Container and manufacturing method thereof

Abstract

To provide a technology for providing a container having excellent impact resistance even when using biomass polypropylene having a high MFR. [Solution] The container has a main body having a plastic sheet molded to have a recess. The plastic sheet includes a polypropylene layer. The polypropylene layer includes a biomass-containing polypropylene and a biomass-free polypropylene. The biomass-containing polypropylene has an MFR (g / 10 min) of 3.0 or more. The biomass-free polypropylene has an MFR (g / 10 min) of 2.0 or more and less than 3.0.

Description

[Technical Field]

[0001] The present invention relates to a container and a method for manufacturing the same. [Background technology]

[0002] Plastic containers whose main body is formed from a plastic sheet are known. One such container is known to use plant-derived polypropylene (biomass polypropylene) (see, for example, Patent Document 1). By using biomass polypropylene, the amount of fossil-derived polypropylene used can be reduced. As a result, the amount of exhaustible resources used can be reduced, and CO2 emissions can be suppressed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-152666 Summary of the Invention [Problem to be solved by the invention]

[0004] When producing the above-mentioned containers, there are cases where only specific varieties of biomass polypropylene can be used for various reasons (for example, acquisition of certification by a certification organization, etc.).

[0005] The present inventors are also investigating specific varieties of biomass polypropylene for the purpose of obtaining certification, etc. However, the biomass polypropylene under investigation has a relatively high MFR (melt flow rate). Therefore, there is a need to obtain a container that has good physical properties while using biomass polypropylene with a relatively high MFR.

[0006] However, it was found that there is room for improvement in impact resistance for containers made from biomass polypropylene with a high MFR.

[0007] Therefore, an object of the present invention is to provide a technology for providing a container having excellent impact resistance even when using biomass polypropylene having a high MFR. [Means for solving the problem]

[0008] In one embodiment, the container according to the present invention comprises a main body having a plastic sheet molded to have a recess. The plastic sheet includes a polypropylene layer. The polypropylene layer includes a biomass-containing polypropylene and a biomass-free polypropylene. The biomass-containing polypropylene has an MFR (g / 10 min) of 3.0 or more. The biomass-free polypropylene has an MFR (g / 10 min) of 2.0 or more and less than 3.0. [Effects of the Invention]

[0009] According to the present invention, a technique is provided that makes it possible to obtain a container having excellent impact resistance even when biomass polypropylene having a relatively high MFR is used. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a container according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the main body (plastic sheet). [Figure 3A] FIG. 3A is a cross-sectional view that schematically illustrates a molding process using a mold. [Figure 3B] FIG. 3B is a cross-sectional view that schematically illustrates a molding step using a mold. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a container according to an embodiment of the present invention will be described with reference to the drawings.

[0012] (Summary) FIG. 1 is a schematic cross-sectional view showing a container 1 according to this embodiment. The container 1 has a main body 2. The main body 2 has a plastic sheet molded to have a recess. The main body 2 has a trunk 2-1 and a bottom 2-2. That is, the plastic sheet is molded to form the trunk 2-1 and the bottom 2-2. The trunk 2-1 and the bottom 2-2 are formed from the same plastic sheet.

[0013] Fig. 2 is a cross-sectional view of the main body 2 (plastic sheet 7). As shown in Fig. 2, the main body 2 includes a polypropylene layer 3. Specifically, the main body 2 includes polypropylene layers 3 (3-1 and 3-2), a barrier layer 5, and adhesive layers 4 (4-1 and 4-2).

[0014] Here, the polypropylene layer 3 contains biomass-containing polypropylene and biomass-free polypropylene. In other words, the polypropylene layer is formed using a mixture of biomass-containing polypropylene and biomass-free polypropylene as a raw material.

[0015] In this specification, the term "biomass-containing polypropylene" means, as the name suggests, polypropylene containing biomass, i.e., polypropylene containing plant-derived polypropylene.

[0016] On the other hand, "biomass-free polypropylene" means polypropylene that does not contain biomass. In other words, it means polypropylene that does not contain plant-derived polypropylene. Typically, "biomass-free polypropylene" is polypropylene made from fossil fuel-derived polypropylene.

[0017] Biomass-containing polypropylene has an MFR (g / 10 min) of 3.0 or more, while non-biomass-containing polypropylene has an MFR (g / 10 min) of 2.0 or more and less than 3.0.

