JP2022028891A - Packaging material and packaging product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material with an improved degree of biomass.

SOLUTION: A packaging material at least has a substrate layer, a printed layer, an adhesive layer, and a sealant layer. The adhesive layer is in contact with the sealant layer. The adhesive layer has a cured product of a polyol and an isocyanate compound. The polyol of the adhesive layer is a polyester polyol that is a reactant between a polyfunctional alcohol and a polyfunctional carboxylic acid, and the polyfunctional carboxylic acid of the adhesive layer consists of only biomass-derived components.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

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

Conventionally, various packaging materials have been developed and proposed as packaging materials for constituting packaging products for filling and packaging various articles such as foods and drinks, pharmaceuticals, chemicals, cosmetics, hygiene products, daily necessities and the like. The packaging material is composed of a laminate in which a base material layer containing stretched plastic or the like and a sealant layer for welding the packaging materials are laminated at least. Usually, the laminate further includes a print layer for forming a print pattern and an adhesive layer for joining the respective layers of the laminate.

In recent years, with the growing demand for the construction of a sound material-cycle society, in the field of laminates that make up packaging materials, as in the field of energy, it is desired to break away from fossil fuels, and the use of biomass is drawing attention. There is. Biomass is an organic compound photosynthesized from carbon dioxide and water, and by using it, it becomes carbon dioxide and water again, so-called carbon-neutral renewable energy. In recent years, the practical use of biomass plastics made from these biomass materials is rapidly advancing, and attempts are being made to manufacture various resins from biomass raw materials.

As a resin derived from biomass, polylactic acid (PLA), which is produced via lactic acid fermentation, started commercial production in advance, but its biodegradable and other plastic performance is currently a general-purpose plastic. Because it is very different from the above, there are limits to the product applications and product manufacturing methods, and it has not been widely used. In addition, life cycle assessment (LCA) evaluation is being conducted for PLA, and discussions are being held on energy consumption during PLA manufacturing and equivalence when replacing general-purpose plastics.

Here, as the general-purpose plastic, various types such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, and polyester are used. In particular, polyethylene is molded into films, sheets, bottles and the like, and is used for various purposes such as packaging materials, and is widely used all over the world. Therefore, using polyethylene derived from conventional fossil fuels has a large environmental load. Therefore, it is desired to reduce the amount of fossil fuel used in the production of polyethylene by using a raw material derived from biomass. For example, to date, research has been conducted on producing ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see Patent Document 1).

In addition, polyester is widely used in various industrial applications because it has excellent mechanical properties, chemical stability, heat resistance, transparency, and the like, and is inexpensive. Polyester is obtained by polycondensing a diol unit and a dicarboxylic acid unit. For example, polyethylene terephthalate (hereinafter, may be abbreviated as PET) is obtained by subjecting ethylene glycol and terephthalic acid as raw materials to an esterification reaction. After that, it is manufactured by polycondensation reaction. These raw materials are produced from petroleum, which is a fossil resource, for example, ethylene glycol is industrially produced from ethylene and terephthalic acid is industrially produced from xylene.

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

Japanese Patent Publication No. 2011-506628 Japanese Unexamined Patent Publication No. 2012-96410

In the conventional packaging material, the printed layer and the adhesive layer of the laminate are formed of a material derived from fossil fuel, which has been a cause of lowering the biomass degree of the entire packaging material. Therefore, in a packaging material composed of a laminate including a base material layer, a printing layer, an adhesive layer, and a sealant layer, it is required to further increase the biomass degree of the entire packaging material.

The present invention has been made in consideration of such a point, and an object of the present invention is to provide a packaging material having a high degree of biomass.

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

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

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

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

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

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

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

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

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

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

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

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

According to the present invention, the biomass degree of the packaging material can be increased.

It is a schematic cross-sectional view which shows an example of the packaging material by this invention. It is a schematic cross-sectional view which shows an example of the packaging material by this invention. It is a schematic cross-sectional view which shows an example of the packaging material by this invention. It is a schematic cross-sectional view which shows an example of the packaging material by this invention. It is a schematic front view which shows an example of the packaged product by this invention. It is a schematic front view which shows an example of the packaged product by this invention. It is a schematic front view which shows an example of the packaged product by this invention. It is a schematic front view which shows an example of the packaged product by this invention. It is a schematic front view which shows an example of the packaged product by this invention. It is a figure which shows the layer structure of the packaging material of Examples 1A to 1L. It is a figure which shows the layer structure of the packaging material of Examples 1A, 2A-11.

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

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

The laminate constituting the packaging material preferably has a thickness of 10 μm or more and 500 μm or less, more preferably 20 μm or more and 300 μm or less, and further preferably 30 μm or more and 200 μm or less.

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

The laminate constituting the packaging material according to the present invention will be described with reference to the drawings. Examples of schematic cross-sectional views of the packaging material 10 according to the present invention are shown in FIGS. 1 to 4. In FIGS. 1 to 4, reference numeral 10y represents an outer surface of the packaging material 10, and reference numeral 10x represents an inner surface of the packaging material 10. The inner surface 10x is a surface of a packaged product such as a bag formed of the packaging material 10 that is located on the side of the contents contained in the packaged product. Further, the outer surface 10y is a surface located on the opposite side of the inner surface 10x. In the present application, the term "order" in the description such as "preparing in this order" or "stacked in order" indicates an order in the direction from the outer surface 10y side to the inner surface 10x side unless otherwise specified.

