JP7271894B2 - Packaging materials and packaging products - Google Patents

Description

The present invention relates to packaging materials containing biomass-derived components and packaged products comprising the packaging materials.

BACKGROUND ART Conventionally, various packaging materials have been developed and proposed as packaging materials for constituting packaging products for filling and packaging various articles such as food and drink, pharmaceuticals, chemicals, cosmetics, sanitary goods, daily necessities, and the like. The packaging material is composed of a laminate including at least a substrate layer and a printed layer for forming a printed pattern.

In recent years, along with the increasing demand for building a recycling-oriented society, the use of biomass has attracted attention in the field of laminates that make up packaging materials, as well as in the field of energy. there is Biomass is an organic compound that is photosynthesised from carbon dioxide and water, and is a so-called carbon-neutral renewable energy that is regenerated into carbon dioxide and water by using it. In recent years, biomass plastics using biomass as raw materials have been rapidly put to practical use, and attempts have been made to produce various resins from biomass raw materials.

As a biomass-derived resin, polylactic acid (PLA), which is produced through lactic acid fermentation, began commercial production first, but its performance as a plastic, including its biodegradability, has fallen behind that of today's general-purpose plastics. Since it is very different from the standard, it has not been widely used due to limitations in product applications and product manufacturing methods. In addition, PLA is subjected to Life Cycle Assessment (LCA) evaluation, and discussions are being made on energy consumption during PLA production and equivalence when replacing general-purpose plastics.

Here, as general-purpose plastics, various types such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester are used. In particular, polyethylene is molded into films, sheets, bottles, etc., and is used in various applications such as packaging materials, and is widely used around the world. Therefore, the use of conventional fossil fuel-derived polyethylene imposes a large environmental load. Therefore, it is desired to reduce the consumption of fossil fuels by using biomass-derived raw materials for the production of polyethylene. For example, until now, research has been conducted to produce ethylene and butylene, which are raw materials for polyolefin resin, from renewable natural raw materials (see Patent Document 1). In the field of flexible packaging such as pouches, it has been proposed to apply such biomass-derived raw materials to packaging materials (see Patent Document 2).

Japanese Patent Publication No. 2011-506628 JP 2018-51788 A

Also in the field of packaging materials for paper containers containing a paper substrate layer, it is desired to use biomass-derived raw materials to reduce the amount of fossil fuels used.

The present invention has been made in consideration of such points, and an object of the present invention is to provide a packaging material for paper containers with an increased degree of biomass.

The present invention is a packaging material in which at least a surface protective layer, a printed layer, and a paper base layer are laminated in order, and the surface protective layer is a reaction product of a polyol, an isocyanate compound, and a hydroxy(meth)acrylate. The packaging material contains urethane (meth)acrylate, and at least one of the polyol, the isocyanate compound, and the hydroxy (meth)acrylate contains a biomass-derived component.

In the packaging material according to the present invention, the polyol may contain a biomass-derived component.

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

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

According to the present invention, the biomass content of a packaging material containing a paper base layer can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the packaging material by the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the packaging material by the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the packaging material by the 1st Embodiment of this invention. 1 is a diagram showing an example of a packaging container provided with packaging material according to a first embodiment of the invention; FIG. It is a figure which expands and shows the packaging container shown in FIG. 1 is a diagram showing an example of a packaging container provided with packaging material according to a first embodiment of the invention; FIG. FIG. 4 is a cross-sectional view showing an example of packaging material according to a second embodiment of the present invention; FIG. 4 is a cross-sectional view showing an example of packaging material according to a second embodiment of the present invention; FIG. 4 is a cross-sectional view showing an example of packaging material according to a second embodiment of the present invention; FIG. 4 is a cross-sectional view showing an example of packaging material according to a second embodiment of the present invention; FIG. 5 shows an example of a packaging container provided with a packaging material according to a second embodiment of the invention; FIG. 10 is a cross-sectional view showing an example of packaging material according to a third embodiment of the present invention; FIG. 10 is a cross-sectional view showing an example of packaging material according to a third embodiment of the present invention; FIG. 10 shows an example of a packaging container provided with packaging material according to a third embodiment of the invention; FIG. 15 is a plan view showing an example of a blank plate for producing the packaging container shown in FIG. 14; FIG. 2 shows the layer structure of the packaging materials of Examples 1A-1H. FIG. 2 shows the layer structure of the packaging materials of Examples 1I-1P. FIG. 2 shows the layer structure of the packaging materials of Examples 1 and 2A-10.

The laminate constituting the packaging material according to the present invention comprises at least a surface protective layer, a printed layer and a paper substrate layer laminated in order from the outer surface side to the inner surface side. The inner surface is the surface of a packaged product formed from the packaging material that faces the contents contained in the packaged product. Further, the outer surface is a surface located on the opposite side of the inner surface. In the present application, the term "order" in descriptions such as "provided in this order" and "layered in order" indicates the order in the direction from the outer surface side to the inner surface side unless otherwise specified.

In the present invention, the biomass degree described below is preferably 40% or more, more preferably 80% or more and less than 100%, in the entire laminate constituting the packaging material. If the degree of biomass is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

First Embodiment FIG. 1 is a sectional view showing an example of packaging material 20 according to a first embodiment of the present invention. The packaging material 20 includes a surface protective layer 11, a printed layer 12, and a paper base layer 13 in this order. The surface protective layer 11 constitutes the outer surface 20y of the packaging material 20, and the paper base layer 13 constitutes the inner surface 20x of the packaging material 20. As shown in FIG.

FIG. 2 is a cross-sectional view showing another example of the packaging material 20 according to the first embodiment of the invention. The packaging material 20 includes at least a surface protective layer 11, a printed layer 12, a paper base layer 13, and a sealant layer 22 in this order. The surface protective layer 11 constitutes the outer surface 20y of the packaging material 20, and the sealant layer 22 constitutes the inner surface 20x of the packaging material 20. As shown in FIG.

FIG. 3 is a cross-sectional view showing another example of the packaging material 20 according to the first embodiment of the invention. The packaging material 20 includes at least a surface protective layer 11, a printed layer 12, a paper base layer 13, an adhesive resin layer 24, a metal foil 23, an adhesive resin layer 25, and a sealant layer 22 in this order. . The surface protective layer 11 constitutes the outer surface 20y of the packaging material 20, and the sealant layer 22 constitutes the inner surface 20x of the packaging material 20. As shown in FIG.

It should be noted that it is also possible to appropriately combine a plurality of layer configurations of the packaging material 20 shown in FIGS. 1 to 3 described above.

Each layer constituting the packaging material 20 will be described below.

(Paper base layer)
The paper base layer 13 is a layer containing paper. The paper base layer 13 has a basis weight of 100 g/m ² or more and 700 g/m ² or less, preferably 150 g/m ² or more and 600 g/m ² or less, more preferably 200 g/m ² or more and 500 g/m ^{2 or} less. As the paper base layer 13, white paperboard in general can be used, but ivory paper, milk carton base paper, cup base paper, etc. using natural pulp are particularly preferable from the viewpoint of safety.

The paperboard may use neutral rosin, alkyl ketene dimer, alkenyl succinic anhydride as a sizing agent, and cationic polyacrylamide, cationic starch, etc. as a fixing agent. Moreover, it is also possible to make paper in a neutral range of pH 6 or more and pH 9 or less using aluminum sulfate. In addition to the above sizing agents as necessary, fixing agents, various fillers for papermaking, retention improvers, dry strength enhancers, wet strength enhancers, binders, dispersants, flocculants, plasticizers Agents and adhesives may be contained as appropriate.

(Print layer)
The printed layer 12 is a layer formed by printing for decoration, display of contents, display of best-before date, display of manufacturer, seller, etc., and addition of aesthetics. The print layer 12 includes a pattern layer that forms any desired pattern such as pictures, photographs, letters, numbers, figures, symbols, and patterns. The printed layer may further include a ground color layer formed by printing so as to make the pattern of the pattern layer stand out.

In this embodiment, the print layer 12 is formed by UV offset printing. The print layer 12 contains a coloring agent and a binder resin. The ink composition for forming the printing layer 12 contains a solvent suitable for UV offset printing in addition to the colorant and binder resin.

[Coloring agent]
The coloring agent is not particularly limited, and conventionally known pigments and dyes can be used.

