JP2020163629A - Laminate, lid material and container with lid - Google Patents

Abstract

To enhance a biomass degree of a laminate used in a lid material and the like.SOLUTION: A laminate includes a base material layer, an adhesive resin layer, a metallic foil and a sealant layer in this order. The sealant layer includes a first layer, and a second layer positioned on the innermost surface of the laminate. The first layer and the second layer are layered directly or through a thermoplastic resin layer. The second layer contains low density polyethylene as main component, and polybutene-1. At least one of the adhesive resin layer and the sealant layer contains biomass-derived low density polyethylene.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminate and a lid material containing the same. The present invention also relates to a container with a lid containing a lid material.

In recent years, with the growing demand for the construction of a recycling-oriented society, there is a desire to break away from fossil fuels in the material field as well as energy, and the use of biomass is drawing attention. 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 application of biomass plastics using these biomass as raw materials is rapidly progressing, and attempts are being made to produce various resins from biomass raw materials.

As a biomass-derived resin, polylactic acid (PLA), which is produced via lactic acid fermentation, began commercial production in advance, but its biodegradable performance and current general-purpose plastics have performance as plastics. 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, a 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, the use of 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 in the production of polyethylene. For example, to date, research has been conducted on producing ethylene and butylene, which are raw materials for polyolefin resins, from renewable natural raw materials (see Patent Document 1). In the field of flexible packaging such as pouches, it has been proposed to apply such biomass-derived raw materials to packaging materials (see Patent Document 2).

Japanese Patent Publication No. 2011-506628 JP-A-2018-51788 Japanese Unexamined Patent Publication No. 2011-79584

Patent Document 3 discloses an easy-opening packaging material having an easy-opening property (easy peeling property) that can be easily opened when used as a lid material for a paper cup, and is also derived from biomass in such a field. It is hoped that the amount of fossil fuel used will be reduced by using raw materials.

The present invention has been made in consideration of such a point, and an object of the present invention is to increase the biomass degree of a laminate used for a lid material or the like.

The present invention is a laminate including a base material layer, an adhesive resin layer, a metal foil, and a sealant layer in this order, and the sealant layer includes a first layer and a second layer located on the innermost surface of the laminate. The first layer and the second layer are laminated either directly or via a thermoplastic resin layer, and the second layer contains low-density polyethylene as a main component and polybutene-1 and is bonded. At least one of the resin layer and the sealant layer is a laminate containing low density polyethylene derived from biomass.

In the laminate according to the present invention, the sealant layer may contain low-density polyethylene derived from biomass.

In the laminate according to the present invention, the second layer may contain low density polyethylene derived from biomass.

In the laminate according to the present invention, the content of low-density polyethylene in the second layer is more than 50% by mass and less than 90% by mass, and the content of polybutene-1 is 10% by mass or more and less than 50% by mass. Good.

In the laminate according to the present invention, the second layer does not have to contain a component derived from biomass.

In the laminate according to the present invention, the first layer may contain a thermoplastic resin.

In the laminate according to the present invention, the first layer may contain low-density polyethylene derived from biomass.

In the laminate according to the present invention, the adhesive resin layer may contain low-density polyethylene derived from biomass.

In the laminate according to the present invention, an anchor coat layer may be further provided between the metal foil and the sealant layer.

The present invention is a lid material containing the above-mentioned laminate.

The present invention is a container with a lid including the above-mentioned lid material and a container.

It is possible to provide a laminate having an increased degree of biomass and a lid material containing the same. In addition, a container with a lid containing this lid material can be provided.

It is sectional drawing which shows an example of the laminated body of this invention. It is sectional drawing which shows an example of the laminated body of this invention. It is sectional drawing which shows an example of the laminated body of this invention. It is sectional drawing which shows an example of the laminated body of this invention. It is a figure which shows an example of the container with a lid containing the laminated body of this invention. It is sectional drawing which shows an example of the container with a lid containing the laminated body of this invention. It is a figure which shows the layer structure of the laminated body of Examples 1-10 and Comparative Examples 1 and 2.

(Laminated body)
The laminate of the present invention includes at least a base material layer, an adhesive resin layer, a metal foil, and a sealant layer that are laminated in order from the outer surface side to the innermost surface side. The innermost surface is a surface of the lid material formed from the laminated body, which is located on the side of the contents. Further, although the outer surface is a surface located on the opposite side of the innermost surface, the laminated body may be provided with a further layer outside the layer located on the outer surface. 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 side to the inner surface side unless otherwise specified.

FIG. 1 is a cross-sectional view showing an example of the laminated body 10 of the present invention. The laminate 10 includes a base material layer 11, an adhesive resin layer 12, a metal foil layer 13, and a sealant layer 14 in this order, and the sealant layer 14 includes a first layer 15 and a second layer 16. The first layer 15 and the second layer 16 are directly laminated. The base material layer 11 constitutes the outer surface 10y of the laminated body 10, and the second layer 16 constitutes the innermost surface 10x of the laminated body 10.

FIG. 2 is a cross-sectional view showing another example of the laminated body 10 of the present invention. The laminate 10 includes a base material layer 11, an adhesive resin layer 12, a metal foil layer 13, and a sealant layer 14 in this order, and the sealant layer 14 includes a first layer 15, a thermoplastic resin layer 17, and the like. The second layer 16 is provided in this order. The first layer 15 and the second layer 16 are laminated via a thermoplastic resin layer 17. The base material layer 11 constitutes the outer surface 10y of the laminated body 10, and the second layer 16 constitutes the innermost surface 10x of the laminated body 10.