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

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

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

Further, in the packaging material 10 shown in FIG. 4, a first barrier layer 61 is provided between the base film 22 of the packaging material 10 of FIG. 1 and the printing layer 50, and the adhesive layer 30 and the sealant film 42 are further formed. A second barrier layer 62 is provided between the two.

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

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

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

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

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

Biomass polyester has ethylene glycol derived from biomass as a diol unit and dicarboxylic acid derived from fossil fuel as a dicarboxylic acid unit. In addition to the biomass polyester, the base material layer 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. It suffices if the following biomass degree can be realized for the entire base material layer. In the present invention, since the base material layer contains biomass polyester, the amount of polyester derived from fossil fuel can be reduced and the environmental load can be reduced as compared with the conventional case.

In the present invention, the "biomass degree" may be indicated by a measured value of the carbon content derived from biomass by radiocarbon (C14) measurement, or may be indicated by the weight ratio of the biomass-derived component.

When the value obtained by measuring the carbon content derived from biomass by radiocarbon (C14) measurement is shown as "biomass degree", the "biomass degree" can be obtained as follows. That is, since carbon dioxide in the atmosphere contains C14 at a constant ratio (105.5 pMC), the content of C14 in plants that grow by taking in carbon dioxide in the atmosphere, for example, corn, is also about 105.5 pMC. Is known to be. It is also known that fossil fuels contain almost no C14. Therefore, the ratio of carbon derived from biomass can be calculated by measuring the ratio of C14 contained in all carbon atoms in polyester. In the present invention, when the content of _C14 in the polyester is PC14, the carbon content P _bio derived from biomass can be obtained as follows.
P _bio (%) = _PC14 / 105.5 × 100
Note that pMC is an abbreviation for Percent Modern Carbon.

Taking polyethylene terephthalate, which is a typical polyester, as an example, polyethylene terephthalate is obtained by polymerizing ethylene glycol containing a 2-carbon atom and terephthalic acid containing an 8-carbon atom at a molar ratio of 1: 1 and thus ethylene glycol. When only those derived from biomass are used, the carbon content _Pbio derived from biomass in polyethylene terephthalate is 20%. On the other hand, the content of carbon derived from biomass in the polyethylene terephthalate derived from fossil fuel produced by using ethylene glycol derived from fossil fuel and dicarboxylic acid derived from fossil fuel is 0%, which is the same as that of polyethylene terephthalate derived from fossil fuel. The biomass level is 0%.

Further, when the "biomass degree" is expressed by the weight ratio of the biomass-derived component, the "biomass degree" can be obtained as follows. For example, taking polyethylene terephthalate as an example, polyethylene terephthalate is ethylene glycol containing ethylene glycol containing 2 carbon atoms and terephthalic acid containing 8 carbon atoms polymerized at a molar ratio of 1: 1 as described above. When only the glycol derived from biomass is used, the weight ratio of the biomass-derived component in the polyester is about 30%, so that the degree of biomass is about 30%. Further, the weight ratio of the biomass-derived component in the fossil fuel-derived polyester produced by using the fossil fuel-derived ethylene glycol and the fossil fuel-derived dicarboxylic acid is 0%, and the biomass degree of the fossil fuel-derived polyester is It becomes 0%. Hereinafter, unless otherwise specified, "biomass degree" means the weight ratio of biomass-derived components.

When the base film 22 contains a biomass-derived component, the biomass degree in the base film 22 is 5% or more, preferably 10% or more and 30% or less, and more preferably 15% or more and 25% or less. .. When the biomass content in the base film 22 is 5% or more, the amount of polyester derived from fossil fuel can be reduced and the environmental load can be reduced as compared with the conventional case.

Biomass-derived ethylene glycol is made from ethanol (biomass ethanol) produced from biomass as a raw material. For example, biomass-derived ethylene glycol can be obtained from biomass ethanol by a method for producing ethylene glycol via ethylene oxide by a conventionally known method. Further, commercially available biomass ethylene glycol may be used, and for example, biomass ethylene glycol commercially available from India Glycol Co., Ltd. can be preferably used.

As the dicarboxylic acid unit of biomass polyester, a dicarboxylic acid derived from fossil fuel is used. As the dicarboxylic acid, aromatic dicarboxylic acid, aliphatic dicarboxylic acid, and derivatives thereof can be used without limitation. Examples of the aromatic dicarboxylic acid include terephthalic acid and isophthalic acid, and examples of the derivative of the aromatic dicarboxylic acid include lower alkyl esters of the aromatic dicarboxylic acid, specifically, methyl ester, ethyl ester, propyl ester and butyl. Esters and the like can be mentioned. Among these, terephthalic acid is preferable, and dimethyl terephthalate is preferable as the derivative of the aromatic dicarboxylic acid.

Specific examples of the aliphatic dicarboxylic acid include oxalic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid and cyclohexanedicarboxylic acid, which usually have 2 or more and 40 or less carbon atoms. Examples thereof include chain-like or alicyclic dicarboxylic acids. Further, as the derivative of the aliphatic dicarboxylic acid, a lower alkyl ester such as a methyl ester, an ethyl ester, a propyl ester and a butyl ester of the aliphatic dicarboxylic acid and a cyclic acid anhydride of the aliphatic dicarboxylic acid such as succinic anhydride can be used. Can be mentioned. Among these, adipic acid, succinic acid, dimer acid or a mixture thereof is preferable, and succinic acid as a main component is particularly preferable. As the derivative of the aliphatic dicarboxylic acid, a methyl ester of adipic acid and succinic acid, or a mixture thereof is more preferable. These dicarboxylic acids can be used alone or in admixture of two or more.