[Binder resin]
The binder resin contains urethane (meth)acrylate which is a reaction product of polyol, isocyanate compound and hydroxy (meth)acrylate. Polyols, isocyanate compounds or hydroxy(meth)acrylates may or may not contain biomass-derived components. In the following description, urethane (meth)acrylate containing a biomass-derived component is also referred to as biourethane (meth)acrylate.

Urethane (meth)acrylates are obtained, for example, by reacting polyols and isocyanates with hydroxy (meth)acrylates. In biourethane (meth)acrylate, a plant-derived polyol can be used as the polyol, a plant-derived isocyanate can be used as the isocyanate, or both the polyol and the isocyanate can be plant-derived.

Polyols include polyester polyols that are reaction products of polyfunctional alcohols and polyfunctional carboxylic acids, polyether polyols that are reaction products of polyfunctional alcohols and polyfunctional isocyanates, and reaction products of polyfunctional alcohols and carbonates. Certain polycarbonate polyols can be used. Each polyol will be described below.

<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. Examples of polyester polyols containing biomass-derived components include the following.
・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 ・Biomass-derived polyfunctional alcohol and fossil fuel-derived reactant with polyfunctional carboxylic acid

As polyfunctional alcohols derived from biomass, 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 obtained from plant materials by the following methods. There are glycol (BG), hexamethylene glycol, etc., and any of them can be used. These may be used alone or in combination.

Biomass-derived polypropylene glycol is produced from glycerol via 3-hydroxypropylaldehyde (HPA) by a fermentation process in which the plant material is degraded to yield glucose. Compared with polypropylene glycol produced by the EO production method, polypropylene glycol produced by a bio-method such as the fermentation method yields useful by-products such as lactic acid from the standpoint of safety, and the production cost can be kept low. It is also preferred that it is possible.
Biomass-derived butylene glycol can be produced by producing succinic acid obtained by producing and fermenting glycol from a plant raw material, and then hydrogenating the succinic acid.
Biomass-derived ethylene glycol can be produced, for example, from bioethanol obtained by a conventional method via ethylene.

As polyfunctional alcohols derived from fossil fuels, compounds having 2 or more, preferably 2 to 8 hydroxyl groups in one molecule can be used. Specifically, polyfunctional alcohols derived from fossil fuels are 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 polyols, polycarbonate polyols, polyolefin polyols, acrylic polyols, and the like 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, and the recycling of waste edible oils, etc. Aliphatic polyfunctional carboxylic acids obtained from plant sources 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 with heptyl alcohol as a by-product by alkaline thermal decomposition of ricinoleic acid obtained from castor oil. 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.

Aliphatic polyfunctional carboxylic acids and aromatic polyfunctional carboxylic acids can be used as polyfunctional carboxylic acids derived from fossil fuels. Aliphatic polyfunctional carboxylic acids derived from fossil fuels are not particularly limited and conventionally known substances can be used. For example, adipic acid, dodecanedioic acid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, maleic anhydride acid, itaconic anhydride, sebacic acid, succinic acid, glutaric acid, dimer acid, and ester compounds thereof; In addition, the aromatic polyfunctional carboxylic acid derived from fossil fuels is not particularly limited and conventionally known substances can be used. Examples include isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, phthalic anhydride, trimellitic acid, and pyromellitic acid, and their ester compounds and the like 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. Examples of polyether polyols containing biomass-derived components include the following.
・Reaction products of biomass-derived polyfunctional alcohols and biomass-derived polyfunctional isocyanates ・Reaction products of fossil fuel-derived polyfunctional alcohols and biomass-derived polyfunctional isocyanates ・Biomass-derived polyfunctional alcohols and fossil fuel-derived polyfunctional Reactants with functional isocyanates

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

As a biomass-derived polyfunctional isocyanate, a plant-derived divalent carboxylic acid is acid-amidated, converted to a terminal amino group by reduction, and further reacted with phosgene to convert the amino group to an isocyanate group. What is obtained can be used. The biomass-derived polyfunctional isocyanate is, for example, a biomass-derived diisocyanate. Biomass-derived diisocyanates include dimer acid diisocyanate (DDI), octamethylene diisocyanate, decamethylene diisocyanate, and the like. A plant-derived diisocyanate can also be obtained by using a plant-derived amino acid as a raw material and converting the 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. Also, 1,5-pentamethylene diisocyanate can be obtained by decarboxylating the carboxyl group of lysine and then converting the amino group to an isocyanate group.

Other methods for synthesizing 1,5-pentamethylene diisocyanate include phosgenation and carbamate methods. More specifically, the phosgenation method includes a method in which 1,5-pentamethylenediamine or a salt thereof is reacted directly with phosgene, and a hydrochloride of pentamethylenediamine suspended in an inert solvent and reacted with phosgene. 1,5-pentamethylene diisocyanate is synthesized by the method. In the carbamate conversion method, first, 1,5-pentamethylenediamine or a salt thereof is carbamate to form pentamethylenedicarbamate (PDC), which is then thermally decomposed to produce 1,5-pentamethylenediisocyanate. Synthesis. Polyisocyanates that are preferably used in the present invention include 1,5-pentamethylene diisocyanate-based polyisocyanates (trade name: STABIO (registered trademark)) manufactured by Mitsui Chemicals, Inc.

The polyfunctional isocyanate derived from fossil fuels is not particularly limited, and conventionally known substances can be used. 1,3-phenylene diisocyanate, 4-chloro-1,3-phenylene diisocyanate, 4-butoxy-1,3-phenylene diisocyanate, 2,4-diisocyanatodiphenyl ether, 4,4′-methylenebis(phenylene isocyanate) (MDI), Aromatic diisocyanates such as dulylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, 4,4′-diisocyanate dibenzyl, and the like. In addition, aliphatic diisocyanates such as methylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, and 1,10-decamethylene diisocyanate; 1,4-cyclohexylene diisocyanate, 4,4-methylenebis(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.

<Polycarbonate polyol>
When the polycarbonate polyol contains a biomass-derived component, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a fossil fuel-derived carbonate can be used as the polycarbonate polyol. Carbonates include, for example, dimethyl carbonate, dipropyl carbonate, diethyl carbonate, diethylene carbonate, dibutyl carbonate, ethylene carbonate, diphenyl carbonate and the like. These can be used alone or in combination of two or more.

As the biomass-derived polyfunctional alcohol, the biomass-derived polyfunctional alcohol described in the above polyester polyol can be used.

<Isocyanate compound>
Next, the isocyanate compound will be explained. As the isocyanate compound containing a biomass-derived component, the biomass-derived polyfunctional isocyanate described for the polyether polyol can be used.

<Hydroxy (meth)acrylate>
Next, hydroxy (meth) acrylate will be explained. Hydroxy (meth) acrylates include (meth) acryloyl groups such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, and 2-hydroxy-3-phenoxypropyl (meth) acrylate. Hydroxy (meth) acrylates; glycerin di (meth) acrylate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, sorbitol penta (meth) acrylate, etc. ( Hydroxy(meth)acrylates having two or more meth)acryloyl groups, and the like. Each of these may be used alone, or two or more of them may be used in combination.

The print layer 12 preferably has a biomass degree of 5% or more, more preferably 5% or more and 50% or less, and still more preferably 10% or more and 50% or less. If the degree of biomass 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 12 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, still more preferably 1 g/m 2 or ^more and 3 g/m 2 or more. ² or less. The print layer 12 preferably has a thickness of 0.1 μm or more and 10 μm or less, more preferably 0.5 μm or more and 5 μm or less, and still more preferably 0.7 μm or more and 3 μm or less. A plurality of print layers 12 having such weight and thickness may be provided.

The “biomass degree” is, for example, a value obtained by measuring the content of biomass-derived carbon by radiocarbon (C14) measurement.

When the value obtained by measuring the content of biomass-derived carbon by radioactive carbon (C14) measurement is indicated as the "biomass degree", the "biomass degree" can be obtained as follows. That is, since carbon dioxide in the atmosphere contains a certain proportion of C14 (105.5 pMC), the C14 content in plants that grow by taking in carbon dioxide in the atmosphere, such as corn, is also about 105.5 pMC. is known to be It is also known that fossil fuels contain almost no C14. Therefore, by measuring the ratio of C14 contained in the total carbon atoms in the polyester, the ratio of biomass-derived carbon can be calculated. When the content of C14 in the printed layer 12 is defined as P _C14 , the biomass-derived carbon content P _bio can be obtained as follows.
P _bio (%) = P _C14 /105.5 x 100

Also, the “biomass degree” may be the weight ratio of biomass-derived components. Hereinafter, unless otherwise specified, the “biomass degree” indicates the weight ratio of biomass-derived components.