FIG. 3 is a cross-sectional view showing another example of the laminated body 10 of the present invention. The laminate 10 includes a base material layer 11, an adhesive resin layer 12, a metal foil layer 13, an anchor coat layer 18, and a sealant layer 14 in this order, and the sealant layer 14 includes a first layer 15 and a second layer. It includes a layer 16. The first layer 15 and the second layer 16 are directly laminated. The base material layer 11 constitutes the outer surface 10y of the laminated body 10, and the second layer 16 constitutes the innermost surface 10x of the laminated body 10.

FIG. 4 is a cross-sectional view showing another example of the laminated body 10 of the present invention. The laminate 10 includes a base material layer 11, an adhesive resin layer 12, a metal foil layer 13, an anchor coat layer 18, and a sealant layer 14 in this order, and the sealant layer 14 includes a first layer 15 and heat. The plastic resin layer 17 and the second layer 16 are provided in this order. The first layer 15 and the second layer 16 are laminated via a thermoplastic resin layer 17. The base material layer 11 constitutes the outer surface 10y of the laminated body 10, and the second layer 16 constitutes the innermost surface 10x of the laminated body 10.

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

In the laminate of the present invention, at least one of the adhesive resin layer and the sealant layer contains low-density polyethylene derived from biomass. In the present invention, the biomass degree described below is preferably 40% or more, and if the biomass degree is 60% or more and less than 98% in the entire laminate, the amount of fossil fuel used is reduced. It can reduce the environmental load. Unless otherwise specified, "biomass degree" means the weight ratio of biomass-derived components.

Here, low density polyethylene (LDPE) and linear low density polyethylene (LLDEP) will be described. The low-density polyethylene is a high-pressure ethylene homopolymer, and can be obtained by a conventionally known high-pressure radical polymerization method. The linear low-density polyethylene is a copolymer of ethylene and α-olefin polymerized using a multisite catalyst represented by a Ziegler-Natta catalyst or a single-site catalyst represented by a metallocene catalyst. All of them have a density of less than 930 kg / m ³ . Examples of α-olefins that serve as comonomer of linear low-density polyethylene include α-olefins having 3 to 20 carbon atoms, such as propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-nonene. Examples thereof include 4-methylpentene and the like, and mixtures thereof. Here, the density of polyethylene 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.

The above-mentioned single-site catalyst is a catalyst capable of forming a uniform active species, and is usually prepared by contacting a metallocene-based transition metal compound or a non-metallocene-based transition metal compound with an activation co-catalyst. Compared with the multisite catalyst, the single-site catalyst is preferable because it has a uniform active site structure and can polymerize a polymer having a high molecular weight and a high uniformity structure. As the single-site catalyst, it is particularly preferable to use a metallocene-based catalyst. The metallocene-based catalyst is a catalyst containing a transition metal compound of Group IV of the Periodic Table, which contains a ligand having a cyclopentadienyl skeleton, a cocatalyst, an organometallic compound if necessary, and each catalyst component of the carrier. is there.

In the transition metal compound of Group IV of the Periodic Table containing the ligand having the 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. It has at least one substituent selected from the 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 to form an indenyl ring, a fluorenyl ring, an azulenyl ring, a hydrogenated product thereof, or the like. It may be formed. Rings formed by bonding substituents to each other may further have substituents to each other.

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 ligands having a cyclopentadienyl skeleton, and the ligands having each cyclopentadienyl skeleton are preferably bonded to each other by a cross-linking group. Examples of the cross-linking group include a substituted silylene group such as an alkylene group having 1 to 4 carbon atoms, a silylene group, a dialkyl silylene group and a diaryl silylene group, and a substituted gel millene group such as a dialkyl gel millene group and a diaryl gel millene group. It is preferably a substituted silylene group.

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

The transition metal compound of Group IV of the Periodic Table, which contains a ligand having a cyclopentadienyl skeleton, may have one or a mixture of two or more as a catalyst component.

The co-catalyst is one in which the transition metal compound of Group IV of the Periodic Table can be effectively used as a polymerization catalyst, or the ionic charge in a catalytically activated state can be equalized. As co-catalysts, benzene-soluble organoxane of organoaluminum oxy compounds, benzene-insoluble organoaluminum oxy compounds, ion-exchange layered silicates, boron compounds, cations containing or not containing active hydrogen groups and non-coordinating anions are used. Examples thereof include ionic compounds, lanthanoid salts such as lanthanum oxide, tin oxide, and phenoxy compounds containing a fluoro group.

The transition metal compound of Group IV of the Periodic Table, which contains a ligand having a cyclopentadienyl skeleton, may be used by supporting it on a carrier of an inorganic or organic compound. As the carrier, a porous oxide of an inorganic or organic compound is preferable, and specifically, an ion-exchangeable 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, etc. or a mixture thereof can be mentioned.

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

<Biomass-derived ethylene>
The method for producing biomass-derived ethylene, which is a raw material for biomass-derived polyethylene (hereinafter, also referred to as biomass polyethylene), is not particularly limited and can be obtained by a conventionally known method. Hereinafter, an example of a method for producing ethylene-derived ethylene will be described.

