JP2021160127A - Laminated sheet, container, and method for producing laminated sheet - Google Patents

Abstract

To provide a laminated sheet predominantly composed of a polypropylene resin, the laminated sheet having biomass-derived polyethylene applied thereto and having suitable mechanical properties and transparency.SOLUTION: A laminated sheet has: a first substrate layer containing a first crystalline resin; and a second substrate layer provided on at least one side of the first substrate layer and containing a second crystalline resin. The first crystalline resin is predominantly composed of a resin mixture of polyethylene and polypropylene, and at least a part of the polyethylene is biomass-derived polyethylene.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laminated sheet, a container, and a method for manufacturing the laminated sheet.

In recent years, the use of biomass has been attracting attention for the purpose of reducing the environmental load. Biomass is an organic compound photosynthesized from carbon dioxide and water, and is a so-called carbon-neutral renewable energy that becomes carbon dioxide and water again by using biomass.
In recent years, the practical application of biomass plastics made from such biomass is rapidly advancing. For example, attempts have been made to produce various resins from biomass raw materials, and studies have been made to replace some of the plastic raw materials with biomass-derived raw materials.

However, although the biomass-derived resin has an effect of reducing the environmental load, it exhibits properties different from those of the fossil-derived resin, and mere replacement may reduce the mechanical and other physical characteristics.
In particular, for polypropylene, which is a transparent crystalline resin, when polyethylene derived from biomass is added, problems such as a decrease in rigidity and a deterioration in transparency occur.

An object of the present invention is to provide a laminated sheet, a container, and a method for producing a laminated sheet having suitable mechanical properties and transparency by applying polyethylene derived from biomass in a laminated sheet containing a polypropylene resin as a main component. It is to be.

According to one aspect of the present invention, the laminated sheet is a laminated sheet, which is formed on a first base material layer containing the first crystalline resin and at least one surface of the first base material layer. It is provided with a second base material layer provided and formed by containing a second crystalline resin, and the first crystalline resin is mainly composed of a resin in which polyethylene and polypropylene are mixed, and is made of the polyethylene. At least in part, a laminated sheet of polyethylene derived from biomass is provided.

In the laminated sheet according to one aspect of the present invention, the content of polyethylene may be 30.0% by mass or less with respect to the entire first base material layer. The content of the biomass-derived polyethylene is 0.5% by mass or more and 30.0% by mass or less, preferably 0.5% by mass or more and 25.0% by mass or less with respect to the entire first base material layer. Yes, more preferably 1.0% by mass or more and 20.0% by mass or less, further preferably 2.0% by mass or more and 10.0% by mass or less, and particularly preferably 3.0% by mass or more and 5.0. It is mass% or less.

In the laminated sheet according to one aspect of the present invention, the content of polyethylene may be 30.0% by mass or less with respect to the entire laminated sheet. The content of the biomass-derived polyethylene is 0.5% by mass or more and 30.0% by mass or less with respect to the entire laminated sheet, preferably 0.5% by mass or more and 25.0% by mass with respect to the entire laminated sheet. It is mass% or less, more preferably 1.0 mass% or more and 20.0 mass% or less, further preferably 2.0 mass% or more and 10.0 mass% or less, and particularly preferably 2.0 mass% or less. It is 4.0 mass% or less.

In the laminated sheet according to one aspect of the present invention, the melt flow rate of the biomass-derived polyethylene may be 0.3 g / 10 minutes or more and 4.0 g / 10 minutes or less.
In the laminated sheet according to an embodiment of the present invention, the density of the polyethylene from the biomass, may be 898kg / ^{m 3} or more 925 kg / ^{m 3} or less.

In the laminated sheet according to one aspect of the present invention, the ratio of the total thickness of the second base material layer to the thickness of the first base material layer (total thickness of the second base material layer / thickness of the first base material layer). ) May be 1/99 or more and 20/80 or less.
The container according to one aspect of the present invention may be composed of at least a part of a molded product formed from any of the above-mentioned laminated sheets.

According to one aspect of the present invention, a first base material layer formed by containing the first crystalline resin and a second base material layer provided on at least one surface of the first base material layer and containing the second crystalline resin are contained. A method for producing a laminated sheet including a second base material layer formed in the above, wherein the first crystalline resin contains a resin in which polyethylene and polypropylene are mixed as a main component, and at least a part of the polyethylene. Is a biomass-derived polyethylene, and is a laminated sheet in which the first crystalline resin and the second crystalline resin are rapidly cooled in a state of being laminated immediately after being extruded in a molten state, respectively, to form a laminated sheet. A manufacturing method is provided.