The biomass polyester may be a copolymerized polyester in which a copolymerization component is added as a third component in addition to the above-mentioned diol component and dicarboxylic acid component. Specific examples of the copolymerization component include a bifunctional oxycarboxylic acid, a trifunctional or higher polyhydric alcohol for forming a crosslinked structure, a trifunctional or higher polyvalent carboxylic acid and / or an anhydrate thereof, and 3 Examples thereof include at least one polyfunctional compound selected from the group consisting of functional or higher oxycarboxylic acids. Among these copolymerization components, a bifunctional and / or trifunctional or higher oxycarboxylic acid is particularly preferably used because a copolymerized polyester having a high degree of polymerization tends to be easily produced. Among them, the use of a trifunctional or higher functional oxycarboxylic acid is most preferable because a polyester having a high degree of polymerization can be easily produced in a very small amount without using a chain extender described later.

Biomass polyester can be obtained by a conventionally known method of polycondensing the above-mentioned diol unit and dicarboxylic acid unit. Specifically, a general method of melt polymerization such as performing an esterification reaction and / or an ester exchange reaction between the above dicarboxylic acid component and the diol component and then performing a polycondensation reaction under reduced pressure, or an organic solvent. It can be produced by a known solution heating dehydration condensation method using the above. The amount of diol used in producing the biomass polyester is substantially equimolar with respect to 100 mol of the dicarboxylic acid or its derivative, but generally, esterification and / or transesterification reaction and / or polycondensation reaction. It is preferable to use an excessive amount of 0.1 mol% or more and 20 mol% or less because there is distillate inside.

The base film 22 can be formed by, for example, forming a film by the T-die method using a resin composition of biomass polyester or a resin composition containing biomass polyester and polyester derived from fossil fuel. Specifically, after the above-mentioned resin composition is dried, it is supplied to a melt extruder heated to a temperature of the melting point Tm or more of the resin composition to a temperature of Tm + 70 ° C. to melt the resin composition, for example. The base film 22 can be formed by extruding a sheet-like material from a die such as a T-die and quenching and solidifying the extruded sheet-like material 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 and the like can be used depending on the purpose.

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

When the base film 22 is formed of a material that does not contain a biomass-derived component, the base film 22 may be, for example, a polyester film such as polyethylene terephthalate film or polybutylene terephthalate, a polyolefin film such as a polyethylene film or a polypropylene film, or a nylon film. , Nylon 6 / Metaxylylene diamine Nylon 6 co-pressed co-stretched film, or polypropylene / ethylene-vinyl alcohol copolymer co-pressed co-stretched film, or composite film in which two or more of these films are laminated. A plastic film can be used. The plastic film may be coated with polyvinyl alcohol or the like.

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

The vertically stretched film is subsequently subjected to each of the treatment steps of lateral stretching, heat fixing, and heat relaxation to obtain a biaxially stretched film. The transverse stretching is usually performed in a temperature range of 50 ° C. or higher and 100 ° C. or lower. The ratio of lateral stretching depends on the required characteristics of this application, but is preferably 2.5 times or more and 5.0 times or less. If it is less than 2.5 times, the thickness unevenness of the film becomes large and it is difficult to obtain a good film, and if it exceeds 5.0 times, breakage is likely to occur during film formation.

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

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

The base film 22 may be a single-layer film or a co-pressed film having two or more layers.

(Print layer)
The print layer 50 is a layer formed by printing for decoration, display of contents, display of best-by date, display of manufacturers, sellers, etc., display of other items, and addition of aesthetics. The print layer 50 includes, for example, a pattern layer that forms a desired arbitrary pattern such as a picture, a photograph, characters, numbers, figures, symbols, and patterns. The print layer may further include a ground color layer formed by printing so as to make the pattern of the pattern layer stand out. The printing layer 50 contains a colorant and a cured product of a polyol and an isocyanate compound. The printing layer 50 may or may not contain a biomass-derived component. When the print layer 50 is formed of a material containing a biomass-derived component, the print layer 50 may be formed by using a cured product in which at least one of a polyol as a main agent and an isocyanate compound as a curing agent contains a biomass-derived component. can. When the print layer 50 is formed of a material that does not contain a biomass-derived component, the print layer 50 may be formed by using a conventionally known polyol made of a fossil fuel-derived component and an isocyanate compound made of a fossil fuel-derived component. can. As the polyol, a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid, or a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate can be used.

[Polyester polyol]
When the polyester polyol contains a biomass-derived component, at least one of the polyfunctional alcohol and the polyfunctional carboxylic acid contains the biomass-derived component. The following examples can be given as polyester polyols containing biomass-derived components.
・ Biomass-derived polyfunctional alcohol and biomass-derived polyfunctional carboxylic acid reaction product ・ Biomass fuel-derived polyfunctional alcohol and biomass-derived polyfunctional carboxylic acid reaction product ・ Biomass-derived polyfunctional alcohol and fossil fuel-derived Reactant with polyfunctional carboxylic acid

As the biomass-derived polyfunctional alcohol, an aliphatic polyfunctional alcohol obtained from plant raw materials such as corn, sugar cane, cassava, and sago palm can be used. Examples of the biomass-derived aliphatic polyfunctional alcohol include polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG), diethylene glycol (DEG), and butylene obtained from plant raw materials by the following methods. There are glycol (BG), hexamethylene glycol and the like, 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 method in which glucose is obtained by decomposing plant raw materials. Polypropylene glycol produced by a bio method such as the above fermentation method can obtain useful by-products such as lactic acid from the viewpoint of safety as compared with polypropylene glycol produced by the EO method, and can keep the production cost low. It is also preferable that it is possible.
Biomass-derived butylene glycol can be produced by producing succinic acid obtained by producing glycol from a plant raw material and fermenting it, 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, the polyfunctional alcohol derived from fossil fuel is not particularly limited, and conventionally known alcohols can be used. For example, polypropylene glycol (PPG), neopentyl glycol (NPG), ethylene glycol (EG) can be used. , Diethylene Glycol (DEG), Butylene Glycol (BG), Hexamethylene Glycol, Triethylene Glycol, Dipropylene Glycol, 1,4-Cyclohexanedimethanol, Trimethylol Propane, Glycerin, 1,9-Nonanediol, 3-Methyl -1,5-Pentylene diol, 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.