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 raw 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 purified by contacting a culture solution containing a carbon source obtained from a plant raw material with a microorganism that produces ethanol or a product derived from a crushed product thereof. 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 the mixture, or removing water by membrane separation or the like can be mentioned.

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

A catalyst is usually used when ethylene is obtained by a dehydration reaction of ethanol, but the catalyst is not particularly limited, and a conventionally known catalyst can be used. 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 is preferable.

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

In the dehydration reaction of ethanol, the yield of the reaction depends on the amount of water contained in the ethanol supplied as a raw material. Generally, when a dehydration reaction is carried out, it is preferable that there is no water in consideration of the efficiency of removing water. However, in the case of the dehydration reaction of ethanol 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 presumed that it is not possible to suppress ethylene dimerization after dehydration without the presence of a small amount of water. The lower limit of the allowable water content is 0.1% by mass or more, preferably 0.5% by mass or more. Although the upper limit is not particularly limited, it is preferably 50% by mass or less, more preferably 30% by mass or less, and further preferably 20% by mass or less from the viewpoint of mass balance and heat balance.

By performing the ethanol dehydration reaction in this way, a mixed portion of ethylene, water and a small amount of unreacted ethanol can be obtained. However, since ethylene is a gas at about 5 MPa or less at room temperature, it is separated from these mixed portions by gas-liquid separation. Ethylene can be obtained except for 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, etc. are not particularly limited except that the operating pressure at this time is normal pressure or higher.

When the raw material is ethanol derived from ammonia, the obtained ethylene contains carbonyl compounds such as ketones, aldehydes, and esters, which are impurities mixed in the ethanol fermentation process, carbon dioxide gas, which is a decomposition product thereof, and decomposition products of enzymes. It contains a very small amount of nitrogen-containing compounds such as amines and amino acids, which are impurities, and ammonia, which is a decomposition product thereof. Depending on the use of ethylene, these trace amounts of impurities may cause a problem 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 conventionally known adsorbents can be used. For example, a material having a high surface area is preferable, and the type of adsorbent is selected according to the type and amount of impurities in ethylene obtained by the dehydration reaction of ethanol derived from biomass.

In addition, caustic water treatment may be used in combination as a method for purifying impurities in ethylene. When caustic water treatment is performed, 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.

<Biomass polyethylene>
Biomass polyethylene is obtained by polymerizing a monomer containing ethylene derived from biomass. As the biomass-derived ethylene, it is preferable to use the ethylene obtained by the above-mentioned production method. Since ethylene derived from biomass is used as the monomer as a raw material, the polyethylene polymerized is derived from biomass. When the biomass polyethylene is a low-density polyethylene derived from biomass, it is polyethylene polymerized by the above-mentioned polymerization method using ethylene derived from biomass. The raw material monomer for polyethylene does not have to contain 100% by mass of ethylene derived from biomass.

As long as the object of the present invention is not impaired, the monomer which is a raw material of biomass polyethylene may further contain ethylene derived from fossil fuel.

The biomass-derived ethylene concentration in the above polyethylene (hereinafter, may be referred to as “biomass degree”) is a value obtained by measuring the content of biomass-derived carbon by radiocarbon (C14) measurement. Since carbon dioxide in the atmosphere contains C14 at a fixed ratio (105.5 pMC), the C14 content in plants that grow by taking in carbon dioxide in the atmosphere, such as corn, is also about 105.5 pMC. It is known. It is also known that fossil fuels contain almost no C14. Therefore, by measuring the ratio of C14 contained in all carbon atoms in polyethylene, the ratio of biomass-derived carbon can be calculated and the weight ratio of biomass-derived components can be obtained.

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

In the present invention, the biomass polyethylene or the resin layer derived from biomass does not need to have a biomass degree of 100%. This is because if a raw material derived from biomass is used even in a part of the laminate, the purpose of the present invention is to reduce the amount of fossil fuel used as compared with the conventional case.

Hereinafter, each layer constituting the laminated body will be described.

(Base layer)
The base material layer needs to have mechanical strength capable of supporting other layers provided on the base material layer. The base material layer may be a paper base material.

The paper substrate preferably has a basis weight of 10 g / m ² or more and 200 g / m ² or less, more preferably 20 g / m ² or more and 150 g / m ² or less, and further preferably 50 g / m ² or more and 100 g / m ² or less. It is a thing. As the paper base material layer, white paperboard in general is targeted, but from the viewpoint of safety, it is particularly preferable to use Mr. Coat, ivory paper, milk carton base paper, cup base paper, etc. using natural pulp.

Further, as the paper substrate, neutral rosin, alkyl ketene dimer, alkenyl succinic anhydride may be used as the sizing agent, and cationic polyacrylamide, cationic starch or the like may be used as the fixing agent. It is also possible to use a sulfate band to make paper in a neutral region of pH 6 or more and pH 9 or less. In addition to the above sizing agents as required, in addition to fixing agents, various papermaking fillers, yield improvers, dry paper strength enhancers, wet paper strength enhancers, binders, dispersants, flocculants, plasticizers, etc. An agent and an adhesive may be appropriately contained.