[0018] The MFR values ​​in this specification are values ​​determined in accordance with Japanese Industrial Standards (K7210-1:2014 (ISO 1133-1:2011)) under conditions of 230°C and a load of 2.16 kg. The method for measuring the MFR will be described in detail in the examples below.

[0019] MFR is an index representing the fluidity of a resin. According to the findings of the present inventors, when a biomass-containing polypropylene with a high MFR (specifically, 3.0 g / 10 min or more) is used, the impact resistance of the resulting container tends to decrease. A high MFR means a small molecular weight. It is believed that the smaller the molecular weight, the weaker the intermolecular interaction. That is, as the molecular weight decreases, the weaker the intermolecular interaction becomes, and the fluidity increases, resulting in a high MFR, which is thought to make it difficult to absorb impact and reduce impact resistance. However, according to the present embodiment, a biomass-free polypropylene with an MFR (g / 10 min) of 2.0 or more and less than 3.0 is combined, thereby preventing a decrease in impact resistance. Despite the use of a biomass-containing polypropylene with a high MFR (3.0 g / 10 min or more), a container with high impact resistance can be obtained.

[0020] The above is an outline of this embodiment. Next, the details of this embodiment will be described.

[0021] (plastic sheet) The plastic sheet 7 constituting the main body 2 may be any sheet as long as it has a polypropylene layer 3. In the example shown in FIG. 2, the plastic sheet 7 includes two polypropylene layers 3 (3-1 and 3-2), as well as a barrier layer 5 and adhesive layers 4 (4-1 to 4-2). Specifically, the polypropylene layers 3 (3-1 to 3-2) are provided on both sides of the barrier layer 5, with adhesive layers 4 (4-1 to 4-2) interposed between them. However, the barrier layer 5 and adhesive layer 4 are not necessarily provided.

[0022] The thickness of the plastic sheet 7 may be any thickness that can maintain the shape (recess) of the main body portion 2. The thickness of the plastic sheet 7 is, for example, 0.3 to 3 mm, and preferably 0.5 to 2.0 mm.

[0023] (barrier layer) The barrier layer 5 is an optional layer provided for the purpose of blocking oxygen, etc. For example, a resin layer is used as the barrier layer 5. Examples of such resin layers include an EVOH (ethylene-vinyl alcohol copolymer) layer. The content of the barrier layer 5 in the plastic sheet 7 is, for example, 0.1 to 20 mass %, and preferably 2 to 10 mass %.

[0024] (adhesive layer) The adhesive layer 4 (4-1 to 4-2) is used to bond the barrier layer 5 and the polypropylene layer 3. Like the barrier layer 5, the adhesive layer 4 is also an optional layer. For example, a resin layer is used as the adhesive layer 4. The content of the adhesive layer 4 in the plastic sheet 7 is, for example, 0.1 to 6 mass %, preferably 0.5 to 4 mass %.

[0025] (Polypropylene layer) The polypropylene layer 3 (3-1 to 3-2) is a layer that occupies a major portion of the plastic sheet 7. As described above, the polypropylene layer is a layer that contains biomass-containing polypropylene and biomass-free polypropylene. Specifically, the polypropylene layer is a layer formed using a mixture of biomass-containing polypropylene and biomass-free polypropylene as a raw material.

[0026] The content of the polypropylene layer 3 (3-1 and 3-2) in the plastic sheet 7 is, for example, 50% by mass or more, preferably 70% by mass or more, and more preferably 80% by mass or more. The plastic sheet 7 may consist essentially of the polypropylene layer 3.

[0027] (Biomass-containing polypropylene) As mentioned above, "biomass-containing polypropylene" has an MFR (g / 10 min) of 3.0 or more and may contain plant-derived polypropylene. "Biomass-containing polypropylene" may also contain polypropylene other than plant-derived polypropylene (typically, polypropylene derived from fossil fuels).

[0028] Although there is no particular upper limit for the MFR (g / 10 min) of the biomass-containing polypropylene, it is, for example, 10.0 or less, preferably 5.0 or less, and more preferably 3.5 or less. Within this range, good impact resistance can be obtained.

[0029] Preferably, the "biomass-containing polypropylene" contains plant-derived polypropylene in an amount such that the biomass ratio is 10% or more. The biomass ratio of the "biomass-containing polypropylene" is more preferably 20% or more, and even more preferably 30% or more.

[0030] In this specification, the "biomass ratio" can be determined according to the method described in the examples below.