(Surface protective layer)
The surface protective layer 11 is a layer that protects the printed layer 12 . The surface protective layer 11 may be provided so as to be in contact with the printed layer 12 . The surface protective layer 11 is formed by applying a paint containing solids and a solvent. As the solid content of the paint, the same material as the binder resin of the print layer 12 can be used. Therefore, the structure of the surface protective layer 11 is the same as that of the printed layer 12 except that it does not contain a coloring agent.

For example, the surface protective layer 11 contains urethane (meth)acrylate which is a reaction product of polyol, isocyanate compound and hydroxy (meth)acrylate. Moreover, the surface protective layer 11 contains a biomass-derived component. For example, at least one of the polyol, isocyanate compound, and hydroxy(meth)acrylate in the urethane (meth)acrylate of the surface protective layer 11 contains a biomass-derived component. As the polyol, isocyanate compound and hydroxy(meth)acrylate, the polyol, isocyanate compound and hydroxy(meth)acrylate described for the print layer 12 can be used.

The surface protective layer 11 preferably has a biomass degree of 5% or more, more preferably 5% or more and 50% or less, still more preferably 10% or more and 50% or less. If the degree of biomass 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 surface protective layer 11 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, still more preferably 1 g/m 2 or more and 3 g/m ² or more. ^m2 or less. The surface protective layer 11 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, still more preferably 1 μm or more and 3 μm or less.

(sealant layer)
The sealant layer 22 may contain a biomass-derived component or may not contain a biomass-derived component. When the sealant layer 22 is formed from a material containing a biomass-derived component, the sealant layer 22 can be formed using the following biomass polyolefin. Further, when the sealant layer 22 is formed of a material that does not contain biomass-derived components, the sealant layer 22 can be formed using a conventionally known fossil fuel-derived thermoplastic resin.

Biomass polyolefins are polymers of monomers containing olefins such as ethylene derived from biomass. Since biomass-derived olefins are used as raw material monomers, the polymerized polyolefins are biomass-derived. Note that the polyolefin raw material monomer 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 biomass-derived fermented ethanol obtained from plant raw materials. Plant raw materials are not particularly limited, and conventionally known plants can be used. For example, corn, sugar cane, beets, and manioc can be mentioned.

Biomass-derived fermented ethanol refers to ethanol produced by contacting a culture solution containing a carbon source obtained from a plant material with a microorganism that produces ethanol or a product derived from a crushed product thereof, followed by purification. Conventionally known methods such as distillation, membrane separation, and extraction can be applied to purify ethanol from the culture medium. For example, a method of adding benzene, cyclohexane or the like to cause azeotropy or removing water by membrane separation or the like can be mentioned.

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.

Although the number of carbon atoms of the α-olefin is not particularly limited, those having 3 to 20 carbon atoms can usually be used, and preferably butylene, hexene, or octene. This is because butylene, hexene, or octene can be produced by polymerization of ethylene, which is a raw material derived from biomass. In addition, by containing such an α-olefin, the polymerized polyolefin has alkyl groups as a branched structure, so that it can be made more flexible than a simple straight-chain polyolefin.

As the biomass polyolefin, polyethylene or a copolymer of ethylene and α-olefin may be used alone, or two or more of them may be mixed and used. In particular, the biomass polyolefin is preferably polyethylene. This is because the use of ethylene, which is a biomass-derived raw material, theoretically enables production from 100% biomass-derived components.

The biomass polyolefin may contain two or more biomass polyolefins with different biomass degrees, and the biomass degree of the polyolefin resin layer as a whole may be within the range described later.

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, still more preferably 0.915 g/cm 3 or more and 0.928 g/cm ³ or more. It has a density of 0.925 g/cm ³ or less. The density of biomass polyolefin is a value measured according to the method specified in A method of JIS K7112-1980 after annealing according to JIS K6760-1995. If the biomass polyolefin has a density of 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 packaging products. Also, if the density of the biomass polyolefin is 0.93 g/cm ³ or less, the transparency and mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be enhanced, and it can be suitably used as the inner layer of packaging products.

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, 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 enhanced.

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

Examples of the above 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 copolymers, ethylene-methacrylic acid copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-methyl methacrylate copolymers, ionomers and the like can be mentioned.

The sealant layer 22 preferably has a biomass degree of 5% or more, more preferably 10% or more and 95% or less. If the degree of biomass is within the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

The sealant layer 22 may be a single layer or multiple layers. When biomass polyolefin as described above is used for the sealant layer, the sealant layer may have three layers, an inner layer, an intermediate layer and an outer layer. In that case, the intermediate layer may be a layer made of biomass polyolefin or a layer made of a mixture of biomass polyolefin and conventionally known fossil fuel-derived polyolefin, and the inner and outer layers may be made of conventionally known fossil fuel-derived polyolefin. preferable.

The sealant layer 22 preferably has a thickness of 10 μm to 300 μm, more preferably 20 μm to 200 μm, even more preferably 30 μm to 150 μm.

(metal foil)
The metal foil 23 is a member obtained by rolling metal. A conventionally known metal foil can be used as the metal foil 23 . Aluminum foil is preferable from the viewpoint of gas barrier properties that prevent permeation of oxygen gas and water vapor, and light shielding properties that prevent permeation of visible light, ultraviolet rays, and the like.

(Adhesive resin layer)
The adhesive resin layer is a layer provided when any two layers are adhered. The adhesive resin layer 24 is a layer that bonds the paper substrate layer 13 and the metal foil 23 together, and the adhesive resin layer 25 is a layer that bonds the metal foil 23 and the sealant layer 22 together.

The adhesive resin layer can be formed by a conventionally known method such as a melt extrusion lamination method or a sand lamination method. Thermoplastic resins that can be used for the adhesive resin layer include polyethylene-based resins, polypropylene-based resins, cyclic polyolefin-based resins, or copolymer resins, modified resins, or mixtures (including alloys) containing these resins as main components. ) can be used. Polyolefin resins include, for example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), metallocene catalyst Ethylene-α-olefin copolymer, ethylene-polypropylene random or block copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-α-olefin copolymer polymerized using Ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, ionomer resin, adhesion between layers In order to improve the above, it is possible to use an acid-modified polyolefin resin obtained by modifying the above polyolefin resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, or itaconic acid. can. Further, a resin obtained by graft polymerization or copolymerization of an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer can be used as the polyolefin resin. These materials can be used singly or in combination of two or more. Cyclic polyolefins such as ethylene-propylene copolymers, polymethylpentene, polybutene, and polynorbonene can be used as cyclic polyolefin resins. These resins can be used singly or in combination. As the polyethylene-based resin described above, the biomass content can be further improved by using the above-described biomass-derived ethylene as a monomer unit.

When the adhesive resin layer is laminated by the melt extrusion lamination method, an anchor coat layer formed by applying an anchor coat agent and drying it may be provided on the surface of the layer to be laminated. The anchor coating agent includes any resin having a heat resistance temperature of 135° C. or higher, such as an anchor coating agent made of vinyl-modified resin, epoxy resin, urethane resin, polyester resin, polyethyleneimine, etc. Especially, An anchor coating agent which 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. In addition, a silane coupling agent may be used together as an additive, and nitrocellulose may be used together 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 resin 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.

(Manufacturing method of packaging material)
Next, an example of a method for manufacturing a laminate that constitutes the packaging material 20 will be described.

First, the paper base layer 13 described above is prepared. Subsequently, the ink composition described above is applied onto the paper base layer 13 by offset printing, and the ink composition on the paper base layer 13 is irradiated with ultraviolet rays to form the printed layer 12 on the paper base layer 13. Form. Subsequently, the above paint containing solids and solvent is applied onto the printed layer 12, and the paint on the printed layer 12 is irradiated with ultraviolet rays to form the surface protective layer 11 on the printed layer 12. As a result, the packaging material 20 including the surface protective layer 11, the printed layer 12 and the paper base layer 13 can be obtained. As a method of applying the paint, an offset method or the like can be used.