The base material layer may be a layer containing at least one resin material. Examples of the resin material include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), 1,4-polycyclohexylene methylene terephthalate, and terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymer. Polyester such as polyester, nylon 6 and polyamide such as nylon 6,6, polyolefin such as polyethylene (PE), polypropylene (PP) and polymethylpentene, polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-acetic acid. Vinyl copolymer, vinyl resin such as polyvinyl butyral and polyvinylpyrrolidone (PVP), (meth) acrylic resin such as polyacrylate, polymethacrylate and polymethylmethacrylate, cellophane, cellulose acetate, nitrocellulose, cellulose acetate propionate. Examples thereof include cellulose resins such as (CAP) and polyethylene acetate butyrate (CAB), styrene resins such as polystyrene (PS), and chlorinated resins thereof.
In the present invention, "(meth) acrylic" means to include both "acrylic" and "methacrylic". Further, "(meth) acrylate" means to include both "acrate" and "metaaclate".

The base material layer may be a film containing the above resin material, and the film may be a stretched film or an unstretched film, but from the viewpoint of strength, it is uniaxially or biaxially oriented. A stretched film stretched to is preferable.

(Sealant layer)
The sealant layer includes a first layer and a second layer located on the innermost surface of the laminate. Further, the first layer and the second layer are laminated directly or via a thermoplastic resin layer. The sealant layer may contain low density polyethylene derived from biomass. As a result, the amount of fossil fuel used can be reduced.

(1st layer)
The first layer may contain a thermoplastic resin. The first layer can be formed by a conventionally known method, for example, a melt extrusion laminating method or a sand laminating method. The thermoplastic resin of the first layer includes a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or a copolymer resin containing these resins as a main component, a modified resin, or a mixture (alloy). Including) can be used. As the polyolefin resin, for example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), and metallocene catalyst are used. Polymerized ethylene-α-olefin copolymer, random or block copolymer of ethylene-polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer Combined (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, ionomer resin, and to improve adhesion between layers. An acid-modified polyolefin-based resin obtained by modifying the above-mentioned polyolefin-based resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid can be used. Further, as the polyolefin resin, a resin obtained by graft-polymerizing or copolymerizing an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer can be used. These materials can be used alone or in combination of two or more. As the cyclic polyolefin resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbonene can be used. These resins can be used alone or in combination of two or more.

The first layer may contain a material derived from biomass or a material derived from fossil fuel. When the first layer contains a biomass-derived material, it may contain biomass-derived polyethylene. Thereby, the biomass degree of the resin film can be further improved. As the biomass-derived polyethylene, low-density polyethylene derived from biomass is preferable.

The first layer preferably has a melt flow of 0.1 g / 10 minutes or more and 15 g / 10 minutes or less, more preferably 1 g / 10 minutes or more and 10 g / 10 minutes or less, and further preferably 2 g / 10 minutes or more and 9 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 first layer is 0.1 g / 10 minutes or more, the extrusion load during molding can be reduced. Further, when the first MFR is 15 g / 10 minutes or less, the mechanical strength of the sealant layer can be increased.

Density of the first layer is preferably not more than 901kg / ^{m 3} or more 945 kg / ^{m 3,} more preferably at most 905 kg / ^{m 3} or more ^{941kg / m 3, 910kg / m} 3 or more 935 kg / ^{m 3} or less Is more preferable. When the density of the first layer is 901 kg / m ³ or more, the rigidity of the sealant layer can be increased. Further, when the density of the first layer is 945 kg / m ³ or less, the mechanical strength of the sealant layer can be increased.

The thickness of the first layer is preferably 10 to 100 μm, more preferably 10 to 80 μm, and even more preferably 20 to 60 μm.

(2nd layer)
The second layer is located on the innermost surface of the laminated body and has an easy peeling property. Further, the second layer contains low-density polyethylene as a main component and polybutene-1. Lid materials having easy peeling properties are roughly classified into interfacial peeling type, delamination type, and coagulation peeling type depending on the difference in peeling mechanism. Among these, the coagulation peeling type exhibits easy peeling property by causing internal coagulation failure when the resin contained in the layer is opened. Polybutene-1 contained in the second layer is substantially incompatible with low-density polyethylene, and in these mixtures, the main component low-density polyethylene forms the "sea" and polybutene-1 forms the "islands". , So-called "sea island structure" is formed, and the cohesive force of the second layer is reduced. As a result, it becomes possible to cause coagulation fracture when the container with a lid is opened, and it is possible to exhibit the coagulation peeling type easy peeling property. In the present invention, the main component is a component exceeding 50% by mass among the components contained in the layer.

The content of polybutene-1 in the second layer is preferably 10% by mass or more and less than 50% by mass, more preferably 15% by mass or more and 45% by mass or less, and 25% by mass or more and 45% by mass or less. It is more preferable to have. Thereby, the easy peeling property can be further improved.

Polybutene-1 is preferably 0.1 g / 10 minutes or more and 10 g / 10 minutes or less, more preferably 0.2 g / 10 minutes or more and 9 g / 10 minutes or less, and further preferably 1 g / 10 minutes or more and 8.5 g / 10 minutes or less. It has the following melt flow rate (MFR). When the MFR of polybutene-1 is 0.1 g / 10 minutes or more, the extrusion load during molding can be reduced. Further, when the MFR of polybutene-1 is 10 g / 10 minutes or less, good easy peeling property can be exhibited.

The content of the low-density polyethylene in the second layer is preferably more than 50% by mass and 90% by mass or less, more preferably 55% by mass or more and 85% by mass or less, and 55% by mass or more and 75% by mass or less. It is more preferable to have. Thereby, the easy peeling property can be improved.