As the polyfunctional carboxylic acid derived from biomass, reproducible soybean oil, flaxseed oil, tung oil, palm oil, palm oil, castor oil and other plant-derived oils, and recycled waste cooking oil mainly composed of these oils are recycled. 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 with heptyl alcohol as a by-product by alkaline pyrolysis 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.

As the polyfunctional carboxylic acid derived from fossil fuel, an aliphatic polyfunctional carboxylic acid or an aromatic polyfunctional carboxylic acid can be used. The aliphatic polyfunctional carboxylic acid derived from the fossil fuel is not particularly limited, and conventionally known ones can be used. For example, adipic acid, dodecanedioic acid, tetrahydrophthalic acid anhydride, hexahydrophthalic acid anhydride, maleine anhydride can be used. Examples thereof include acids, adipic anhydride, sebacic acid, succinic acid, glutaric acid, and dimeric acids, and ester compounds thereof. Further, 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, etc. can be used. And pyromellitic acid, 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. The following examples can be given as a polyether polyol containing a biomass-derived component.
・ Biomass-derived polyfunctional alcohol and biomass-derived polyfunctional isocyanate reaction product ・ Biomass fuel-derived polyfunctional alcohol and biomass-derived polyfunctional isocyanate reaction product ・ Biomass-derived polyfunctional alcohol and fossil fuel-derived polyfunctional Reactant with functional isocyanate

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

As the polyfunctional isocyanate derived from biomass, a divalent carboxylic acid derived from a plant is acid-amided and reduced to convert it into a terminal amino group, and further reacted with phosgen to convert the amino group into 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 diimate diisocyanate (DDI), octamethylene diisocyanate, and decamethylene diisocyanate. Further, 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 to an isocyanate group. Further, 1,5-pentamethylene diisocyanate is obtained by decarboxylating the carboxyl group of lysine and then converting the amino group into an isocyanate group.

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

The polyfunctional isocyanate derived from the fossil fuel is not particularly limited, and conventionally known substances can be used. For example, toluene-2,4-diisocyanate, 4-methoxy-1,3-phenylenediisocyanate, 4-isopropyl- 1,3-phenylene diisocyanate, 4-chlor-1,3-phenylenediisocyanate, 4-butoxy-1,3-phenylenediisocyanate, 2,4-diisocyanate diphenyl ether, 4,4'-methylenebis (phenylene isocyanate) (MDI), Examples thereof include aromatic diisocyanates such as juliylene diisocyanate, trizine diisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalenedi isocyanate, benzidine diisocyanate, o-nitrobenzidine diisocyanate, and 4,4'-diisocyanate dibenzyl. Also, aliphatic diisocyanates such as methylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate and 1,10-decamethylene diisocyanate; 1,4-cyclohexamethylene diisocyanate and 4,4-methylene bis (cyclohexamethylene diisocyanate). ), 1,5-Tetrahydronaphthalenediisocyanate, isophorone diisocyanate, hydrogenated MDI, hydrogenated XDI and other alicyclic diisocyanates. These may be used alone or in combination of two or more.

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

When the print layer 50 contains a biomass-derived component, the print layer 50 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 biomass level is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be reduced.

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

The print layer 50 has a thickness of preferably 0.1 μm or more and 10 μm or less, more preferably 1 μm or more and 5 μm or less, and further preferably 1 μm or more and 3 μm or less.

(Adhesive layer)
The adhesive layer 30 is a layer that functions to bond the printing layer 50 and the sealant layer 40 that make up the packaging material 10. Further, when the barrier layer 60 such as a thin-film deposition layer is included between the adhesive layer 30 and the sealant layer 40, it goes without saying that the adhesive layer 30 fulfills the function of adhering the printing layer 50 and the barrier layer 60. stomach. The adhesive layer 30 contains a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component.

As the isocyanate compound containing the biomass-derived component in the adhesive layer 30, an isocyanate compound containing the same biomass-derived component as the above-mentioned printing layer 50 can be used. Further, in the adhesive layer 30, as the polyol containing the biomass-derived component, the same polyol as the above-mentioned printing layer 50 can be used. When both the print layer 50 and the adhesive layer 30 are formed by using a cured product containing a biomass-derived component, the cured product in the printed layer 50 and the cured product in the adhesive layer 30 may have the same composition. , Different compositions may be used.

The adhesive layer 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 biomass level is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be reduced.

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

The adhesive layer preferably has a thickness of 0.1 μm or more and 10 μm or less, more preferably 1 μm or more and 6 μm or less, and further preferably 2 μm or more and 5 μm or less.

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

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

For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use fermented ethanol derived from biomass obtained from plant raw materials. The plant material is 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 that has been 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, and then purified. Conventionally known methods such as distillation, membrane separation, and extraction can be applied to the purification of ethanol from the culture broth. For example, a method of adding benzene, cyclohexane or the like and azeotropically boiling, or removing water by membrane separation or the like can be mentioned.

