Caps, containers, containers with caps, and containers containing contents

Abstract

To provide a cap that can maintain plug opening torque, while increasing a ratio of biomass plastics to the total mass.SOLUTION: A cap 50 comprises: a plug main body 10 made of polyolefin which is fitted to a mouth part of a container and has a discharge port which discharges contents stored in the container; an inner plug 20 made of polyolefin which has an insertion part 22 that is inserted into the discharge port, which seals the discharge port by making the insertion part 22 tightly adhere to an inner peripheral surface 14A of the discharge port; and an upper lid 30 made of poly olefin which holds the inner plug 20 and can be attached to and detached from the plug main body 10 together with the inner plug 20. A ratio Bi of biomass plastics to the total mass of the inner plug 20 is lower than a ratio of Bo biomass plastics to the total mass of the upper lid 30.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] One aspect of this disclosure relates to caps, containers, capped containers, and containers containing contents. [Background technology]

[0002] For resin containers, resin caps are often constructed from multiple components, such as an inner stopper and an outer lid, to ensure airtightness until opening and to improve strength and ease of handling. For example, Patent Document 1 proposes a cap that includes an outer cap made of polyolefin resin and an inner stopper made of PET resin.

[0003] Such resin caps and containers are recycled or sorted to ensure the effective use of resources. Recently, plastics such as polyethylene made from biomass-derived raw materials have been developed from the perspective of reducing environmental impact and carbon dioxide emissions. For example, Patent Document 2 proposes a resin composition containing plant-derived polyethylene. Patent Document 3 proposes a blow-molded multilayer container made of synthetic resin having a surface layer containing plant-derived ethylene-based resin. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-160729 [Patent Document 2] Japanese Patent Publication No. 2021-31563 [Patent Document 3] Japanese Patent Publication No. 2015-134632 [Overview of the project] [Problems that the invention aims to solve]

[0005] To create a carbon-neutral cap, it is desirable to use biomass-derived plastic and to have a high biomass plastic content. On the other hand, changing the material of the plastic cap to increase the biomass plastic content raises concerns about changes in dimensional accuracy and properties. Therefore, this disclosure aims to provide a cap that can maintain the opening torque while increasing the biomass plastic content. Furthermore, this disclosure aims to provide a container to which such a cap is attached, a capped container equipped with such a cap, and a container containing contents. [Means for solving the problem]

[0006] The opening torque of a resin cap composed of multiple components depends on the frictional force of the contact points. The inventors' research found that increasing the biomass plastic content of each component of the cap uniformly lowers the opening torque when opening the cap. This is thought to be because incorporating biomass-derived plastic reduces the frictional force between the sliding components. Possible reasons for this decrease in frictional force include subtle variations in dimensional accuracy due to the incorporation of biomass-derived plastic and / or changes in the material composition.

[0007] Therefore, one aspect of this disclosure provides a cap comprising: a polyolefin stopper body that is attached to the mouth of a container and has a discharge port for discharging contents contained in the container; a polyolefin inner stopper having an insertion part that is inserted into the discharge port, the insertion part of which adheres tightly to the inner circumferential surface of the discharge port to seal the discharge port; and a polyolefin top lid that holds the inner stopper and is configured to be detachably attached to the stopper body together with the inner stopper, wherein the biomass plasticity Bi of the inner stopper is lower than that of the top lid.

[0008] The above cap comprises a stopper body, an inner stopper, and an upper lid, all made of polyolefin. Because it comprises at least three components, the biomass plastic content of each component can be flexibly adjusted. Furthermore, in this cap, the biomass plastic content Bi of the polyolefin inner stopper, which tightly seals the outlet by adhering to its inner surface, is lower than that of the upper lid's biomass plastic content Bo. This allows for a high opening torque when opening the cap. Thus, this cap allows for maintaining the opening torque of the cap while increasing the biomass plastic content Bo of the upper lid.

[0009] In the cap described above, when attaching or detaching the top lid to the stopper body, the surface of the inner stopper and at least one of the retaining part that holds the inner stopper and the inner circumferential surface of the discharge port may slide against each other. In the cap described above, since the biomass plasticity Bi of the inner stopper is lower than the biomass plasticity Bo of the top lid, the decrease in frictional force generated on the surface of the inner stopper when sliding can be suppressed. Therefore, the biomass plasticity of the entire cap can be improved while maintaining the opening torque of the cap. For example, when attaching or detaching the top lid to the stopper body, the inner circumferential surface of the discharge port and the outer circumferential surface of the insertion part that is in close contact with the inner circumferential surface may slide against each other.

[0010] In the cap described above, the stopper body and the top lid may be fixed together by screwing together the male threads on the stopper body and the female threads on the top lid. This allows the opening torque to be maintained even if the biomass plastic content of the top lid and stopper body is high.

[0011] In the cap described above, the stopper body is attached by pressing it into the mouth of the container, and the biomass plastic content Bm of the stopper body may be lower than that of the top lid Bo. This increases the flexibility of the stopper body and reduces the pressing strength measured when pressing the stopper body into the container.

[0012] In the above cap, the biomass plastic degree Bo of the upper lid may satisfy the following formula (1). By satisfying formula (1), the biomass plastic degree of the entire cap can be made sufficiently high. Bo > 30% (1)

[0013] In the above cap, the biomass plastic degree Bi of the inner plug and the biomass plastic degree Bm of the plug body may satisfy the following formula (2). By satisfying formula (2), while sufficiently suppressing the variation of the opening torque of the cap, the plugging strength measured when plugging the plug body into the container can be made sufficiently low. 10% > Bm ≥ Bi (2)

[0014] In the above cap, the upper lid may contain polyethylene derived from biomass and block polypropylene, the plug body may contain linear low-density polyethylene resin, and the inner plug may contain high-density polyethylene resin. Such a cap can be manufactured at a low manufacturing cost and has excellent sealing properties. Also, such an upper lid is excellent in impact resistance, so it is difficult to break even when dropped and has excellent durability.

[0015] In the above cap, the ratio of the mass of the upper lid to the mass of the inner plug may be 5 or more. In the above cap, the ratio of the mass of the upper lid to the mass of the entire cap may be 0.5 or more. By making the biomass plastic degree Bo of the upper lid high, the biomass plastic degree of the entire cap can be made sufficiently high.

