JP2020055160A - Packaging material and packaging product - Google Patents

Abstract

To provide a packaging material with an improved degree of biomass.SOLUTION: A packaging material at least has a surface resin layer, a printed layer, and a paper substrate layer, which are laminated in this order. The surface resin layer has polyethylene, polyethylene terephthalate or polypropylene. The printed layer has a colorant, and a urethane (meth) acrylate that is a reactant of a polyol, an isocyanate compound and a hydroxy (meth) acrylate. At least one of the polyol, isocyanate compound or hydroxy (meth) acrylate has a biomass-derived component.SELECTED DRAWING: Figure 1

Description

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

  2. Description of the Related Art Conventionally, various packaging materials have been developed and proposed as packaging materials for configuring packaging products for filling and packaging various articles such as food and drink, pharmaceuticals, chemicals, cosmetics, sanitary products, daily necessities, and the like. The packaging material is composed of a laminate including at least a base layer and a printed layer for forming a printed pattern.

  In recent years, with the growing demand for the establishment of a recycling-based society, in the field of laminates that constitute packaging materials, as in the field of energy, it has been desired to break away from fossil fuels, and the use of biomass has attracted attention. I have. Biomass is an organic compound that is photosynthesized from carbon dioxide and water, and is a so-called carbon-neutral renewable energy that is converted into carbon dioxide and water again by using it. Recently, biomass plastics using biomass as a raw material have been rapidly commercialized, and attempts have been made to produce various resins from biomass raw materials.

  As a biomass-derived resin, commercial production of polylactic acid (PLA), which is manufactured via lactic acid fermentation, has begun, but its performance as a plastic, including its biodegradability, is the current general-purpose plastic. Therefore, there is a limit in the product use and the method of manufacturing the product, and the product has not been widely used. In addition, a life cycle assessment (LCA) evaluation is performed on the PLA, and the energy consumption at the time of manufacturing the PLA and the equivalence at the time of replacing the general-purpose plastic are discussed.

  Here, as the general-purpose plastic, various types such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester are used. In particular, polyethylene is formed into films, sheets, bottles, and the like, and is used for various uses such as packaging materials, and is widely used worldwide. Therefore, using polyethylene derived from the conventional fossil fuel has a large environmental load. Therefore, it is desired to reduce the amount of fossil fuel used by using biomass-derived raw materials in the production of polyethylene. For example, to date, it has been studied to produce ethylene and butylene as raw materials for polyolefin resins from renewable natural raw materials (see Patent Document 1). In the field of soft packaging such as pouches, it has been proposed to apply such biomass-derived raw materials to packaging materials (see Patent Document 2).

JP 2011-506628 A JP 2018-51788 A

  Also in the field of packaging materials for paper containers including a paper base layer, it is desired to reduce the amount of fossil fuel used by using biomass-derived raw materials.

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

  The present invention is a packaging material in which at least a surface resin layer, a printing layer, and a paper base layer are sequentially laminated, wherein the surface resin layer contains polyethylene, polyethylene terephthalate, or polypropylene, and the printing layer is colored. And a urethane (meth) acrylate which is a reaction product of a polyol, an isocyanate compound and hydroxy (meth) acrylate, wherein at least one of the polyol, the isocyanate compound or the hydroxy (meth) acrylate is a biomass-derived component And packaging materials.

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

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

  In the packaging material according to the present invention, the surface resin layer may include polyethylene or polyethylene terephthalate containing a biomass-derived component.

  The present invention is a packaged product provided with the packaging material described above.

  ADVANTAGE OF THE INVENTION According to this invention, the biomass degree of the packaging material containing a paper base material layer can be raised.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the packaging material by one Embodiment of this invention. It is a figure showing an example of a packaging container provided with packaging material by one embodiment of the present invention. It is a figure which shows the layer constitution of the packaging material of Examples 1A-1I. It is a figure which shows the layer structure of the packaging material of Example 1A, 1I, and 2A-3.