[0031] The content of "biomass-containing polypropylene" in the polypropylene layer 3 is, for example, 1 to 95 mass%, preferably 10 to 90 mass%, more preferably 20 to 80 mass%, and even more preferably 20 to 70 mass%. If the content of "biomass-containing polypropylene" is high, the amount of non-renewable resources used can be reduced, and CO2 emissions can be suppressed. On the other hand, if the content of "biomass-containing polypropylene" is low, it becomes easier to suppress a decrease in impact resistance.

[0032] (Biomass-free polypropylene) As described above, the term "biomass-free polypropylene" refers to polypropylene that does not contain biomass. Typically, the term "biomass-free polypropylene" refers to polypropylene made from polypropylene derived from fossil fuels.

[0033] As mentioned above, the MFR (g / 10 min) of the biomass-free polypropylene is 2.0 or more and less than 3.0. When the MFR (g / 10 min) of the biomass-free polypropylene is less than 3.0, the impact resistance of the container can be improved. On the other hand, when the MFR (g / 10 min) of the biomass-free polypropylene is 2.0 or more, the container can be easily molded using a mold.

[0034] The content of "biomass-free polypropylene" in the polypropylene layer is, for example, 1 to 95% by mass, preferably 10 to 90% by mass, more preferably 20 to 80% by mass, and even more preferably 20 to 70% by mass. A higher content of "biomass-free polypropylene" makes it easier to prevent a decrease in impact resistance. On the other hand, a lower content of "biomass-free polypropylene" allows for an increased amount of biomass-containing polypropylene, which is preferable from the viewpoints of exhaustible resources and CO2 emissions.

[0035] (Container manufacturing method and plastic elastic modulus) The plastic sheet 7 that constitutes the main body 2 preferably has a high modulus of elasticity at high temperatures.

[0036] Specifically, the plastic sheet has a melting point of 4.7 x 10 at 140°C. 7 Preferably, the plastic sheet has a storage modulus of 0.80×10 Pa or more at 140° C. 7 It is preferable that the loss modulus is at least Pa.

[0037] Having the above-mentioned elastic modulus, the transparency of the main body 2 can be increased when the plastic sheet is molded using a mold. This point will be described in more detail below with reference to an example of a method for manufacturing a container.

[0038] When manufacturing a container, a plastic sheet is first produced by extrusion molding or the like. Specifically, the raw materials for each layer are prepared. The raw material for the polypropylene layer can be prepared by mixing biomass-containing polypropylene and biomass-free polypropylene, as described above.

[0039] Next, the prepared raw material is formed into a sheet using an extruder (a multi-layer extruder if the plastic sheet has a multi-layer structure). This produces a plastic sheet. The plastic sheet is heated immediately after being formed by the extruder. A cooling roll is then used to cool the plastic sheet. A mirrored roll is used as the cooling roll. The surface roughness (arithmetic mean roughness Ra) of the mirrored roll is, for example, 0.2 μm or less. Because a mirrored roll is used, the surface of the plastic sheet 7 after extrusion molding is relatively smooth.

[0040] Next, the plastic sheet is heated to a temperature at which it softens, and is brought into contact with a mold in a heated state to form recesses. The heating temperature (plastic sheet temperature) is, for example, 120 to 170°C. Figures 3A and 3B are cross-sectional views schematically showing the molding process using a mold. Figure 3A shows the molding process when the plastic sheet 7 has a low elastic modulus. Figure 3B shows the molding process when the plastic sheet 7 has a high elastic modulus.

[0041] As shown in Figures 3A and 3B, the surface of the mold 6 (particularly the surface of the portion corresponding to the barrel) usually has larger irregularities than the surface of a mirror-finished roll. This is because, when the mold 6 is made, a surface finishing method different from that used for a mirror-finished roll is usually adopted. For example, the surface roughness (arithmetic mean roughness Ra) of the surface of the mold 6 is 1 µm or more. Rz is, for example, 2 µm or more.

[0042] If the elastic modulus of the plastic sheet 7 is small at high temperatures, the irregularities on the surface of the mold 6 are likely to be transferred to the plastic sheet 7, as shown in Figure 3A. As a result, the transparency of the obtained main body 2 is likely to decrease. In contrast, if the elastic modulus of the plastic sheet 7 is large at high temperatures, the irregularities on the mold are unlikely to be transferred, as shown in Figure 3B. Therefore, the decrease in transparency can be suppressed.