The low-density polyethylene preferably has a melt flow rate of 1 g / 10 minutes or more and 40 g / 10 minutes or less, more preferably 5 g / 10 minutes or more and 40 g / 10 minutes or less, and further preferably 10 g / 10 minutes or more and 40 g / 10 minutes or less. It has MFR). When the MFR of low-density polyethylene is 1 g / 10 minutes or more, the extrusion load during molding can be reduced. Further, when the MFR of the low density polyethylene is 40 g / 10 minutes or less, the mechanical strength of the sealant layer can be increased.

The density of low-density polyethylene is preferably not more than 901kg / ^{m 3} or more 930 kg / ^{m 3,} more preferably at most 905 kg / ^{m 3} or more ^{925kg / m 3, 910kg / m} 3 or more 920 kg / ^{m 3} or less Is more preferable. When the density of polybutene-1 is 901 kg / m ³ or more, the rigidity of the sealant layer can be increased. Further, when the density of polybutene-1 is 930 kg / m ³ or less, the mechanical strength of the sealant layer can be increased.

The second layer may contain low density polyethylene derived from biomass. As a result, the amount of fossil fuel used can be further reduced. Further, by using the low-density polyethylene of the second layer as the low-density polyethylene derived from biomass, the productivity of the container with a lid can be increased. In the manufacture of a container with a lid, there is a step of heat-sealing the lid material and the container after the contents are contained in the container. Biomass-derived low-density polyethylene contains more components having a molecular weight of 30,000 or less (hereinafter, also referred to as low-molecular-weight components) than fossil fuel-derived low-density polyethylene. This low molecular weight component is sticky. The low molecular weight component plays a role of temporary fixing when the lid material and the container are heat-sealed, and can suppress the misalignment of the lid material at the time of heat-sealing. This makes it possible to increase the productivity of the container with a lid.

The second layer may be a layer that does not contain components derived from biomass. As a result, the influence of the odor peculiar to the biomass component on the contents can be suppressed. The second layer may be a layer composed of low-density polyethylene derived from fossil fuel and polybutene-1 derived from fossil fuel. As a result, the influence of the odor peculiar to the biomass component on the contents can be suppressed, and the easy peeling property can be further improved.

(Thermoplastic resin layer)
The thermoplastic resin layer is a layer formed for laminating any two layers. The thermoplastic resin layer can be formed by a conventionally known method, for example, a melt extrusion laminating method or a sand laminating method. As the material of the thermoplastic resin layer, a polyolefin resin such as a polyethylene resin or a polypropylene resin, a cyclic polyolefin resin, or a copolymer resin containing these resins as a main component, a modified resin, or a mixture (alloy). Including) can be used. As the polyolefin resin, for example, low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), and metallocene catalyst are used. Polymerized ethylene-α-olefin copolymer, random or block copolymer of ethylene-polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethyl ethylene-ethyl acrylate copolymer Combined (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, ionomer resin, and to improve adhesion between layers. An acid-modified polyolefin-based resin obtained by modifying the above-mentioned polyolefin-based resin with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid can be used. Further, as the polyolefin resin, a resin obtained by graft-polymerizing or copolymerizing an unsaturated carboxylic acid, an unsaturated carboxylic acid anhydride, or an ester monomer can be used. These materials can be used alone or in combination of two or more. As the cyclic polyolefin resin, for example, cyclic polyolefins such as ethylene-propylene copolymer, polymethylpentene, polybutene, and polynorbonene can be used. These resins can be used alone or in combination of two or more.

The thermoplastic resin layer may contain a material derived from biomass or a material derived from fossil fuel.

(Metal leaf)
The laminate comprises a metal foil. The metal foil is a member obtained by rolling metal. When the laminate includes a metal layer, it is possible to improve the gas barrier property that blocks the transmission of oxygen gas, water vapor, and the like, and the light-shielding property that blocks the transmission of visible light, ultraviolet rays, and the like. Examples of the metal type used for the metal foil include aluminum, silver, gold, nickel, copper, chromium, and alloys thereof. Among these, aluminum is preferably used from the viewpoint of workability, cost and the like.

The thickness of the metal foil is preferably 3 to 20 μm, more preferably 5 to 15 μm.

(Adhesive resin layer)
The adhesive resin layer contains a thermoplastic resin. The adhesive resin layer can be formed by a conventionally known method, for example, a melt extrusion laminating method or a sand laminating method. As the thermoplastic resin of the adhesive resin layer, the same one as that of the thermoplastic resin of the first layer can be used.

The thickness of the adhesive resin layer is preferably 10 to 100 μm, more preferably 10 to 80 μm, and even more preferably 20 to 60 μm.

(Anchor coat layer)
The laminate may further include an anchor coat layer between the metal foil and the sealant layer. The anchor coat layer can be formed by applying an anchor coat agent to the surface on the side to be laminated and drying it. 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, a 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 nitric acid cotton may be used in combination to increase heat resistance.

The thickness of the anchor coat layer after drying is preferably 0.1 to 1 μm, more preferably 0.3 to 0.5 μm.

(Other layers)
The laminate may have at least one other layer in addition to the above layers. When two or more other layers are provided, they may have the same composition or different compositions. Examples of other layers include a print layer. The printed layer can be formed by using a conventionally known pigment or dye, and the forming method thereof is not particularly limited.

(Manufacturing method of laminated body)
Next, an example of the method for producing the laminate of the present invention will be described.