  The laminate constituting the packaging material according to the present invention includes at least a surface resin layer, a print layer, and a paper base layer that are sequentially laminated from the outer surface side to the inner surface side. The inner surface is a surface located on the side of the content accommodated in the packaging product in the packaging product formed from the packaging material. 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 “provide in this order” and “laminated 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. When the biomass degree is in the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

  FIG. 1 is a sectional view showing an example of a packaging material 20 according to the first embodiment of the present invention. The packaging material 20 includes the surface resin layer 11, the adhesive layer 27, the print layer 12, and the paper base layer 14 in this order. The surface resin layer 11 forms the outer surface 20y of the packaging material 20, and the paper base layer 14 forms the inner surface 20x of the packaging material 20.

  Hereinafter, each layer constituting the packaging material 20 will be described.

(Paper base layer)
The paper base material layer 14 is a layer containing paper. The paper base layer 14 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. The paper substrate layer 14 is intended for white paperboard in general, but ivory paper, milk carton base paper, cup base paper, card paper, etc. using natural pulp are particularly preferable from the viewpoint of safety.

  The paperboard may use neutral rosin, alkyl ketene dimer, or alkenyl succinic anhydride as a sizing agent, or cationic polyacrylamide or cationic starch as a fixing agent. It is also possible to use a sulfuric acid band to make paper in a neutral region of pH 6 or more and pH 9 or less. In addition, if necessary, in addition to the above-mentioned sizing agent, other than the fixing agent, various fillers for papermaking, a retention enhancer, a dry paper strength enhancer, a wet paper strength enhancer, a binder, a dispersant, a flocculant, a plasticizer. Agents and adhesives may be appropriately contained.

(Print layer)
The printing layer 12 is a layer formed by printing to display decoration, display of contents, display of a best-before period, display of a manufacturer, a seller, and the like, and display and beauty. The printing layer 12 includes, for example, a picture layer that forms a desired arbitrary picture such as a picture, a photograph, a character, a number, a figure, a symbol, and a pattern. The printing layer may further include a ground color layer formed by printing so as to make the picture of the picture layer stand out.

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

(Coloring agent)
The colorant is not particularly limited, and conventionally known pigments and dyes can be used.

(Binder resin)
The binder resin contains a biomass-derived component. For example, the binder resin contains urethane (meth) acrylate, which is a reaction product of a polyol, an isocyanate compound, and hydroxy (meth) acrylate, and the polyol or isocyanate compound contains a biomass-derived component. In the following description, urethane (meth) acrylate containing a biomass-derived component is also referred to as biourethane (meth) acrylate.

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

  As the polyol, a polyester polyol which is a reactant of a polyfunctional alcohol and a polyfunctional carboxylic acid, a polyether polyol which is a reactant of a polyfunctional alcohol and a polyfunctional isocyanate, or a reactant of a polyfunctional alcohol and a carbonate Certain polycarbonate polyols can be used. Hereinafter, each polyol will be described.

<Polyester polyol>
When the polyester polyol contains a biomass-derived component, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid contains a biomass-derived component. The following examples can be given as polyester polyols containing biomass-derived components.
・ Reacted product of polyfunctional alcohol derived from biomass and polyfunctional carboxylic acid derived from biomass ・ Reacted product of polyfunctional alcohol derived from fossil fuel and polyfunctional carboxylic acid derived from biomass ・ Polyfunctional alcohol derived from biomass and derived from fossil fuel With polyfunctional carboxylic acid

  As the polyfunctional alcohol derived from biomass, an aliphatic polyfunctional alcohol obtained from a plant material such as corn, sugar cane, cassava, and sago palm can be used. Examples of the aliphatic polyfunctional alcohols derived from biomass include, for example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), and butylene obtained from plant raw materials by the following method. 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-hydroxypropyl aldehyde (HPA) by a fermentation method in which glucose is obtained by decomposing plant materials. Compared with polypropylene glycol produced by the EO production method, polypropylene glycol produced by a bio-method such as the above fermentation method can provide useful by-products such as lactic acid from the viewpoint of safety, and can also keep production costs low. It is also preferred that it is possible.
Butylene glycol derived from biomass can be produced by producing succinic acid by producing and fermenting glycol from plant raw materials and hydrogenating it.
Biomass-derived ethylene glycol can be produced, for example, from bioethanol obtained by a conventional method via ethylene.