It is an enlarged sectional view of the laminated sheet which concerns on one Embodiment of this invention. It is an enlarged sectional view of the laminated sheet which concerns on one Embodiment of this invention. It is sectional drawing which shows the container which concerns on one Embodiment of this invention. It is a schematic block diagram which shows the manufacturing apparatus which manufactures the laminated sheet of an Example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

In the present embodiment, a laminated sheet according to one aspect of the present invention and a container formed of at least a part of a molded body formed from the laminated sheet will be described.

[Laminated sheet]
FIG. 1 is an enlarged cross-sectional view of the laminated sheet of the present embodiment. The laminated sheet 1 according to the present embodiment is formed by laminating at least three layers of the first base material layer 2 and the second base material layers 3A and 3B provided on both sides of the first base material layer 2.

(First base material layer)
The first base material layer 2 formed by containing the first crystalline resin contains, as the first crystalline resin, at least a resin obtained by mixing a polypropylene-based resin and a polyethylene-based resin as a main component.
The polypropylene-based resin may be a polymer containing at least propylene. Examples of the polymer containing propylene include homopolypropylene and a copolymer of propylene and olefin. The copolymer of propylene and olefin may be a block copolymer or a random copolymer. Alternatively, it may be a mixture of these.
From the viewpoint of heat resistance and hardness, the polypropylene-based resin in the present embodiment is preferably homopolypropylene.

The melt flow rate of the polypropylene-based resin contained in the first base material layer 2 is preferably 0.5 g / 10 minutes or more and 5.0 g / 10 minutes or less. The melt flow rate is measured in accordance with JIS K 7210-1 at a measurement temperature of 230 ° C. and a load of 2.16 kg.

The polyethylene-based resin may be a polymer containing at least ethylene. Examples of the polyethylene-based resin include low-density polyethylene-based resins, particularly linear low-density polyethylene-based resins.
The polyethylene-based resin in the present embodiment contains at least a part of biomass-derived polyethylene. Examples of the material of polyethylene derived from biomass include corn, cassava, sugar cane, sugar beet, palm palm, soybean, and castor. Further, the biomass-derived polyethylene may be produced by any method such as fermentation, bacterial fermentation, chemical change, and culture extraction. Such biomass-derived polyethylene may be, for example, low-density polyethylene derived from biomass.
Further, as the polyethylene-based resin, a polyethylene-based resin derived from fossil fuel and a polyethylene-based resin derived from biomass may be used in combination.

The melt flow rate of the polyethylene-based resin containing the above-mentioned biomass-derived polyethylene is preferably 0.3 g / 10 minutes or more and 4.0 g / 10 minutes or less. The melt flow rate is measured in accordance with JIS K 7210-1, at a measurement temperature of 190 ° C. and a load of 2.16 kg.

The density of polyethylene resin containing polyethylene from above biomass is preferably 898kg / ^{m 3} or more 925 kg / ^{m 3} or less.

The content of the polyethylene-based resin is preferably 30.0% by mass or less with respect to the entire first base material layer 2. The content of the polyethylene-based resin containing the biomass-derived polyethylene described above is 0.5% by mass or more and 30.0% by mass or less, preferably 0.5% by mass, based on the entire first base material layer 2. % Or more and 25.0% by mass or less, more preferably 1.0% by mass or more and 20.0% by mass or less, still more preferably 2.0% by mass or more and 10.0% by mass or less, and particularly preferably. It is 3.0% by mass or more and 5.0% by mass or less.

The first base material layer 2 may contain a polypropylene resin, a resin other than the polyethylene resin, additives and the like.

The thickness T _B1 of the first base material layer 2 is not particularly limited. It is appropriately set depending on the use of the laminated sheet 1 and the molded product.

(Second base material layer)
The second base material layers 3A and 3B formed by containing the second crystalline resin contain a polypropylene-based resin as the second crystalline resin.

The melt flow rate of the polypropylene-based resin contained in the second base material layers 3A and 3B is 30.0 g / 10 minutes or less, more preferably 15.0 g / 10 minutes or more and 25.0 g / 10 minutes or less. preferable. The melt flow rate is measured in accordance with JIS K 7210-1 at a measurement temperature of 230 ° C. and a load of 2.16 kg.