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

The above-mentioned α-olefin has no particular limitation on the number of carbon atoms, but usually one having 3 to 20 carbon atoms can be used, and it is 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. Further, by containing such an α-olefin, the polymerized polyolefin has an alkyl group as a branched structure, so that it can be made more flexible than a simple linear one.

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

The biomass polyolefin may contain two or more kinds of biomass polyolefins having different biomass degrees, and the biomass degree of the entire polyolefin resin layer may be within the range described 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, and further preferably 0.915 g / cm ³ or more and 0. It has a density of 925 g / cm ³ or less. The density of the biomass polyolefin is a value measured according to the method specified in the method A of JIS K7112-1980 after performing the annealing described in JIS K6760-1980. When the density of the biomass polyolefin is 0.91 g / cm ³ or more, the rigidity of the polyolefin resin layer containing the biomass polyolefin can be increased, and it can be suitably used as the inner layer of the packaged product. Further, when 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 the packaged product.

The biomass polyolefin has a melt flow of 0.1 g / 10 minutes or more and 10 g / 10 minutes or less, preferably 0.2 g / 10 minutes or more and 9 g / 10 minutes or less, and more preferably 1 g / 10 minutes or more and 8.5 g / 10 minutes or less. It has a rate (MFR). The melt flow rate is a value measured by the method A under the conditions of a temperature of 190 ° C. and a load of 21.18 N in the method specified in JIS K7210-1995. When the MFR of the biomass polyolefin is 0.1 g / 10 minutes or more, the extrusion load during the molding process can be reduced. Further, when the MFR of the biomass polyolefin is 10 g / 10 minutes or less, the mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be increased.

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

Examples of the thermoplastic resin derived from the fossil fuel include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, polypropylene, propylene-ethylene copolymer, and ethylene-vinyl acetate copolymer. Examples thereof include an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, an ethylene-methyl acrylate copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methyl methacrylate copolymer, and an ionomer.

The sealant layer may be formed by dry laminating a sealant film on the printing layer on the base material layer side via an adhesive layer, or by a melt extrusion laminating method, the above-mentioned thermoplastic resin is placed on the adhesive layer side. A sealant layer may be formed by extruding and forming a film. Further, when the melt extrusion laminating method is adopted, an anchor coat layer formed by applying an anchor coat agent to the surface of the adhesive layer and drying it may be provided. Examples of the anchor coating agent include any resin having a heat resistant temperature of 135 ° C. or higher, for example, an anchor coating agent made of a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin, polyethyleneimine, or the like. An anchor coating agent which is a cured product of a polyacrylic or polymethacrylic resin (polyester) having two or more hydroxyl groups and an isocyanate compound as a curing agent can be preferably used. Further, a silane coupling agent may be used in combination with this as an additive, or nitrified cotton may be used in combination to enhance heat resistance.

The dried anchor coat layer has a thickness of 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The dried adhesive layer has a thickness of 1 μm or more and 10 μm or less, preferably 2 μm or more and 5 μm or less. The adhesive resin layer preferably has a thickness of 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

The sealant layer 40 preferably has a biomass degree of 5% or more, more preferably 5% or more and 60% or less, and further preferably 10% or more and 60% or less. If the biomass level is within the above range, the amount of fossil fuel used can be reduced and the environmental load can be reduced. Although the biomass degree is a value shown by weight ratio, it can also be shown as a value obtained by measuring the carbon content derived from biomass by radiocarbon (C14) measurement. That is, the ratio of carbon derived from biomass can be calculated by measuring the ratio of C14 contained in all carbon atoms in the sealant layer. When the content of _C14 in the sealant layer is PC14, the carbon content P _bio derived from biomass is the same as above, and the following formula P _bio (%) = _PC14 / 105.5 × 100.
Can be obtained by. The biomass degree of polyethylene produced using ethylene, which is a raw material derived from biomass, can be expressed as a weight ratio or as a value obtained by measuring the content of carbon derived from biomass by radiocarbon (C14) measurement. It will be the same value.

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

The sealant layer 40 has a thickness of preferably 10 μm or more and 300 μm or less, more preferably 20 μm or more and 200 μm or less, and further preferably 30 μm or more and 150 μm or less.

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

(Metal leaf)
As the metal foil constituting the barrier layer, a conventionally known metal foil can be used. Aluminum foil is preferable from the viewpoint of gas barrier property that blocks the transmission of oxygen gas, water vapor, and the like, and light-shielding property that blocks the transmission of visible light, ultraviolet rays, and the like. Further, since the packaging bag can be given a metallic luster, the design can be improved. The thickness of the metal foil is, for example, 5 μm or more and 15 μm or less.

(Embedded layer)
The thin-film layer 60 is a thin-film film made of an inorganic substance and / or an inorganic oxide. The thin-film film can be formed by a conventionally known method using a conventionally known inorganic substance or an inorganic oxide, and the composition and the forming method thereof are not particularly limited. The packaging material 10 may have two or more thin-film deposition layers 60. When two or more thin-film deposition layers 60 are provided, they may have the same composition or different compositions.

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

The vapor-filmed film of an inorganic oxide such as silicon oxide or aluminum oxide has transparency. When the vapor deposition layer 60 is located on the outer surface 10y side of the print layer 50, a transparent inorganic oxide vapor deposition film is used as the vapor deposition layer 60.