<Packaging products>
An example of a packaged product formed by using packaging material 20 will now be described. FIG. 4 is a diagram showing a heat insulating container 50 having heat insulating properties. The left half and right half of FIG. 4 show a cross-sectional view and a front view of the heat insulating container 50, respectively. The heat insulating container 50 of FIG. 4 includes a paper cup body 51 and an outer cylinder 52 that covers the body of the paper cup body 51 . The outer cylinder 52 has a hollow cylindrical shape with upper and lower openings. This outer cylinder 52 is an example of a packaged product 20A formed by using the packaging material 20 shown in FIG. The paper cup body 51 and the outer cylinder 52 are partially joined with an adhesive 53 .

FIG. 5 is an enlarged view of the heat insulating container 50. As shown in FIG. As shown in FIG. 5, a gap 54 is formed between the body of the paper cup body 51 and the outer cylinder 52 . This gap 54 can suppress the heat of the contents contained in the paper cup main body 51 from being transmitted to the outer cylinder 52 . Examples of contents include ramen, miso soup, and soup.

6 is a partially cutaway perspective view of the paper cup 55. FIG. The paper cup 55 includes a body portion 56 having a body portion 57 and a flange portion 58 and a bottom portion 59 . This body portion 56 is an example of a packaged product 20A formed by using the packaging material 20 shown in FIG. 2 or FIG. Examples of contents contained in the paper cup 55 include confectionery, ice cream, jelly, paper cups for vending machines, and the like.

By configuring the packaged product 20A using the packaging material 20 having the surface protective layer 11 containing the biomass-derived component, it is possible to reduce the amount of fossil fuel used compared to the conventional method. This can reduce the environmental load.

Second Embodiment Next, a second embodiment of the present invention will be described. In the second embodiment, the same reference numerals are assigned to the same parts as in the first embodiment, and detailed description thereof will be omitted. Further, when it is clear that the effects obtained in the first embodiment can also be obtained in the present embodiment, the explanation thereof may be omitted.

FIG. 7 is a cross-sectional view showing an example of the packaging material 30 according to the second embodiment of the invention. The packaging material 30 comprises a surface protective layer 11 , a printed layer 12 and a paper base layer 13 which are laminated in order, and a surface layer 14 located on the surface protective layer 11 . In the example shown in FIG. 7, surface layer 14 is partially located on surface protective layer 11 . The surface layer 14 is a layer formed by foil stamping, for example. In this case, the surface layer 14 includes at least an adhesive layer, a metal film, and a release layer in order from the surface protective layer 11 side. Although not shown, the surface layer 14 may also be formed on the surface protective layer 11 of the packaging material shown other than FIG.

FIG. 8 is a cross-sectional view showing another example of the packaging material 30 according to the second embodiment of the invention. The packaging material 30 includes a surface protective layer 11, a printed layer 12, a paper base layer 13, and a cardboard layer 31 in this order. The surface protective layer 11 constitutes the outer surface 30y of the packaging material 30, and the cardboard layer 31 constitutes the inner surface 30x of the packaging material 30. As shown in FIG.

FIG. 9 is a cross-sectional view showing another example of the packaging material 30 according to the second embodiment of the invention. The packaging material 30 includes a surface protective layer 11, a printed layer 12, a paper base layer 13, an adhesive layer 33, and a vapor deposited film 32 in this order. The surface protective layer 11 constitutes the outer surface 30y of the packaging material 30, and the vapor-deposited film 32 constitutes the inner surface 30x of the packaging material 30. As shown in FIG.

FIG. 10 is a cross-sectional view showing another example of the packaging material 30 according to the second embodiment of the invention. The packaging material 30 includes a surface protective layer 11, a printed layer 12, a paper base layer 13, an adhesive resin layer 34, and a vapor deposited film 32 in this order. The surface protective layer 11 constitutes the outer surface 30y of the packaging material 30, and the vapor-deposited film 32 constitutes the inner surface 30x of the packaging material 30. As shown in FIG.

Each layer constituting the packaging material 30 will be described below.

(Surface protective layer, printed layer, paper base layer)
As the surface protective layer 11, the printed layer 12, and the paper base layer 13, the surface protective layer 11, the printed layer 12, and the paper base layer 13 described in the first embodiment can be used.

(cardboard layer)
The corrugated board layer 31 is a layer having corrugated corrugated paper (flutes) and a cover and a backing paper attached to the flutes, and is a so-called corrugated board. The cardboard layer 31 is bonded to the paper base layer 13 . As the corrugated board layer 31, a G stage having a G flute with a step height of about 0.5 mm, an F stage having an F flute with a floor height of about 0.6 mm, or the like can be used.

(deposited film)
The deposited film 32 includes a substrate and a deposited film deposited on the substrate. The deposited film is located on the outer surface side of the substrate.

The substrate is a plastic film. Various plastics such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester can be used as the material of the plastic film. The substrate may contain a biomass-derived component or may not contain a biomass-derived component.

When the substrate contains a biomass-derived component, the substrate can be formed using the following biomass polyester or biomass polyethylene.

The biomass polyester has biomass-derived ethylene glycol as a diol unit and fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. In addition to the biomass polyester, the base material may further contain a fossil fuel-derived polyester having a fossil fuel-derived ethylene glycol as a diol unit and a fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit.

When the substrate contains a biomass-derived component, the degree of biomass in the substrate is 5% or more, preferably 10% or more and 30% or less, more preferably 15% or more and 25% or less. If the degree of biomass in the base material is 5% or more, the amount of polyester derived from fossil fuels can be reduced compared to conventional methods, and the environmental load can be reduced.

Biomass-derived ethylene glycol is produced from biomass-derived ethanol (biomass ethanol). For example, biomass-derived ethylene glycol can be obtained by a method in which biomass ethanol is converted into ethylene glycol via ethylene oxide by a conventionally known method. Also, commercially available biomass ethylene glycol may be used, and for example, biomass ethylene glycol commercially available from India Glycol can be preferably used.

The dicarboxylic acid unit of biomass polyester uses the dicarboxylic acid derived from a fossil fuel. As dicarboxylic acids, 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. 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. Ester etc. are mentioned. Among these, terephthalic acid is preferred, and dimethyl terephthalate is preferred as the aromatic dicarboxylic acid derivative.

Further, as the aliphatic dicarboxylic acid, specifically, oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, cyclohexanedicarboxylic acid, etc., usually having 2 to 40 carbon atoms. chain or alicyclic dicarboxylic acids. In addition, as derivatives of aliphatic dicarboxylic acids, 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 are used. 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. More preferred derivatives of aliphatic dicarboxylic acids are methyl esters of adipic acid and succinic acid, or mixtures thereof. These dicarboxylic acids may be used alone or in combination of two or more.

The biomass polyester may be a copolymerized polyester obtained by adding a copolymerized component as a third component in addition to the above diol component and dicarboxylic acid component. Specific examples of copolymer components include bifunctional oxycarboxylic acids, trifunctional or higher polyhydric alcohols for forming a crosslinked structure, trifunctional or higher polycarboxylic acids and/or their anhydrides, and 3 At least one polyfunctional compound selected from the group consisting of functional or higher oxycarboxylic acids is included. Among these copolymerization components, a bifunctional and/or trifunctional or higher oxycarboxylic acid is particularly preferably used because a copolyester having a high degree of polymerization tends to be easily produced. Among them, the use of a tri- or higher functional oxycarboxylic acid is most preferable because a polyester with a high degree of polymerization can be easily produced with a very small amount without using a chain extender to be described later.

A biomass polyester can be obtained by a conventionally known method of polycondensing the above-described diol units and dicarboxylic acid units. Specifically, after performing the esterification reaction and / or transesterification reaction of the dicarboxylic acid component and the diol component, a general method of melt polymerization such as performing a polycondensation reaction under reduced pressure, or an organic solvent can be produced by a known solution heating dehydration condensation method using The amount of diol used in the production of biomass polyester is substantially equimolar with respect to 100 mol of dicarboxylic acid or derivative thereof, but generally 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 there is a distillate in the middle.

A resin composition of biomass polyester or a resin composition containing biomass polyester and fossil fuel-derived polyester can be used to form a substrate, for example, by forming a film by a T-die method. Specifically, after drying the above 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 material can be formed by extruding a sheet from a die such as a T-die and rapidly cooling and solidifying the extruded sheet with 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, or the like can be used depending on the purpose.

Biomass polyethylene is a monomer polymer containing ethylene derived from biomass. As the biomass-derived ethylene, the biomass-derived ethylene described in the sealant layer 22 of the first embodiment can be used.

