JP6743990B2 - Laminated body including polyolefin resin layer and packaged product including the same - Google Patents

Description

The present invention relates to a laminate provided with a polyolefin resin layer containing biomass polyolefin, and more specifically, a polyolefin resin layer containing at least a paper base layer and a biomass polyolefin that is a polymer of a monomer containing biomass-derived ethylene. And a laminated body including. Furthermore, it relates to a packaging product and a paper cup provided with the laminate.

In recent years, as the demand for building a recycling-based society has increased, in the materials field as well as energy, there is a desire to break away from fossil fuels, and the use of biomass is drawing attention. Biomass is an organic compound photosynthesized from carbon dioxide and water, and by utilizing it, it becomes carbon dioxide and water again, so-called carbon-neutral renewable energy. In recent years, the practical use of biomass plastics using these biomasses as raw materials has progressed rapidly, and attempts have been made to produce various resins from biomass raw materials.

As a biomass-derived resin, polylactic acid (PLA), which is produced through lactic acid fermentation, preceded commercial production, but its performance as a plastic, including its biodegradability, is the current general-purpose plastic. Therefore, it is not widely used because there are limitations in product applications and product manufacturing methods. Further, life cycle assessment (LCA) evaluation is performed on PLA, and energy consumption during PLA production and equivalence during replacement of general-purpose plastics are discussed.

Here, as the general-purpose plastic, various types such as polyethylene, polypropylene, polyvinyl chloride, and polystyrene are used. In particular, polyethylene is molded into films, sheets, bottles, etc., and is used for various applications such as packaging materials, and is used in large amounts all over the world. Therefore, using conventional fossil fuel-derived polyethylene has a large environmental load.

Therefore, it is desired to reduce the amount of fossil fuel used by using a raw material derived from biomass for the production of polyethylene. For example, to date, research has been conducted on producing ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see, for example, Patent Document 1).

Japanese Patent Publication No. 2011-506628

The present inventors have focused on ethylene, which is a raw material for polyolefin resins, and instead of ethylene obtained from conventional fossil fuels, biomass-derived ethylene that uses ethylene as a raw material (hereinafter, simply referred to as “biomass polyolefin”). And a polyolefin resin layer containing a polyolefin resin layer containing a polyolefin resin layer including a polyolefin resin (hereinafter, simply referred to as “fossil fuel-derived polyolefin”) produced by using ethylene obtained from conventional fossil fuels. It was found that a laminate having the above can be obtained that is comparable in physical properties such as mechanical properties. The present invention is based on this finding.

Accordingly, an object of the present invention is to provide a laminate having a polyolefin resin layer containing a biomass polyolefin, which is comparable to a laminate having a polyolefin resin layer made of a conventional fossil fuel-derived polyolefin in physical properties such as mechanical properties. That is.

In an aspect of the invention,
At least a thermoplastic resin layer, a paper base layer, a laminate for a paper cup comprising a polyolefin resin layer in this order,
The polyolefin resin layer contains low-density polyethylene derived from biomass, which is a polymer of monomers containing ethylene derived from biomass,
The degree of biomass in the polyolefin resin layer is 5% or more,
The thermoplastic resin layer is low density polyethylene,
The innermost layer of the laminate for the paper cup is the polyolefin resin layer,
Provided is a laminate for paper cups, wherein the outermost layer of the laminate for paper cups is the thermoplastic resin layer.
In the aspect of the present invention, it is preferable that the low-density polyethylene of the thermoplastic resin layer is a fossil fuel-derived low-density polyethylene.
In the aspect of the present invention, it is preferable that the laminate for a paper cup further has a barrier layer.
In the aspect of the present invention, it is preferable that the paper cup laminate further has a printing layer.
In another aspect of the present invention, there is provided a paper cup including the laminate for a paper cup.

The laminate according to the present invention includes at least a paper base layer and a polyolefin resin layer containing biomass polyolefin, so that the amount of fossil fuel used can be reduced as compared with the conventional one, and the environmental load can be reduced. it can. Further, the laminate according to the present invention is comparable to the conventional fossil fuel-derived polyolefin resin laminate in terms of physical properties such as mechanical properties, so that it replaces the conventional fossil fuel-derived polyolefin resin laminate. be able to.

It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. It is a schematic cross section which shows an example of the laminated body by this invention. The perspective view which cut off a part of paper cup. The front view which fractured|ruptured a part which shows another embodiment of a paper cup.

In the present invention, the "biomass polyolefin" and "polyolefin resin layer containing biomass polyolefin" are those in which a biomass-derived raw material is used at least in part as a raw material, and all of the raw materials are derived from biomass. Does not mean.

<Laminate>
The laminate according to the present invention comprises a paper base layer and a polyolefin resin layer containing biomass polyolefin. The polyolefin resin layer is the innermost layer when a packaging container is formed using the laminate. By providing the polyolefin resin layer containing the biomass polyolefin, the laminated body can reduce the amount of fossil fuel used as compared with the conventional one and can reduce the environmental load. Further, since the laminate according to the present invention is comparable to the laminate of the polyolefin resin produced from the raw material obtained from the conventional fossil fuel in terms of physical properties such as mechanical properties, the laminate of the conventional polyolefin resin. Can be replaced.

In addition to the above layers, the laminate according to the present invention may further have at least one layer such as a thermoplastic resin layer, a printing layer, a barrier layer, a plastic film and an adhesive layer. When two or more other layers are provided, they may have the same composition or different compositions.

The laminate according to the present invention will be described with reference to the drawings. Examples of schematic cross-sectional views of the laminate according to the present invention are shown in FIGS.
The laminated body 10 shown in FIG. 1 includes a paper base material layer 11 and a polyolefin resin layer 12 formed on the paper base material layer 11. In the case of a paper cup including the laminate 10, the polyolefin resin layer 12 is located inside the paper cup. Here, the polyolefin resin layer 12 is a polyolefin resin layer containing biomass polyolefin.
The laminate 20 shown in FIG. 2 comprises a paper base layer 11, an adhesive layer 13, a barrier layer 14, and a polyolefin resin layer 12 in this order on one surface of the paper base layer 11. is there. In the case of a paper cup including the laminate 20, the polyolefin resin layer 12 is located inside the paper cup.
The laminated body 30 shown in FIG. 3 includes the paper base layer 11, the adhesive layer 13, the plastic film 15, the adhesive layer 13, and the polyolefin resin layer 12 on one surface of the paper base layer 11. Prepare in order. In the case of a paper cup including the laminate 30, the polyolefin resin layer 12 is located inside the paper cup.
In any of the laminates, the printing layer or the thermoplastic resin layer may be laminated on the other surface of the paper base material layer 11. When the printed layer and the thermoplastic resin layer are laminated, they may be laminated so that the thermoplastic resin layer is the outermost surface.
Hereinafter, each layer constituting the laminated body will be described.