The notation of the inorganic oxide is MO _X such as SiO _X , AlO _X , etc. (However, in the formula, M represents an inorganic element, and the value of X has a range different depending on the inorganic element). expressed. The range of the value of X is 0 to 2 for silicon (Si), 0 to 1.5 for aluminum (Al), 0 to 1 for magnesium (Mg), and 0 to 1 for calcium (Ca). Potassium (K) is 0 to 0.5, tin (Sn) is 0 to 2, sodium (Na) is 0 to 0.5, boron (B) is 0 to 1, 5, and titanium (Ti). Can take a value in the range of 0 to 2, lead (Pb) of 0 to 1, zirconium (Zr) of 0 to 2, and yttrium (Y) of 0 to 1.5. In the above, when X = 0, it is a completely inorganic simple substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are preferably used as the vapor deposition layer 60 of the packaging material 10, with silicon (Si) being 1.0 to 2.0 and aluminum (Al) being 0.5 to 1. Values in the range of .5 can be used.

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

The thin-film deposition layer 60 can be formed on the base material layer 20, the sealant layer 40, or the like by using the following forming method. Examples of the method for forming the vapor deposition layer 60 include a physical vapor deposition method (PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method, or a plasma chemical vapor deposition method and heat. Examples thereof include a chemical vapor deposition method, a chemical vapor deposition method such as a photochemical vapor deposition method, and a CVD method.

(Gas barrier coating film)
The gas barrier coating film is a film provided on the thin-film deposition layer as needed. The gas barrier coating film functions as a layer that suppresses the permeation of oxygen gas, water vapor, and the like. The gas barrier coating film has a general formula of R ¹ _n M (OR ² ) _m (wherein, in the formula, R ¹ and R ² represent organic groups having 1 to 8 carbon atoms, M represents a metal atom, and n. Represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents the valence of M.) At least one or more alkoxides and a polyvinyl alcohol system as described above. It is obtained by a gas barrier composition containing a resin and / or an ethylene / vinyl alcohol copolymer and further being polycondensed by the solgel method in the presence of a solgel method catalyst, acid, water and an organic solvent.

As the alkoxide represented by the above general formula R ¹ _n M (OR ² ) _m , at least one or more of a partial hydrolyzate of the alkoxide and a condensate of the hydrolysis of the alkoxide can be used. Further, as the partial hydrolyzate of the above alkoxide, it is not necessary that all of the alkoxy groups are hydrolyzed, and one or more of them may be hydrolyzed, or a mixture thereof. As the condensate of hydrolysis of alkoxide, one having a dimer or more of a partially hydrolyzed alkoxide, specifically, one having a dimer of 2 to 6 is used.

In the above-mentioned alkoxide represented by the general formula R ¹ _n M (OR ² ) _m , silicon, zirconium, titanium, aluminum, or the like can be used as the metal atom represented by M. In the present embodiment, examples of the preferred metal include silicon and titanium. Further, in the present invention, the alkoxide may be used alone or by mixing alkoxides of two or more different metal atoms in the same solution.

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

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

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

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

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

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

The packaging material 10 is provided with a chemical function, an electrical function, a magnetic function, a mechanical function, a friction / wear / lubrication function, an optical function, a thermal function, a surface function such as biocompatibility, and the like. , It is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metallizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, etc.) Coating, etc.) and the like. Further, the packaging material according to the present invention may be subjected to laminating processing (dry laminating or extruded laminating), bag making processing, and other post-treatment processing to produce a molded product.

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

Packaging products provided with packaging materials include, for example, food and drink, fruit juice, juice, drinking water, liquor, cooked foods, marine products, frozen foods, meat products, boiled foods, rice cakes, liquid soups such as pot soups, etc. It can be suitably used as a package for various foods and drinks such as seasonings, cosmetics such as liquid detergents, shampoos, rinses and conditioners, sanitary goods, daily necessities and chemical products. Specific examples of foods and drinks include coffee, coffee beans, coffee powder, ice cream, gummy, side dishes, pasta sauce, curry, jelly, bacon, chocolate, chocolate paste and the like. Specific examples of daily necessities include absorbent cotton, masks, bath salts, and powdered milk. Further, as illustrated in Examples described later, a packaging product provided with a packaging material 10 configured to have heat resistance is used for accommodating contents to be subjected to heat sterilization treatment such as retort treatment and boiling treatment. Can be used. The retort treatment is a treatment in which the contents are filled in the packaged product, the packaged product is sealed, and then the packaged product is heated in a pressurized state using steam or heated hot water. The temperature of the retort treatment is, for example, 120 ° C. or higher. The boil treatment is a treatment in which the contents are filled in the packaged product, the packaged product is sealed, and then the packaged product is boiled in hot water under atmospheric pressure. The temperature of the boiling treatment is, for example, 90 ° C. or higher and 100 ° C. or lower.

For the packaging bag of the packaging product, the packaging material 10 is folded in half, or two packaging materials 10 are prepared so that the sealant layer 40 of the packaging material 10 on the front side and the sealant layer 40 of the packaging material 10 on the back side face each other. The peripheral ends are overlapped, for example, side seal type, two-way seal type, three-way seal type, four-way seal type, envelope-pasted seal type, gassho-pasted seal type (pillow-seal type), fold-attached seal type, etc. Various types of packaging bags can be manufactured by heat-sealing with a heat-sealing form such as a flat-bottomed sealing type or a square-bottomed sealing type. Further, it is also possible to manufacture a gusset type packaging bag by performing heat sealing with the packaging material 10 in a folded state inserted between the packaging material 10 on the front side and the packaging material 10 on the back side. It should be noted that all of the packaging materials 10 constituting the packaging bag do not have to be the packaging materials 10 according to the present invention. That is, at least a part of the packaging material 10 constituting the packaging bag may be the packaging material 10 having an adhesive layer containing a biomass-derived component, and the other portion of the packaging material 10 constituting the packaging bag is derived from fossil fuel. It may be the packaging material 10 having the adhesive layer of.