[0016] One aspect of the present disclosure is a container having a mouth portion to which any of the above caps is attached, wherein the biomass plastic degree Bc of the container is greater than the biomass plastic degree Bi of the inner plug. By using such a container, the biomass plastic degree of the container with a cap can be made sufficiently high.

[0017] The above container may contain biomass-derived polyethylene terephthalate. With such a container, it is possible to sufficiently increase the biomass plastic degree while sufficiently maintaining various functions required for the container.

[0018] One aspect of the present disclosure provides a container with a cap, which includes any of the above caps and a container having a mouth portion to which the cap is attached. Since such a container with a cap includes any of the above caps, it is possible to maintain the opening torque while increasing the biomass plastic degree of the cap. Also, since the sealing performance is sufficiently excellent, leakage can be sufficiently suppressed.

[0019] The above container may contain biomass-derived polyethylene terephthalate. With such a container, it is possible to sufficiently increase the biomass plastic degree of the container with a cap while sufficiently maintaining various functions required for the container.

[0020] One aspect of the present disclosure provides a container containing contents, which includes any of the above containers with a cap and the contents accommodated in the container with a cap. Since such a container containing contents includes any of the above caps, it is possible to maintain the opening torque while increasing the biomass plastic degree of the cap. Also, since the sealing performance is sufficiently excellent, leakage can be sufficiently suppressed.

Advantages of the Invention

[0021] It is possible to provide a cap that can maintain the opening torque while increasing the biomass plastic degree. It is possible to provide a container to which such a cap is attached, a container with a cap including such a cap, and a container containing contents.

Brief Description of the Drawings

[0022] [Figure 1] It is a front view of the container with a cap. [Figure 2](A) is a top view of the container with a cap. (B) is a bottom view of the container with a cap. [Figure 3] This is a diagram showing a disassembled longitudinal cross-section of a container with a cap. [Figure 4] This is a cross-sectional view showing the inner stopper attached to the top lid. [Figure 5] This is a perspective view showing the stopper body and the inner stopper that is inserted into the opening of the stopper body. [Figure 6] This is a cross-section of the cap. [Figure 7] This is a cross-sectional view of the opening of the container. [Modes for carrying out the invention]

[0023] Embodiments of this disclosure will be described below, with reference to the drawings as appropriate. However, the following embodiments are illustrative examples for illustrating this disclosure and are not intended to limit this disclosure to the following. In the description, the same reference numerals will be used for identical elements or elements having the same function, and redundant explanations will be omitted as appropriate. Furthermore, unless otherwise specified, positional relationships such as up, down, left, and right will be based on the orientation of the reference numerals shown in the drawings. Moreover, the dimensional ratios of each element are not limited to those shown.

[0024] A cap according to one embodiment comprises a polyolefin stopper body that is attached to the mouth of a container and has a discharge port for discharging the contents contained in the container; a polyolefin inner stopper having an insertion portion that is inserted into the discharge port of the stopper body, with the insertion portion in close contact with the inner circumferential surface of the discharge port to seal the discharge port; and a polyolefin top lid that holds the inner stopper and is configured to be detachably attached to the stopper body together with the inner stopper. The biomass plasticity Bi (hereinafter simply referred to as "Bi") of the inner stopper is lower than the biomass plasticity Bo (hereinafter simply referred to as "Bo") of the top lid. That is, Bo > Bi.

[0025] The relationship between the biomass plastic content Bm (hereinafter simply referred to as "Bm") of the stopper body and Bi may be Bm ≥ Bi, or Bm > Bi. By sufficiently lowering Bi, the opening torque can be sufficiently reduced. Furthermore, by increasing Bm, the biomass plastic content of the entire cap can be further increased.

[0026] From the viewpoint of reducing the capping strength measured when sealing a container with a stopper, Bo > Bm is acceptable. Examples of the relative magnitudes of Bo, Bm, and Bi are Bo > Bm ≥ Bi and Bo > Bm > Bi. In another example, Bo > Bi > Bm is acceptable.

[0027] From the viewpoint of increasing the biomass plastic content of the entire cap, Bo may be 15% or more, 20% or more, 30% or more, more than 30%, or 35% or more. From the viewpoint of sufficiently reducing the capping strength, the upper limit of Bo may be 80%, 60%, or 50%.

[0028] From the viewpoint of sufficiently stabilizing the opening torque of the cap, Bi may be less than 5%, less than 1%, or even 0%. From the viewpoint of increasing the biomass plastic content of the entire cap, Bm may be 5% or more, or 10% or more. On the other hand, in the case of a press-fit cap, from the viewpoint of reducing the press-fit strength, Bm may be less than 15%, less than 10%, less than 5%, or even 0%.

[0029] In this specification, biomass plasticity refers to the ratio of the mass of biomass-derived components to the total mass of a cap, a capped container, or each component comprising them. Biomass plasticity is measured according to ASTM D6866 for radiocarbon in the plastic. 14 The concentration of C) is used to calculate the following formula (A). Biomass plastic content (%) = 14 C concentration (pMC)×0.935 (A)

[0030] The biomass plastic content can be adjusted by changing the proportion of biomass-derived plastics (plastics derived from plants, etc.) among the plastics used as materials. Examples of biomass plastics include biomass-derived low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and polyethylene terephthalate. These are available commercially (for example, from Blaschem or Indorama). When biomass-derived low-density polyethylene, linear low-density polyethylene, high-density polyethylene, and polyethylene terephthalate are included, the amount of each resin derived from fossil fuels is reduced, thus reducing the environmental impact.

[0031] From the viewpoint of increasing the biomass plastic content of the entire cap, the ratio of the mass of the top lid to the mass of the inner stopper may be 5 or more, 10 or more, or 20 or more. The upper limit of this ratio may be, for example, 50.

[0032] From the viewpoint of increasing the biomass plastic content of the entire cap, the ratio of the mass of the top lid to the total mass of the cap may be 0.5 or more, and may also be 0.55 or more. The upper limit of this ratio may be, for example, 0.9.

[0033] The top lid, stopper body, and inner stopper may all contain polyolefin. The top lid may contain block polypropylene and biomass-derived polyethylene from the viewpoint of improving impact resistance while increasing Bo. The block polypropylene may be homopolypropylene in which ethylene propylene rubber (EPR), a rubber component, is dispersed. The block polypropylene may be fossil fuel-derived block polypropylene, biomass-derived block polypropylene, or a mixture thereof. From the viewpoint of sufficiently increasing impact resistance, the content of block polypropylene in the top lid may be, for example, 20% by mass or more, 30% by mass or more, or 40% by mass or more. From the viewpoint of sufficiently increasing Bo, the content of block polypropylene in the top lid may be, for example, 85% by mass or less, 80% by mass or less, or 70% by mass or less.