The second base material layers 3A and 3B may contain a resin other than the polypropylene-based resin, an additive, and the like in addition to the polypropylene-based resin.
The second substrate layers 3A and 3B may contain a nucleating agent. Examples of the nucleating agent include a sorbitol-based crystal nucleating agent. Examples of commercially available products include Gelol MD (manufactured by Shin Nihon Rika Co., Ltd.) and Rikemaster FC-2 (manufactured by Riken Vitamin Co., Ltd.).

The thickness _{T B2} of the second base layer 3A and 3B are not particularly limited. The thickness _TB2 is appropriately set depending on the use of the laminated sheet 1 and the molded product.

_{The thickness T All} of the entire laminated sheet 1 is appropriately set depending on the use of the laminated sheet 1 and the molded product. For example, the thickness T _All can be 0.25 mm or more and 0.35 mm or less.
Regarding the total thickness T _All of the laminated sheet 1, the ratio of the total thickness of the second base material layers 3A and 3B to the thickness of the first base material layer 2 (total thickness of the second base material layers 3A and 3B / first group). The thickness of the material layer 2) is preferably 1/99 or more and 20/80 or less. More preferably, the above ratio is 5/95 or more and 15/85 or less.

Further, the content of the polyethylene-based resin is preferably 30.0% by mass or less with respect to the entire laminated sheet 1. The content of the polyethylene-based resin containing the biomass-derived polyethylene described above is 0.5% by mass or more and 30.0% by mass or less with respect to the entire laminated sheet 1, preferably with respect to the entire laminated sheet 1. It is 0.5% by mass or more and 25.0% by mass or less, more preferably 1.0% by mass or more and 20.0% by mass or less, and further preferably 2.0% by mass or more and 10.0% by mass or less. Particularly preferably, it is 2.0% by mass or more and 4.0% by mass or less.

The ratio of plant-derived carbon to the total carbon content in the polyethylene resin is called the biomass degree, and is determined by measuring the concentration of C14 contained in the polyethylene resin. That is, while the atmosphere contains a certain proportion of C14, the carbon of the petroleum-derived resin does not contain C14. Therefore, the degree of biomass is determined by measuring the concentration of 14C contained in the polyethylene resin. be able to. Specifically, when all the carbon in the polyethylene resin is derived from petroleum, the biomass degree is 0%, and when all the carbon in the polyethylene resin is derived from plants, the biomass degree is 100%. The blending ratio of the biomass-derived polyethylene resin in the present invention can be confirmed by, for example, this method. Specifically, for example, it can be confirmed by the B method of ASTM D6866.

Further, the structure is not limited to the three-layer structure composed of the first base material layer 2 and the second base material layers 3A and 3B as in the above-mentioned laminated sheet 1, and a multi-layer structure of four or more layers may be used. The laminated sheet having a multilayer structure of four or more layers may have other layers in addition to the first base material layer and the second base material layer, for example. For example, in the laminated sheet 1 of FIG. 1, a laminated sheet having another layer (not shown) between the first base material layer 2 and the second base material layers 3A and 3B can be mentioned. Examples of other layers include a barrier layer, an adhesive layer, an anti-fog layer containing an anti-fog agent, and the like.

Further, the laminated sheet may have the second base material layer 3 on only one side of the first base material layer 2. For example, as shown in FIG. 2, a laminated sheet 1A in which the second base material layer 3 is laminated on only one side of the first base material layer 2 may be used.

[container]
FIG. 3 is a cross-sectional view showing the container of the present embodiment.
As shown in FIG. 3, the container 50 of the present embodiment is composed of a container body 30 and a lid 40.

[Container body configuration]
The container body 30 is composed of a base material layer 31 and a surface layer 32. The container body 30 is obtained by molding a resin sheet composed of the base material layer 31 and the surface layer 32 into a desired shape having the flange 30a shown in FIG. Examples of the molding method include a vacuum forming method and a compressed air forming method.
The base material layer 31 of the container body 30 is basically not particularly limited as long as it is a thermoformed material. For example, polypropylene, polystyrene, polyamide, polyethylene terephthalate, polycarbonate, polyethylene naphthalate and the like are exemplified. These materials may be used alone or in combination. Preferably polypropylene is used. Examples of polypropylene include homopolypropylene, block copolymers or random copolymers of propylene and ethylene, and block copolymers or random copolymers of propylene, ethylene and butene.
Further, for example, polymer alloys such as polypropylene and polystyrene and rubber-modified polystyrene can be used to improve synthesis and moldability.
Further, the base material layer 31 of the container body 30 can contain various additives in the resin. For example, an inorganic filler can be included to improve rigidity.