(Paper substrate layer)
In the present invention, the paper base material layer functions as a base material layer that holds the polyolefin resin layer, and it is preferable that the paper base material layer can impart strength to the laminate as a packaging product. The paper used as the paper base layer has a basis weight of 100 g/m ² or more and 700 g/m ² or less, preferably 150 g/m ² or more and 600 g/m ² or less, and more preferably 200 g/m ² or more and 500 g/m ² or less. I have. As the paper base layer, white paperboard in general is targeted, but ivory paper using natural pulp, milk carton base paper, cup base paper and the like are particularly preferably used from the viewpoint of safety.

Further, the paperboard used in the present invention may use neutral rosin, alkyl ketene dimer, alkenyl succinic anhydride as a sizing agent, and use cationic polyacrylamide or cationic starch as a fixing agent. Good. It is also possible to use a sulfuric acid band to make paper in the neutral region of pH 6 or higher and pH 9 or lower. In addition to the above sizing agents, various fixing agents, paper making fillers, retention aids, dry paper strength enhancers, wet paper strength enhancers, binders, dispersants, flocculants, plasticizers, if necessary. Agents and adhesives may be appropriately contained.

(Polyolefin resin layer)
In the present invention, the polyolefin resin layer contains biomass polyolefin, which is a polymer of a monomer containing biomass-derived ethylene, and may further contain fossil fuel-derived polyolefin. The polyolefin resin layer may contain 5% by mass or more and 100% by mass or less of the biomass polyolefin and 0% by mass or more and 95% by mass or less of the fossil fuel-derived polyolefin with respect to the entire polyolefin resin layer. It may include less than mass% biomass polyolefin and more than 0 mass% and less than 95 mass% fossil fuel-derived polyolefin, and 25 mass% or more and 75 mass% or less biomass polyolefin and 25 mass% or more and 75 mass% or less. The following fossil fuel-derived polyolefin may be included. It is sufficient that the polyolefin resin layer as a whole can achieve the following biomass degree. In the present invention, since the polyolefin resin layer contains the biomass polyolefin, the amount of the fossil fuel-derived polyolefin can be reduced and the environmental load can be reduced as compared with the conventional case.

In the present invention, the “biomass degree” in the polyolefin resin layer (carbon concentration derived from biomass in biomass polyolefin) is a value obtained by measuring the content of biomass-derived carbon by measuring radioactive carbon (C14). Since carbon dioxide in the atmosphere contains C14 at a constant ratio (105.5 pMC), the amount of C14 contained in plants growing by taking in carbon dioxide in the atmosphere, for example, corn, is also about 105.5 pMC. It is known. It is also known that fossil fuel contains almost no C14. Therefore, the proportion of carbon derived from biomass can be calculated by measuring the proportion of C14 contained in all carbon atoms in the polyolefin. In the present invention, when the content of C14 in the polyolefin is P _C14 , the content P _bio of carbon derived from biomass can be obtained as follows.
P _bio (%)=P _C14 /105.5×100

In the present invention, theoretically, if all biomass-derived ethylene is used as the raw material of the polyolefin, the biomass degree is 100%, and the biomass-derived polyolefin has a biomass degree of 100%. Further, the carbon concentration derived from the biomass in the fossil fuel-derived polyolefin produced only from the fossil fuel-derived raw material is 0%, and the biomass degree of the fossil fuel-derived polyolefin is 0%.

In the present invention, the degree of biomass in the polyolefin resin layer is 5% or more, preferably 10% or more, more preferably 15% or more, and further preferably 20% or more. The degree of biomass in the polyolefin resin layer does not need to be 100%. This is because if the biomass-derived raw material is used even in a part of the laminated body, it is in line with the gist of the present invention that the amount of fossil fuel used is reduced as compared with the conventional case. When the degree of biomass in the polyolefin resin layer is 5% or more, the amount of fossil fuel-derived polyolefin can be reduced and the environmental load can be reduced as compared with the conventional case.

Polyolefin resin layer is preferably from 0.91 g / cm ³ or more 0.93 g / cm ³ or less, more preferably 0.911 g / cm ³ or more 0.928 g / cm ³ or less, more preferably 0.915 g / cm ³ or more It has a density of 0.925 g/cm ³ or less. The density of the polyolefin resin layer is a value measured according to the method specified in the method A of JIS K7112-1980 after performing the annealing described in JIS K6760-1995. If the density of the polyolefin resin layer is 0.91 g / cm ³ or more 0.93 g / cm ³ or less, it is possible to facilitate processing and molding.

The polyolefin resin layer has a thickness of 5 μm or more and 100 μm or less, preferably 10 μm or more and 60 μm or less, more preferably 15 μm or more and 40 μm or less. When the thickness of the polyolefin resin layer is within the above range, the function as the sealing layer of the packaging container can be sufficiently fulfilled.

(Biomass polyolefin)
In the present invention, the biomass polyolefin is a polymer of a monomer containing ethylene derived from biomass. As the biomass-derived ethylene, it is preferable to use one obtained by the production method described below. Since biomass-derived ethylene is used as a 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 biomass-derived ethylene.

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

The above-mentioned α-olefin is not particularly limited in carbon number, but normally, one having 3 to 20 carbon atoms can be used, and butylene, hexene, or octene is preferable. This is because if butylene, hexene, or octene can be produced by polymerizing ethylene, which is a raw material derived from biomass. Further, by including such an α-olefin, the polymerized biomass polyolefin has an alkyl group as a branched structure, and thus can be 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 in combination of two or more. Particularly, the biomass polyolefin is preferably polyethylene. This is because it is theoretically possible to produce 100% biomass-derived components by using ethylene, which is a biomass-derived raw material.

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

Biomass polyolefin, preferably 0.91 g / cm ³ or more 0.93 g / cm ³ or less, more preferably 0.912 g / cm ³ or more 0.928 g / cm ³ or less, more preferably 0.915 g / cm ³ or more 0 It has a density of 0.925 g/cm ³ or less.
The density of the biomass polyolefin is a value measured according to the method defined in the method A of JIS K7112-1980 after performing the annealing described in JIS K6760-1995. 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 packaging 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 increased, and the biomass polyolefin can be suitably used as the inner layer of the packaging 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 method A under the conditions of a temperature of 190° C. and a load of 21.18 N according to the method defined in JIS K7210-1995. When the MFR of the biomass polyolefin is 0.1 g/10 minutes or more, the extrusion load during molding can be reduced. If the MFR of the biomass polyolefin is 10 g/10 minutes or less, the mechanical strength of the polyolefin resin layer containing the biomass polyolefin can be increased.

In the present invention, preferably used as the biomass polyolefin is a biomass-derived low-density polyethylene (trade name: SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 minutes, biomass degree manufactured by Braskem Co., Ltd. 95%), low density polyethylene (trade name: SPB681, density: 0.922 g/cm ³ , MFR: 3.8 g/10 minutes, biomass degree 95%) manufactured by Braskem Co., and the like.