As a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, or an ultrasonic seal can be used.

FIG. 5 is a diagram showing an example of a packaging bag 70 including the packaging material 10. The bag 70 includes a front surface film 74 constituting the front surface, a back surface film 75 constituting the back surface, and a lower film 76 constituting the lower portion 72. The lower film 76 is arranged between the front surface film 74 and the back surface film 75 in a state of being folded back by the folded-back portion 76f. As described above, the packaging bag 70 shown in FIG. 5 is a self-supporting standing pouch having a lower portion as a gusset portion.

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

The terms "front surface film", "back surface film", and "lower film" described above are merely those in which each film is partitioned according to the positional relationship, and the packaging material 10 for manufacturing the packaging bag 70 is provided. The method is not limited by the above terms. For example, the packaging bag 70 may be manufactured by using one packaging material 10 in which the front surface film 74, the back surface film 75, and the lower film 76 are connected in series, and the front surface film 74 and the lower film 76 are connected in series. It may be manufactured by using a total of two packaging materials 10 of one packaging material 10 and one back surface film 75, one front surface film 74, one back surface film 75, and one lower film 76. It may be manufactured using a total of three packaging materials 10.

At least one of the front surface film 74, the back surface film 75, and the lower film 76 is composed of a packaging material 10 having an adhesive layer containing biomass-derived components. As a result, the amount of fossil fuel used can be reduced as compared with the conventional case, and the environmental load can be reduced.

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

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

In the example shown in FIG. 6, the steam bleeding mechanism 80 is not separated from the accommodating portion 77 by the steam bleeding seal portion 81 protruding from the side seal portion 73a toward the inside of the packaging bag 70 and the steam bleeding seal portion 81. It has a seal portion 82 and. The unsealed portion 82 communicates with the outside of the packaging bag 70. When the pressure of the accommodating portion 77 is increased by being heated by a microwave oven or the like, the steam venting seal portion 81 is peeled off. The steam of the accommodating portion 77 can escape to the outside of the packaging bag 70 through the peeled portion of the steam vent sealing portion 81 and the unsealed portion 82.

The configuration of the steam venting mechanism 80 is not limited to the configuration shown in FIG. The configuration of the steam venting mechanism 80 is arbitrary as long as the accommodating portion 77 and the outside of the packaging bag 70 can communicate with each other when the steam pressure becomes a predetermined value or more.

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

FIG. 7 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 7 is different in that the spout portion 85 is further provided, and the other configurations are substantially the same as those of the packaging bag 70 shown in FIG. In the packaging bag 70 shown in FIG. 7, the same parts as those of the packaging bag 70 shown in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

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

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

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

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

FIG. 8 is a diagram showing another example of the packaging bag 70 including the packaging material 10. The packaging bag 70 shown in FIG. 8 is a four-way seal pouch formed by joining the front surface film 74 and the back surface film 75 along the outer edge on four sides. As in the case of the examples shown in FIGS. 5 to 7, an upper seal portion is formed on the upper portion 71 after the contents are stored in the packaging bag 70 via the opening 71b.

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

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

FIG. 9 is a diagram showing an example of a container with a lid 90 provided with a packaging material 10. The container 90 with a lid includes a container body 92 manufactured by sheet molding such as drawing molding, and a lid portion 94 joined to the container body 92.

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

Further, in the example shown in FIG. 9, the lid portion 94 may be formed of the packaging material 10 having an adhesive layer containing a biomass-derived component. As a result, the amount of fossil fuel used can be reduced as compared with the conventional case, and the environmental load can be reduced.

<Other aspects>
According to another aspect of the present invention, the packaging material includes at least a base material layer, a printing layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer and is adhered. A packaging material is provided in which the agent layer contains a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component.
In the packaging material according to another aspect of the present invention, the polyol in the adhesive layer may be a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol or the polyfunctional carboxylic acid in the adhesive layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the polyol in the adhesive layer may be a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol or the polyfunctional isocyanate of the adhesive layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the isocyanate compound in the adhesive layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the printing layer contains a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component. May be good.
In the packaging material according to another aspect of the present invention, the polyol in the printing layer may be a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol or the polyfunctional carboxylic acid in the printing layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the polyol in the printing layer may be a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate.
In the packaging material according to another aspect of the present invention, at least one of the polyfunctional alcohol or the polyfunctional isocyanate of the printing layer may contain a biomass-derived component.
In the packaging material according to another aspect of the present invention, the base material layer may have a base material film containing polyester, polyamide or polyolefin.
In the packaging material according to another aspect of the present invention, the base film may contain a biomass polyester having a biomass-derived ethylene glycol as a diol unit and a fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit.
In the packaging material according to another aspect of the present invention, the sealant layer may contain a polyolefin which is a polymer of a monomer containing an olefin.
In the packaging material according to another aspect of the present invention, the sealant layer may contain biomass polyolefin which is a polymer of a monomer containing ethylene derived from biomass.
According to another aspect of the present invention, a packaged product comprising the above-mentioned packaging material is provided.

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 following Examples as long as the gist of the present invention is not exceeded.

