference in circumferential speed between two or more rolls. Longitudinal stretching is usually performed at a temperature range of 50°C or higher and 100°C or lower. Further, the longitudinal stretching ratio is preferably 2.5 times or more and 4.2 times or less, although it depends on the required characteristics of the film application. If the stretching ratio is less than 2.5 times, the thickness of the film becomes uneven and it is difficult to obtain a good film.

The longitudinally stretched film is then sequentially subjected to transverse stretching, heat setting, and heat relaxation to become a biaxially stretched film. The transverse stretching is usually performed at a temperature range of 50°C or higher and 100°C or lower. The transverse stretching ratio is preferably 2.5 times or more and 5.0 times or less, although it depends on the required characteristics of this use. If it is less than 2.5 times, the thickness of the film becomes uneven and it is difficult to obtain a good film, and if it exceeds 5.0 times, breakage is likely to occur during film formation.

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

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

The base film 22 may be a single layer film or a co-pressed 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 aesthetic appearance. The printing layer 50 includes, for example, a pattern layer that forms any desired pattern such as a picture, a photograph, a character, a number, a figure, a symbol, a pattern, or the like. The printing layer may further include a ground color layer formed by printing to make the pattern of the pattern layer stand out. The printing layer 50 includes a colorant and a cured product of a polyol and an isocyanate compound. The printed layer 50 contains biomass-derived components. Specifically, the printing layer 50 can be formed using a cured product in which at least one of a polyol as a main ingredient and an isocyanate compound as a curing agent contains a biomass-derived component. As the polyol, a polyester polyol that is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, or a polyether polyol that 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 the biomass-derived component. The following examples can be given as polyester polyols containing biomass-derived components.
・Reactant of biomass-derived polyfunctional alcohol and biomass-derived polyfunctional carboxylic acid ・Reactant of fossil fuel-derived polyfunctional alcohol and biomass-derived polyfunctional carboxylic acid ・Biomass-derived polyfunctional alcohol and fossil fuel-derived polyfunctional alcohol reaction product with polyfunctional carboxylic acid

As the biomass-derived polyfunctional alcohol, aliphatic polyfunctional alcohols obtained from plant materials such as corn, sugarcane, cassava, and sago palm can be used. Examples of biomass-derived aliphatic polyfunctional alcohols include polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), and butylene, which are obtained from plant materials by the following methods. Examples include glycol (BG) and hexamethylene glycol, any of which can be used. These may be used alone or in combination.

Biomass-derived polypropylene glycol is produced by converting glycerol into 3-hydroxypropyl aldehyde (HPA) using a fermentation method in which glucose is obtained by decomposing plant materials. Compared to polypropylene glycol produced using the EO method, polypropylene glycol produced using biomethods such as the fermentation method described above is safer and produces useful by-products such as lactic acid, and can also be produced at lower production costs. It is also preferable that it is possible.
Butylene glycol derived from biomass can be produced by producing succinic acid obtained by producing glycol from plant materials and fermenting it, and then hydrogenating this.
Biomass-derived ethylene glycol can be produced, for example, from bioethanol obtained by a conventional method via ethylene.

As the fossil fuel-derived polyfunctional alcohol, a compound having two or more hydroxyl groups, preferably 2 to 8 hydroxyl groups in one molecule can be used. Specifically, the polyfunctional alcohol derived from fossil fuels is not particularly limited, and conventionally known ones can be used, such as polypropylene glycol (PPG), neopentyl glycol (NPG), and ethylene glycol (EG). , diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, as well as 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.

Biomass-derived polyfunctional carboxylic acids include reproducible plant-derived oils such as soybean oil, linseed oil, tung oil, coconut oil, palm oil, and castor oil, as well as recycled waste cooking oils based on these oils. Aliphatic polyfunctional carboxylic acids obtained from plant materials such as oils can be used. Examples of biomass-derived aliphatic polyfunctional carboxylic acids include sebacic acid, succinic acid, phthalic acid, adipic acid, glutaric acid, and dimer acid. For example, sebacic acid is produced by alkaline thermal decomposition of ricinoleic acid obtained from castor oil, with heptyl alcohol as a by-product. In the present invention, it is particularly preferable to use biomass-derived succinic acid or biomass-derived sebacic acid. These may be used alone or in combination of two or more.