(Method for producing ethylene derived from biomass)
In the present invention, the method for producing biomass-derived ethylene, which is a raw material for biomass polyolefin, is not particularly limited, and can be obtained by a conventionally known method. Hereinafter, an example of a method for producing ethylene derived from biomass will be described.

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

In the present invention, the biomass-derived fermented ethanol refers to ethanol purified after the ethanol-producing microorganism or its crushed product-derived product is brought into contact with a culture solution containing a carbon source obtained from a plant raw material. For the purification of ethanol from the culture solution, conventionally known methods such as distillation, membrane separation, and extraction can be applied. For example, a method of adding benzene, cyclohexane or the like to cause azeotropic distillation, or removing water by membrane separation or the like can be mentioned.

In order to obtain the ethylene of the present invention, at this stage, advanced purification such as making the total amount of impurities in ethanol 1 ppm or less may be further performed.

A catalyst is usually used when ethylene is obtained by the dehydration reaction of ethanol, but the catalyst is not particularly limited, and a conventionally known catalyst can be used. What is advantageous in the process is a fixed bed flow reaction in which the catalyst and the product can be easily separated, and for example, γ-alumina and the like are preferable.

Since this dehydration reaction is an endothermic reaction, it is usually performed under heating conditions. The heating temperature is not limited as long as the reaction proceeds at a commercially useful reaction rate, but a temperature of 100°C or higher, preferably 250°C or higher, more preferably 300°C or higher is suitable. The upper limit is also not particularly limited, but from the viewpoint of energy balance and equipment, it is preferably 500°C or lower, more preferably 400°C or lower.

The reaction pressure is also not particularly limited, but a pressure equal to or higher than normal pressure is preferable in order to facilitate the subsequent gas-liquid separation. Industrially, a fixed bed flow reaction in which the catalyst can be easily separated is preferable, but a liquid phase suspension bed, a fluidized bed or the like may be used.

In the dehydration reaction of ethanol, the yield of the reaction depends on the amount of water contained in ethanol supplied as a raw material. In general, when performing a dehydration reaction, it is preferable that there is no water in view of the removal efficiency of water. However, in the case of ethanol dehydration reaction using a solid catalyst, it was found that the amount of other olefins, especially butene, tends to increase in the absence of water. It is speculated that ethylene dimerization after dehydration cannot be suppressed unless a small amount of water is present. The lower limit of the permissible water content is 0.1% or more, preferably 0.5% or more. The upper limit is not particularly limited, but from the viewpoint of mass balance and heat balance, it is preferably 50% by mass or less, more preferably 30% or less, still more preferably 20% or less.

By carrying out the dehydration reaction of ethanol in this way, a mixed part of ethylene, water and a small amount of unreacted ethanol can be obtained. However, at room temperature, ethylene is a gas at a pressure of about 5 MPa or less. Ethylene can be obtained by removing water and ethanol. This method may be performed by a known method.

Ethylene obtained by gas-liquid separation is further distilled, and the distillation method, operating temperature, residence time and the like are not particularly limited, except that the operating pressure at this time is atmospheric pressure or higher.

When the raw material is ethanol derived from biomass, the obtained ethylene has carbon dioxide gas that is a carbonyl compound such as ketones, aldehydes, and esters that are impurities mixed in the ethanol fermentation process and carbon dioxide that is its decomposition product, and a decomposition product of the enzyme. A trace amount of impurities such as nitrogen-containing compounds such as amines and amino acids and decomposition products thereof such as ammonia are contained. These trace amounts of impurities may pose a problem depending on the use of ethylene, and may be removed by purification. The purification method is not particularly limited and can be performed by a conventionally known method. As a suitable purification operation, for example, an adsorption purification method can be mentioned. The adsorbent used is not particularly limited, and a conventionally known adsorbent can be used. For example, a material having a high surface area is preferable, and the type of the adsorbent is selected according to the type and amount of impurities in ethylene obtained by the dehydration reaction of ethanol derived from biomass.

Incidentally, caustic water treatment may be used in combination as a method for purifying impurities in ethylene. When treating with caustic water, it is desirable to perform it before adsorption purification. In that case, it is necessary to perform a water removal treatment after the caustic treatment and before the adsorption purification.

(Method for producing biomass polyolefin)
In the present invention, the method for polymerizing the monomer containing biomass-derived ethylene is not particularly limited, and a conventionally known method can be used. The polymerization temperature and the polymerization pressure may be appropriately adjusted depending on the polymerization method and the polymerization apparatus. The polymerization device is also not particularly limited, and a conventionally known device can be used. Hereinafter, an example of a method for polymerizing a monomer containing ethylene will be described.

The method of polymerizing a polyolefin, particularly an ethylene polymer or a copolymer of ethylene and an α-olefin, is based on the type of the desired polyethylene, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE). ), and linear low-density polyethylene (LLDPE), etc., can be appropriately selected depending on the difference in density and branching.
For example, as a polymerization catalyst, using a multi-site catalyst such as Ziegler-Natta catalyst or a single-site catalyst such as a metallocene catalyst, by any of gas phase polymerization, slurry polymerization, solution polymerization, and high pressure ionic polymerization, It is preferable to carry out in one step or in multiple steps of two or more steps.

The above single-site catalyst is a catalyst that can form a uniform active species, and is usually prepared by contacting a metallocene-based transition metal compound or a nonmetallocene-based transition metal compound with an activating cocatalyst. .. The single-site catalyst is preferable since it has a more active site structure than the multi-site catalyst and can polymerize a polymer having a high molecular weight and a high degree of uniformity. As the single-site catalyst, it is particularly preferable to use a metallocene catalyst. The metallocene catalyst is a catalyst containing a transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, a cocatalyst, an organometallic compound if necessary, and each catalyst component of a carrier. is there.

In the transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, the cyclopentadienyl skeleton is a cyclopentadienyl group, a substituted cyclopentadienyl group or the like. .. The substituted cyclopentadienyl group includes a hydrocarbon group having 1 to 30 carbon atoms, a silyl group, a silyl-substituted alkyl group, a silyl-substituted aryl group, a cyano group, a cyanoalkyl group, a cyanoaryl group, a halogen group, a haloalkyl group, and a halosilyl group. It has at least one kind of substituent selected from groups and the like. The substituted cyclopentadienyl group may have two or more substituents, and the substituents are bonded to each other to form a ring, and an indenyl ring, a fluorenyl ring, an azulenyl ring, a hydrogenated product thereof or the like can be formed. You may form. The ring formed by bonding the substituents to each other may further have a substituent.

In the transition metal compound of Group IV of the periodic table containing a ligand having a cyclopentadienyl skeleton, examples of the transition metal include zirconium, titanium and hafnium, and zirconium and hafnium are particularly preferable. The transition metal compound usually has two as a ligand having a cyclopentadienyl skeleton, and it is preferable that each ligand having a cyclopentadienyl skeleton is bound to each other by a bridging group. Examples of the bridging group include a substituted silylene group such as an alkylene group having 1 to 4 carbon atoms, a silylene group, a dialkylsilylene group, and a diarylsilylene group, and a substituted germylene group such as a dialkylgermylene group and a diarylgermylene group. A substituted silylene group is preferred.