[0043] An example of a molding method using a mold is pressure molding. Preferably, the molding method is plug-assisted pressure molding. In plug-assisted pressure molding, molding is possible even at a relatively low sheet heating temperature by using a plug. Therefore, transparency can be improved. However, with a sheet having a low elastic modulus, sufficient transparency cannot be obtained due to the influence of plug surface transfer. In the present invention, a material with a high elastic modulus is used, so that plug surface transfer is less likely to occur, and the effects of the plug-assisted method can be fully obtained.

[0044] As described above, according to this embodiment, a highly transparent main body 2 can be obtained. In a preferred embodiment, the haze (total haze) of the trunk is 10 or less.

[0045] The upper limit of the elastic modulus of the plastic sheet is not particularly limited. However, from the viewpoint of formability when using a mold and impact resistance, the storage elastic modulus of the plastic sheet (140°C) is set to 9.3 × 10 7 The loss modulus of the plastic sheet (at 140°C) is preferably 1.60 x 10 Pa or less. 7 It is preferable that the pressure is 0.01 Pa or less.

[0046] The biomass ratio of the entire container can be set to, for example, 5 to 39%.

[0047] (Container use) The use of the container according to this embodiment is not particularly limited. However, since the container according to this embodiment has excellent impact resistance at low temperatures, it is preferably used as a container for refrigeration. Specifically, it is suitable for use in storage at 10°C or below. The storage temperature is more preferably 5°C or below.

[0048] [Example] Next, in order to explain the present invention in more detail, examples carried out by the present inventors will be described, although the present invention should not be limited to these examples.

[0049] Example 1 A multi-layer extruder was used to produce a plastic sheet having the layer structure shown in Figure 2. Specifically, a plastic sheet was produced having a structure in which a polypropylene layer (46% by mass), an adhesive layer (maleic acid-modified polypropylene, 1.5% by mass), a barrier layer (EVOH layer, 5% by mass), an adhesive layer (maleic acid-modified polypropylene, 1.5% by mass), and a polypropylene layer (46% by mass) were laminated in this order. The overall thickness of the plastic sheet was 0.9 mm. The raw material for the polypropylene layer was a mixture of biomass-containing polypropylene and biomass-free polypropylene with the following composition.

[0050] [Raw material composition of polypropylene layer] Biomass-containing polypropylene (28% by mass, Circulen renew plus HP456J, manufactured by Lycondellbasell, MFR = 3.4 (230°C), biomass content 46%) Biomass-free polypropylene (72% by mass, Noblen FH3011, manufactured by Sumitomo Chemical Co., Ltd., MFR = 2.3 (230°C))

[0051] The multilayer extruder used had a mirror-finished roll as a cooling roll, and the arithmetic mean roughness Ra of the mirror-finished roll was 0.2 μm or less.

[0052] The obtained plastic sheet was molded in a heated state using a plug-assist pressure molding machine to obtain the container according to Example 1. Specifically, the plastic sheet was molded to form a main body having a barrel and a bottom. Furthermore, during the plug-assist pressure molding, a mold was used in which the part corresponding to the barrel had an arithmetic mean roughness Ra of 1 μm or more.

[0053] Example 2 A container according to Example 2 was obtained in the same manner as in Example 1, except that the mixing ratio of the biomass-containing polypropylene and the biomass-free polypropylene was changed. Specifically, the content of the biomass-containing polypropylene was changed to 68% by mass, and the content of the biomass-free polypropylene was changed to 32% by mass.

[0054] (Comparative Example 1) A container according to Comparative Example 1 was obtained in the same manner as in Example 1 except that biomass-free polypropylene was used as the raw material for the polypropylene layer, instead of biomass-containing polypropylene.

[0055] [measurement] The elastic modulus (storage elastic modulus and loss elastic modulus), haze, and biomass ratio were measured using the following methods for the containers of Examples 1 and 2 and Comparative Example 1. Drop strength was also evaluated.