As the polyfunctional carboxylic acid derived from fossil fuels, aliphatic polyfunctional carboxylic acids and aromatic polyfunctional carboxylic acids can be used. The aliphatic polyfunctional carboxylic acid derived from fossil fuels is not particularly limited and conventionally known ones can be used, such as adipic acid, dodecanedioic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, maleic anhydride. Examples include acids, itaconic anhydride, sebacic acid, succinic acid, glutaric acid, dimer acid, and ester compounds thereof. Furthermore, the aromatic polyfunctional carboxylic acid derived from fossil fuels is not particularly limited and conventionally known ones can be used, such as isophthalic acid, terephthalic acid, naphthalene dicarboxylic acid, phthalic anhydride, trimellitic acid, and pyromellitic acid, and ester compounds thereof, etc. can be used. 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 the biomass-derived component. The following examples can be given as polyether polyols containing biomass-derived components.
・Reactant of biomass-derived polyfunctional alcohol and biomass-derived polyfunctional isocyanate ・Reactant of fossil fuel-derived polyfunctional alcohol and biomass-derived polyfunctional isocyanate ・Reactant of biomass-derived polyfunctional alcohol and fossil fuel-derived polyfunctional isocyanate Reactant with functional 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 explained in the above-mentioned polyester polyol can be used.

Biomass-derived polyfunctional isocyanates are produced by converting plant-derived divalent carboxylic acids into acid amides, reducing them to terminal amino groups, and then reacting with phosgene to convert the amino groups into isocyanate groups. What is obtained can be used. The biomass-derived polyfunctional isocyanate is, for example, a biomass-derived diisocyanate. Examples of biomass-derived diisocyanates include dimer acid diisocyanate (DDI), octamethylene diisocyanate, decamethylene diisocyanate, and the like. Furthermore, a plant-derived diisocyanate can also be obtained by using a plant-derived amino acid as a raw material and converting its amino group into an isocyanate group. For example, lysine diisocyanate (LDI) is obtained by methyl esterifying the carboxyl group of lysine and then converting the amino group into an isocyanate group. Furthermore, 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 a phosgenation method and a carbamate method. More specifically, the phosgenation method includes a method in which 1,5-pentamethylenediamine or a salt thereof is directly reacted with phosgene, and a method in which the hydrochloride of pentamethylenediamine is suspended in an inert solvent and reacted with phosgene. This method synthesizes 1,5-pentamethylene diisocyanate. In addition, in the carbamate method, 1,5-pentamethylene diisocyanate is first produced by carbamateing 1,5-pentamethylene diamine or its salt to produce pentamethylene dicarbamate (PDC), and then thermally decomposing it to produce 1,5-pentamethylene diisocyanate. It is something that is synthesized. In the present invention, the polyisocyanate preferably used includes 1,5-pentamethylene diisocyanate-based polyisocyanate (trade name: Stabio (registered trademark)) manufactured by Mitsui Chemicals, Inc.

The polyfunctional isocyanate derived from fossil fuels is not particularly limited and conventionally known ones can be used, 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), Aromatic diisocyanates such as jurylene diisocyanate, toridine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, and dibenzyl 4,4'-diisocyanate are mentioned. Also, aliphatic diisocyanates such as methylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,10-decamethylene diisocyanate; 1,4-cyclohexylene diisocyanate, 4,4-methylene bis(cyclohexyl isocyanate) ), 1,5-tetrahydronaphthalene diisocyanate, isophorone diisocyanate, hydrogenated MDI, hydrogenated XDI, and other alicyclic diisocyanates. These may be used alone or in combination of two or more.

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

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

The weight of the printed layer 50 after drying is preferably 0.1 g/m ² or more and 10 g/m ² or less, more preferably 1 g/m ² or more and 5 g/m ² or less, and even more preferably 1 g/m 2 ^or more and 3 g/m 2 or less. ² or less.

The printed 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 printing layer 50 and the sealant layer 40 that constitute the packaging material 10. Furthermore, when a barrier layer 60 such as a vapor deposited layer is included between the adhesive layer 30 and the sealant layer 40, it goes without saying that the adhesive layer 30 functions to adhere the printed layer 50 and the barrier layer 60. stomach. The adhesive layer 30 includes a cured product of a polyol and an isocyanate compound. The adhesive layer 30 may be made of conventionally known fossil fuel-derived polyols and isocyanate compounds; however, by using a polyol or an isocyanate compound in which at least one of the polyols and isocyanate compounds contains a biomass-derived component, The amount of fossil fuel used can be reduced, and the environmental impact can be reduced.