  As the polyfunctional alcohol derived from fossil fuel, a compound having two or more, preferably 2 to 8 hydroxyl groups in one molecule can be used. Specifically, as the polyfunctional alcohol derived from fossil fuel, there is no particular limitation, and conventionally known ones can be used. For example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG) , Diethylene glycol (DEG), butylene glycol (BG), hexamethylene glycol, triethylene glycol, dipropylene glycol, 1,4-cyclohexanedimethanol, trimethylolpropane, glycerin, 1,9-nonanediol, 3-methyl -1,5-pentanediol, polyether polyol, polycarbonate polyol, polyolefin polyol, acrylic polyol and the like can be used. These may be used alone or in combination of two or more.

  Biomass-derived polyfunctional carboxylic acids include recyclable plant-derived oils such as soybean oil, linseed oil, tung oil, coconut oil, palm oil, castor oil, and waste edible oil mainly composed of them. An aliphatic polyfunctional carboxylic acid obtained from a plant material such as oil can be used. Examples of the aliphatic polyfunctional carboxylic acid derived from biomass include sebacic acid, succinic acid, phthalic acid, adipic acid, glutaric acid, dimer acid and the like. For example, sebacic acid is produced as a by-product of heptyl alcohol by subjecting ricinoleic acid obtained from castor oil to alkaline pyrolysis. In the present invention, it is particularly preferable to use succinic acid derived from biomass or sebacic acid derived from biomass. These may be used alone or in combination of two or more.

  As the polyfunctional carboxylic acid derived from the fossil fuel, an aliphatic polyfunctional carboxylic acid or an aromatic polyfunctional carboxylic acid can be used. As the aliphatic polyfunctional carboxylic acid derived from fossil fuel, there is no particular limitation, and conventionally known ones can be used. Examples thereof include adipic acid, dodecane diacid, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, and maleic anhydride. Acids, itaconic anhydride, sebacic acid, succinic acid, glutaric acid, and dimer acid, and ester compounds thereof. The aromatic polyfunctional carboxylic acid derived from fossil fuel is not particularly limited, and conventionally known ones can be used.For example, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, phthalic anhydride, trimellitic acid, And pyromellitic acid, and ester compounds thereof. These may be used alone or in combination of two or more.

<Polyether polyol>
When the polyether polyol contains a biomass-derived component, at least one of the polyfunctional alcohol and the polyfunctional isocyanate contains a biomass-derived component. The following examples can be given as polyether polyols containing components derived from biomass.
・ Reacted product of polyfunctional alcohol derived from biomass and polyfunctional isocyanate derived from biomass ・ Reacted product of polyfunctional alcohol derived from fossil fuel and polyfunctional isocyanate derived from biomass ・ Multifunctional alcohol derived from biomass and polyfunctional isocyanate Reactant with functional isocyanate

  As the polyfunctional alcohol derived from biomass and the polyfunctional alcohol derived from fossil fuel, the polyfunctional alcohol derived from biomass and the polyfunctional alcohol derived from fossil fuel described in the above 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. The obtained one can be used. The biomass-derived polyfunctional isocyanate is, for example, a biomass-derived diisocyanate. Examples of the biomass-derived diisocyanate include dimer acid diisocyanate (DDI), octamethylene diisocyanate, and decamethylene diisocyanate. Alternatively, a plant-derived diisocyanate can 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 subjecting a carboxyl group of lysine to methyl esterification and then converting an amino group to an isocyanate group. In addition, 1,5-pentamethylene diisocyanate is obtained by decarboxylating a carboxyl group of lysine and then converting an amino group to an isocyanate group.