Further, the container body 30 may be configured to include a layer other than the base material layer 31, if necessary. For example, an adhesive resin layer or the like may be included in addition to the base material layer 31.
The surface layer 32 of the container body 30 is preferably made of polypropylene resin or polyethylene resin in order to have oil resistance, chemical resistance, and heat resistance.

[Closure structure]
The lid 40 is composed of a first base material layer 41 and second base material layers 42A and 42B. The lid 40 is obtained by molding the above-mentioned laminated sheet 1 into a desired shape having the flange 40a shown in FIG. Examples of the molding method include a vacuum forming method and a compressed air forming method.
The lid 40 is molded using the laminated sheet 1 of the present embodiment. Therefore, the first base material layer 41 of the lid 40 is composed of the first base material layer 2 of the laminated sheet 1 described above, and the second base material layers 42A and 42B of the lid 40 are formed of the laminated sheet 1 described above. It is composed of the second base material layers 3A and 3B.
At the time of the above molding, the lid 40 is preferably thermoformed at a temperature equal to or lower than the melting point of the polypropylene-based resin in the base material layer of the laminated sheet. By thermoforming the lid 40 at a temperature equal to or lower than the melting point of the polypropylene resin, the fine crystal structure is maintained and the lid is highly transparent.
The melting point of the polypropylene resin in the base material layer of the laminated sheet can be measured by differential scanning calorimetry (DSC).
Since the lid 40 in the present embodiment is molded using the laminated sheet of the present embodiment, biomass-derived polyethylene is applied and has suitable mechanical properties and transparency.

[How to seal the container body and lid]
When the container body 30 and the lid 40 are sealed and sealed, the flange 30a of the container body 30 and the flange 40a of the lid 40 are overlapped, and the overlapped flanges 30a and 40a are attached from the lid side with a seal bar. Heat seal and adhere.
The sealing temperature is preferably 170 ° C. or higher and 220 ° C. or lower, and more preferably 180 ° C. or higher and 200 ° C. or lower. When the sealing temperature is 170 ° C. or higher, the sealing time can be shortened and the productivity is improved. Further, if the temperature is 220 ° C. or lower, there is no possibility that the base material layer will melt and cause edge breakage.
The sealing pressure is preferably 1 MPa or more and 5 MPa or less, the sealing time is preferably 0.5 seconds or more and 5 seconds or less, the sealing pressure is 2 MPa or more and 4 MPa or less, and the sealing time is more preferably 1 second or more and 3 seconds or less. When the sealing pressure is 1 MPa or more, sufficient sealing strength can be obtained. Further, if the sealing pressure is 5 MPa or less, there is no risk of edge breakage.
By heat-sealing under the above heat-sealing conditions, a container having high sealing properties can be obtained.

Inside the container 50, for example, it is used for foods such as foods, seasonings, food raw materials, and beverages, secondary packaging for pharmaceutical products, and daily miscellaneous goods. Furthermore, not only solids but also liquids, mixtures thereof, and various other objects to be packaged can be filled.

[Modification example]
The best configuration for carrying out the present invention and the like are disclosed in the above description, but the present invention is not limited thereto. That is, although the present invention has been described mainly with respect to a specific embodiment, the material, quantity, and other details with respect to the above-described embodiments without departing from the scope of the technical idea and purpose of the present invention. In such a configuration, those skilled in the art can make various modifications.
Therefore, the description that limits the material, layer structure, etc. disclosed above is merely an example description for facilitating the understanding of the present invention, and does not limit the present invention. For this reason, the description with a name excluding some or all of the restrictions on the materials and the like is included in the present invention.

In the above embodiment, the container 50 having the lid 40 formed by molding the laminated sheet 1 has been described as an example, but the present invention is not limited to such an embodiment. For example, a container body in which the laminated sheet 1 is molded may be provided. In this case, both the lid body and the container body may be a molded body of the laminated sheet 1, or the container body may be a molded body of the laminated sheet 1, and the lid body may be a general-purpose film.

Further, the planar shape of the container 50 can be various shapes such as a circular shape, a square shape, and an elliptical shape. Further, although the dome shape is exemplified as the cross-sectional shape of the lid body 40, it may be a flat shape.