When the substrate is made of a material that does not contain biomass-derived components, examples of the plastic film constituting the substrate include polyester films such as polyethylene terephthalate film and polybutylene terephthalate film, polyolefin films such as polyethylene film and polypropylene film, Alternatively, a plastic film such as a polypropylene/ethylene-vinyl alcohol copolymer co-extruded co-stretched film or a composite film obtained by laminating two or more of these films can be used.

As the vapor deposition film, for example, a vapor deposition film of metal such as aluminum (Al) or lead (Pb) can be used.

(adhesive layer)
An adhesive layer is a layer provided when adhering arbitrary two layers. The adhesive layer 33 in FIG. 9 is a layer that bonds the paper substrate layer 13 and the vapor deposition film 32 together. The adhesive layer 33 contains a cured product of polyol and isocyanate compound.

The adhesive layer 33 may contain a biomass-derived component. In the adhesive layer 33 containing a biomass-derived component, at least either polyol or isocyanate compound contains a biomass-derived component.

As the isocyanate compound containing a biomass-derived component in the adhesive layer, the same isocyanate compound containing a biomass-derived component as in the print layer 12 can be used. Moreover, in the adhesive layer, as the polyol containing the biomass-derived component, the same polyol as that for the print layer 12 can be used. When both the printed layer 12 and the adhesive layer are formed using a cured product containing a biomass-derived component, the cured product in the printed layer 12 and the cured product in the adhesive layer may have the same composition or may have different compositions. Composition is also acceptable.

The adhesive layer 33 preferably has a biomass degree of 5% or more, more preferably 5% or more and 50% or less, still more preferably 30% or more and 50% or less. If the degree of biomass 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 33 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, still more preferably 2 g/m 2 or more and 5 g/m ² or more. ^m2 or less.

The adhesive layer 33 preferably has a thickness of 0.1 μm to 10 μm, more preferably 1 μm to 6 μm, even more preferably 2 μm to 5 μm.

(Adhesive resin layer)
The adhesive resin layer is a layer provided when any two layers are adhered. The adhesive resin layer 34 in FIG. 10 is a layer that bonds the paper substrate layer 13 and the vapor deposition film 32 together. As the adhesive resin layer 34, the adhesive resin layer described in the first embodiment can be used. When the adhesive resin layer 34 contains a polyethylene-based resin, one using biomass-derived ethylene as a monomer unit may be used.

(Manufacturing method of packaging material)
Next, an example of a method for manufacturing a laminate that constitutes the packaging material 30 will be described.

An example of a method for manufacturing the packaging material 30 shown in FIG. 9 will be described. First, the paper substrate layer 13 on which the above-described printed layer 12 and surface protective layer 11 are formed, and the vapor deposition film 32 are prepared. Subsequently, the paper substrate layer 13 and the deposited film 32 are laminated via the adhesive layer 33 by dry lamination.

In the dry lamination method, first, an adhesive composition is applied to one of the two films to be laminated. Subsequently, the applied adhesive composition is dried to volatilize the solvent. The two films are then laminated via the dried adhesive composition. Subsequently, the two laminated films are aged in an environment of, for example, 20° C. or higher for 24 hours or longer in a wound state.

The print layer 12 and the surface protective layer 11 may be formed on the paper base layer 13 after laminating the paper base layer 13 and the deposited film 32 with the adhesive layer 33 interposed therebetween.

Next, an example of the manufacturing method of the packaging material 30 shown in FIG. 10 will be described. First, the paper substrate layer 13 on which the above-described printed layer 12 and surface protective layer 11 are formed, and the vapor deposition film 32 are prepared. Subsequently, the paper substrate layer 13 and the deposited film 32 are laminated via the adhesive resin layer 34 by a sand lamination method.

In the sand lamination method, first, a molten resin that forms the adhesive resin layer 34 is extruded onto one of the two films to be laminated. Subsequently, the other film is laminated on the resin extruded onto one film.

The printed layer 12 and the surface protection layer 11 may be formed on the paper base layer 13 after the paper base layer 13 and the vapor deposition film 32 are laminated via the adhesive resin layer 34 .

<Packaging products>
An example of a packaged product formed by using packaging material 30 will now be described. FIG. 11 is an example of a packaged product 30A formed by using the packaging material 30 shown in any of FIGS. 7-10. The packaged product 30A is a general paper container such as an outer box for sweets, a paper box for bottles, or an outer box for medicines.

By configuring the packaged product 30A using the packaging material 30 having the surface protective layer 11 containing the biomass-derived component, it is possible to reduce the amount of fossil fuel used compared to the conventional method. This can reduce the environmental load.

Third Embodiment Next, a third embodiment of the present invention will be described. In the third embodiment, the same reference numerals are assigned to the same parts as in the first embodiment, and detailed description thereof will be omitted. Further, when it is clear that the effects obtained in the first embodiment can also be obtained in the present embodiment, the explanation thereof may be omitted.

FIG. 12 is a cross-sectional view showing an example of packaging material 40 according to the third embodiment of the invention. The packaging material 40 includes a surface protective layer 11, a printed layer 12, a paper base layer 13, and an inner resin layer 41 in this order. The surface protective layer 11 constitutes the outer surface 40 y of the packaging material 40 , and the inner resin layer 41 constitutes the inner surface 40 x of the packaging material 40 .

FIG. 13 is a cross-sectional view showing another example of the packaging material 40 according to the third embodiment of the invention. The packaging material 40 includes a surface protective layer 11, a printed layer 12, a paper base layer 13, an adhesive layer 42, and an inner resin layer 41 in this order. The surface protective layer 11 constitutes the outer surface 40 y of the packaging material 40 , and the inner resin layer 41 constitutes the inner surface 40 x of the packaging material 40 .

Each layer constituting the packaging material 40 will be described below.

(Surface protective layer, printed layer, paper base layer)
As the surface protective layer 11, the printed layer 12, and the paper base layer 13, the surface protective layer 11, the printed layer 12, and the paper base layer 13 described in the first embodiment can be used.

(inner resin layer)
Examples of the resin contained in the inner resin layer 41 include polyethylene, polyolefins such as polypropylene and polymethylpentene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyvinyl chloride, and polystyrene. The inner resin layer 41 may be a layer formed on the paper base layer 13 by extrusion, or may be a film bonded to the paper base layer 13 via the adhesive layer 42 . When the inner resin layer 41 is formed by extrusion, the thickness of the inner resin layer 41 is, for example, 20 μm or more and 60 μm or less. When the inner resin layer 41 is a film bonded to the paper base layer 13, the thickness of the inner resin layer 41 is, for example, 7 μm or more and 50 μm or less.

The inner resin layer 41 may contain a biomass-derived component or may not contain a biomass-derived component. When the inner resin layer 41 contains a biomass-derived component, the inner resin layer 41 can be formed using, for example, the biomass polyester or biomass polyethylene described in the base material of the deposited film 32 of the second embodiment.

(adhesive layer)
The adhesive layer 42 is a layer that bonds the paper substrate layer 13 and the inner resin layer 41 when the inner resin layer 41 is in the form of a film. The adhesive layer 42 may contain a cured product of a polyol and an isocyanate compound, like the adhesive layer 33 of the second embodiment.

The adhesive layer 42 may contain a biomass-derived component. In the adhesive layer 42 containing a biomass-derived component, at least either polyol or isocyanate compound contains a biomass-derived component. As the polyol containing the biomass-derived component and the isocyanate compound containing the biomass-derived component, the polyol and isocyanate compound described in the printing layer 12 can be used.

(Manufacturing method of packaging material)
Next, an example of a method for manufacturing a laminate constituting the packaging material 40 will be described.

An example of a method for manufacturing the packaging material 40 shown in FIG. 12 will be described. First, the paper substrate layer 13 having the above-described printed layer 12 and surface protective layer 11 formed thereon is prepared. Subsequently, a molten resin is extruded onto the paper substrate layer 13 by a melt extrusion lamination method to form the inner resin layer 41 .

The print layer 12 and the surface protective layer 11 may be formed on the paper base layer 13 after the inner resin layer 41 is formed on the paper base layer 13 .

An example of a method for manufacturing the packaging material 40 shown in FIG. 13 will be described. First, a film constituting the paper base layer 13 on which the print layer 12 and the surface protection layer 11 are formed and the inner resin layer 41 is prepared. Subsequently, the paper substrate layer 13 and the film of the inner resin layer 41 are laminated via the adhesive layer 42 by dry lamination.