  Other methods for synthesizing 1,5-pentamethylene diisocyanate include a phosgenation method and a carbamate method. More specifically, the phosgenation method is a method in which 1,5-pentamethylenediamine or a salt thereof is directly reacted with phosgene or a method in which pentamethylenediamine hydrochloride is suspended in an inert solvent and reacted with phosgene. According to the method, 1,5-pentamethylene diisocyanate is synthesized. In the carbamate method, 1,5-pentamethylene diisocyanate or a salt thereof is first carbamate to produce pentamethylene dicarbamate (PDC), and then thermally decomposed to give 1,5-pentamethylene diisocyanate. It is to be synthesized. In the present invention, as a polyisocyanate suitably used, 1,5-pentamethylene diisocyanate-based polyisocyanate (trade name: Stabio (registered trademark)) manufactured by Mitsui Chemicals, Inc. may be mentioned.

  The polyfunctional isocyanate derived from fossil fuel is not particularly limited, and conventionally known ones can be used. For example, toluene-2,4-diisocyanate, 4-methoxy-1,3-phenylene diisocyanate, 4-isopropyl-isocyanate 1,3-phenylene diisocyanate, 4-chloro-1,3-phenylene diisocyanate, 4-butoxy-1,3-phenylene diisocyanate, 2,4-diisocyanate diphenyl ether, 4,4′-methylenebis (phenylene isocyanate) (MDI), Julilylene diisocyanate, tolidine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalene diisocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, 4,4'-diisocyanate diisocyanate Aromatic diisocyanate such as Njiru the like. 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-methylene bis (cyclohexyl isocyanate) ), 1,5-tetrahydronaphthalenediisocyanate, isophorone diisocyanate, alicyclic diisocyanates such as hydrogenated MDI and hydrogenated XDI. 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 carbonate derived from a fossil fuel can be used as the polycarbonate polyol. Examples of the carbonate include 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 polyfunctional alcohol derived from biomass, the polyfunctional alcohol derived from biomass described in the above polyester polyol can be used.

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

<Hydroxy (meth) acrylate>
Next, the hydroxy (meth) acrylate will be described. Examples of the hydroxy (meth) acrylate 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 such as glycerin di (meth) acrylate, pentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, sorbitol penta (meth) acrylate, etc. Hydroxy (meth) acrylate having two or more (meth) acryloyl groups is exemplified. These may be used alone or in combination of two or more.

The printing layer 12 has a biomass degree of preferably 5% or more, more preferably 5% or more and 50% or less, and still more preferably 10% or more and 50% or less. When the biomass degree is in 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, and still more preferably 1 g / m ² or more and 3 g / m ^{2. 2} or less. The printing layer 12 has a thickness of preferably 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. Note that a plurality of printing layers 12 having such weight and thickness may be provided.

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

When the value obtained by measuring the content of carbon derived from biomass by radioactive carbon (C14) measurement is indicated as "biomass degree", the "biomass degree" can be obtained as follows. That is, since carbon dioxide in the atmosphere contains C14 at a constant rate (105.5 pMC), plants that take in carbon dioxide in the atmosphere and grow, for example, corn, also have a C14 content of about 105.5 pMC. It is known that It is also known that C14 is hardly contained in fossil fuels. Therefore, by measuring the ratio of C14 contained in all the carbon atoms in the polyester, the ratio of carbon derived from biomass can be calculated. When the content of C14 in the print layer 12 is defined as _PC14 , the content P _bio of carbon derived from biomass can be determined as follows.
P _bio (%) = P _C14 /105.5×100

  Further, the “degree of biomass” may be a weight ratio of a biomass-derived component. Hereinafter, unless otherwise specified, the “degree of biomass” indicates a weight ratio of a biomass-derived component.