[0034] The density of the block polypropylene contained in the lid is 0.88-0.92 g / cm³. 3 It is acceptable for it to be 0.89-0.91 g / cm³. 3 The melt flow rate (MFR) of block polypropylene may be 5 to 18 [g / 10 min], 6 to 14 [g / 10 min], or 7 to 12 [g / 10 min]. The melt flow rate (MFR) as used herein is measured in accordance with JIS K 7210 at a temperature of 190°C and a load of 2.16 kg.

[0035] The flexural modulus of the block polypropylene contained in the top lid may be 800 to 1300 MPa, 900 to 1200 MPa, or 950 to 1100 MPa. The flexural modulus of the block polypropylene can be measured in accordance with JIS K 6922-2:1998 or ASTM D790.

[0036] From the perspective of increasing Bo, the content of biomass-derived high-density polyethylene in the upper lid may be 15% by mass or more, may be 20% by mass or more, or may be 30% by mass or more. From the perspective of sufficiently reducing the plugging strength, the content of biomass-derived high-density polyethylene in the upper lid may be 80% by mass or less, may be 70% by mass or less, or may be 60% by mass or less.

[0037] The density of the biomass-derived high-density polyethylene contained in the upper lid may be 0.92 to 0.99 g / cm 3 and may also be 0.94 to 0.98 g / cm 3 The density of the biomass-derived high-density polyethylene can be measured in accordance with ASTM D 792 or JIS K6922-2:1998. The melt flow rate (MFR) of the biomass-derived high-density polyethylene contained in the upper lid may be 4 to 12 [g / 10 min], may be 5 to 10 [g / 10 min], or may be 6 to 8 [g / 10 min]. The flexural modulus of the biomass-derived high-density polyethylene contained in the upper lid may be 900 to 1600 MPa, may be 1100 to 1500 MPa, or may be 1200 to 1400 MPa. The flexural modulus of the biomass-derived high-density polyethylene resin can be measured in accordance with ASTM D2240 or JIS K6922-2:1998.

[0038] From the perspective of improving the sealing property and sufficiently suppressing the leakage of the contained substance, and from the perspective of reducing the plugging strength when plugging the container in the case of a plug-type plug body, the plug body may contain linear low-density polyethylene. The content of linear low-density polyethylene in the plug body may be 60% by mass or more, may be 70% by mass or more, may be 80% by mass or more, or may be 90% by mass or more.

[0039] The density of the linear low-density polyethylene contained in the plug body may be less than 0.942 g / cm 3 and may be 0.800 to 0.940 g / cm 3 and may be 0.840 to 0.935 g / cm 3It is acceptable for it to be 0.890~0.930 g / cm³ 3 It is acceptable for it to be 0.910~0.925 g / cm³. 3 This may be the case. The density of linear low-density polyethylene can be measured in accordance with ASTM D1505 or JIS K6922-2:1998.

[0040] The flexural modulus of the linear low-density polyethylene contained in the stopper body may be 30 to 700 MPa, 80 to 500 MPa, 150 to 400 MPa, or 200 to 350 MPa, from the viewpoint of providing a suitable range for stopper strength. The flexural modulus of the linear low-density polyethylene resin can be measured in accordance with JIS K 6922-2:1998 or ASTM D790.

[0041] The stopper body may contain biomass-derived high-density polyethylene from the viewpoint of reducing the sealing strength. The content of biomass-derived polyethylene in the stopper body may be 5% by mass or more, 10% by mass or more, or 15% by mass or more from the viewpoint of increasing Bm. From the viewpoint of sufficiently reducing the sealing strength, the content of biomass-derived polyethylene in the stopper body may be 15% by mass or less, 10% by mass or less, or 5% by mass or less. The stopper body does not have to contain biomass-derived plastic.

[0042] The density of the biomass-derived high-density polyethylene contained in the stopper body is 0.91-0.99 g / cm³. 3 It is acceptable for it to be 0.93-0.98 g / cm³. 3 The melt flow rate (MFR) of the biomass-derived polyethylene contained in the stopper body may be 10-30 [g / 10min] or 15-25 [g / 10min]. The flexural modulus of the biomass-derived high-density polyethylene contained in the stopper body may be 800-1500 MPa, 1000-1400 MPa or 1100-1350 MPa.

[0043] The inner stopper has an insertion portion that is inserted into the discharge port, and since this insertion portion has the function of sealing the discharge port when inserted, it may contain high-density polyethylene. The content of high-density polyethylene in the entire inner stopper may be 60% by mass or more, 80% by mass or more, or 90% by mass or more. The inner stopper may contain a slip agent or a component derived therefrom from the viewpoint of smooth molding. The stopper body does not have to contain biomass-derived plastic from the viewpoint of reducing the stopper strength.

[0044] The high-density polyethylene contained in the inner stopper may be either a homopolymer of ethylene or a copolymer of ethylene and an olefin compound, or it may contain both. The density of the high-density polyethylene contained in the inner stopper is 0.942 g / cm³. 3 The above is acceptable, and the range is 0.948 to 0.970 g / cm³. 3 It is acceptable for it to be 0.952~0.965 g / cm³. 3 This may be the case. The density of high-density polyethylene can be measured in accordance with ASTM D 792 or JIS K6922-2:1998.

[0045] Examples of the olefin compounds mentioned above include α-olefins such as 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. The content of structural units derived from olefin compounds in the high-density polyethylene resin may be 15% by mass or less, 10% by mass or less, or 1 to 8% by mass.

[0046] The melt flow rate (MFR) of the high-density polyethylene contained in the inner stopper may be 6 to 20 [g / 10min], 8 to 18 [g / 10min], or 10 to 14 [g / 10min].

[0047] The flexural modulus of high-density polyethylene may be 800 MPa or higher, 900 MPa or higher, or 950 MPa or higher. The flexural modulus of high-density polyethylene resin can be measured in accordance with ASTM D2240 or JIS K6922-2:1998. The upper limit of the flexural modulus of high-density polyethylene may be, for example, 1400 MPa.