The print layer 12 and the surface protective layer 11 may be formed on the paper base layer 13 after laminating the paper base layer 13 and the film of the inner resin layer 41 via the adhesive layer 42 .

<Packaging products>
An example of a packaged product formed by using packaging material 40 will now be described. FIG. 14 is an example of a packaged product 40A formed by using the packaging material 40 shown in FIG. 12 or 13. FIG. The packaged product 40A is, for example, a tray that houses contents such as primary packaged food. When the primary packaged food is heated in the microwave oven, it may be removed from the primary packaging container and placed in a tray of packaged product 40A. In this case, the contents are in contact with the inner surface 40x of the packaging material 40 that constitutes the packaged product 40A.

FIG. 15 is a plan view showing a blank for making the packaged product 40A shown in FIG. In the blank, a front side plate 2, a rear side plate 3, a left side plate 4, and a right side plate 5 are connected to the front, back, left, and right of a rectangular bottom plate 1 through folding lines a to d, respectively. Triangular folding pieces 2a to 5a are connected to each other through folding lines e on both sides of the bottom plate, and adjacent folding pieces are connected through radial folding lines f extending outward from the corners of the bottom plate. to form a web corner portion W.

A lid plate 6 is connected to the upper side of the rear side plate 3 via a folding line g, and a flap 7 is connected to the upper side of the front side plate 2 via a folding line h. A locking piece 6a is protruded through the folding line i at the center of the tip, and a notch α for inserting the locking piece 6a is provided at the center of the folding line h connecting the flaps 7. . Moreover, the folding line i of the engaging piece 6a has a notch β for facilitating folding, and the cover plate 6 has notches 6b formed on both left and right sides thereof.

Handle plates 8 and 9 are connected to the upper sides of the left side plate 4 and the right side plate 5 through a folding line j, and the handle plates 8 and 9 are formed with a folding line k for folding in two. Further, at the ends of the handle plates 8 and 9, engaging insert pieces 8a and 9a protrude through the folding line l. In this example, V-shaped notches are formed at the roots of the insertion pieces 8a and 9a, and these insertion pieces 8a and 9a are engaged with the notches 6b on both left and right sides of the cover plate 6 during use. It is designed to

In addition, in this blank, three vertical corrugations are formed between the front side plate 2 and the rear side plate 3 to prevent bending. In addition, each of the folding lines a to l can be basically formed by pressing creases. Regarding the folding line k for folding 8 and 9 in two and the folding line l of the insertion pieces 8a and 9a, considering the ease of folding of the folding line portion when designing the blank, 1) during the crease So-called lead creases with notches, 2) perforations with a large pitch, 3) perforations with a small pitch, etc. may be employed as appropriate.

In order to assemble the blank of FIG. 15, first, the side plates 2 to 5 are erected with respect to the bottom plate 1, and at the same time, the folding pieces 2a to 5a are drawn out and folded to form the web corner portions W. A box shape as shown in FIG. 14 is formed by pasting the left side plate 4 and the right side plate 5 together with the web corner portion W folded in. As shown in FIG. When the blank is assembled in this manner, the upper opening is slightly curved outward due to the repulsive force against the bending of the paperboard.

By constructing the packaged product 40A using the packaging material 40 having the surface protective layer 11 containing the biomass-derived component, it is possible to reduce the amount of fossil fuel used compared to conventional packaging. This can reduce the environmental load.

EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the description of the Examples below as long as it does not exceed the gist thereof.

[Example 1A]
An ivory paper having a basis weight of 260 g/m ² was prepared as the paper base layer 13 . Subsequently, the printed layer 12 was formed on the paper base layer 13 . In the step of forming the printed layer 12, first, an ink composition containing a colorant, a binder resin, and a solvent was prepared. Urethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polyester polyol, a fossil fuel-derived isocyanate compound, and a fossil fuel-derived hydroxy (meth)acrylate, was used as the binder resin. As the fossil fuel-derived polyester polyol, a polyester polyol that is a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional carboxylic acid was used. Subsequently, the ink composition is applied on the paper base layer 13 in a predetermined pattern by offset printing, the ink composition on the paper base layer 13 is irradiated with ultraviolet rays, and a printed layer is formed on the paper base layer 13. 12 was formed. The thickness of the printed layer 12 was 1 μm.

Subsequently, a surface protective layer 11 was formed on the printed layer 12 . In the step of forming the surface protective layer 11, first, a paint containing a binder resin and a solvent was prepared. As the binder resin, biourethane (meth)acrylate, which is a reaction product of a polyester polyol containing a biomass-derived component, a fossil fuel-derived isocyanate compound, and a fossil fuel-derived hydroxy (meth)acrylate, was used. Subsequently, the paint was applied to the entire printed layer 12 by an offset method, and the paint on the printed layer 12 was irradiated with ultraviolet rays to form the surface protective layer 11 . The thickness of the surface protective layer 11 was 1 μm. Thus, the packaging material 20 having the layer structure shown in FIG. 1 was produced.

The layer structure of the packaging material 20 of this embodiment is expressed as follows.
Bio table/stamp/paper "/" represents the boundary between layers. The leftmost layer is the layer forming the outer surface of the packaging material, and the rightmost layer is the layer forming the inner surface of the packaging material.
"Biosurface" means a surface protective layer derived from biomass. "Mark" means printed layer. "Paper" means a paper base layer. "Adhesive resin" means an adhesive resin layer derived from fossil fuels. "AL foil" means aluminum foil. "PE(1)" means a polyethylene film derived from fossil fuels. The number means the layer thickness (unit: μm).

Subsequently, using the packaging material 20, the outer cylinder 52 of the heat insulating container 50 shown in FIG. 4 was produced. The heat insulating container 50 can contain, for example, instant noodles and soup.

[Example 1B]
In the same manner as in Example 1A, except that a reaction product of a polyfunctional alcohol derived from a fossil fuel and a polyfunctional carboxylic acid containing a biomass-derived component was used as the polyester polyol of the binder resin of the surface protective layer 11. A packaging material 20 was produced.

[Example 1C]
Biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polyester polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, was used as the binder resin of the surface protective layer 11. A packaging material 20 was produced in the same manner as in Example 1A except for the above.

FIG. 16A collectively shows the layer structure and the like of the packaging materials 20 of Examples 1A to 1C. In the column of "biomass-derived component in surface protective layer" in Fig. 16A, the description "binder resin" means that the binder resin used in the surface protective layer contains a biomass-derived component.
In the column of "biomass-derived component in binder resin of surface protective layer", the description "polyol" means that the polyol used in the binder resin of the surface protective layer contains a biomass-derived component. Moreover, the description "isocyanate compound" means that the isocyanate compound used in the binder resin of the surface protective layer contains a biomass-derived component.
In the column of "type of polyol for surface protective layer", the description "ester-based" means that the polyol used in the binder resin for the surface protective layer is polyester polyol.
In addition, in the column of "biomass-derived component in the polyol of the surface protective layer", the description "polyfunctional alcohol" means that at least the polyfunctional alcohol of the polyester polyol among the components used in the polyol of the binder resin of the surface protective layer is It means that it is derived from biomass. Similarly, the description "polyfunctional carboxylic acid" means that at least the polyfunctional carboxylic acid of the polyester polyol among the components used in the polyol of the binder resin of the surface protective layer is derived from biomass. The description of "-" means that the polyol of the binder resin of the surface protective layer does not contain a biomass-derived component.

In Examples 1A to 1C, in the binder resin of the surface protective layer, one of the three constituents of the polyfunctional alcohol or polyfunctional carboxylic acid used in the polyester polyol, or the isocyanate compound is a biomass-derived component. Although a certain example was shown, it is not restricted 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]
A packaging material 20 was produced in the same manner as in Example 1A, except that polyether polyol was used as the polyol for the binder resin of the surface protective layer 11 . 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.

[Example 1E]
In the same manner as in Example 1D, except that a reaction product of a polyfunctional alcohol derived from a fossil fuel and a polyfunctional isocyanate containing a biomass-derived component was used as the polyether polyol of the binder resin of the surface protective layer 11. A packaging material 20 was produced.