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

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

The weight of the adhesive layer after drying is preferably 0.1 g/m ² or more and 10 g/m ² or less, more preferably 1 g/m ² or more and 6 g/m ² or less, and even more preferably 2 g/m 2 or ^more and 5 g/m 2 or less. ² 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 contain a biomass-derived component, or may not contain a biomass-derived component. When forming the sealant layer 40 using a material containing a biomass-derived component, the sealant layer 40 can be formed using the following biomass polyolefin. Furthermore, when forming the sealant layer 40 using a material that does not contain biomass-derived components, the sealant layer 40 can be formed using a conventionally known fossil fuel-derived thermoplastic resin.

Biomass polyolefin is a polymer of monomers containing olefins such as ethylene derived from biomass. Since biomass-derived olefin is used as the raw material monomer, the polymerized polyolefin is biomass-derived. Note that the raw material monomer for the polyolefin does not have to contain 100% by mass of biomass-derived olefin.

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

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

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

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

As the biomass polyolefin, polyethylene or a copolymer of ethylene and α-olefin may be used alone, or two or more types may be used as a mixture. In particular, the biomass polyolefin is preferably polyethylene. This is because by using ethylene, which is a biomass-derived raw material, it is theoretically possible to manufacture with 100% biomass-derived components.

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

The biomass polyolefin is preferably 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 0.928 g/cm ³ or less. It has a density of .925 g/cm ³ or less. The density of the biomass polyolefin is a value measured according to the method specified in Method A of JIS K7112-1980 after performing annealing as described in JIS K6760-1995. If the density of the biomass polyolefin is 0.91 g/cm ³ or more, the rigidity of the polyolefin resin layer containing the biomass polyolefin can be increased, and it can be suitably used as an inner layer of a packaged product. Further, 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 improved, and it can be suitably used as an inner layer of a packaged product.

The biomass polyolefin has a melt flow of 0.1 g/10 minutes or more and 10 g/10 minutes or less, preferably 0.2 g/10 minutes or more and 9 g/10 minutes or less, and more preferably 1 g/10 minutes or more and 8.5 g/10 minutes or less. rate (MFR). 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 minutes or more, the extrusion load during molding can be reduced. Moreover, if the MFR of the biomass polyolefin is 10 g/10 minutes or less, the mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be increased.

Suitably used biomass polyolefins include biomass-derived low-density polyethylene manufactured by Braskem (trade name: SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree 95%); Low-density polyethylene derived from biomass manufactured by Braskem (product name: SPB681, density: 0.922 g/cm ³ , MFR: 3.8 g/10 min, biomass degree 95%), linear chain derived from biomass manufactured by Braskem Examples include low-density polyethylene (trade name: SLL118, density: 0.916 g/cm ³ , MFR: 1.0 g/10 min, biomass degree 87%).

Examples of the 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, Examples include ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, and ionomer.

The sealant layer may be formed by dry laminating a sealant film on the printing layer on the base material layer side via an adhesive layer, or the above-mentioned thermoplastic resin may be formed on the adhesive layer side by melt extrusion lamination method. The sealant layer may be formed by extrusion and film formation. Further, when a melt extrusion lamination method is employed, an anchor coat layer may be provided by applying an anchor coat agent to the surface of the adhesive layer and drying it. Examples of the anchor coating agent include anchor coating agents made of any resin having a heat resistance temperature of 135°C or higher, such as vinyl modified resin, epoxy resin, urethane resin, polyester resin, polyethyleneimine, etc. An anchor coating agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Further, a silane coupling agent may be used together as an additive, and nitrified cotton may be used together in order to improve heat resistance.

The anchor coat layer after drying has a thickness of 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The adhesive layer after drying has a thickness of 1 μm or more and 10 μm or less, preferably 2 μm or more and 5 μm or less. The adhesive resin layer 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 preferably has a biomass degree of 5% or more, more preferably 5% or more and 60% or less, and even more preferably 10% or more and 60% or less. If the biomass degree is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be reduced. The above biomass degree is a value expressed as a weight ratio, but it can also be expressed as a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement. That is, by measuring the proportion of C14 contained in all carbon atoms in the sealant layer, the proportion of carbon derived from biomass can be calculated. When the content of C14 in the sealant layer is P _C14 , the biomass-derived carbon content P _bio is determined by the following formula P _bio (%) = P _C14 /105.5×100
It can be found by The biomass degree of polyethylene produced using ethylene, which is a raw material derived from biomass, can be expressed as a weight ratio or as a value measured by the content of biomass-derived carbon by radiocarbon (C14) measurement. The value will be the same.