An example of the manufacturing method of the laminated body 10 shown in FIG. 1 will be described. First, the base material layer 11 is prepared. Subsequently, the base material layer 11 and the metal foil 13 are laminated via the adhesive resin layer 12 by the sand laminating method. Subsequently, the resin constituting the first layer 15 and the resin constituting the second layer 16 in the molten state are co-extruded onto the metal foil 13 by the melt extrusion laminating method, and the first layer 15 and the second layer 16 are combined. Are laminated. As a result, the laminate 10 including the base material layer 11, the adhesive resin layer 12, the metal foil 13, and the first layer 15 and the second layer 16 (sealant layer 14) can be obtained.

An example of the manufacturing method of the laminated body 10 shown in FIG. 2 will be described. First, the base material layer 11 is prepared. Subsequently, the base material layer 11 and the metal foil 13 are laminated via the adhesive resin layer 12 by the sand laminating method. Subsequently, by the melt extrusion laminating method, the resin constituting the first layer 15 in the molten state, the resin constituting the thermoplastic resin layer 17, and the resin constituting the second layer 16 are combined on the metal foil 13. Extruded, the first layer 15, the thermoplastic resin layer 17 and the second layer 16 are laminated. As a result, a laminate 10 including a base material layer 11, an adhesive resin layer 12, a metal foil 13, and a first layer 15, a thermoplastic resin layer 17, and a second layer 16 (sealant layer 14) can be obtained.

An example of the manufacturing method of the laminated body 10 shown in FIG. 4 will be described. First, the base material layer 11 is prepared. Subsequently, the base material layer 11 and the metal foil 13 are laminated via the adhesive resin layer 12 by the sand laminating method. Subsequently, the anchor coating agent is applied onto the metal foil 13 and dried to form the anchor coating layer 18. Subsequently, the resin constituting the first layer 15 in the molten state and the resin constituting the second layer 16 are co-extruded onto the anchor coat layer 18 by the melt extrusion laminating method, and the first layer 15 and the second layer 16 are co-extruded. And are laminated. As a result, the laminate 10 including the base material layer 11, the adhesive resin layer 12, the metal foil 13, the anchor coat layer 18, and the first layer 15 and the second layer 16 (sealant layer 14) can be obtained.

An example of the manufacturing method of the laminated body 10 shown in FIG. 4 will be described. First, the base material layer 11 is prepared. Subsequently, the base material layer 11 and the metal foil 13 are laminated via the adhesive resin layer 12 by the sand laminating method. Subsequently, the anchor coating agent is applied onto the metal foil 13 and dried to form the anchor coating layer 18. Subsequently, a resin forming the first layer 15 in a molten state, a resin forming the thermoplastic resin layer 17, and a resin forming the second layer 16 are placed on the anchor coat layer 18 by a melt extrusion laminating method. It is co-extruded and the first layer 15, the thermoplastic resin layer 17 and the second layer 16 are laminated. As a result, a laminate 10 including a base material layer 11, an adhesive resin layer 12, a metal foil 13, an anchor coat layer 18, and a first layer 15, a thermoplastic resin layer 17, and a second layer 16 (sealant layer 14) is obtained. be able to.

(Lid material)
The lid material 20 (see FIGS. 5 and 6) includes the above-mentioned laminate. The lid material can be produced by using the above-mentioned laminate. As the lid material, the second layer provided in the laminated body may be located on the innermost surface of the lid material. The innermost surface is a surface of the container with a lid, which is located on the content side of the container with a lid.

(Container with lid)
As shown in FIG. 5, the container with a lid 40 includes the lid material 20 and the container 30. The shape of the container 40 with a lid is not particularly limited, and may be a shape (cup shape) as shown in FIG.

FIG. 6 is a cross-sectional view of the container with a lid 40 shown in FIG. As shown in FIG. 6, the container with a lid 40 includes a container 30 and a lid material 20 adhered to the container 30. Of these, the container 30 has a main body portion 31 in which the opening portion 32 is formed, and a flange portion 33 provided at the upper end portion of the main body portion 31, that is, the peripheral edge of the opening portion 32 and extending outward in the horizontal direction. There is. Further, the lid material 20 is arranged on the flange portion 33 of the container 30 and is adhered to the flange portion 33. Adhesion between the lid material 20 and the container 30 can be performed by heat sealing. The heat sealing method is not particularly limited, and can be performed by using a conventionally known method such as bar sealing, high frequency sealing, and ultrasonic sealing.

In FIG. 6, the inner surface and the outer surface of the main body 31 of the container 30 are indicated by reference numerals 31a and 31b, respectively. Further, the surface of the flange portion 33 of the container 30 on the lid material 20 side is indicated by reference numeral 33a, and the surface on the side opposite to the lid material 20 is indicated by reference numeral 33b. Further, the surface of the lid material 20 on the container 30 side is indicated by reference numeral 20a, and the surface on the side opposite to the container 30 is indicated by reference numeral 20b.

As the container of the container with a lid, a container made of polystyrene, polypropylene, polyethylene, paper or the like can be used. Further, as the container of the container with a lid, coated paper such as polyethylene-coated paper can also be used.

The contents contained in the container with a lid include, for example, various foods and drinks, chemicals such as adhesives and adhesives, cosmetics, detergents, pharmaceuticals, miscellaneous goods such as chemical cairo, and various other articles. Can be mentioned.