[0048] A container according to one embodiment has an opening to which the above-described cap is attached. The cap may be fitted by pressing it into the opening. The container may be made of plastic. The container may contain biomass plastic, for example, biomass-derived polyethylene terephthalate (PET). The biomass plastic content Bc (hereinafter simply referred to as "Bc") of the container may be 10% or more, or 20% or more. Bc may be 50% or less, or 40% or less. The container may be a capped container.

[0049] The density of biomass-derived polyethylene terephthalate (PET) contained in the container is 1.3-1.5 g / cm³. 3 It may be as follows. The density of biomass-derived PET can be measured in accordance with ASTM D 792. The flexural modulus of biomass-derived PET contained in the container may be 1.7 to 3 GPa, or 2 to 2.8 GPa. The flexural modulus of biomass-derived PET can be measured in accordance with ASTM D 790.

[0050] A capped container according to one embodiment comprises the above-described container and the above-described cap fitted (sealed) to the mouth of the container. By including biomass-derived plastic in both the cap and the container of this capped container, the biomass plastic content of the entire capped container can be made sufficiently high. The biomass plastic content of the entire capped container may be, for example, 15% or more, 20% or more, or 25% or more. There is no particular upper limit to the biomass plastic content of the entire capped container; for example, it may be 40% or 30%.

[0051] A container containing a substance according to one embodiment comprises a capped container and a substance contained in the container section of the capped container. The substance is not particularly limited and can take various forms, such as powdered solids, liquids, or viscous substances. Specifically, it can take the form of food, seasonings, or beverages. The substance may contain oil. Since the cap of the container containing a substance in this embodiment can maintain its opening torque, leakage can be sufficiently suppressed even if the substance contains oil. The substance may be, for example, salad dressing.

[0052] An example of a capped container 100 shown in Figures 1 and 2 comprises a container 60 and a cap 50 fitted to the mouth of the container 60. The capped container 100 may contain contents and be used as a container for contents. When opening a container for contents, the user grasps the container 60 with one hand and the top lid 30 of the cap 50 with the other hand. Then, when viewed from above as shown in Figure 2(A), the top lid 30 is rotated counterclockwise relative to the container 60 to open the container for contents (capped container 100). The surface of the top lid 30 may have knurling to prevent slipping.

[0053] After opening, some or all of the contents are dispensed from the container. Then, if necessary, the top lid 30 is rotated clockwise around the container 60 to close the container (capped container 100). When the contents are to be used in multiple portions, the container (capped container 100) will be opened and closed repeatedly. For this reason, it is preferable to maintain the opening torque (opening torque) within a predetermined range, while maintaining ease of opening and suppressing leakage of the contents. Even when the contents are to be used all at once, it is naturally preferable to maintain the opening torque (opening torque) within a predetermined range.

[0054] As shown in Figure 3, the capped container 100 comprises a container 60 having a storage section for storing contents, and a cap 50 that is fitted onto the mouth 61 of the container 60 by being pressed in. Both the cap 50 and the container 60 are made of plastic. The cap 50 comprises a stopper body 10 that is pressed into the mouth 61 of the container 60, an inner stopper 20, and an upper lid 30. The materials of the stopper body 10, inner stopper 20, upper lid 30, and container 60 are as described above. The stopper body 10, inner stopper 20, upper lid 30, and container 60 can be manufactured by preparing pellets of each plastic and using known molding methods such as injection molding and blow molding.

[0055] As shown in Figure 4, the inner stopper 20 is attached to the top cover 30. The top cover 30 has a first circumferential wall portion 31 that forms the exterior of the cap 50. Knurling may be formed on the surface of the first circumferential wall portion 31. Inside the top cover 30, a second circumferential wall portion 32, a third circumferential wall portion 33, and a fourth circumferential wall portion 34 are arranged concentrically in this order from the first circumferential wall portion 31 toward the center of the top cover 30. A female thread 33a is formed on the inner surface of the third circumferential wall portion 33. This female thread 33a is screwed into a male thread 13 formed on the surface of the stopper body 10 shown in Figure 5, thereby fixing the stopper body 10 and the top cover 30 to each other. At this time, the tip 32A of the second circumferential wall portion 32 abuts against the flange body 12 of the stopper body 10 shown in Figure 5. In this way, the second circumferential wall portion 32 has the function of reinforcing the strength of the top cover 30.

[0056] Returning to Figure 4, the fourth circumferential wall portion 34 forms a retaining portion 36 that holds the inner plug 20. The fourth circumferential wall portion 34 has a projection 35 at its tip that protrudes toward the center of the top lid 30. This projection 35 abuts against the flange portion 25 of the inner plug 20, which extends outward from the insertion portion 22. That is, the inner diameter of the projection 35 is smaller than the outer diameter of the flange portion 25. Therefore, the inner plug 20 is held in the retaining portion 36 provided inside the top lid 30 by the abutment between the flange portion 25 and the projection 35. The fourth circumferential wall portion 34 that forms the retaining portion 36 may have a deformable thickness and be made of an elastically deformable material. This allows the inner plug 20 to be fitted into the retaining portion 36 after the inner plug 20 and the top lid 30 have been molded separately.

[0057] The insertion portion 22 is composed of a peripheral wall and has a cavity 22A in the center. The presence of the cavity 22A makes the insertion portion 22 easily deformable to reduce its outer diameter. This allows the inner plug 20 to be smoothly fitted and attached to the retaining portion 36. The inner plug 20, attached to the retaining portion 36 of the top cover 30, is removed from the plug body 10 together with the top cover 30 and attached to the plug body 10 together with the top cover 30. In other words, the inner plug 20 is attached to and detached from the plug body 10 as an integral part of the top cover 30.

[0058] In Figure 5, for illustrative purposes, the top cover 30 to which the inner plug 20 is attached is omitted, and the discharge port 14 of the plug body 10 and the insertion portion 22 of the inner plug 20 that is inserted into the discharge port 14 are shown. The inner plug 20 has an insertion portion 22 and a flange portion 25 on the base end side of the insertion portion 22, which has a larger outer diameter than the insertion portion 22. The flange portion 25 has the function of covering the discharge port 14 when the insertion portion 22 is inserted into the discharge port 14, and sealing the discharge port 14 together with the insertion portion 22.

[0059] The inner circumferential surface 14A forming the discharge port 14 is a smooth surface. The plug body 10 has a male screw 13 and a flange portion 15 extending downward from the discharge port 14. The flange portion 15 has an outer edge portion 11 at its lower end that extends outward from the center. When the top cover 30 is attached to the plug body 10, the tip 31A of the first circumferential wall portion 31 abuts against the outer edge portion 11. The outer edge portion 11 may have a band structure that allows it to be detached from the flange portion 15 for separate collection.