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

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 still 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 base material layer and the printing layer and/or between the adhesive layer and the sealant layer. As the barrier layer, a metal foil or a vapor deposited layer of an inorganic or 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 from the viewpoint of gas barrier properties that block the transmission of oxygen gas, water vapor, etc., and light shielding properties that block the transmission of visible light, ultraviolet rays, etc. Furthermore, since the packaging bag can be given metallic luster, the design can be improved. The thickness of the metal foil is, for example, 5 μm or more and 15 μm or less.

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

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

Vapor deposited films of inorganic oxides such as silicon oxide and aluminum oxide have transparency. When the vapor deposition layer 60 is located closer to the outer surface 10y than the printing layer 50, a vapor deposition film of a transparent inorganic oxide is used as the vapor deposition layer 60.

Inorganic oxides are expressed as, for example, MO _x such as SiO _x , _AlO expressed. The value range of X is 0 to 2 for silicon (Si), 0 to 1.5 for aluminum (Al), 0 to 1 for magnesium (Mg), 0 to 1 for calcium (Ca), Potassium (K) is 0 to 0.5, tin (Sn) is 0 to 2, sodium (Na) is 0 to 0.5, boron (B) is 0 to 1, 5, titanium (Ti) can take a value in the range of 0 to 2, lead (Pb) can take a value in the range of 0 to 1, zirconium (Zr) can take a value in the range of 0 to 2, and yttrium (Y) can take a value in the range of 0 to 1.5. In the above, when X=0, it is a completely inorganic substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are preferably used as the vapor deposition layer 60 of the packaging material 10, with silicon (Si) having a concentration of 1.0 to 2.0 and aluminum (Al) having a concentration of 0.5 to 1. Values in the range of .5 can be used.

The thickness of the vapor-deposited film of the inorganic substance or inorganic oxide described above varies depending on the type of inorganic substance or inorganic oxide used, but is, for example, within the range of 50 Å or more and 2000 Å or less, preferably 100 Å or more and 1000 Å or less. It is preferable to select and form it arbitrarily. More specifically, in the case of a vapor deposited film of aluminum, the film thickness is desirably 50 Å or more and 600 Å or less, more preferably 100 Å or more and 450 Å or less, and in the case of a vapor deposited film of aluminum oxide or silicon oxide, The film thickness is desirably 50 Å or more and 500 Å or less, more preferably 100 Å or more and 300 Å or less.

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

(Gas barrier coating film)
The gas barrier coating film is a film provided on the vapor deposition layer as necessary. The gas barrier coating film functions as a layer that suppresses permeation of oxygen gas, water vapor, and the like. The gas barrier coating film has a 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, and n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the valence of M.) and a polyvinyl alcohol system as described above. It is obtained by a gas barrier composition containing a resin and/or an ethylene/vinyl alcohol copolymer, and further polycondensed by a sol-gel method in the presence of a sol-gel method catalyst, 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, the partial hydrolyzate of the alkoxide described above does not necessarily have to have all the alkoxy groups hydrolyzed, and may be one in which one or more alkoxy groups have been hydrolyzed, or a mixture thereof. As the condensate of alkoxide hydrolysis, a dimer or more of 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, and the like can be used as the metal atom represented by M. In this embodiment, preferable metals include silicon, titanium, and the like. Furthermore, in the present invention, alkoxides can be used alone or in combination of two or more alkoxides of different metal atoms in the same solution.

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

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

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

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

Subsequently, the print layer 50 side of the base layer 20 and the sealant layer 40 are laminated with the adhesive layer 30 interposed therebetween by dry lamination. Thereby, the packaging material 10 including the base layer 20, the printed layer 50, the adhesive layer 30, and the sealant layer 40 can be obtained.