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12 / mark / bio contact / PE (1) 30
"/" Represents the boundary between layers. The leftmost layer is a layer constituting the outer surface of the packaging material 10, and the rightmost layer is a layer constituting the inner surface of the packaging material 10.
"PET" means a biaxially stretched PET film derived from fossil fuels.
"Mark" means a printed layer derived from fossil fuels.
"Bio-contact" means an adhesive layer derived from biomass.
"PE (1)" means the above-mentioned polyethylene film 1.
The numbers mean the thickness of the layer (unit: μm).

[Example 1B]
As in the case of Example 1A, the reaction product of the polyfunctional alcohol derived from fossil fuel and the polyfunctional isocyanate containing the biomass-derived component was used as the polyether polyol which is the main agent of the adhesive layer 30. The packaging material 10 was produced.

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12 / Bio stamp / Bio contact / PE (1) 30
"Biomark" means a print layer derived from biomass.

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

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

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

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

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

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

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

[Example 1J]
A packaging material 10 was produced in the same manner as in Example 1G, except that a biaxially stretched PET film (thickness 12 μm) containing a biomass-derived component was used as the base film 22.

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
Bio PET12 / Bio Mark / Bio Contact / PE (1) 30
"Bio PET" means a biomass-derived PET film.

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

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

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

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

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

The layer structure and the like of the packaging material 10 of Examples 1A to 1L are collectively shown in FIG. In the column of "type of adhesive layer" in FIG. 10, the description "ether-based" means that the main agent used in the adhesive layer is a polyether polyol.
Further, in the column of "biomass-derived components in the adhesive layer", the description "polyfunctional alcohol" means that at least the polyfunctional alcohol of the main agent among the components of the main agent and the curing agent used in the adhesive layer is derived from biomass. It means that there is. Similarly, the description "isocyanate compound" means that at least the isocyanate compound of the curing agent among the components of the main agent and the curing agent used in the adhesive layer is derived from biomass.

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
OPP20 / Mark / Bio-contact / PE (1) 25
"OPP" means a biaxially stretched polypropylene film derived from fossil fuels.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
Barrier OPP20 / Mark / Bio-contact / PE (1) 25
"Barrier OPP" means a polypropylene film in which a vapor-deposited layer of an inorganic oxide and a gas barrier coating film are provided on a biaxially stretched polypropylene film derived from fossil fuel.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12 / mark / bio contact / VMCPP20
"VMCPP" means a biaxially stretched polypropylene film derived from fossil fuels provided with a metal vapor deposition layer.

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET12 / mark / bio contact / CPP20

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

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

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

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

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
PET20 / mark / bio contact / CNY60
"CNY" means a nylon film derived from fossil fuels.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
IB-PET12 / Mark / Bio-contact / CPP25
"IB-PET" means a PET film provided with a thin-film deposition layer of an inorganic oxide and a gas barrier coating film located on the thin-film deposition layer.

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

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

In the packaging materials of Examples 2A to 9 described so far, the adhesive layer shown in Examples 1B to 1C may be used as the adhesive layer other than that used in Example 1A. Further, as the print layer, a variation similar to that in the case of Examples 1B to 1L can be adopted as the print layer other than that used in Example 1A.

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

The layer structure of the packaging material 10 of this embodiment is expressed as follows.
ONY15 / Mark / Bio contact / PE (1) 50
"ONY" means a biaxially stretched nylon film derived from fossil fuels.

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

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

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

Further, as the print layer, a variation similar to that in the case of Examples 1B to 1L can be adopted as the print layer other than that used in Example 1A.

FIG. 11 summarizes examples of the layer structure of the packaging material 10 of Examples 1A and 2A to 11 and the type of the packaging container.

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

Claims (12)

A packaging material including at least a base material layer, a printing layer, an adhesive layer, and a sealant layer, wherein the adhesive layer is in contact with the sealant layer.
The adhesive layer contains a cured product of a polyol and an isocyanate compound, and contains.
The polyol in the adhesive layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid.
The polyfunctional carboxylic acid in the adhesive layer is a packaging material composed of only biomass-derived components. The packaging material according to claim 1, wherein the isocyanate compound in the adhesive layer contains a biomass-derived component. The packaging material according to claim 1 or 2, wherein the printing layer contains a colorant and a cured product of a polyol and an isocyanate compound, and at least one of the polyol or the isocyanate compound contains a biomass-derived component. The packaging material according to claim 3, wherein the polyol in the printing layer is a polyester polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional carboxylic acid. The packaging material according to claim 4, wherein at least one of the polyfunctional alcohol or the polyfunctional carboxylic acid in the printing layer contains a biomass-derived component. The packaging material according to claim 3, wherein the polyol in the printing layer is a polyether polyol which is a reaction product of a polyfunctional alcohol and a polyfunctional isocyanate. The packaging material according to claim 6, wherein at least one of the polyfunctional alcohol or the polyfunctional isocyanate of the printing layer contains a biomass-derived component. The packaging material according to any one of claims 1 to 7, wherein the base material layer has a base material film containing polyester, polyamide or polyolefin. The packaging material according to claim 8, wherein the base film contains a biomass polyester having a biomass-derived ethylene glycol as a diol unit and a fossil fuel-derived dicarboxylic acid as a dicarboxylic acid unit. The packaging material according to any one of claims 1 to 9, wherein the sealant layer contains a polyolefin which is a polymer of a monomer containing an olefin. The packaging material according to claim 10, wherein the sealant layer contains biomass polyolefin, which is a polymer of a monomer containing ethylene derived from biomass. A packaged product comprising the packaging material according to any one of claims 1 to 11.

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