In the transition metal compound of Group IV of the periodic table, as a ligand other than the ligand having a cyclopentadienyl skeleton, hydrogen and a hydrocarbon group having 1 to 20 carbon atoms (alkyl group) are typical. , Alkenyl groups, aryl groups, alkylaryl groups, aralkyl groups, polyenyl groups, etc.), halogens, metaalkyl groups, metaaryl groups and the like.

The transition metal compound of Group IV of the periodic table containing the above-mentioned ligand having a cyclopentadienyl skeleton can use one kind or a mixture of two or more kinds as a catalyst component.

The co-catalyst is a co-catalyst that can effectively use the above-mentioned transition metal compound of Group IV of the periodic table as a polymerization catalyst or can balance the ionic charge in a catalytically activated state. As the co-catalyst, a benzene-soluble aluminoxane of an organoaluminum oxy compound, a benzene-insoluble organoaluminum oxy compound, an ion-exchange layered silicate, a boron compound, a cation with or without an active hydrogen group and a non-coordinating anion are used. And lanthanoid salts such as lanthanum oxide, tin oxide, phenoxy compounds containing a fluoro group, and the like.

The group IV transition metal compound of the periodic table containing a ligand having a cyclopentadienyl skeleton may be used by supporting it on an inorganic or organic compound carrier. As the carrier, a porous oxide of an inorganic or organic compound is preferable, and specifically, an ion-exchange layered silicate such as montmorillonite, SiO ₂ , Al ₂ O ₃ , MgO, ZrO ₂ , TiO ₂ , B ₂ O. ₃ , CaO, ZnO, BaO, ThO _{2 and the} like, or a mixture thereof.

Further, examples of the organometallic compound used as necessary include organoaluminum compounds, organomagnesium compounds, organozinc compounds and the like. Of these, organic aluminum is preferably used.

Various additives may be added to the biomass polyolefin in addition to the polyolefin as the main component, as long as the characteristics are not impaired. Examples of the additives include plasticizers, ultraviolet stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weather resistance agents, antistatic agents, thread friction reducing agents, slip agents, release agents, and An oxidizing agent, an ion exchange agent, a coloring pigment, etc. can be added. These additives are preferably added in the range of 1% by mass or more and 20% by mass or less, preferably 1% by mass or more and 10% by mass or less, based on the entire biomass polyolefin.

(Thermoplastic resin layer)
The thermoplastic resin layer can be formed using a conventionally known thermoplastic resin. By providing the laminate with a thermoplastic resin layer, heat resistance, pressure resistance, water resistance, heat sealability, pinhole resistance, puncture resistance, and other physical properties similar to those of conventional laminates can be imparted. be able to.

Examples of the thermoplastic resin include low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer. Polymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ionomer resin, polyester resin, polyvinyl chloride resin, polystyrene resin, nylon, etc. Among them, low density polyethylene, linear low density polyethylene, medium density polyethylene, and ethylene-methacrylic acid copolymer are preferable.

The thermoplastic resin layer may include a biomass-derived material or a fossil fuel-derived material. When the thermoplastic resin layer contains a biomass-derived material, it may contain biomass polyolefin, which is a polymer of a biomass-derived ethylene-containing monomer, like the polyolefin resin layer.

(Print layer)
The print layer is used to display characters, numbers, pictures, patterns, symbols, patterns, etc. It is a layer that forms a desired print pattern. The printing layer can be provided as needed, and can be provided, for example, on the surface of the paper base material layer opposite to the polyolefin resin layer. The print layer may be provided on the entire surface of the paper base material layer or may be provided on a part thereof. The printed layer can be formed using a conventionally known pigment or dye, and the forming method is not particularly limited.

(Barrier layer)
The barrier layer is made of an inorganic material and/or an inorganic oxide, and is preferably made of a vapor deposited film of an inorganic material or an inorganic oxide or a metal foil. The vapor deposition film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and its composition and forming method are not particularly limited. When the laminated body further includes the barrier layer, it is possible to impart or improve the gas barrier property of blocking transmission of oxygen gas, water vapor and the like and the light blocking property of blocking transmission of visible light and ultraviolet ray. The laminate may have two or more barrier layers. When two or more barrier layers are provided, they may have the same composition or different compositions.

As the vapor deposition film, for example, silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti). ), lead (Pb), zirconium (Zr), yttrium (Y), and other inorganic substances or inorganic oxide vapor deposition films can be used. In particular, as a material suitable for a packaging material (bag) or the like, a vapor deposition film of aluminum metal, or a vapor deposition film of silicon oxide or aluminum metal or aluminum oxide is preferably used.

Representation of the inorganic oxide, for _example, SiO X, as such AlO _X MO _X (In the formula, M represents an inorganic element, the value of X, varies each of an inorganic element range.) In 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 0-1 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 and 5, titanium (Ti). Is 0 to 2, lead (Pb) is 0 to 1, zirconium (Zr) is 0 to 2, and yttrium (Y) is 0 to 1.5. In the above, when X=0, the substance is a perfect 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 for the packaging material, and silicon (Si) is in the range of 1.0 to 2.0 and aluminum (Al) is in the range of 0.5 to 1.5. The value of can be used.

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

The vapor deposition film can be formed on a plastic film such as polyethylene terephthalate or nylon by the following forming method. Examples of the method for forming a vapor deposition film include a physical vapor deposition method (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, a thermochemical method. Examples thereof include chemical vapor deposition methods (Chemical Vapor Deposition method, CVD method) such as vapor phase growth method and photochemical vapor deposition method.

According to another aspect, the barrier layer may be a metal foil obtained by rolling a metal. A conventionally known metal foil can be used as the metal foil. Aluminum foil is preferable from the viewpoint of gas barrier properties that prevent transmission of oxygen gas and water vapor and the like, and light blocking properties that prevent transmission of visible light and ultraviolet light.

(Plastic film)
In the present invention, various plastic films may be used as the other layer. For example, any one of a stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, a nylon 6/meta xylylene diamine nylon 6 co-pushed co-stretched film or a polypropylene/ethylene-vinyl alcohol copolymer co-pushed co-stretched film, or It may be a composite film in which two or more of these films are laminated. The plastic film may be coated with polyvinyl alcohol or the like.

(Adhesive layer)
The adhesive layer can be an adhesive layer formed by applying an adhesive to the surface of a layer to be laminated and drying the layer when the two layers are adhered by a dry laminating method.
As the adhesive, for example, one-component or two-component curing or non-curing vinyl type, (meth)acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, etc. An adhesive such as a solvent type, an aqueous type, or an emulsion type can be used. As a method for coating the above-mentioned adhesive for lamination, for example, a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a Fonten method, a transfer roll coating method, or any other method is used to form a laminate. It can be applied to the coated side of the layer. The coating amount is preferably 0.1 g/m ² or more and 10 g/m ² or less (dry state), and more preferably 1 g/m ² or more and 5 g/m ² or less (dry state).