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

The packaging material 10 is provided with surface functions such as chemical functions, electrical functions, magnetic functions, mechanical functions, friction/wear/lubrication functions, optical functions, thermal functions, and biocompatibility. , it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metallization (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, coating, etc.). Moreover, a molded product can also be manufactured by subjecting the packaging material according to the present invention to lamination processing (dry lamination or extrusion lamination), bag making processing, and other post-processing processing.

<Packaged products>
Examples of packaging products formed using packaging materials include packaging bags, laminate tubes, lids, sheet molded products, label materials, and the like.

Packaging products comprising packaging materials include, for example, food and beverages, fruit juices, juices, drinking water, alcoholic beverages, cooked foods, seafood paste products, frozen foods, meat products, boiled foods, rice cakes, liquid soups such as pot soups, etc. It can be suitably used as packaging for various foods and beverages such as seasonings, cosmetics such as liquid detergents, shampoos, conditioners, etc., sanitary products, daily necessities, and chemical products. Specific examples of foods and drinks include coffee, coffee beans, coffee powder, ice cream, gummies, prepared foods, pasta sauce, curry, jelly, bacon, chocolate, chocolate paste, and the like. Specific examples of daily necessities include absorbent cotton, masks, bath salts, and powdered milk. In addition, as illustrated in the examples below, a packaging product including the packaging material 10 configured to have heat resistance is used for storing contents to be subjected to heat sterilization treatment such as retort treatment and boiling treatment. can be used. Note that retort processing 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 under pressure using steam or heated hot water. The temperature of the retort treatment is, for example, 120° C. or higher. Boiling is a process of filling a packaged product with contents, sealing the packaged product, and then boiling the packaged product in hot water under atmospheric pressure. The temperature of the boiling treatment is, for example, 90°C or higher and 100°C or lower.

A packaging bag for a packaging product is made by folding the packaging material 10 in half or by preparing two packaging materials 10 and placing the sealant layer 40 of the front packaging material 10 and the sealant layer 40 of the back packaging material 10 facing each other. Then, the peripheral edges are stacked, for example, side seal type, two side seal type, three side seal type, four side seal type, envelope pasting seal type, gasho pasting seal type (pillow seal type), pleated seal type, Various types of packaging bags can be manufactured by heat sealing using a heat sealing method such as a flat bottom seal type or a square bottom seal type. Furthermore, a gusset-type packaging bag can also be manufactured by heat-sealing the folded packaging material 10 inserted between the front packaging material 10 and the back packaging material 10. Note that not all of the packaging materials 10 constituting the packaging bag may be 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 have an adhesive layer containing a biomass-derived component, and the other portion of the packaging material 10 constituting the packaging bag may be a component derived from fossil fuels. The packaging material 10 may have an adhesive layer.

As the heat sealing method, for example, known methods such as bar sealing, rotating roll sealing, belt sealing, impulse sealing, high frequency sealing, and ultrasonic sealing can be used.

FIG. 5 is a diagram showing an example of a packaging bag 70 including the packaging material 10. The bag 70 includes a front film 74 constituting the front surface, a back film 75 constituting the back surface, and a lower film 76 constituting the lower part 72. The lower film 76 is placed between the front film 74 and the back film 75 in a state of being folded back at the folding portion 76f. In this way, the packaging bag 70 shown in FIG. 5 is a self-supporting standing pouch whose lower part is configured as a gusset.

The inner surfaces of the front film 74, the back film 75, and the lower film 76 are joined to each other by a seal portion. In a front view of the packaging bag 70 such as in FIG. 5, the seal portion is hatched. As shown in FIG. 5, the seal portion has an outer edge seal portion extending along the outer edge of the packaging bag 70. As shown in FIG. The outer edge seal portion includes a lower seal portion 72 a that extends to the lower portion 72 and a pair of side seal portions 73 a that extends along a pair of side portions 73 . In addition, in the packaging bag 70 in a state before it is filled with contents (a state in which it is not filled with contents), as shown in FIG. 5, the upper part 71 of the bag 70 is an opening 71b. After the contents are stored 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 part 71, thereby forming an upper seal portion and sealing the packaging bag 70.

Note that the terms "front film", "back film", and "lower film" mentioned above are merely divisions of each film according to the positional relationship, and the terms "front film", "back film", and "lower film" are merely divisions of each film according to the positional relationship, and the terms "front film", "back film", and "lower film" are merely divisions of each film according to the positional relationship. The method is not limited by the above terms. For example, the packaging bag 70 may be manufactured using a single packaging material 10 in which the front film 74, the back film 75, and the lower film 76 are consecutively provided, or the front film 74 and the lower film 76 are consecutively provided. It may be manufactured using a total of two packaging materials 10, one packaging material 10 and one back film 75, one front film 74, one back film 75, and one bottom film 76. It may be manufactured using a total of three packaging materials 10.