(Surface resin layer)
Surface resin layer 11 contains polyethylene, polyethylene terephthalate, or polypropylene. The surface resin layer 11 can be formed using a plastic film containing, for example, polyethylene, polyethylene terephthalate, or polypropylene. The surface resin layer 11 is located outside the packaging material 20. When the packaging material 20 includes the surface resin layer 11, water resistance, heat sealability, and other physical properties can be imparted.

  Examples of the polyethylene used for the surface resin layer 11 include polyethylene such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene, and polypropylene. As a material used for the surface resin layer 11, low-density polyethylene, linear low-density polyethylene, or medium-density polyethylene is preferable.

  The surface resin layer 11 may include a material derived from biomass, or may include a material derived from fossil fuel. When the surface resin layer includes a biomass-derived material, for example, the surface resin layer 11 may include polyethylene or polyethylene terephthalate containing a biomass-derived component. When the surface resin layer 11 contains a material derived from biomass, the surface resin layer 11 preferably has a biomass degree of 5% or more, more preferably 10% or more and 95% or less. When the biomass degree is in the above range, the amount of fossil fuel used can be reduced, and the environmental load can be reduced.

  Surface resin layer 11 preferably has a thickness of 9 μm or more and 80 μm or less, more preferably 12 μm or more and 40 μm or less.

(Adhesive layer)
The adhesive layer 27 is a layer provided when two arbitrary layers are bonded. The adhesive layer 27 in FIG. 1 is a layer that bonds the print layer 12 and the surface resin layer 11 together.

As the adhesive used for the adhesive layer 27, for example, an emulsion type laminating adhesive can be used. As the method for coating the adhesive, for example, a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a Fonten method, a transfer roll coating method, or another method can be used. The coating amount is preferably from 0.1 g / m ^{2 to} 10 g / m ² (dry state), more preferably from 1 g / m ^{2 to} 5 g / m ² (dry state).

  The adhesive layer 27 has a thickness of preferably 0.5 μm or more and 5 μm or less, more preferably 1 μm or more and 3 μm or less.

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

  First, the above-mentioned paper base material layer 14 is prepared. Subsequently, the above-described ink composition is applied onto the paper base layer 14 by offset printing, and the ink composition on the paper base layer 14 is irradiated with ultraviolet rays to form the print layer 12 on the paper base layer 14. Form. Subsequently, the printing layer 12 formed on the paper base layer 14 and the film constituting the surface resin layer 11 are laminated via an adhesive layer 27 made of an emulsion-type laminating adhesive. Thereby, the packaging material 20 including the surface resin layer 11, the adhesive layer 27, the printing layer 12, and the paper base layer 14 can be obtained. As a method of applying the ink composition onto the paper base layer 14, an offset method is used in which the ink composition is once transferred from the plate to a transfer material, and the ink composition is applied onto the paper base layer 14 via the transfer material. Etc. can be used.

<Packaging products>
An example of a packaged product formed by using the packaging material 20 will be described. FIG. 2 is an example of a packaged product 20A formed by using the packaging material 20 shown in FIG. The packaged product 20A is a general paper container such as an outer box for sweets, a paper box for bottles, and an outer box for medicines.

  By configuring the packaged product 20A using the packaging material 20 including the printed layer 12 containing the biomass-derived component, it is possible to reduce the amount of fossil fuel used compared to the related art. Thereby, environmental load can be reduced.

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

[Example 1A]
Card paper having a basis weight of 310 g / m ² was prepared as the paper base layer 14. Subsequently, the printing layer 12 was formed on the paper base layer 14. In the step of forming the print layer 12, first, an ink composition containing a colorant, 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, an isocyanate compound derived from a fossil fuel, and a hydroxy (meth) acrylate derived from a fossil fuel, 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 a fossil fuel was used. Subsequently, the ink composition is applied on the paper base layer 14 in a predetermined pattern by offset printing, and the ink composition on the paper base layer 14 is irradiated with ultraviolet light to form a print layer on the paper base layer 14. No. 12 was formed. The thickness of the printing layer 12 was 1 μm.