[0056] (storage modulus and loss modulus) The dynamic viscoelasticity of the bottom of the container was determined. Specifically, the dynamic viscoelasticity of the bottom of the container was measured in the range of 0 to 160°C using a rheometer (DHR-2, manufactured by TA Instruments). Based on the measurement results, the storage modulus at 140°C and the loss modulus at 140°C were determined. The measurement conditions for dynamic viscoelasticity were as follows: Geometry:Tension Frequency: 1Hz Amplitude: 25μm Measurement length: 15mm Measurement width: 10mm Heating rate: 5℃ / min

[0057] (Biomass ratio) Using the container as a sample, the biomass ratio was calculated by measuring the radiocarbon concentration according to Method B of ASTM D6866-22. Specifically, the sample was combusted to generate carbon dioxide. The generated carbon dioxide was purified in a vacuum line. The purified carbon dioxide was reduced with hydrogen using iron as a catalyst to generate graphite (C). The graphite was packed into a 1 mm inner diameter cathode using a hand press, which was then fitted into a wheel and attached to the measurement device. A dedicated 14C-AMS instrument (NEC Corporation) based on a tandem accelerator was used for the measurement. 14C counting and 13C concentration (13C / 12C) and 14C concentration (14C / 12C) were measured. Oxalic acid (HOxII), provided by the National Institute of Standards (NIST), was used as a standard sample. Measurements of the standard sample and background sample were also performed simultaneously. The 13C concentration of the sample (13C / 12C) was calculated, and the deviation from the reference sample, expressed in parts per thousand (‰), was calculated as δ13C. The biomass ratio was calculated by applying the atmospheric correction factor REF (pMC) for 2019-2022 to the calculated δ13C.

[0058] (Hayes) Using a turbidity meter (NDH7000II, manufactured by Nippon Denshoku Industries Co., Ltd.), the total haze and internal haze of the body of the container were measured with a measurement light beam of φ5 mm. After standard calibration with an air layer, the body of the container was cut and clamped in the measuring device to measure the total haze. For internal haze, liquid paraffin was placed in a glass cell, standard calibration was performed, and then the body of the container was cut and placed in the glass cell filled with liquid paraffin to measure the internal haze. Total haze was evaluated using the following three-point scale. [Evaluation criteria] 〇: Total haze is less than 10 △: Total haze is 10 or more and less than 20 ×: Total haze is 20 or more

[0059] (Drop strength) After filling the container to the brim with water, the opening was sealed. The container was then stored overnight at a specified temperature (23°C or 5°C). After storage, the container was dropped twice onto concrete from specified heights (80cm, 120cm, and 150cm) using a drop tester to check whether the container broke. Ten samples were evaluated under the same conditions, and the number of broken containers was counted. Based on the results at a storage temperature of 5°C and a height of 80cm, the drop strength was evaluated according to the following criteria. [Evaluation criteria] 〇: No cracks ×: Cracks present

[0060] (Results and Discussion) Table 1 shows the results of the composition, storage modulus, loss modulus, total haze, drop strength, and biomass content of the containers for Examples 1 and 2 and Comparative Example 1. In Table 1, "bio-containing PP" means biomass-containing polypropylene. "Non-bio-containing PP" means biomass-free polypropylene. In addition to Examples 1 and 2 and Comparative Example 1, Table 1 also shows the results of Prediction Examples 1 to 3. These results of Prediction Examples 1 to 3 were predicted based on the actual measured values ​​for Examples 1 and 2 and Comparative Example 1.

[0061] Table 2 shows detailed results of the drop strength test for Examples 1 and 2 and Comparative Example 1. Table 3 shows detailed results of haze measurement for Examples 1 and 2 and Comparative Example 1.

[0062] First, the results of the drop strength test will be considered. As shown in Table 2, no cracks were observed in Examples 1 and 2 and Comparative Example 1 at a storage temperature of 23°C. This indicates that Examples 1 and 2 and Comparative Example 1 all have practically acceptable drop strength (impact resistance). However, when looking at the results under the harsh storage condition of 5°C, Example 1 is superior in drop strength to Example 2, and the results are comparable to those of Comparative Example 1. In other words, the drop strength is better when the content of biomass-containing polypropylene having an MFR (g / 10 min) of 3.0 or more is lower. From this, as shown in Predictive Example 3 in Table 1, it is predicted that the drop strength will be rated "X" when the content of biomass-containing polypropylene having an MFR (g / 10 min) of 3.0 or more is 100%. On the other hand, in the examples (Predictive Examples 1 and 2, Examples 1 and 2) in which biomass-free polypropylene having an MFR (g / 10 min) of 2.0 or more and less than 3.0 was used in addition to the content of biomass-containing polypropylene having an MFR (g / 10 min) of 3.0 or more, it can be seen that the drop strength was improved compared to Predictive Example 3.