At least one of the front film 74, the back film 75, and the lower film 76 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced compared to conventional methods, and the environmental impact can be reduced.

FIG. 6 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 6 differs only in that it further includes a steam release mechanism 80, and the other configurations are substantially the same as the packaging bag 70 shown in FIG. 5. In the packaging bag 70 shown in FIG. 6, the same parts as those in the packaging bag 70 shown in FIG.

As shown in FIG. 6, the packaging bag 70 includes a steam release mechanism 80 for releasing steam generated when heating the contents stored in the storage section 77 to the outside. The steam venting mechanism 80 communicates the inside and outside of the packaging bag 70 to release steam when the pressure of steam exceeds a predetermined value, and suppresses steam escaping from locations other than the steam venting mechanism 80. It is configured to do so.

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

Note that the configuration of the steam venting mechanism 80 is not limited to the configuration shown in FIG. 6. The structure of the steam venting mechanism 80 is arbitrary as long as it can communicate the storage section 77 with the outside of the packaging bag 70 when the pressure of steam reaches a predetermined value or higher.

Also in the packaging bag 70 shown in FIG. 6, at least one of the front film 74, the back film 75, and the lower film 76 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced compared to conventional methods, and the environmental impact can be reduced.

FIG. 7 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 7 differs only in that it further includes a spout part 85, and the other configurations are substantially the same as the packaging bag 70 shown in FIG. 5. In the packaging bag 70 shown in FIG. 7, the same parts as those in the packaging bag 70 shown in FIG.

As shown in FIG. 7, the packaging bag 70 is a part through which the contents are taken out from the storage section 77. In this case, the content is a fluid liquid or the like. The width of the spout portion 85 is narrower than the width of the accommodating portion 77. Therefore, the user can accurately determine the direction in which the contents are poured out from the packaging bag 70 through the spout portion 85.

In the example shown in FIG. 7, the spout part 85 is configured by a part of the front film 74 and the back film 75. For example, spout portion 85 includes a spout seal portion 86 that joins front film 74 and back film 75 to define spout portion 85 having a width narrower than storage portion 77 . The packaging bag 70 provided with such a spout portion 85 is suitably used as a refill pouch for accommodating contents such as detergent, shampoo, conditioner, etc. to be refilled into a bottle.

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

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

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

Also in the packaging bag 70 shown in FIG. 8, at least one of the front film 74 and the back film 75 is constituted by the packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced compared to conventional methods, and the environmental impact can be reduced.

Although not shown, the packaging bag 70 may be a three-sided seal pouch formed by joining a front film 74 and a back film 75 on three sides along the outer edges. Further, although not shown, the packaging bag 70 may be a pillow pouch joined at the upper part 71, the lower part 72, and the palms together.

FIG. 9 is a diagram showing an example of a lidded container 90 including the packaging material 10. The lidded container 90 includes a container body 92 manufactured 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, a container body 92 is produced by drawing and forming a packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced compared to conventional methods, and the environmental impact can be reduced.

Moreover, in the example shown in FIG. 9, the lid part 94 may be formed of the packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced compared to conventional methods, and the environmental impact can be reduced.

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

Next, the present invention will be explained in more detail with reference to examples, but the present invention is not limited to the description of the following examples unless it exceeds the gist thereof.

[Example 1A]
As the base film 22 of the base layer 20, a biaxially stretched fossil fuel-derived PET film (thickness: 12 μm) was prepared. Subsequently, a printing layer 50 was formed on the inner surface of the PET film using an ink containing a biomass-derived component. In the step of forming the printing layer 50, first, 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 prepared as a main ingredient. In addition, a fossil fuel-derived isocyanate compound was prepared as a curing agent. Subsequently, a colorant was added to a cured product of a polyester polyol containing a biomass-derived component and a fossil fuel-derived isocyanate compound to obtain an ink. Subsequently, ink was applied in a predetermined pattern to the inner surface of the polypropylene film to form a printed layer 50.