Further, the adhesive layer is an anchor formed by applying an anchor coating agent on the surface of the layer to be laminated and drying it when laminating a polyolefin resin layer or a thermoplastic resin layer by a melt extrusion laminating method. It may be a coat layer. As the anchor coating agent, an anchor coating agent made of any resin having a heat resistant temperature of 135° C. or higher, for example, a vinyl-modified resin, an epoxy resin, a urethane resin, a polyester resin or the like can be mentioned. An anchor coating agent comprising a polyacrylic or polymethacrylic resin having a hydroxyl group and an isocyanate compound as a curing agent can be preferably used. In addition, a silane coupling agent as an additive may be used in combination therewith, or nitrification cotton may be used in combination for increasing heat resistance.

Further, the adhesive layer may be an adhesive resin layer used when two layers are bonded by a sand laminating method or a melt extrusion laminating method. The thermoplastic resin that can be used for the adhesive resin layer includes a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin, or a copolymer resin containing these resins as a main component, a modified resin, or a mixture (including an alloy). ) Can be used. Examples of the polyolefin resin include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), polypropylene (PP), metallocene catalyst. Ethylene-α-olefin copolymer, ethylene-polypropylene random or block copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene Ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, ionomer resin, and adhesion between layers In order to improve the above, the above-mentioned polyolefin resin, acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, it is possible to use an acid-modified polyolefin resin modified with an unsaturated carboxylic acid such as itaconic acid. it can. In addition, a resin obtained by graft-polymerizing or copolymerizing an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer with a polyolefin resin can be used. These materials can be used alone or in combination of two or more. As the cyclic polyolefin-based resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbornene can be used. These resins can be used alone or in combination of two or more. Needless to say, the above-mentioned polyethylene-based resin may be the one using the above-mentioned biomass-derived ethylene as a monomer unit.

The adhesive resin layer may include a biomass-derived material or a fossil fuel-derived material. When the adhesive resin layer contains a biomass-derived material, the adhesive resin layer may contain biomass polyolefin, which is a polymer of a biomass-derived ethylene-containing monomer, like the polyolefin resin layer.

(Method for manufacturing laminated body)
The method for producing the laminate according to the present invention is not particularly limited, and it can be produced by a conventionally known method such as a dry laminating method, a melt extrusion laminating method, and a sand laminating method. In the present invention, it is preferable to form the polyolefin resin layer on the surface of the layer to be laminated by using the melt extrusion laminating method. Further, the polyolefin resin layer and another layer may be laminated by a coextrusion method.

For example, a resin composition for forming a polyolefin resin layer is supplied to a melt extruder heated to a temperature of melting point Tm or higher to a temperature of Tm+70° C. of a resin composition for forming a polyolefin resin layer by the following method. A polyolefin resin layer is laminated by melting a material and extruding it into a sheet shape from a die such as a T die on the surface of a layer to be laminated, and rapidly extruding and solidifying the extruded sheet material with a rotating cooling drum or the like. can do. As the melt extruder, a single-screw extruder, a twin-screw extruder, a vent extruder, a tandem extruder or the like can be used according to the purpose.

The thickness of the laminate obtained as described above is arbitrary depending on the application, but is usually 5 μm or more and 500 μm or less, preferably 20 μm or more and 300 μm or less.

The laminate according to the present invention 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. For the purpose, it is also possible to perform secondary processing. Examples of secondary processing include embossing, painting, adhesion, printing, metalizing (plating, etc.), machining, surface treatment (antistatic treatment, corona discharge treatment, plasma treatment, photochromism treatment, physical vapor deposition, chemical vapor deposition, Coating, etc.) and the like. Further, the laminate according to the present invention may be subjected to laminating processing (dry laminating or extrusion laminating), bag-making processing, and other post-treatment processing to produce a molded product.

(Use)
The laminate according to the present invention can be used for packaging products such as paper cups, liquid paper containers, label materials and lid materials.

(Paper cup)
The laminate according to the present invention can be suitably used especially for paper cups. A case where a paper cup is formed using the laminate according to the present invention will be described. FIG. 4 is a perspective view in which a part of the paper cup is cut away. As shown in FIG. 4, the paper cup 40 has a cylindrical body portion 42 having a flange portion 41 on the upper portion and a diameter gradually increasing toward the opening portion, and is provided at the lower end (one end) of the body portion 42. And a bottom portion 43. The body portion 42 is provided with a flange portion 41 whose upper end is rounded outward. In addition, the paper cup 40 may be hermetically sealed by accommodating a lid member (not shown) along the flange portion 41 of the body portion 42 after storing the contents. The lid material preferably has a gas barrier property.

Further, as shown in FIG. 5, the paper cup 40 may include an exterior body 44 on the outer periphery of the body 42. As the exterior body 44, for example, paper can be used. A convex portion 45 is formed on the body portion 42. The convex portion 45 is formed to provide a gap 46 of an air layer between the body portion 42 and the exterior body 44. One or more convex portions 45 are provided in the horizontal direction, and for example, two convex portions 45 can be provided as shown in FIG.

(Another mode)
Another object of the present invention is to provide a laminate having a polyolefin resin layer containing a biomass polyolefin, which is comparable to a laminate having a polyolefin resin layer made of a conventional fossil fuel-derived polyolefin in physical properties such as mechanical properties. That is.
In another aspect of the invention,
At least, a laminate comprising a paper base layer and a polyolefin resin layer,
The polyolefin resin layer contains biomass polyolefin, which is a polymer of a monomer containing biomass-derived ethylene,
The degree of biomass in the polyolefin resin layer is 5% or more,
The biomass polyolefin has a density of 0.91 g / cm ³ or more 0.93 g / cm ³ or less, laminate is provided.
In the aspect of the present invention, it is preferable that the polyolefin resin layer further contains a fossil fuel-derived polyolefin.
In the aspect of the present invention, it is preferable that the polyolefin resin layer contains 5% by mass or more and 100% by mass or less of the biomass polyolefin, and 0% by mass or more and 95% by mass or less of the fossil fuel-derived polyolefin.
In the aspect of the present invention, it is preferable that the polyolefin resin layer contains polyethylene.
In another aspect of the present invention, a packaged product including the laminate is provided.
In another aspect of the present invention, a paper cup provided with the above laminate,
A paper cup is provided, wherein the innermost layer of the paper cup is the polyolefin resin layer.
A laminate according to another aspect of the present invention includes at least a paper base layer and a polyolefin resin layer containing a biomass polyolefin, so that the amount of fossil fuel used can be reduced as compared with the conventional one, and the environmental load can be reduced. Can be reduced. Further, the laminate according to another aspect of the present invention is comparable to the conventional fossil fuel-derived polyolefin resin laminate in terms of physical properties such as mechanical properties, so that a conventional fossil fuel-derived polyolefin resin laminate is obtained. It can replace the body.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

<Measurements/conditions>
In the following Reference Example, Reference Comparative Example, Example, and Comparative Example, the biomass degree is a value of the carbon concentration derived from biomass by measuring radioactive carbon (C14).