  Subsequently, the print layer 12 formed on the paper base material layer 14 and the film constituting the surface resin layer 11 were bonded via the adhesive layer 27. In the step of forming the surface resin layer 11, first, a paint containing a binder resin and a solvent was prepared. As the surface resin layer 11, a PET film (thickness: 12 μm) containing fossil fuel-derived polyethylene terephthalate was used. As the adhesive for the adhesive layer 27, an emulsion-type adhesive was used. The thickness of the adhesive layer 27 was 2 μm. Thus, the packaging material 20 having the layer configuration shown in FIG. 1 was produced.

The layer configuration of the packaging material 20 of this embodiment is expressed as follows.
Table / Contact / Biomark / Paper “/” indicates layer boundaries. The leftmost layer is a layer constituting the outer surface of the packaging material, and the rightmost layer is a layer constituting the inner surface of the packaging material.
“Table” means the surface resin layer. "Contact" means the adhesive layer. “Biomark” means a printed layer derived from biomass. "Paper" means a paper substrate layer.

  Subsequently, the paper container 20A shown in FIG. The paper container 20A can be used, for example, as an outer box for confectionery, an outer box for medicines, or the like.

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

[Example 1C]
Bio-urethane (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. Except for the above, a packaging material 20 was produced in the same manner as in Example 1A.

FIG. 3 shows the layer configuration of the packaging material 20 of Examples 1A to 1C. In the column of “biomass-derived component in print layer” in FIG. 3, the description “binder resin” means that the binder resin used in the print layer contains a biomass-derived component. Further, in the column of "biomass-derived component in binder resin", the description "polyol" means that the polyol used in the binder resin of the printing layer contains a biomass-derived component. Further, 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", the description "ester type" means that the polyol used in the binder resin of the printing layer is a polyester polyol.
Further, in the column of "biomass-derived component in polyol", the description "polyfunctional alcohol" means that among the components used in the polyol of the binder resin of the printing layer, at least the polyfunctional alcohol of the polyester polyol is derived from biomass. Means Similarly, the description “polyfunctional carboxylic acid” means that among the components used in the polyol of the binder resin of the printing layer, at least the polyfunctional carboxylic acid of the polyester polyol is derived from biomass. The description "-" means that the polyol of the binder resin of the printing layer does not contain a biomass-derived component.

  In Examples 1A to 1C, in the binder resin of the printing layer, one of the three constituent elements 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, the present invention is not limited to this. For example, two of the three components may include a biomass-derived component, and all three components may include a biomass-derived component.

[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 of the binder resin of the printing 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 1E]
Packaging was performed 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 print layer 12. Material 20 was produced.

[Example 1F]
As a binder resin of the printing layer 12, 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. Except for this, the packaging material 20 was produced in the same manner as in Example 1D.

  FIG. 3 shows the layer configuration of the packaging material 20 of Examples 1D to 1F. In the column of “type of polyol” in FIG. 3, the description “ether type” means that the polyol used in the binder resin of the printing layer is a polyether polyol. Further, in the column of "biomass-derived component in polyol", the description "polyfunctional isocyanate" means that at least the polyfunctional isocyanate among components used in the polyol of the binder resin of the printing layer is derived from biomass. .

  In Examples 1D to 1F, in the binder resin of the printing layer, one of the three constituent elements of the polyfunctional polyol or the polyfunctional isocyanate used in the polyether polyol or the isocyanate compound is a biomass-derived component. Although an example is shown, the present invention is not limited to this. For example, two of the three components may include a biomass-derived component, and all three components may include a biomass-derived component.