Further, the joining of the container body 30 and the lid 40 is not limited to heat sealing, and various joining methods such as welding by ultrasonic waves and bonding using an adhesive or the like can be used.
When the airtightness of the container 50 is not required, the heat seals of the flange 30a of the container body 30 and the flange 40a of the lid 40 do not have to be continuously formed along the outer peripheral edge, and are formed intermittently. May be done.

Further, not only the form of the container 50 composed of the container body 30 and the lid 40, but also the container body 30 and the lid 40 are integrally molded, and the container body is formed by a hinge formed in a part in the circumferential direction of the flange. The 30 and the lid 40 may be connected to each other.

Hereinafter, examples and comparative examples according to the present invention will be described. The present invention is not limited to these examples.

[Examples 1 to 5, and Comparative Example 1 and Comparative Example 2]
Using the manufacturing apparatus 10 shown in FIG. 4, the laminated sheet 1B was manufactured as follows.
According to the composition described later, a plurality of types of molten resins are co-extruded as a sheet-like material 1a from the T-die 11 of the extruder, and the sheet-like material 1a is co-extruded on the first cooling roll 21 with the metal endless belt 25 and the fourth. It was sandwiched between the cooling roll 22 and the cooling roll 22. In this state, the sheet-like object 1a was pressure-welded and rapidly cooled by the first cooling roll 21 and the fourth cooling roll 22 at the arc portion corresponding to the central angle θ1 of the first cooling roll 21.
Subsequently, the sheet-like material 1a is sandwiched between the metal endless belt 25 and the fourth cooling roll 22 at the arc portion corresponding to the substantially lower half circumference of the fourth cooling roll 22, and the sheet-like material 1a is surface-pressed and sprayed with cooling water. The sheet-like object 1a was further rapidly cooled by spraying the cooling water on the back surface side of the metal endless belt 25 by the nozzle 26. The sprayed cooling water was collected in the water tank 27, and the collected water was discharged through the drainage ditch 27a.
After surface pressure welding and cooling with the fourth cooling roll 22, the sheet-like material 1a in close contact with the metal endless belt 25 was moved onto the second cooling roll 23 with the rotation of the metal endless belt 25. Here, the sheet-like object 1a guided by the peeling roll 29 and pressed toward the second cooling roll 23 is, as described above, formed by the metal endless belt 25 at the arc portion corresponding to substantially the upper half circumference of the second cooling roll 23. It was surface pressure welded and cooled again. The water adhering to the back surface of the metal endless belt 25 was removed by a water absorption roll 28 provided during the movement from the fourth cooling roll 22 to the second cooling roll 23.
The sheet-like material 1a (laminated sheet 1B) cooled on the second cooling roll 23 was then peeled from the metal endless belt 25 by the peeling roll 29.
The surface of the first cooling roll 21 is coated with an elastic material 21a made of nitrile-butadiene rubber (NBR). The surface of the second cooling roll 23 is also coated with an elastic material (not shown) made of nitrile-butadiene rubber (NBR).
Further, the temperature of the metal endless belt 25 can be adjusted by a cooling means (not shown) such as a water cooling type built in the third cooling roll 24 or the like.

The composition of each layer of the laminated sheet 1B is as shown in Table 1. According to this composition, each laminated sheet 1B was produced by the above-mentioned method. Next, a container having a diameter of 100 mm and a depth of 10 mm was molded from the manufactured laminated sheet 1B by a general vacuum compressed air molding machine.

Each component in Table 1 is as follows.
PP1: Homopolypropylene (melt flow rate 3.0 g / 10 minutes (230 ° C, 2.16 kg), isotactic pentad fraction 0.94)
PP2: Homopolypropylene (melt flow rate 20.0 g / 10 minutes (230 ° C, 2.16 kg), isotactic pentad fraction 0.94)
-PP3: Homopolypropylene (melt flow rate 3.0 g / 10 minutes (230 ° C, 2.16 kg), isotactic pentad fraction 0.97)
-PE1: Metallocene-based ethylene-α-olefin copolymer-1 (melt index 3.5 g / 10 minutes (190 ° C., 2.16 kg), density 905 kg / m ³ )
-PE2: Linear low-density polyethylene (melt index 1.0 g / 10 minutes (190 ° C, 2.16 kg), density 916 kg / m ³ )

The PE2 (linear low-density polyethylene-based resin) described above is a biopolyethylene derived from a plant, more specifically from sugar cane.