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

The layer structure of the packaging material 10 of this example is expressed as follows.
PET12/Bio Seal/Contact/PE(1)30
"/" represents 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 biaxially oriented PET film derived from fossil fuels.
"Bio-print" means a printed layer containing biomass-derived components.
"Contact" means a fossil fuel derived adhesive layer.
"PE(1)" means the above-mentioned polyethylene film 1.
The numbers refer to the layer thickness (in μm).

[Example 1B]
Packaging was carried out in the same manner as in Example 1A, except that a reaction product of a fossil fuel-derived polyfunctional alcohol and a polyfunctional carboxylic acid containing a biomass-derived component was used as the polyester polyol, which is the main ingredient of the printing layer 50. Material 10 was produced.

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

In Examples 1A to 1C, in the printing layer, one of the three components, the polyfunctional alcohol or polyfunctional carboxylic acid used in the polyester polyol as the main ingredient, or the isocyanate compound used in the curing agent, was made from biomass. Although an example of a derived component is shown, the present invention is not limited to this. For example, two of the three components may contain biomass-derived components, or all three components may contain biomass-derived components.

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

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

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

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

The layer structure of the packaging material 10 of this example is expressed as follows.
PET12/Bio seal/Bio contact/PE(1)30
"Biocontact" means an adhesive layer containing biomass-derived components.

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

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

In Examples 1G to 1I, one of the three components in the adhesive layer, the polyfunctional alcohol or polyfunctional isocyanate used in the polyester polyol as the main ingredient, or the isocyanate compound used in the curing agent, was made from biomass. Although an example of a derived component is shown, the present invention is not limited to this. For example, two of the three components may contain biomass-derived components, or all three components may contain biomass-derived components.

Furthermore, in Examples 1D to 1I, the adhesive layers shown in Examples 1B to 1F may be used as the printing layer 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 example is expressed as follows.
Bio PET12/Bio Seal/Bio Contact/PE(1)30
"Bio-PET" means PET film derived from biomass.

[Example 1K]
A packaging material 10 was produced in the same manner as in Example 1G, except that the polyethylene film 2 produced as described below was used as the sealant film 42 of the sealant layer 40.
A method for producing polyethylene film 2 will be explained. 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%) and fossil fuel-derived low-density polyethylene ( density: 0.924 g/cm ³ , MFR: 2.0 g/10 min, biomass degree: 0%) 20 parts by mass, and 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%) and 20 parts by mass were melt-kneaded to obtain a resin composition. Next, the obtained resin composition was formed into a film using a top-blown air-cooled inflation coextrusion film-forming machine to obtain a single-layer polyethylene film 2 (biomass content: 16%) for the sealant layer. The thickness of the polyethylene film 2 was 30 μm as in the case of the polyethylene film 1 of Example 1A.

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

[Example 1L]
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 the above-mentioned polyethylene film 2 was used as the sealant film 42 of the sealant layer 40. Packaging material 10 was produced in the same manner as in the case.

The layer structure of the packaging material 10 of this example is expressed as follows.
Bio PET12/Bio Seal/Bio Contact/PE(2)30

In addition, in Examples 1J to 1L, the printing layers shown in Examples 1B to 1F may be used as the printing layer in addition to the printing layer shown in Example 1A. Further, as the adhesive layer, in addition to the adhesive layer shown in Example 1G, the adhesive layers shown in Examples 1A to 1I may be used.

The layer structure of the packaging material 10 of Examples 1A to 1L is summarized in FIG. 10. In the column of "type of adhesive layer" in FIG. 10, the description "ether-based" means that the main ingredient used in the adhesive layer is polyether polyol.
In addition, in the column "Biomass-derived components in the adhesive layer," the statement "polyfunctional alcohol" indicates that at least the polyfunctional alcohol in the base resin is derived from biomass among the base resin and curing agent components used in the adhesive layer. It means something. 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. Furthermore, in the column of "biomass-derived component in adhesive", the description "-" means that the adhesive layer does not contain a biomass-derived component.

Similarly, in the column of "Printing layer type", the description "ether-based" means that the main ingredient used in the printing layer is polyether polyol. Moreover, the description "ester-based" means that the main ingredient used in the printing layer is polyester polyol. In addition, in the column of "Biomass-derived components in the printing layer," the statement "polyfunctional alcohol" indicates that at least the polyfunctional alcohol of the main ingredient among the ingredients of the main ingredient and curing agent used in the printing layer is derived from biomass. means. Similarly, the description "polyfunctional carboxylic acid" means that at least the polyfunctional carboxylic acid of the main ingredient among the main ingredient and curing agent components used in the printing 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 printing layer is derived from biomass.