[Example 1G]
A packaging material 20 was prepared in the same manner as in Example 1A, except that polycarbonate polyol was used as the polyol of the binder resin of the print layer 12. Specifically, a reaction product of a polyfunctional alcohol containing a biomass-derived component and a carbonate derived from a fossil fuel was used as the polycarbonate polyol.

[Example 1H]
Bio urethane (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 as the binder resin of the print layer 12. Except for the above, a packaging material 20 was produced in the same manner as in Example 1G.

  FIG. 3 collectively shows the layer configuration of the packaging material 20 of Examples 1G and 1H. In the column of “polyol type” in FIG. 3, the description “carbonate” means that the polyol used in the binder resin of the printing layer is a polycarbonate polyol.

  In Examples 1G and 1H, in the binder resin of the printing layer, an example is shown in which one of the two components, that is, the polyfunctional alcohol used for the polycarbonate polyol or the isocyanate compound is a biomass-derived component. However, it is not limited to this. For example, both of the two components may include a biomass-derived component.

[Example 1I]
A packaging material 20 was produced in the same manner as in Example 1A, except that a polyethylene terephthalate film containing a component derived from biomass was used as the polyethylene terephthalate film of the surface resin layer 11.

The layer configuration of the packaging material 20 of this embodiment is expressed as follows.
Bio table / contact / bio stamp / paper “Bio table” means a surface resin layer derived from biomass.

  FIG. 3 shows the layer configuration of the packaging material 20 of Example 1I. Note that the same variation as in the case of the embodiments 1A to 1H can be adopted also in the embodiment 1I. For example, as the print layer containing the biomass-derived component, the print layer shown in Examples 1B to 1H may be used in addition to the print layer shown in Example 1A.

[Example 2A]
A packaging material 20 was prepared in the same manner as in Example 1A, except that a fossil fuel-derived polyethylene film (thickness: 30 μm) was used as the surface resin layer 11.

The layer configuration of the packaging material 20 of this embodiment is expressed as follows.
Table / Contact / Biomark / Paper

[Example 2B]
A packaging material 20 was produced in the same manner as in Example 2A, except that a biomass-derived component was used as the polyethylene film of the surface resin layer 11.

The layer configuration of the packaging material 20 of this embodiment is expressed as follows.
Bio table / contact / bio stamp / paper

[Example 3]
A packaging material 20 was produced in the same manner as in Example 1A, except that a fossil fuel-derived polypropylene film (thickness: 20 μm) was used as the surface resin layer 11.

The layer configuration of the packaging material 20 of this embodiment is expressed as follows.
Table / Contact / Biomark / Paper

  FIG. 4 shows the layer configuration of the packaging material 20 of Examples 2A to 3 together with the layer configuration of the packaging material 20 of Examples 1A and 1I. Note that the same variations as those in the examples 1A to 1H can be adopted in the above-described examples 2A to 3 also. For example, as the print layer containing the biomass-derived component, the print layer shown in Examples 1B to 1H may be used in addition to the print layer shown in Example 1A.

11 Surface resin layer 12 Printing layer 14 Paper base layer 20 Packaging material 20A Packaging product 27 Adhesive layer

Claims (5)

At least, a packaging material in which a surface resin layer, a printing layer, and a paper base layer are sequentially laminated,
The surface resin layer includes polyethylene, polyethylene terephthalate, or polypropylene,
The printing layer includes a colorant, a urethane (meth) acrylate that is a reaction product of a polyol, an isocyanate compound, and hydroxy (meth) acrylate,
A packaging material, wherein at least one of the polyol, the isocyanate compound, or the hydroxy (meth) acrylate contains a biomass-derived component.   The packaging material according to claim 1, wherein the polyol includes a biomass-derived component.   The packaging material according to claim 1, wherein the isocyanate compound contains a biomass-derived component.   The packaging material according to any one of claims 1 to 3, wherein the surface resin layer has polyethylene or polyethylene terephthalate containing a biomass-derived component.   A packaged product comprising the packaging material according to any one of claims 1 to 4.