[0060] Referring to Figures 4 and 5, the procedure for attaching the top cover 30 to the stopper body 10 and closing it will be explained. The top cover 30 is placed over the stopper body 10 so that the insertion portion 22 and the discharge port 14 face each other. When the top cover 30 is placed so that the centerlines of the top cover 30 and the stopper body 10 coincide, the female thread 33a of the third peripheral wall portion 33 of the top cover 30 and the male thread 13 of the stopper body 10 come into contact. When the top cover 30 is rotated clockwise in a plan view relative to the stopper body 10, the female thread 33a of the top cover 30 and the male thread 13 of the stopper body 10 are screwed together. If the clockwise rotation of the top cover 30 continues, the top cover 30 will gradually move along the axis of rotation toward the stopper body 10. As this movement occurs, the insertion portion 22 of the inner stopper 20 is inserted into the discharge port 14.

[0061] The insertion portion 22 inserted into the discharge port 14 is gradually inserted as the top cover 30 approaches the plug body 10. At this time, the inner plug 20 is pressed toward the discharge port 14 by the upper surface 36A (ceiling surface) of the holding portion 36 on the top cover 30 and inserted into the discharge port 14. At this time, the inner plug 20 may be inserted into the discharge port 14 while rotating clockwise together with the top cover 30. In this case, the insertion portion 22 is inserted into the discharge port 14 while the outer circumferential surface 24 of the insertion portion 22 and the inner circumferential surface 14A of the discharge port 14 slide in the direction of rotation and in the direction of rotation axis.

[0062] The mounting is completed when the tip 31A of the first circumferential wall portion 31 and the tip 33A of the second circumferential wall portion 32 of the top cover 30 come into contact with the flange body 12 and outer edge 11 of the flange portion 15 of the stopper body 10, respectively. In this way, the second circumferential wall portion 32, together with the first circumferential wall portion 31, has the function of preventing the top cover 30 from being overtightened. In this manner, the top cover 30, with the inner stopper 20 held by the holding portion 36, can be attached to the stopper body 10 to close the cap 50.

[0063] When the insertion portion 22 is inserted into the discharge port 14, the outer circumferential surface 24 of the insertion portion 22 and the inner circumferential surface 14A of the discharge port 14 do not necessarily have to slide in the rotational direction. In this case, the outer circumferential surface 24 of the insertion portion 22 and the inner circumferential surface 14A of the discharge port 14 slide in the direction of the rotation axis, and the insertion portion 22 is inserted into the discharge port 14. Then, the upper surface 36A of the holding portion 36 of the top cover 30 and the upper surface 25A of the flange portion 25 slide in the rotational direction. In this way, the inner plug 20 has a sliding surface that slides along the rotational direction with at least one of the top cover 30 and the plug body 10 when the top cover 30 is attached to the plug body 10. The material of this sliding surface affects the amount of rotational torque required to attach the top cover 30 to the plug body 10.

[0064] Figure 6 shows a cross-section of the top cover 30 attached to the stopper body 10. The insertion portion 22 of the inner stopper 20 is inserted into the discharge port of the stopper body 10, and the discharge port is sealed. The outer peripheral surface 24 of the insertion portion 22 is in close contact with the inner peripheral surface 14A of the discharge port, sealing the discharge port.

[0065] The procedure for opening the cap 50 will be explained with reference to Figures 6 and 5. When the top cover 30 is rotated counterclockwise in a plan view relative to the stopper body 10, the top cover 30 gradually moves along the axis of rotation so that it separates from the stopper body 10 due to the action of the female thread 33a of the top cover 30 and the male thread 13 of the stopper body 10, which are screwed together.

[0066] The insertion portion 22, which was inserted into the discharge port 14, is gradually withdrawn as the top cover 30 separates from the plug body 10. At this time, the flange portion 25 of the inner plug 20 abuts against the protrusion 35 at the tip of the fourth circumferential wall portion 34 that forms the holding portion 36 on the top cover 30. The inner plug 20 may rotate counterclockwise together with the top cover 30 as the insertion portion 22 is withdrawn from the discharge port 14. In this case, the outer circumferential surface 24 of the insertion portion 22 and the inner circumferential surface 14A of the discharge port 14 slide in the direction of rotation and in the direction of rotation axis as the insertion portion 22 is withdrawn from the discharge port 14.

[0067] In this way, the top cover 30 is removed from the stopper body 10 while the inner stopper 20 is held in place by the retaining part 36. When the insertion part 22 is removed from the discharge port 14, the outer circumferential surface 24 of the insertion part 22 and the inner circumferential surface 14A of the discharge port 14 may not slide along the rotational direction, but only along the rotational axis direction. In this case, the protrusion 35 of the fourth circumferential wall 34 of the retaining part 36 of the top cover 30 and the tip of the flange part 25 slide along the rotational direction. Thus, when opening the cap 50, the inner stopper 20 has a sliding surface that slides along the rotational direction with at least one of the top cover 30 and the stopper body 10. The material of this sliding surface affects the amount of torque required to open the cap 50 (opening torque).

[0068] In the cap 50, the top lid 30 and the inner stopper 20 are not constructed as a single component, but rather as separate components. Therefore, the top lid 30 and the inner stopper 20 can be made of different materials. By making the Bi of the inner stopper 20 smaller than the Bo of the top lid 30, the reduction in frictional force on the sliding surface can be suppressed. This effectively prevents the cap 50 from opening unintentionally or the contents from leaking. The maximum opening torque may be, for example, 60 to 80 Nm. Furthermore, by lowering or eliminating the Bi of the inner stopper 20, and instead increasing the Bo of the top lid 30 and the Bm of the stopper body 10, the overall biomass plastic content of the cap 50 can be increased.

[0069] Next, the procedure for attaching the cap 50 to the mouth 61 of the container 60 will be described with reference to Figures 3, 6, and 7. Position the cap 50 and the container 60 so that the lower end of the stopper body 10 of the cap 50 faces the mouth 61 of the container 60. Align the cap 50 and the container 60 so that the center line of the cap 50 coincides with the center line of the container 60. The mouth 61 of the container 60 has a first projection 61B and a second projection 61C that protrude outward around its entire circumference. A recess 61A is formed between the first projection 61B and the second projection 61C. The mouth 61 of the container 60 and the groove 17 of the stopper body 10 that is inserted into this mouth 61 have complementary shapes. In addition, the first projection 61B and the recess 61A have complementary shapes to the projection 17A in the groove 17 of the stopper body 10.