The isotactic pentad fraction is an isotactic pentad fraction in a pendat unit (a unit in which five propylene monomers are continuously isotactically bonded) in a molecular chain of a resin composition. A method for measuring this fraction is described in, for example, Macromolecules, Vol. 8, pp. 687, and can be measured by ^{13 C-NMR.}

Then, the characteristics of the laminated sheet and the characteristics of the container in each example were obtained by the following methods. The results obtained are shown in Table 1.
(1) Tensile characteristics As tensile characteristics, "elastic modulus", "yield strength", "break strength", and """Elongation" was measured and compared / evaluated.
The laminated sheet was measured in the extrusion direction (MD direction) of molding and in the vertical direction (TD direction) of the MD direction.

(2) Optical characteristics As optical characteristics, "haze" was measured using a haze meter NDH2000 (manufactured by Nippon Denshoku Kogyo Co., Ltd.) in accordance with JIS K 7136.

[Evaluation results]
As is clear from the results shown in Table 1, Examples 1 to 5 of the present embodiment in which biomass-derived polyethylene is applied are applied to biomass-derived polyethylene in both the laminated sheet and the container after molding. It was confirmed that it had mechanical properties equal to or higher than those of Comparative Example 1 and Comparative Example 2 and had transparency.
As is clear from Examples 1 to 5, the content of polyethylene is 30.0% by mass or less with respect to the entire first base material layer, and the content of polyethylene derived from biomass is the first base material. It is 0.5% by mass or more and 30.0% by mass or less, preferably 0.5% by mass or more and 25.0% by mass or less, and more preferably 1.0% by mass or more and 20.0% by mass with respect to the entire layer. % Or less, more preferably 2.0% by mass or more and 10.0% by mass or less, and particularly preferably 3.0% by mass or more and 5.0% by mass or less.
Further, assuming that the ratio of the total thickness of the second base material layer to the thickness of the first base material layer (total thickness of the second base material layer / thickness of the first base material layer) is, for example, 10/90, the content of polyethylene Is 27.0% by mass or less with respect to the entire laminated sheet, and the content of polyethylene derived from biomass is 0.45% by mass or more and 27.0% by mass or less with respect to the entire laminated sheet, preferably 0. It is .45% by mass or more and 22.5% by mass or less, more preferably 0.9% by mass or more and 18.0% by mass or less, and further preferably 1.8% by mass or more and 9.0% by mass or less. Particularly preferably, it is 2.7% by mass or more and 4.5% by mass or less.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

1,1A, 1B ... Laminated sheet, 2 ... First base material layer, 3,3A, 3B ... Second base material layer, 40 ... Lid, 50 ... Container.

Claims (8)

It is a laminated sheet
The laminated sheet is
A first base material layer formed by containing the first crystalline resin and a second base material provided on at least one surface of the first base material layer and formed by containing the second crystalline resin. With layers,
The first crystalline resin is a laminated sheet containing a resin in which polyethylene and polypropylene are mixed as a main component, and at least a part of the polyethylene is biomass-derived polyethylene. The content of the biomass-derived polyethylene is 30.0% by mass or less with respect to the entire first base material layer.
The laminated sheet according to claim 1. The content of the biomass-derived polyethylene is 30.0% by mass or less with respect to the entire laminated sheet.
The laminated sheet according to claim 1 or 2. The melt flow rate of the biomass-derived polyethylene is 0.3 g / 10 minutes or more and 4.0 g / 10 minutes or less.
The laminated sheet according to any one of claims 1 to 3. Density polyethylene from the biomass is 898kg / ^{m 3} or more 925 kg / ^{m 3} or less,
The laminated sheet according to any one of claims 1 to 4. The ratio of the total thickness of the second base material layer to the thickness of the first base material layer (total thickness of the second base material layer / thickness of the first base material layer) is 1/99 or more and 20/80 or less. Is,
The laminated sheet according to any one of claims 1 to 5. A container characterized in that at least a part thereof is composed of a molded product formed from the laminated sheet according to any one of claims 1 to 6. A first base material layer formed by containing the first crystalline resin and a second base material provided on at least one surface of the first base material layer and formed by containing the second crystalline resin. A method for manufacturing a laminated sheet including a layer.
The first crystalline resin contains a resin in which polyethylene and polypropylene are mixed as a main component, and at least a part of the polyethylene is biomass-derived polyethylene.
A method for producing a laminated sheet, wherein the first crystalline resin and the second crystalline resin are rapidly cooled in a state of being laminated immediately after being extruded in a molten state, respectively, to form a laminated sheet.

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