The conditions of the extrusion film-forming machine used below were as follows.
Screw diameter: 90 mm
Screw type: Full flight L/D: 28
T-die: 11S type straight manifold T-die effective opening length: 560mm

[Example 1]
<Production of Laminate 1>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the biomass-derived low-density polyethylene ( Braskem Co., SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%) is melt extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min to obtain a polyolefin. A resin layer (biomass degree: 95%, thickness 40 μm) was formed to obtain a laminate 1 in which a paper base material layer and a polyolefin resin layer were sequentially laminated.

[Example 2]
<Production of laminated body 2>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface was provided with biomass-derived low-density polyethylene. (Braskem, SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%) 70 parts by mass and fossil fuel-derived low density polyethylene (Nippon Polyethylene, LC520, A mixed resin obtained by dry blending 30 parts by mass of density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) is melt extruded at a resin temperature of 320° C. and a line speed of 100 m/min. By laminating, a polyolefin resin layer (degree of biomass: 67%, thickness 40 μm) was formed to obtain a laminate 2 in which a paper base material layer and a polyolefin resin layer were laminated in this order.

[Comparative Example 1]
<Production of Laminate 3>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the fossil fuel-derived low density polyethylene was applied to the corona-treated surface. (Manufactured by Nippon Polyethylene Co., LC520, density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) is melt-extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min. Then, a resin layer (degree of biomass: 0%, thickness 40 μm) was formed to obtain a laminate 3 in which the paper base material layer and the resin layer were laminated in this order.

[Example 3]
<Production of Laminate 4>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the fossil fuel-derived low density polyethylene was applied to the corona-treated surface. (Manufactured by Nippon Polyethylene Co., LC520, density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) is melt-extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min. , A thermoplastic resin layer (degree of biomass: 0%, thickness 20 μm) was formed. Next, after corona-treating the surface of the paper base material layer opposite to the thermoplastic resin layer, low-density polyethylene derived from biomass (manufactured by Braskem, SBC818, density: 0.918 g/cm 3) was applied to the corona-treated surface. ³ , MFR: 8.1 g/10 min, biomass degree: 95%) 70 parts by mass and fossil fuel-derived low-density polyethylene (manufactured by Nippon Polyethylene Corporation, LC520, density: 0.923 g/cm ³ , MFR: 3.6 g) /10 minutes, biomass degree: 0%) 30 parts by mass of dry blended mixed resin is melt extruded at a resin temperature of 320° C. and a line speed of 100 m/min and laminated to obtain a polyolefin resin layer (biomass degree: 67%, thickness). 40 μm) was formed to obtain a laminated body 4 in which a thermoplastic resin layer, a paper base material layer, and a polyolefin resin layer were laminated in this order.

[Example 4]
<Production of laminated body 5>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight: 270 g/m2) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface had a biomass-derived low density polyethylene (Braskem). Manufactured by SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%), melt-extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min to obtain thermoplasticity. A resin layer (degree of biomass: 95%, thickness 20 μm) was formed. Next, after corona-treating the surface of the paper base material layer opposite to the thermoplastic resin layer, low-density polyethylene derived from biomass (manufactured by Braskem, SBC818, density: 0.918 g/cm 3) was applied to the corona-treated surface. ³ , MFR: 8.1 g/10 min, biomass degree: 95%) are melt-extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min to form a polyolefin resin layer (biomass degree: 95%, thickness 40 μm). Was formed to obtain a laminated body 5 in which a thermoplastic resin layer, a paper base material layer, and a polyolefin resin layer were laminated in this order.

[Comparative Example 2]
<Production of Laminate 6>
An acid resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight: 270 g/m2) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the fossil fuel-derived low density polyethylene ( Nippon Polyethylene Co., LC520, density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) is melt-extruded and laminated at a resin temperature of 320° C. and a line speed of 100 m/min. A thermoplastic resin layer (degree of biomass: 0%, thickness 20 μm) was formed. Next, after corona-treating the surface of the paper base material layer opposite to the thermoplastic resin layer, low-density polyethylene derived from fossil fuel (LC520, manufactured by Japan Polyethylene Corporation, density: 0.923 g) was applied to the corona-treated surface. /Cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) is extruded at a resin temperature of 320° C. and a line speed of 100 m/min to form a resin layer (biomass degree: 0%, thickness 40 μm). Was formed to obtain a laminated body 6 in which a thermoplastic resin layer, a paper base material layer, and a resin layer were laminated in this order.

[Example 5]
<Production of laminated body 7>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight: 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface was subjected to an anchor coating agent (Matsumoto Fine Chemical Co., Ltd.). Manufactured by WS-700) was applied and dried to form an anchor coat layer. Subsequently, on the anchor coat layer, 70 parts by mass of biomass-derived low-density polyethylene (manufactured by Braskem, SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%) and fossil. A mixed resin obtained by dry blending 30 parts by mass of low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) derived from a fuel, Melt extrusion lamination was performed at a resin temperature of 320° C. and a line speed of 100 m/min to form a thermoplastic resin layer (degree of biomass: 67%, thickness 20 μm). Next, after corona-treating the surface of the paper base material layer opposite to the thermoplastic resin layer, fossil fuel-derived low-density polyethylene (manufactured by Nippon Polyethylene Corporation) was applied to the corona-treated surface by a sand laminating method. , LC520, density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%, while extruding this adhesive resin layer (biomass degree: 0%, thickness 15 μm). The corona-treated surfaces of a fossil fuel-derived polyethylene terephthalate film (T4100, manufactured by Toyobo Co., Ltd., thickness 12 μm) that had been subjected to the corona treatment were laminated. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. Thereafter, 70 parts by mass of fossil fuel and 70 parts by mass of biomass-derived low-density polyethylene (manufactured by Braskem, SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%) on the anchor coat layer. A mixed resin obtained by dry blending with 30 parts by mass of low-density polyethylene (LC520, manufactured by Nippon Polyethylene Corporation, density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) derived from 320° C. Melt extrusion lamination at a resin temperature of 100 m/min at a line speed to form a polyolefin resin layer (biomass degree: 67%, thickness 40 μm), thermoplastic resin layer, anchor coat layer, paper base material layer, adhesion A laminate 7 was obtained in which a resin layer, a plastic film, an anchor coat layer, and a polyolefin resin layer were laminated in this order.