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

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

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

[Example 2B]
The base film 22 is made of polypropylene in which a vapor-deposited layer of an inorganic oxide and a gas barrier coating film located on the vapor-deposited layer are provided on the surface of a biaxially stretched polypropylene film (thickness 20 μm) derived from fossil fuels. Packaging material 10 was produced in the same manner as in Example 2A except that a film was used.

The layer structure of the packaging material 10 of this example is expressed as follows.
Barrier OPP20/Bio Seal/Contact/PE(1)25
"Barrier OPP" means a polypropylene film in which a biaxially stretched fossil fuel-derived polypropylene film is provided with an inorganic oxide vapor deposition layer and a gas barrier coating film.

[Example 3]
Packaging material 10 was produced in the same manner as in Example 1A, except that a polypropylene film made of fossil fuel (20 μm thick) with a metal vapor deposition layer was used as sealant film 42. .

The layer structure of the packaging material 10 of this example is expressed as follows.
PET12/Bio Seal/Contact/VMCPP20
"VMCPP" means a fossil fuel-derived biaxially oriented polypropylene film provided with a deposited layer of metal.

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

The layer structure of the packaging material 10 of this example is expressed as follows.
OPP20/Bio Seal/Contact/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 example is expressed as follows.
PET12/Bio Seal/Contact/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 example is expressed as follows.
OPP20/Bio Seal/Contact/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 example is expressed as follows.
Barrier OPP20/Bio Seal/Contact/CPP20

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

The layer structure of the packaging material 10 of this example is expressed as follows.
PET20/Bio Seal/Contact/CNY60
"CNY" means fossil fuel derived nylon film.

[Example 8]
The base film 22 is a biaxially stretched PET film (thickness 12 μm) derived from fossil fuel, which is provided with an inorganic oxide vapor deposition layer and a gas barrier coating film located on the vapor deposition layer. A packaging material 10 was produced in the same manner as in Example 1A, except that 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 example is expressed as follows.
IB-PET12/Bio Seal/Contact/CPP25
"IB-PET" means 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 the polyethylene film 1 with a thickness of 40 μm was used as the sealant film 42.

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

In the packaging materials of Examples 2A to 9 described so far, the printed layers shown in Examples 1B to 1F may be used instead of those used in Example 1A. Further, as the adhesive layer, other than the adhesive layer used in Example 1A, variations similar to those in Examples 1B to 1L may be adopted.

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

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

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

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

In Examples 10 and 11, the printed layers shown in Examples 1B to 1F may be used instead of those used in Example 1A. Further, as the printing layer, other than that used in Example 1A, variations similar to those in Examples 1B to 1L may be adopted.

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

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

Claims (7)

A packaging material comprising a base layer , a printing layer , an adhesive layer , a barrier layer, and a sealant layer in this order ,
The printing layer includes a cured product of a polyol and an isocyanate compound, and at least either the polyol or the isocyanate compound includes a biomass-derived component,
The polyol of the printing layer is a polyester polyol of a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid,
Of the polyfunctional alcohol and the polyfunctional carboxylic acid of the printing layer, one contains a biomass-derived component and the other is derived from fossil fuel,
The printing layer has a thickness of 0.1 μm or more and 10 μm or less,
The thermoplastic resin constituting the sealant layer is derived from fossil fuel,
A packaging material, wherein the thermoplastic resin includes polypropylene or a propylene-ethylene copolymer. The packaging material according to claim 1, wherein the isocyanate compound of the printing layer includes a biomass-derived component. The packaging material according to claim 1 or 2, wherein the base layer has a base film containing polyethylene terephthalate or polypropylene . The packaging material according to any one of claims 1 to 3, wherein the barrier layer is a vapor-deposited layer of an inorganic substance or an inorganic oxide. The packaging material according to any one of claims 1 to 4, wherein the adhesive layer includes a cured product of a polyol and an isocyanate compound. The packaging material according to claim 5, wherein the polyol of the adhesive layer is a polyether polyol that is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate. A packaging product comprising the packaging material according to any one of claims 1 to 6 .