[Example 1F]
As the binder resin for the surface protective layer 11, biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polyether polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, is used. A packaging material 20 was made in the same manner as in Example 1D, except that

FIG. 16A collectively shows the layer structure of the packaging materials 20 of Examples 1D to 1F. In the column of "polyol type of surface protective layer" in FIG. 16A, the description "ether type" means that the polyol used in the binder resin of the surface protective layer is polyether polyol. In addition, in the column of "biomass-derived component in the polyol of the surface protective layer", the description "polyfunctional isocyanate" means that at least the polyfunctional isocyanate among the components used in the polyol of the binder resin of the surface protective layer is biomass-derived. It means that there is

In Examples 1D to 1F, in the binder resin of the surface protective layer, one of the three constituents of the polyfunctional alcohol, polyfunctional isocyanate, or isocyanate compound used in the polyether polyol was a biomass-derived component. Although a certain example was shown, it is not restricted to this. For example, two of the three components may contain biomass-derived components, or all three components may contain biomass-derived components.

[Example 1G]
A packaging material 20 was produced in the same manner as in Example 1A, except that a polycarbonate polyol was used as the polyol for the binder resin of the surface protective layer 11 . Specifically, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a fossil fuel-derived carbonate was used as the polycarbonate polyol.

[Example 1H]
As the binder resin for the surface protective layer 11, biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polycarbonate polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, was used. A packaging material 20 was produced in the same manner as in Example 1G, except for the above.

FIG. 16A collectively shows the layer structures of the packaging materials 20 of Examples 1G and 1H. In the column of "polyol type of surface protective layer" in FIG. 16A, the description "carbonate-based" means that the polyol used in the binder resin of the surface protective layer is polycarbonate polyol.

In Examples 1G and 1H, in the binder resin of the surface protective layer, one of the two constituent elements of the polyfunctional alcohol used in the polycarbonate polyol or the isocyanate compound is a biomass-derived component. However, it is not limited to this. For example, either of the two components may contain biomass-derived components.

[Example 1I]
A packaging material 20 was produced in the same manner as in Example 1A, except that the printing layer 12 containing a biomass-derived component was used. Specifically, as the binder resin of the printed layer 12, biourethane (meth) which is a reaction product of a polyester polyol containing a biomass-derived component, a fossil fuel-derived isocyanate compound, and a fossil fuel-derived hydroxy (meth)acrylate Acrylate was used. As the polyester polyol containing a biomass-derived component, 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.

The layer structure of the packaging material 20 of this embodiment is expressed as follows.
Bio-face/Bio-mark/Paper "Bio-mark" means a printing layer derived from biomass.

[Example 1J]
Packaging in the same manner as in Example 1I, except that a reaction product of a polyfunctional carboxylic acid containing a polyfunctional alcohol derived from a fossil fuel and a biomass-derived component was used as the polyester polyol of the binder resin of the printing layer 12. Material 20 was made.

[Example 1K]
Biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polyester polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, is used as the binder resin of the printing layer 12. A packaging material 20 was produced in the same manner as in Example 1I, except for the above.

FIG. 16B collectively shows the layer structure of the packaging materials 20 of Examples 1I to 1K. In the column of "biomass-derived component in printed layer" in Fig. 16B, the description "binder resin" means that the binder resin used in the printed layer contains a biomass-derived component.
In the column of "biomass-derived component in the binder resin of the printing layer", the description "polyol" means that the polyol used in the binder resin of the printing layer contains the biomass-derived component. Moreover, the description "isocyanate compound" means that the isocyanate compound used in the binder resin of the printing layer contains a biomass-derived component.
In the column of "type of polyol for printing layer", the description "ester-based" means that the polyol used in the binder resin for the printing layer is polyester polyol.
In addition, in the column of "biomass-derived component in the polyol of the printing layer", the description "polyfunctional alcohol" means that at least the polyfunctional alcohol of the polyester polyol among the components used in the polyol of the binder resin of the printing layer is biomass-derived means that Similarly, the description "polyfunctional carboxylic acid" means that at least the polyfunctional carboxylic acid of the polyester polyol among the components used in the polyol of the binder resin of the printing layer is derived from biomass. Moreover, the description of "-" means that the polyol of the binder resin of the printing layer does not contain a biomass-derived component.

In Examples 1I to 1K, in the binder resin of the printing layer, one of the three constituents of the polyfunctional alcohol or polyfunctional carboxylic acid used in the polyester polyol, or the isocyanate compound is a biomass-derived component. Although an example is shown, it 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 1L]
A packaging material 20 was produced in the same manner as in Example 1I, except that polyether polyol was used as the polyol for the binder resin of the printed layer 12 . 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.

[Example 1M]
Packaging in the same manner as in Example 1L, except that a reaction product of a polyfunctional alcohol derived from fossil fuel and a polyfunctional isocyanate containing a biomass-derived component was used as the polyether polyol of the binder resin of the printing layer 12. Material 20 was made.

[Example 1N]
Biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polyether polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, was used as the binder resin for the printed layer 12. A packaging material 20 was produced in the same manner as in Example 1L, except for the above.

FIG. 16B collectively shows the layer structure of the packaging materials 20 of Examples 1L to 1N. In the column of "type of polyol for printing layer" in FIG. 16B, the description "ether-based" means that the polyol used in the binder resin of the printing layer is polyether polyol. In addition, in the column of "biomass-derived component in the polyol of the printing layer", the description "polyfunctional isocyanate" means that at least the polyfunctional isocyanate among the components used in the polyol of the binder resin of the printing layer is derived from biomass. means

In Examples 1L to 1N, in the binder resin of the printing layer, one of the three constituents of polyfunctional alcohol, polyfunctional isocyanate, or isocyanate compound used in polyether polyol is a biomass-derived component. Although an example is shown, it 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 1O]
A packaging material 20 was produced in the same manner as in Example 1I, except that a polycarbonate polyol was used as the polyol for the binder resin of the printed layer 12 . Specifically, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a fossil fuel-derived carbonate was used as the polycarbonate polyol.

[Example 1P]
Biourethane (meth)acrylate, which is a reaction product of a fossil fuel-derived polycarbonate polyol, an isocyanate compound containing a biomass-derived component, and a fossil fuel-derived hydroxy (meth)acrylate, is used as the binder resin of the printing layer 12. A packaging material 20 was produced in the same manner as in Example 1O, except for the above.

FIG. 16B collectively shows the layer structures of the packaging materials 20 of Examples 1O and 1P. In the column of "polyol type of printing layer" in FIG. 16B, the description "carbonate-based" means that the polyol used in the binder resin of the printing layer is polycarbonate polyol.

In Examples 1O and 1P, in the binder resin of the printing layer, one of the two constituent elements of the polyfunctional alcohol used in the polycarbonate polyol or the isocyanate compound was a biomass-derived component. , but not limited to these. For example, either of the two components may contain biomass-derived components.

[Example 2A]
A coated cardboard having a basis weight of 270 g/m ² was prepared as the paper base layer 13 . Subsequently, a printed layer 12 containing urethane (meth)acrylate similar to that of Example 1A was formed on the paper base layer 13 by UV offset printing similar to that of Example 1A. Subsequently, a surface protective layer 11 containing urethane (meth)acrylate containing a biomass-derived component as in Example 1A was formed on the printed layer 12 by UV offset printing in the same manner as in Example 1A. Subsequently, a surface layer 14 was partially formed on the surface protective layer 11 . Thus, the packaging material 30 having the layer structure shown in FIG. 7 was produced.

The layer structure of the packaging material 30 of this embodiment is expressed as follows.
Surface treatment/bio-surface/mark/paper "Surface treatment" means a surface layer partially formed on the surface protective layer.

Subsequently, using the packaging material 30, a packaged product 30A shown in FIG. 11 was produced. The packaged product 30A can be used, for example, as an outer box for sweets, an outer box for pharmaceuticals, or the like.

[Example 2B]
A packaging material 30 was produced in the same manner as in Example 2A, except that the surface layer 14 was not included.

The layer structure of the packaging material 30 of this embodiment is expressed as follows.
Bio table/stamp/paper

It should be noted that variations similar to those of Examples 1B to 1P can also be employed in Examples 2A and 2B described above. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 3]
A coated cardboard having a basis weight of 230 g/m ² was prepared as the paper base layer 13 . Subsequently, a printed layer 12 containing urethane (meth)acrylate similar to that of Example 1A was formed on the paper base layer 13 by UV offset printing similar to that of Example 1A. Subsequently, a surface protective layer 11 containing urethane (meth)acrylate containing a biomass-derived component as in Example 1A was formed on the printed layer 12 by UV offset printing in the same manner as in Example 1A. Subsequently, the cardboard layer 31 was attached to the paper base layer 13 . As the corrugated board layer 31, a G-tiered cardboard layer having G flutes with a corrugated height of about 0.5 mm was used. Thus, the packaging material 30 having the layer structure shown in FIG. 8 was produced.