[Comparative Example 3]
<Preparation of laminated body 8>
An acid-resistant coated cup (manufactured by Chuetsu Pulp Industry Co., Ltd., basis weight: 270 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface was subjected to an anchor coating agent (Matsumoto Fine Chemical Co., Ltd.). Manufactured by WS-700) was applied and dried to form an anchor coat layer. Subsequently, fossil fuel-derived low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) was 320° C. on the anchor coat layer. The resin was melt-extruded and laminated at a resin temperature of 100 m/min at a line speed to form a thermoplastic resin layer (degree of biomass: 0%, thickness: 20 μm). Next, after corona-treating the surface of the paper base material layer opposite to the thermoplastic resin layer, fossil fuel-derived low-density polyethylene (manufactured by Nippon Polyethylene Corporation) was applied to the corona-treated surface by a sand laminating method. , LC520, density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%, while extruding this adhesive resin layer (biomass degree: 0%, thickness 15 μm). The corona-treated surfaces of a fossil fuel-derived polyethylene terephthalate film (T4100, manufactured by Toyobo Co., Ltd., thickness 12 μm) that had been subjected to the corona treatment were laminated. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. After that, fossil fuel-derived low-density polyethylene (LC520, manufactured by Nippon Polyethylene Corporation, density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) of 320° C. was applied on the anchor coat layer. Melt extrusion laminating at a resin temperature and a line speed of 100 m/min to form a resin layer (biomass degree: 0%, thickness 40 μm), a thermoplastic resin layer, an anchor coat layer, a paper base layer, an adhesive resin layer. Then, a laminated body 8 in which a plastic film, an anchor coat layer, and a resin layer were laminated in order was obtained.

[Example 6]
<Preparation of laminated body 9>
A cup base paper (manufactured by Nippon Paper Industries Co., Ltd., basis weight: 280 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface was subjected to a sand laminating method to produce fossil fuel. This adhesive resin layer (biomass degree: 0, while extruding low-density polyethylene (LC600A, manufactured by Japan Polyethylene Corporation, density: 0.919 g/cm ³ , MFR: 7.0 g/10 minutes, biomass degree: 0%) derived from %, thickness 15 μm), and the corona-treated surface of a fossil fuel-derived polyethylene terephthalate film (T4100, manufactured by Toyobo Co., Ltd., thickness 12 μm) subjected to corona treatment was bonded. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. Then, biomass-derived low-density polyethylene (manufactured by Braskem, SBC818, density: 0.918 g/cm ³ , MFR: 8.1 g/10 min, biomass degree: 95%) was placed on the anchor coat layer at a resin temperature of 320°C. Melt extrusion lamination at a line speed of 100 m/min to form a polyolefin resin layer (biomass degree: 95%, thickness 40 μm), paper base material layer, adhesive resin layer, plastic film, anchor coat layer, polyolefin resin A laminate 9 in which the layers were laminated in order was obtained.

[Comparative Example 4]
<Production of Laminate 10>
A cup base paper (manufactured by Nippon Paper Industries Co., Ltd., basis weight: 280 g/m ² ) was prepared as a paper base layer, and one surface was subjected to corona treatment, and then the corona-treated surface was subjected to a sand laminating method to produce fossil fuel. This adhesive resin layer (biomass degree: 0, while extruding low-density polyethylene (LC600A, manufactured by Japan Polyethylene Corporation, density: 0.919 g/cm ³ , MFR: 7.0 g/10 minutes, biomass degree: 0%) derived from %, thickness 15 μm), and the corona-treated surface of a fossil fuel-derived polyethylene terephthalate film (T4100, manufactured by Toyobo Co., Ltd., thickness 12 μm) subjected to corona treatment was bonded. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. Then, the same fossil fuel-derived low-density polyethylene as above was melt-extruded and laminated on the anchor coat layer at a resin temperature of 320° C. and a line speed of 100 m/min, and the resin layer (degree of biomass: 0%, thickness 40 μm). Was formed to obtain a laminate 10 in which a paper base layer, an adhesive resin layer, a plastic film, an anchor coat layer, and a resin layer were laminated in this order.

[Example 7]
<Preparation of laminated body 11>
A fossil fuel-derived polyethylene terephthalate film (TOYOBO Co., Ltd., T4100, thickness 12 μm) was used, and this was mounted on a delivery roll of a plasma chemical vapor deposition apparatus, and then the above polyethylene terephthalate film under the following conditions. A 200 Å-thick silicon oxide vapor-deposited film was formed on the corona-treated surface of Example 1 to obtain a silicon oxide vapor-deposited polyethylene terephthalate film 1.
(Deposition conditions)
Evaporated surface; Corona treated surface Introduced gas amount; Hexamethyldisiloxane: Oxygen gas: Helium = 1:3:3 (unit: slm)
Degree of vacuum in vacuum chamber: 2 to 6×10 ⁻⁶ mBar
Degree of vacuum in vapor deposition chamber: 2 to 5×10 ⁻³ mBar
Cooling/electrode drum power supply: 10kW
Line speed: 100m/min

A cup base paper (manufactured by Nippon Paper Industries Co., Ltd., basis weight 260 g/m ² ) is prepared as a paper base layer, and one side is subjected to corona treatment, and then the corona-treated side is subjected to a sand laminating method to obtain fossil fuel. This adhesive resin layer (the degree of biomass: 0, while extruding low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) derived from %, thickness 15 μm), the vapor deposition surface of the above-mentioned silicon oxide vapor deposition polyethylene terephthalate film 1 was bonded. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. Then, 70 parts by mass of biomass-derived low-density polyethylene (manufactured by Braskem, SBC818, density: 0.918 g/cm3, MFR: 8.1 g/10 min, biomass degree: 95%) and fossil fuel-derived on the anchor coat layer. 30 parts by mass of low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm3, MFR: 3.6 g/10 minutes, biomass degree: 0%) and a mixed resin of 320° C. Melt extrusion laminating at a temperature and line speed of 100 m/min to form a polyolefin resin layer (biomass degree: 67%, thickness 25 μm), paper base material layer, adhesive resin layer, barrier layer, plastic film, anchor coat A laminated body 11 in which the layers and the polyolefin resin layer were laminated in this order was obtained.

[Comparative Example 5]
<Production of Laminate 12>
A cup base paper (manufactured by Nippon Paper Industries Co., Ltd., basis weight 260 g/m ² ) is prepared as a paper base layer, and one side is subjected to corona treatment, and then the corona-treated side is subjected to a sand laminating method to obtain fossil fuel. This adhesive resin layer (the degree of biomass: 0, while extruding low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) derived from %, thickness 15 μm), the vapor deposition surface of the above-mentioned silicon oxide vapor deposition polyethylene terephthalate film 1 was bonded. Subsequently, an anchor coat agent (EL540/CAT-RT32 manufactured by Toyo Morton Co., Ltd.) was applied onto the polyethylene terephthalate film and dried to form an anchor coat layer. After that, fossil fuel-derived low-density polyethylene (LC520, manufactured by Nippon Polyethylene Corporation, density: 0.923 g/cm ³ , MFR: 3.6 g/10 minutes, biomass degree: 0%) of 320° C. was applied on the anchor coat layer. Melt extrusion laminating at resin temperature and line speed of 100 m/min to form a resin layer (biomass degree: 0%, thickness 25 μm), paper substrate layer, adhesive resin layer, barrier layer, plastic film, anchor coat A layered body 12 in which the layers and the resin layers were laminated in this order was obtained.