[0070] After alignment, the cap 50 and the container 60 are biased in opposing directions. This causes the projection 17A at the entrance of the groove 17 formed on the inside of the outer edge 11 of the stopper body 10 to overcome the first projection 61B on the mouth 61 and fit into the recess 61A. As a result, the first projection 61B is inserted into and fixed in the groove 17. In this way, the mouth 61 of the container 60 is fitted into the groove 17 of the stopper body 10, and a capped container 100 with the cap 50 pressed into the container 60 can be obtained. The capping strength required is thought to vary depending on the flexibility and frictional force of the outer edge 11 of the stopper body 10, which elastically deforms during capping.

[0071] The biomass plastic content Bm of the stopper body 10 may be lower than the biomass plastic content Bo of the top lid 30. This allows for a higher biomass plastic content in the top lid 30 while making the stopper body 10 more flexible and reducing friction, thereby lowering the capping strength required when sealing the cap 50 (stopper body 10) onto the container 60. By introducing the contents into the container 60 before capping, and then capping, a container with contents can be obtained.

[0072] By lowering or eliminating the Bi of the inner stopper 20 and the Bm of the stopper body 10, and instead increasing the Bo of the top lid 30, the biomass plastic content of the entire cap 50 can be increased while maintaining the opening torque and lowering the sealing strength.

[0073] The stopper body 10 of the cap 50 may have a notch for separating the outer edge 11 from the flange body 12. That is, the outer edge 11 may be a band member that can be separated from the flange body 12. After the user has used the container containing the contents, the stopper body 10 (cap 50) can be removed from the container 60 by separating the outer edge 11, which is made of a band member, from the flange body 12. This facilitates separate collection for disposal.

[0074] Although embodiments of the present disclosure have been described above, the present disclosure is not limited in any way to the embodiments described above. For example, the cap is not limited to a press-fit type, but may be a screw-fastened type. Also, the cap may include components other than the top cover, the stopper body, and the inner stopper.

[0075] This disclosure includes the following [1] to

[14] : [1] A stopper body made of polyolefin, which is attached to the mouth of a container and has a discharge port for discharging the contents contained in the container, An inner stopper made of polyolefin having an insertion portion that is inserted into the discharge port, the insertion portion of which adheres tightly to the inner circumferential surface of the discharge port to seal the discharge port, The system includes a polyolefin top cover that holds the inner stopper and is detachably attached to the stopper body together with the inner stopper, A cap in which the biomass plastic content Bi of the inner stopper is lower than the biomass plastic content Bo of the upper lid. [2] The cap according to [1], wherein when attaching or detaching the top cover to the stopper body, the surface of the inner stopper and at least one of the holding portion that holds the inner stopper and the inner circumferential surface of the discharge port slide against each other. [3] The cap according to [1] or [2], wherein the stopper body and the top cover are fixed to each other by screwing together a male thread provided on the stopper body and a female thread provided on the top cover. [4] The stopper body is fitted onto the mouth of the container by being pressed into place, A cap according to any one of [1] to [3], wherein the biomass plastic content Bm of the stopper body is lower than the biomass plastic content Bo of the top lid. [5] A cap according to any one of [1] to [4], wherein the biomass plastic degree Bo of the top lid satisfies the following formula (1). Bo > 30% (1) [6] A cap according to any one of [1] to [5], wherein the biomass plasticity Bi of the inner stopper and the biomass plasticity Bm of the stopper body satisfy the following formula (2). 10% > Bm ≥ Bi (2) [7] The top lid comprises biomass-derived polyethylene and block polypropylene, The stopper body contains linear low-density polyethylene resin, The cap according to any one of [1] to [6], wherein the inner stopper comprises high-density polyethylene resin. [8] A cap according to any one of [1] to [7], wherein the ratio of the mass of the top lid to the mass of the inner stopper is 5 or more. [9] A cap according to any one of [1] to [8], wherein the ratio of the mass of the top lid to the total mass of the cap is 0.5 or more.

[10] A container having the mouth portion to which the cap described in any one of [1] to [9] above is attached, A container in which the biomass plastic content Bc of the container is greater than the biomass plastic content Bi of the inner stopper.

[11] The container according to

[10] , comprising polyethylene terephthalate derived from biomass.

[12] A capped container comprising a cap described in any one of [1] to [9] above, and a container having the mouth portion to which the cap is attached.

[13] The capped container according to

[12] , the container comprising polyethylene terephthalate derived from biomass.

[14] A container for contents, comprising a capped container as described in

[12] or

[13] above, and contents contained in the capped container. [Examples]

[0076] The contents of this disclosure will be described in more detail with reference to examples and comparative examples, but this disclosure is not limited to the following examples.

[0077] (Comparative Examples 1, 2, Examples 1-4) <Preparation of raw materials> The following ingredients were prepared. (A) Fossil fuel-derived block polypropylene (PP) Manufactured by Sun Allomer Co., Ltd., product name "PM761A", density: 0.90 g / cm³ 3 MFR: 9.5g / 10min, flexural modulus: 1050MPa (B) Fossil fuel-derived high-density polyethylene (HDPE-F) Manufactured by Nippon Polyethylene Co., Ltd., product name "HJ580", density: 0.96 g / cm³ 3 MFR: 12.0g / 10min, flexural modulus: 1000MPa (C) Biomass-derived high-density polyethylene (HDPE-B1) Manufactured by Braskem, product name "SHC7260", biomass plastic content: 94% or higher, density: 0.959 g / cm³ 3 MFR: 7.2g / 10min, flexural modulus: 1365MPa (D) Biomass-derived high-density polyethylene (HDPE-B2) Manufactured by Braskem, product name "SHA7260", biomass plastic content: 94% or higher, density: 0.955 g / cm³ 3 MRF: 20g / 10min, flexural modulus: 1250MPa (E) Linear low-density polyethylene (LLDPE) derived from fossil fuels LOTTE CHEMICAL Co., Ltd., product name "UL814", density: 0.924 g / cm³ 3 MFR: 20g / 10min, flexural modulus: 304MPa (F) Biomass-derived polyethylene terephthalate (PET) Indorama Corporation, product name "RAMPET N1B", biomass plastic content: 30% or more, intrinsic viscosity: 0.8 dl / g (G) Coloring agent (red) Manufactured by Dainichi Seika Kogyo Co., Ltd., product name "14Q3408RD-SE" (H) Coloring agent (white) Manufactured by Toyo Ink Manufacturing Co., Ltd., product name "TET 1YA550WHT" (I) Slip agent (S) Manufactured by Sumitomo Chemical Co., Ltd., product name "A-10"

[0078] The above-mentioned raw materials (A) to (E) and (G) to (I) were mixed in the proportions (unit: mass%) shown in Table 1 to obtain the mixed raw materials for the top lid, the mixed raw materials for the inner stopper, and the mixed raw materials for the stopper body.