[0063] Next, the transparency will be considered. From the results of Example 1, Example 2 and Comparative Example 1, it can be seen that the larger the modulus of elasticity (storage modulus and loss modulus), the smaller the total haze tends to be. In other words, it can be seen that the transparency tends to be higher. And, 4.7 × 10 7 Storage modulus (140°C) of 0.80 x 10 Pa or more 7 It can be seen that in Predictive Example 1, Example 1, Example 2 and Predictive Example 2, which have a loss modulus (140° C.) of at least Pa, a haze of less than 10 is obtained.

[0064] As shown in Table 3, the internal haze values ​​were the same in Example 1, Example 2, and Comparative Example 1. Therefore, it can be understood that the difference in total haze between Example 1, Example 2, and Comparative Example 1 is not a difference in internal haze, but a difference in haze on the container surface, resulting from a difference in the roughness of the irregularities on the container surface. This result supports the assumption that the higher the elastic modulus of the plastic sheet, the less likely it is that the irregularities on the mold surface are transferred to the container during molding using a mold, resulting in higher transparency.

[0065] [Table 1] [Table 2] [Table 3]

[0066] (Addendum) Representative aspects of the present invention will be summarized below as appendices.

[0067] (Appendix 1) a container comprising: a main body having a plastic sheet molded to have a recess; the plastic sheet including a polypropylene layer; the polypropylene layer including a biomass-containing polypropylene and a biomass-free polypropylene; the biomass-containing polypropylene having an MFR (g / 10 min) of 3.0 or more; and the biomass-free polypropylene having an MFR (g / 10 min) of 2.0 or more and less than 3.0.

[0068] (Appendix 2) 10. The container of claim 1, wherein the plastic sheet has a melting point of 4.7×10 at 140° C. 7 A container having a storage modulus of at least 1 Pa.

[0069] (Appendix 3) 3. The container according to claim 1 or 2, wherein the plastic sheet has a melting point of 0.80×10 at 140° C. 7 A container with a loss modulus of elasticity of 1 Pa or more.

[0070] (Appendix 4) 4. The container according to any one of Supplementary Notes 1 to 3, wherein the biomass ratio of the container is 5 to 39%.

[0071] 5. The container according to any one of claims 1 to 4, wherein the main body comprises a bottom and a body, and the body has a haze of 10 or less.

[0072] (Appendix 6) 6. The container according to any one of appendices 1 to 5, wherein the plastic sheet further comprises a barrier layer having oxygen barrier properties.

[0073] (Appendix 7) A method for manufacturing a container according to any one of Supplementary Notes 1 to 6, comprising the step of forming the recesses by bringing the plastic sheet into contact with a mold in a heated state.

[0074] (Appendix 8) 8. The manufacturing method according to claim 7, wherein the step of forming the recess includes the step of forming the recess by plug-assisted pressure forming. [Explanation of symbols]

[0075] 1 Container, 2 Main body, 3 (3-1 to 3-2) Polypropylene layer, 4 (4-1 to 4-2) Adhesive layer, 5 Barrier resin layer, 6 Mold, 7 Plastic sheet

Claims

1. a body portion having a plastic sheet molded with a recess; Equipped with the plastic sheet comprises a polypropylene layer; the polypropylene layer comprises a biomass-containing polypropylene and a biomass-free polypropylene; The biomass-containing polypropylene has an MFR (g / 10 min) of 3.0 or more, The biomass-free polypropylene has an MFR (g / 10 min) of 2.0 or more and less than 3.0, container.

2. 10. The container of claim 1, The plastic sheet has a melting point of 4.7 x 10 at 140°C. ７ Pa or more storage modulus, container.

3. 3. The container according to claim 1 or 2, The plastic sheet has a thickness of 0.80 x 10 ７ Pa or more loss modulus, container.

4. 3. The container according to claim 1 or 2, The biomass content of the container is 5 to 39%. container.

5. 3. The container according to claim 1 or 2, The main body portion includes a bottom portion and a trunk portion, The haze in the body portion is 10 or less. container.

6. 3. The container according to claim 1 or 2, The plastic sheet further has a barrier layer having oxygen barrier properties. container.

7. A method for manufacturing the container according to claim 1 or 2, forming the recesses by contacting the plastic sheet with a mold in a heated state; Equipped with Manufacturing method.

8. The manufacturing method according to claim 7, The step of forming the recess includes forming the recess by plug-assisted pressure forming. Manufacturing method.

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