The layer structure of the packaging material 30 of this embodiment is expressed as follows.
Bio table/stamp/paper/corrugation “Corrugation” means corrugated board layer.

Subsequently, using the packaging material 30, a packaged product 30A shown in FIG. 11 was produced. The packaged product 30A can be used, for example, as an outer box for electronic equipment.

It should be noted that variations similar to those of Examples 1B to 1P can also be employed in Examples 2A and 2B described above. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 4]
An ivory paper having a basis weight of 270 g/m ² was prepared as the paper base layer 13 . Subsequently, a printed layer 12 containing urethane (meth)acrylate similar to that of Example 1A was formed on the paper base layer 13 by UV offset printing similar to that of Example 1A. Subsequently, a surface protective layer 11 containing urethane (meth)acrylate containing a biomass-derived component as in Example 1A was formed on the printed layer 12 by UV offset printing in the same manner as in Example 1A. Subsequently, the inner resin layer 41 was formed by extruding molten polyethylene terephthalate onto the paper substrate layer 13 by a melt extrusion lamination method. Thus, the packaging material 40 having the layer structure shown in FIG. 12 was produced.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table/stamp/paper/PET(2)30
"PET(2)" means a layer of fossil fuel-derived polyethylene terephthalate formed by melt extrusion lamination.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

Note that variations similar to those of Examples 1B to 1P can also be employed in this example. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 5]
A packaging material 40 was prepared in the same manner as in Example 4, except that the inner resin layer 41 was formed by extruding molten polypropylene onto the paper base layer 13 by a melt extrusion lamination method. made.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table/stamp/paper/PP(2)30
"PP(2)" means a layer of fossil fuel-derived polypropylene formed by melt extrusion lamination.

Note that variations similar to those of Examples 1B to 1P can also be employed in this example. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 6A]
The packaging material 40 was prepared in the same manner as in Example 4, except that the inner resin layer 41 was formed by extruding polyethylene in a molten state onto the paper base layer 13 by a melt extrusion lamination method. made.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table / stamp / paper / contact / PE (2) 30
"PE(2)" means a layer of fossil fuel-derived polyethylene formed by melt extrusion lamination.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

[Example 6B]
A packaging material 40 was produced in the same manner as in Example 6A, except that polyethylene containing a biomass-derived component was used as the inner resin layer 41 .

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table / stamp / paper / bio PE (2) 30
"Bio-PE (2)" means a layer of polyethylene containing biomass-derived components formed by melt extrusion lamination.

Note that variations similar to those of Examples 1B to 1P can also be employed in Examples 6A and 6B described above. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 7A]
An ivory paper having a basis weight of 270 g/m ² was prepared as the paper base layer 13 . Subsequently, a printed layer 12 containing urethane (meth)acrylate similar to that of Example 1A was formed on the paper base layer 13 by UV offset printing similar to that of Example 1A. Subsequently, a surface protective layer 11 containing urethane (meth)acrylate containing a biomass-derived component as in Example 1A was formed on the printed layer 12 by UV offset printing in the same manner as in Example 1A. Subsequently, the film forming the inner resin layer 41 and the paper base layer 13 were bonded together with the adhesive layer 42 interposed therebetween by a dry lamination method. As the film of the inner resin layer 41, a PET film (thickness: 12 μm) containing polyethylene terephthalate derived from fossil fuel was used. In the dry lamination method, a polyester polyol, which is a reaction product of a fossil fuel-derived polyfunctional alcohol and a fossil fuel-derived polyfunctional carboxylic acid, was prepared as a main agent. In addition, an isocyanate compound derived from fossil fuel was prepared as a curing agent. Thus, the packaging material 40 having the layer structure shown in FIG. 13 was produced.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table / stamp / paper / contact / PET (1) 12
By "contact" is meant a fossil fuel derived adhesive layer. "PET(1)" means a PET film comprising polyethylene terephthalate derived from fossil fuels.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

[Example 7B]
The packaging material 40 was prepared in the same manner as in Example 7A, except that polyethylene terephthalate containing biomass-derived polyethylene terephthalate was used as the polyethylene terephthalate of the inner resin layer 41, and that containing a biomass-derived component was used as the adhesive layer 42. was made. Specifically, a PET film (thickness: 12 μm) containing biomass-derived components was used as the inner resin layer 41 . Moreover, as the main agent of the adhesive layer 42, 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.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table/stamp/paper/bio contact/bio PET(1)12
"Bioadhesive" means an adhesive layer that includes a biomass-derived component. "Bio-PET (1)" means a PET film containing a biomass-derived component.

It should be noted that variations similar to those of Examples 1B to 1P can also be employed in Examples 7A and 7B described above. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 8]
A packaging material 40 was produced in the same manner as in Example 7A, except that a polypropylene film (20 μm thick) containing polypropylene derived from fossil fuel was used as the inner resin layer 41 .

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table / stamp / paper / contact / PP (1) 20
"PP(1)" means a polypropylene film containing polypropylene derived from fossil fuels.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

Note that variations similar to those of Examples 1B to 1P can also be employed in this example. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 9]
A packaging material was prepared in the same manner as in Example 6A, except that the inner resin layer 41 was formed by extruding molten polymethylpentene onto the paper base layer 13 by a melt extrusion lamination method. 40 was made.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table/stamp/paper/PMP(2)30
"PMP(2)" means a layer of fossil fuel-derived polymethylpentene formed by a melt extrusion lamination process.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

Note that variations similar to those of Examples 1B to 1P can also be employed in this example. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

[Example 10]
A packaging material was prepared in the same manner as in Example 6A, except that the inner resin layer 41 was formed by extruding polybutylene terephthalate in a molten state onto the paper base layer 13 by a melt extrusion lamination method. 40 was made.

The layer structure of the packaging material 40 of this embodiment is expressed as follows.
Bio table/stamp/paper/PBT(2)30
"PBT(2)" means a layer of fossil fuel-derived polybutylene terephthalate formed by a melt extrusion lamination process.

Subsequently, using the packaging material 40, a paper tray 40A shown in FIG. 14 was produced. The paper tray 40A can contain, for example, primary packaged food.

Note that variations similar to those of Examples 1B to 1P can also be employed in this example. For example, as the surface protective layer containing a biomass-derived component, the surface protective layers shown in Examples 1B to 1H may be used in addition to the surface protective layer shown in Example 1A. Further, as the printed layer, a printed layer containing a biomass-derived component as shown in Examples 1I to 1P may be used.

FIG. 17 summarizes examples of layer configurations and types of packaging containers of the packaging materials 10 of Examples 1A, 2A-10.

11 Surface protective layer 12 Printed layer 13 Paper substrate layer 14 Surface layer 20 Packaging material 20A Packaging product 21 Anchor coat layer 22 Sealant layer 23 Metal foil 24 Adhesive resin layer 25 Adhesive resin layer 30 Packaging material 30A Packaging product 31 Cardboard layer 32 Vapor deposition Film 33 Adhesive layer 34 Adhesive resin layer 40 Packaging material 40A Packaged product 41 Inner resin layer 42 Adhesive layer 50 Heat insulating container 51 Paper cup body 52 Outer cylinder 55 Paper cup

Claims (4)

A packaging material in which at least a surface protective layer, a printed layer, and a paper base layer are laminated in order,
The surface protective layer contains a urethane (meth)acrylate that is a reaction product of a polyol, an isocyanate compound, and a hydroxy (meth)acrylate,
At least one of the polyol or the isocyanate compound contains a biomass-derived component,
The packaging material, wherein the printed layer contains a coloring agent, and a urethane (meth)acrylate that is a reaction product of a polyol, an isocyanate compound, and a hydroxy (meth)acrylate. The packaging material according to claim 1, wherein the polyol of the surface protective layer comprises a biomass-derived component. The packaging material according to claim 1 or 2, wherein the isocyanate compound of the surface protective layer contains a biomass-derived component. A packaged product comprising a packaging material according to any one of claims 1-3.

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