[0079] <Shaping the top lid> A resin composition was prepared by melting and kneading the mixed raw materials for the top lid at 240°C for 20 seconds using an injection molding machine. This resin composition was placed into an injection molding machine (FANUC Corporation, product name "α-S150iA"), and injection molding was performed using a mold at 240°C for 20 seconds to obtain a top lid having a shape similar to the top lid 30 shown in Figure 3. The outer diameter of the top lid was approximately 37 mm, and its mass was approximately 5.4 g.

[0080] <Molding of the inner plug> The mixed raw materials for the inner plug were melt-kneaded at 220°C for 20 seconds using an injection molding machine to prepare a resin composition. This resin composition was placed into an injection molding machine (FANUC Corporation, product name "α-S150iA"), and injection molding was performed using a mold at 220°C for 20 seconds to obtain an inner plug having a shape similar to the inner plug 20 shown in Figure 3. The outer diameter of the flange portion of the inner plug was approximately 11.7 mm, and its mass was approximately 0.2 g.

[0081] <Shaping of the stopper body> A resin composition was prepared by melt-kneading the mixed raw materials for the stopper body at 220°C for 23 seconds using an injection molding machine. This resin composition was put into an injection molding machine (FANUC Corporation, product name "α-S150iA"), and injection molding was performed using a mold at 220°C for 23 seconds to obtain a stopper body having the same shape as the stopper body 10 shown in Figure 3. The inner diameter of the discharge port of the stopper body was approximately 6.5 mm, the inner diameter of the outer edge was approximately 28 mm, and the mass was approximately 3.7 g.

[0082] <Container molding> The raw material (F) was melt-kneaded at 270°C for 18 seconds and then fed into a stretchable PET molding machine (manufactured by Nissei ASB Machinery Co., Ltd., model: PF8-4B). Using a mold, injection molding and blow molding were performed at 270°C for 18 seconds to obtain a container having a shape similar to container 60 shown in Figure 3. The mass of the container was approximately 17g.

[0083] <Biomass plastic content of each component and cap> The biomass plastic content (Bo, Bi, Bm, Bc) of the top lid, inner stopper, stopper body, and container was calculated based on the mixing ratio of the raw materials and the biomass plastic content of the raw materials. Note that Bo, Bi, Bm, and Bc are calculated values ​​based on the minimum guaranteed biomass plastic content of the raw materials. Furthermore, the biomass plastic content (Ba) of the entire cap (labeled "Cap" in Table 2) was calculated from the mass of the top lid, inner stopper, and stopper body, and their respective biomass plastic content (Bo, Bi, Bm). These results are shown in Table 2.

[0084] <Making the cap> Using the fabricated top lid, inner stopper, and stopper body, caps for Comparative Examples 1 and 2 and Examples 1 to 4 were manufactured, having the cross-sectional structure shown in Figure 6. The procedure involved fitting the inner stopper into the retaining part of the top lid, and then attaching the top lid with the inner stopper to the stopper body by screwing the female thread of the top lid with the male thread of the stopper body.

[0085] <Measurement of opening torque> The cap was fixed to the measuring stand of a commercially available torque meter (manufactured by Imada Co., Ltd., product name: DTXA-2N-Z) using a fixing jig. A metal cap-opening jig, having a surface shape complementary to the knurling formed on the surface of the cap, was placed over the cap's top cover. The operator grasped the cap-opening jig and rotated it counterclockwise in a plan view to measure the torque required to open the cap. In the torque measurement curve, the first largest peak that appeared from the start of opening the cap was defined as the primary cap-opening torque, and the second largest peak that appeared when the cap was rotated approximately 80° from the starting point (0°) was defined as the secondary cap-opening torque. The results are shown in Table 2.

[0086] <Measurement of plugging strength> A commercially available compression tester (Shimadzu Corporation, product name: Autograph AGS-X 5kN) was used to measure the capping strength. The prepared container was fixed using a fixing jig so that the opening of the mouth faced upwards. A cap was placed on the upper end of the mouth, and a pressing jig was placed over the cap. Using the above compression tester, the cap was pushed towards the bottle through the pressing jig, and the force required for capping was measured until capping was complete. The maximum value of the measured force (N) was defined as the capping strength. The descent speed was 10 mm / min, and the strain in the compression direction was set to 3 mm strain. After capping, a container with a cap as shown in Figure 1 was obtained. The results of the capping strength are shown in Table 2.

[0087] <Leakage test> After pouring salad oil into a container, a cap was applied to create a container containing the contents. This container was then placed in a vacuum pack and stored in a 45°C constant temperature bath for 15 hours with the container lying on its side. After that, the vacuum pack was removed from the constant temperature bath, and the container was visually inspected for any leakage of salad oil. Leaks were rated as "yes" and those without leaks were rated as "no". The results are shown in Table 2.

[0088] [Table 1]

[0089] [Table 2]

[0090] In Table 1, the total value of the raw materials for each component deviates slightly from 100%, which is due to rounding. As shown in the raw materials in Table 1 and the "Biomass Plasticity" column in Table 2, Comparative Example 1 is a cap that does not use biomass-derived plastic. In contrast, Comparative Example 2 is a cap made using 16-17% by mass of biomass-derived plastic uniformly for the top lid, inner stopper, and stopper body. As shown in the "Evaluation Results" in Table 2, the cap of Comparative Example 2 showed a significant decrease in both primary and secondary opening torque compared to the cap of Comparative Example 1. In particular, the decrease in primary opening torque raises concerns that the cap may open unintentionally. In addition, the capping strength of Comparative Example 2 was significantly higher than that of Comparative Example 1.