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 1]
As a base material layer, coated paper having a weighing capacity of 80 g / m ² was prepared. Subsequently, the base material layer and the metal foil were bonded together via an adhesive resin layer by a sand laminating method. As the metal foil, a 7 μm aluminum foil (AL foil, manufactured by Toyo Aluminum K.K., trade name: 1N30 material) was used. As the adhesive resin layer, low-density polyethylene derived from biomass (petrified LDPE-A, manufactured by Braskem, trade name: SBC-818, density: 918 kg / m ³ , MFR: 8.1 g / 10 minutes, biomass degree 95%). Using. The thickness of the adhesive resin layer was 15 μm.

Subsequently, 3 g of the anchor coating agent was applied onto the metal foil and dried to form an anchor coating layer. As the anchor coating agent, a main agent and a curing agent were mixed at a ratio of 1: 1 and diluted with an ethyl acetate solvent so as to have a concentration of 4% by mass. A polyol (manufactured by Mitsui Chemicals, Inc., trade name: Takelac (registered trademark) A3210) is used as the main agent, and an isocyanate (manufactured by Mitsui Chemicals, Inc., trade name: Takenate (registered trademark) A3075) is used as the curing agent. )It was used.

On the other hand, 80 parts by mass of low-density polyethylene derived from biomass (Bio LDPE-B, manufactured by Brasschem, trade name: SPB-608, density: 915 kg / m ³ , MFR: 30.0 g / 10 minutes, biomass degree 95%). And 20 parts by mass of fossil fuel-derived polyethylene-1 (petrified PB1, manufactured by Mitsui Kagaku Co., Ltd., trade name: Toughmer (registered trademark) BL4000, density: 913 kg / m ³ , MFR: 1.3 g / 10 minutes) And were mixed to prepare a resin composition constituting the second layer in a molten state.

Subsequently, the resin constituting the first layer in the molten state and the resin composition constituting the second layer in the molten state are co-extruded onto the anchor coat layer to form the first layer and the second layer (sealant layer). Laminated. Bio-LDPE-A was used as the first layer. The thickness of the first layer was 50 μm. The thickness of the second layer was 10 μm. As a result, a laminated body was produced.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / AC / Bio LDPE-A_50 / Bio LDPE-B (80) + Petrified PB1 (20) _10
“/” Means the boundary between layers. "+" Means that the plurality of components are a blend layer. The numbers in "()" mean the blending ratio (unit: mass%) of each component in the blend layer. The number following "_" means the thickness of the layer (unit: μm). The leftmost layer is a layer that constitutes the outer surface of the packaging material, and the rightmost layer is a layer that constitutes the innermost surface of the packaging material.
"Paper" means a substrate layer. "Bio-LDPE-A" means low-density polyethylene derived from biomass (manufactured by Braskem, trade name: SBC-818). "AL foil" means aluminum foil (manufactured by Toyo Aluminum K.K., trade name: 1N30 material). "AC" means the anchor coat layer. "Bio-LDPE-B" means low-density polyethylene derived from biomass (manufactured by Braskem, trade name: SPB-608). "Petrified PB1" means polybutene-1 derived from fossil fuel (manufactured by Mitsui Chemicals, Inc., trade name: Toughmer (registered trademark) BL4000).

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 2]
As a base material layer, coated paper having a weighing capacity of 80 g / m ² was prepared. Subsequently, the base material layer and the metal foil were bonded together via an adhesive resin layer by a sand laminating method. As the metal foil, a 7 μm AL foil was used. Bio-LDPE-A was used as the adhesive resin layer. The thickness of the adhesive resin layer was 15 μm.

On the other hand, 60 parts by mass of bio-LDPE-B and 40 parts by mass of petrified polyethylene PB1 were mixed to prepare a resin composition constituting the second layer in a molten state.

Subsequently, the resin constituting the first layer in the molten state and the resin composition constituting the second layer in the molten state are co-extruded onto the metal foil, and the first layer and the second layer (sealant layer) are laminated. did. The first layer is an ethylene-methacrylic acid copolymer derived from fossil fuel (petrified EMAA, manufactured by Mitsui DuPont Polyethylene Co., Ltd., trade name: Nucrel (registered trademark) N0908C, density: 930 kg / m3, MFR: 8 .0 g / 10 minutes))) was used. The thickness of the first layer was 30 μm. The thickness of the second layer was 10 μm. As a result, a laminated body was produced.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / Petrified EMAA_30 / Bio LDPE-B (60) + Petrified PB1 (40) _10
"Petrified EMAA" means an ethylene-methacrylic acid copolymer derived from fossil fuel (manufactured by Mitsui-Dupont Polyethylene Co., Ltd., trade name: Nucrel (registered trademark) N0908C).

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 3]
Examples except that low-density polyethylene derived from fossil fuel (petrified LDPE-A, manufactured by Japan Polyethylene Corporation, trade name: Novatec (registered trademark) LC600A, MFR: 7.0) was used as the first layer. A laminate was produced in the same manner as in the case of 1.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / AC / Petrified LDPE-A_50 / Bio LDPE-B (80) + Petrified PB1 (20) _10
"Petrified LDPE-A" means low-density polyethylene derived from fossil fuel (manufactured by Japan Polyethylene Corporation, trade name: Novatec (registered trademark) LC600A).