[Example 8]
<Production of Laminate 13>
A single-sided coated paper (manufactured by Mitsubishi Paper Mills Ltd., DMSC, basis weight 260 g/m ² ) was prepared as a paper base layer, one side was subjected to corona treatment, and then the sand laminating method was used on the corona-treated side. This adhesive resin layer (while extruding low-density polyethylene derived from fossil fuel (LC520, manufactured by Nippon Polyethylene Corp., density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) while extruding fossil fuel An aluminum foil (thickness 7 μm) was attached via a biomass degree: 95%, thickness 15 μm). Subsequently, a fossil fuel-derived ethylene-methacrylic acid copolymer (Nucrel N0908C, manufactured by Mitsui DuPont Polychemical Co., Ltd.) was melt-extruded and laminated on the aluminum foil to form a resin layer (thickness 12 μm). Furthermore, 70 parts by mass of biomass-derived low-density polyethylene (manufactured by Braschem, SBC818, density: 0.918 g/cm3, MFR: 8.1 g/10 minutes, biomass degree: 95%) and fossil fuel-derived material were formed on this resin layer. 30 parts by mass of low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm3, MFR: 3.6 g/10 minutes, biomass degree: 0%) and a mixed resin of 320° C. Melt extrusion lamination at a temperature and a line speed of 100 m/min to form a polyolefin resin layer (biomass degree: 95%, thickness 28 μm), a paper base material layer, an adhesive resin layer, a barrier layer, a resin layer, a polyolefin resin A laminated body 13 in which the layers were laminated in order was obtained.

[Comparative Example 6]
<Production of Laminate 14>
A single-sided coated paper (manufactured by Mitsubishi Paper Mills Ltd., DMSC, basis weight 260 g/m ² ) was prepared as a paper base layer, one side was subjected to corona treatment, and then the sand laminating method was used on the corona-treated side. This adhesive resin layer (while extruding low-density polyethylene derived from fossil fuel (LC520, manufactured by Nippon Polyethylene Corp., density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) while extruding fossil fuel An aluminum foil (thickness 7 μm) was attached via a biomass degree: 0%, thickness 15 μm). Subsequently, a fossil fuel-derived ethylene-methacrylic acid copolymer (Nucrel N0908C, manufactured by Mitsui DuPont Polychemical Co., Ltd.) was melt-extruded and laminated on the aluminum foil to form a resin layer (thickness 12 μm). Further, fossil fuel-derived low-density polyethylene (LC520, manufactured by Nippon Polyethylene Co., Ltd., density: 0.923 g/cm ³ , MFR: 3.6 g/10 min, biomass degree: 0%) of 320° C. was applied on the resin layer. Melt extrusion laminating at a resin temperature and a line speed of 100 m/min to form a resin layer (biomass degree: 0%, thickness: 28 μm), a paper base layer, an adhesive resin layer, a barrier layer, a resin layer, a resin layer. A laminated body 14 in which the above was sequentially laminated was obtained.

[Production Examples 1 to 14]
<Production of paper cup>
By combining the laminate for body member and the laminate for bottom member shown in Table 1 below, a paper cup was manufactured in the following steps. First, a frustoconical blank plate for forming a body of a paper cup was punched from the body member laminate. Next, the blank plate was rolled into a tubular shape, both ends thereof were partially overlapped, and the polymerized portion was subjected to hot air treatment, and the low density polyethylene resin layer existing in the polymerized portion was heated and melted. .. Subsequently, the body was pressed by a hot plate or the like to be stuck on the body to form a body seal portion, thereby manufacturing a tubular cup body portion constituting a paper cup.

On the other hand, the bottom member laminated body is punched into a circular shape to manufacture a disc that constitutes the bottom portion, and then the outer peripheral portion of the disc is erected into a cylindrical shape to form a bottom portion having the erected forming portion. Manufactured. Then, after inserting the bottom paper also manufactured in the upper part into the tubular cup body manufactured as described above, the cylindrical cup body and the bottom paper are blown with hot air or the like at the joint portion thereof. The resin layer existing in the joint portion was heated and melted. Then, the tip of the tubular cup body is bent inward by a curling die, and the tip of the tubular body of the cup is covered with the standing forming part that constitutes the bottom. By knurling the overlapping portion with the upright forming portion from the inner diameter side with a knurl, the above-mentioned tubular cup body portion and the bottom portion are closely adhered to each other to form a joint portion, and the above-mentioned tubular cup body portion is formed. A bottom of the paper cup was formed, which consisted of

Thereafter, the tip short part on the side opposite to the side where the bottom part of the cylindrical cup body is closely adhered to form a joint is curled while being bent outward by a curling mold in the same manner as above, and the top end is curled. An outward curl portion was formed to manufacture a paper cup having a full capacity of 382 cc.

<Performance evaluation test>
The following performance evaluation test was performed on the manufactured paper cup.

(Destructive inspection test)
The manufactured paper cup was subjected to a destructive inspection, and the adhesion state was visually evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.
(Evaluation criteria)
◯: The phenomenon of paper peeling was confirmed or the material was destroyed, and there was no problem in the adhesion state.
X: There was a seal abnormality, and the adhesion state was poor.

(Liquid leak test)
Each of the 40 manufactured paper cups was prepared, a neutral detergent (0.3% solution) was added to each paper cup, and the mixture was allowed to stand for 10 minutes, and then visually evaluated according to the following evaluation criteria. The evaluation results are shown in Table 1.
(Evaluation criteria)
◯: There was no liquid leakage, and the performance as a paper cup was good.
X: There was liquid leakage, and the performance as a paper cup was poor.

10, 20, 30 Laminated body 11 Paper base material layer 12 Polyolefin resin layer 13 Adhesive layer 14 Barrier layer 15 Plastic film 40 Paper cup 41 Flange portion 42 Body portion 43 Bottom portion 44 Exterior body 45 Convex portion 46 Gap

Claims (4)

At least a thermoplastic resin layer, a paper base layer, a laminate for a paper cup comprising a polyolefin resin layer in this order,
The polyolefin resin layer contains low-density polyethylene derived from biomass, which is a polymer of monomers containing ethylene derived from biomass,
The degree of biomass in the polyolefin resin layer is 5% or more,
The thermoplastic resin layer is low density polyethylene derived from fossil fuel ,
The innermost layer of the laminate for the paper cup is the polyolefin resin layer,
Ri outermost layer of the thermoplastic resin layer der of the paper cup stack,
A laminated body for a paper cup , wherein a body seal portion of the paper cup is formed by adhering the thermoplastic resin layer and the polyolefin resin layer . The laminate for a paper cup according to claim 1, wherein the laminate for a paper cup further has a barrier layer. The laminate for a paper cup according to claim 1 or 2 , wherein the laminate for a paper cup further has a printing layer. Comprising a paper cup for laminate according to any one of claims 1 to 3 paper cups.

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