[0091] One possible reason for the decreased opening torque in Comparative Example 2 is that the higher biomass plastic content reduced the frictional force between the sliding plastic components. Another possible reason is that although Comparative Examples 1 and 2 were manufactured using the same manufacturing equipment, the inclusion of biomass-derived plastic may have caused subtle changes in size and shape after molding. For reference, Table 3 shows the results of measuring the dimensions of each component in Comparative Example 1 and Comparative Example 2. As shown in Table 3, slight dimensional differences are observed, but these are considered to be within the margin of error.

[0092] Therefore, in Example 1, a cap was fabricated using only the inner stopper from Comparative Example 1, and the top lid and stopper body from Comparative Example 2. As a result, the cap of Example 1 was able to significantly restore the opening torque (primary). From this, it was confirmed that the biomass plastic content of the inner stopper greatly affects the opening torque (primary).

[0093] In Example 2, the inner stopper was the same as in Comparative Example 1, as in Example 1. However, in Example 2, Bo was increased compared to Example 1 in order to increase the overall Ba of the cap. As a result, the opening torque (primary) was significantly higher than in Comparative Example 2, as in Example 1. From this result, it can be concluded that Bo does not have much effect on the opening torque (primary). On the other hand, the capping strength was considerably higher than in Comparative Example 1, as in Comparative Example 2.

[0094] In Example 3, the inner stopper was the same as in Examples 1 and 2, as in Comparative Example 1. In Example 3, Bo was made even higher than in Example 2, while Bm was made lower than in Example 2. As a result, the opening torque (primary) was significantly higher than in Comparative Example 2, as in Examples 1 and 2, and the capping strength was made lower than in Example 2.

[0095] In Example 4, the Bo value was further increased while maintaining the overall biomass plastic content Ba of the cap at the same level as in Examples 2 and 3, while using the same inner stopper and stopper body as in Comparative Example 1. As a result, the capping strength was brought closer to that of Comparative Example 1. From these results, it was confirmed that although the capping strength tends to increase with increasing biomass plastic content, the capping strength can be reduced by decreasing the Bm value of the stopper body.

[0096] From the results of Comparative Examples 1 and 2 and Examples 1 to 4, it was confirmed that when increasing the biomass plasticity using biomass-derived plastics, by lowering the Bi of the inner stopper to a lower level than the Bo of the top lid, it is possible to manufacture a cap that can stably maintain the opening torque (primary) within the same range as conventional caps, while using the same molding equipment (mold) as conventional caps.

[0097] [Table 3]

[0098] As shown in Table 3, since the same mold and molding apparatus were used in all comparative examples and examples, there were no significant differences in the mass and size of the components. Table 3 shows the mass ratio of the top lid to the inner stopper, and the mass ratio of the top lid to the entire cap. Because the mass of the top lid is larger than that of the other components, increasing Bo can increase the Ba of the entire cap. [Industrial applicability]

[0099] It is possible to provide a cap that maintains the opening torque while increasing the biomass plastic content. It is also possible to provide a container to which such a cap can be attached, a capped container equipped with such a cap, and a container containing its contents. [Explanation of Symbols]

[0100] 10...Stopper body, 11...Outer edge, 12...Flange body, 13...Male thread, 14...Discharge port, 14A...Inner circumferential surface, 15,25...Flange part, 17...Groove part, 17A...Protrusion, 20...Inner stopper, 22...Insertion part, 22A...Cavity part, 24...Outer circumferential surface, 25A...Top surface, 30...Top lid, 31...First circumferential wall part, 31A,32A,33A...Tip, 32...Second circumferential wall part, 33...Third circumferential wall part, 33a...Female thread, 34...Fourth circumferential wall part, 35...Convex part, 36...Holding part, 36A...Top surface, 50...Cap, 60...Container, 61...Mouth part, 61A...Concave part, 61B...First projection part, 61C...Second projection part, 100...Container with cap.

Claims

1. A stopper body made of polyolefin, which is attached to the mouth of a container and has a discharge port for discharging the contents contained in the container, An inner stopper made of polyolefin having an insertion portion that is inserted into the discharge port, the insertion portion of which adheres tightly to the inner circumferential surface of the discharge port to seal the discharge port, The system includes a polyolefin top cover that holds the inner stopper and is detachably attached to the stopper body together with the inner stopper, A cap in which the biomass plastic content Bi of the inner stopper is lower than the biomass plastic content Bo of the upper lid.

2. The cap according to claim 1, wherein the biomass plastic content Bo of the upper lid is 15% or more, and the biomass plastic content Bi of the inner stopper is less than 5%.

3. The cap according to claim 1 or 2, wherein when attaching or detaching the top cover to the stopper body, the surface of the inner stopper and at least one of the holding portion that holds the inner stopper and the inner circumferential surface of the discharge port slide against each other.

4. The cap according to claim 1 or 2, wherein the male thread provided on the cap body and the female thread provided on the top cover are screwed together, thereby fixing the cap body and the top cover to each other.

5. The stopper body is attached by pressing it into the mouth of the container. The cap according to claim 1 or 2, wherein the biomass plastic content Bm of the stopper body is lower than the biomass plastic content Bo of the top lid.

6. The cap according to claim 1 or 2, wherein the biomass plastic degree Bo of the top lid satisfies the following formula (1). Bo > 30% (1)

7. The cap according to claim 1 or 2, wherein the biomass plasticity Bi of the inner stopper and the biomass plasticity Bm of the stopper body satisfy the following formula (2). 10% > Bm ≥ Bi (2)

8. The aforementioned top lid includes biomass-derived polyethylene and block polypropylene. The stopper body contains linear low-density polyethylene resin, The cap according to claim 1 or 2, wherein the inner stopper comprises high-density polyethylene resin.

9. The cap according to claim 1 or 2, wherein the ratio of the mass of the top lid to the mass of the inner stopper is 5 or more.

10. The cap according to claim 1 or 2, wherein the ratio of the mass of the top lid to the total mass of the cap is 0.5 or more.

11. A container having the opening portion to which the cap according to claim 1 or 2 is attached, A container in which the biomass plastic content Bc of the container is greater than the biomass plastic content Bi of the inner stopper.

12. The container according to claim 11, wherein the container contains polyethylene terephthalate derived from biomass.

13. A container with a cap, comprising a cap according to claim 1 or 2, and a container having the mouth portion to which the cap is attached.

14. The capped container according to claim 13, wherein the container contains polyethylene terephthalate derived from biomass.

15. A container for contents, comprising a capped container according to claim 13, and contents contained in the capped container.

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