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 4]
A laminate was produced in the same manner as in Example 1 except that petrified LDPE-A was used as the adhesive resin layer.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / AC / Bio LDPE-A_50 / Bio LDPE-B (80) + Petrified PB1 (20) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 5]
A laminate was produced in the same manner as in Example 2 except that petrified LDPE-A was used as the adhesive resin layer.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / Petrified EMAA_30 / Bio LDPE-B (60) + Petrified PB1 (40) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 6]
A laminate was produced in the same manner as in Example 1 except that petrified LDPE-A was used as the adhesive resin layer and the first layer.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / AC / Petrified LDPE-A_50 / Bio LDPE-B (80) + Petrified PB1 (20) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminated body of this example can be expected to suppress the misalignment of the lid material at the time of heat sealing.

[Example 7]
As the second layer, 80 parts by mass of low-density polyethylene derived from fossil fuel (petrified LDPE-B, manufactured by Asahi Kasei Corporation, trade name: Suntech (registered trademark) M6545, density: 915 kg / m ³ , MFR: 45 g / 10 A laminate was produced in the same manner as in Example 1 except that 20 parts by mass of petrified PB1 was used.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / AC / Bio LDPE-A_50 / Petrified LDPE-B (80) + Petrified PB1 (20) _10
"Petrified LDPE-B" means low-density polyethylene derived from fossil fuel (manufactured by Asahi Kasei Corporation, trade name: Suntech (registered trademark) M6545).

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminate of this example can be expected to suppress the influence of the odor peculiar to the biomass component on the contents.

[Example 8]
A laminate was produced in the same manner as in Example 2 except that 60 parts by mass of petrified LDPE-B and 40 parts by mass of petrified PB1 were used as the second layer.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / Petrified EMAA_30 / Petrified LDPE-B (60) + Petrified PB1 (40) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminate of this example can be expected to suppress the influence of the odor peculiar to the biomass component on the contents.

[Example 9]
Same as in Example 1 except that petrified LDPE-A was used as the first layer and 80 parts by mass of petrified LDPE-B and 20 parts by mass of petrified PB1 were used as the second layer. To prepare a laminate.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Bio LDPE-A_15 / AL Foil_7 / AC / Petrified LDPE-A_50 / Petrified LDPE-B (80) + Petrified PB1 (20) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminate of this example can be expected to suppress the influence of the odor peculiar to the biomass component on the contents.

[Example 10]
Same as in Example 1 except that petrified LDPE-A was used as the adhesive resin layer and 80 parts by mass of petrified LDPE-B and 80 parts by mass of petrified PB1 were used as the second layer. To prepare a laminate.

The layer structure of the laminated body of this embodiment is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / AC / Bio LDPE-A_50 / Petrified LDPE-B (80) + Petrified PB1 (20) _10

Subsequently, the laminated body of this example was used as a lid material to prepare a container with a lid. The lid material using the laminate of this example can be expected to suppress the influence of the odor peculiar to the biomass component on the contents.

[Comparative Example 1]
Petrified LDPE-A was used as the adhesive resin layer, petrified LDPE-A was used as the first layer, and 80 parts by mass of petrified LDPE-B and 20 parts by mass of petrified PB1 were used as the second layer. A laminate was produced in the same manner as in Example 1 except that the above was used.

The layer structure of the laminated body of this comparative example is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / AC / Petrified LDPE-A_50 / Petrified LDPE-B (80) + Petrified PB1 (20) _10

[Comparative Example 2]
Same as in Example 2 except that petrified LDPE-A was used as the adhesive resin layer and 60 parts by mass of petrified LDPE-B and 40 parts by mass of petrified PB1 were used as the second layer. To prepare a laminate.

The layer structure of the laminated body of this comparative example is expressed as follows.
Paper / Petrified LDPE-A_15 / AL Foil_7 / Petrified EMAA_30 / Petrified LDPE-B (60) + Petrified PB1 (40) _10

FIG. 7 summarizes examples of layer configurations of packaging materials of Examples 1 to 10 and Comparative Examples 1 and 2.

10: Laminated body 11: Base material layer 12: Adhesive resin layer 13: Metal foil 14: Sealant layer 15: First layer 16: Second layer 17: Thermoplastic resin layer 18: Anchor coat layer 20: Lid material 30: Container 31: Main body 32: Opening 33: Flange 40: Container with lid

Claims (11)

A laminate having a base material layer, an adhesive resin layer, a metal foil, and a sealant layer in this order.
The sealant layer includes a first layer and a second layer located on the innermost surface of the laminate.
The first layer and the second layer are laminated directly or via a thermoplastic resin layer.
The second layer contains low-density polyethylene as a main component and polybutene-1.
A laminate in which at least one of the adhesive resin layer and the sealant layer contains low-density polyethylene derived from biomass. The laminate according to claim 1, wherein the sealant layer contains low-density polyethylene derived from biomass. The laminate according to claim 1 or 2, wherein the second layer contains low-density polyethylene derived from biomass. 13. Laminated body. The laminate according to claim 1, wherein the second layer does not contain a component derived from biomass. The laminate according to any one of claims 1 to 5, wherein the first layer contains a thermoplastic resin. The laminate according to any one of claims 1 to 6, wherein the first layer contains low-density polyethylene derived from biomass. The laminate according to any one of claims 1 to 7, wherein the adhesive resin layer contains low-density polyethylene derived from biomass. The laminate according to any one of claims 1 to 8, further comprising an anchor coat layer between the metal foil and the sealant layer. A lid material comprising the laminate according to any one of claims 1 to 9. A container with a lid, comprising the lid material according to claim 10 and a container.