Fluid-tight container

Abstract

This fluid-tight container is provided with: a main body part formed from a film comprising a thermoplastic elastomer or a thermoplastic resin; and an injection port part which is connected to the main body part, is configured so as to be openable and closable, and can seal the main body part, in which a film forming the main body part is water-impermeable, has a glass transition temperature of less than 0 DEG C, and has a carbon dioxide gas permeability of 5 L / (m224 hratm) or more as measured at 10 DEG C in accordance with an accessory B of JISK7126-2. And the tensile strength measured at 10 DEG C in accordance with JISK7161-1 is 8 N / 10 mm or more.

Description

Technical Field

[0001] This invention relates to a fluid-sealed container that can be sealed with cold water containing carbon dioxide gas for use as a body cooling device. Background Technology

[0002] Products for cooling various parts of the body have long been widely used. Examples of such products include cooling gel sheets or cooling devices that are sealed with coolant or water. Furthermore, cooling devices that can be filled with water or carbon dioxide (carbon dioxide gas, dry ice, etc.) or can be filled with carbon dioxide (carbon dioxide gas, dry ice, etc.) instead of water are also known.

[0003] For example, Patent Document 1 discloses a cooling bag that can be filled with dry ice, with one side having multiple small holes through which carbon dioxide gas can pass, and the other side being formed of a heat-insulating material through which carbon dioxide gas cannot pass.

[0004] Existing technical documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-023274 Summary of the Invention

[0006] According to a certain aspect of the present invention, a fluid-sealed container is provided, comprising: a main body formed of a membrane, said membrane being composed of a thermoplastic elastomer or a thermoplastic resin; and an inlet connected to the main body and configured to be openable and closable to seal the main body, wherein the membrane forming the main body is impermeable to water, has a glass transition temperature of less than 0°C, and a carbon dioxide gas permeability of 5 L / (m²) measured according to Annex B of JIS K 7126-2 at 10°C. 2 • 24hr•atm) or more, and further, the tensile strength measured according to JIS K7161-1 at 10°C is 8 N / 10 mm or more. Attached Figure Description

[0007] Figure 1 This is a perspective view of the fluid-sealed container of this embodiment.

[0008] Figure 2 This is a front view of a cooling appliance obtained by sealing cold water containing carbon dioxide gas inside a fluid-sealed container according to this embodiment.

[0009] Figure 3 This is a schematic diagram illustrating an example of a cooling device obtained by sealing cold water containing carbon dioxide gas inside a fluid-sealed container, as described in this embodiment, and using it to hang on the leg.

[0010] Figure 4 It is Figure 2 A diagram illustrating an example of a cooling device used by hanging it around the neck. Detailed Implementation

[0011] When using cooling devices to cool various parts of the body, if the temperature is rapidly lowered (below 15°C), blood flow to that area will decrease, potentially preventing sufficient relief from fatigue or edema. Furthermore, the cooling effect is often localized. Therefore, it is preferable to allow carbon dioxide gas to permeate and penetrate during cooling, thus achieving both cooling and the effects of carbon dioxide gas (maintaining or promoting blood circulation). However, when using a cooling device that encloses cold water containing carbon dioxide gas, the container presents the following problem: maintaining carbon dioxide gas permeability at low temperatures makes it difficult to simultaneously ensure both conformability (fitting comfort) and durability (resistance to breakage or cracking) at low temperatures.

[0012] According to the present invention, a fluid-sealed container can be provided for use as a body cooling device by sealing cold water containing carbon dioxide gas at a temperature below 15°C. This fluid-sealed container maintains carbon dioxide gas permeability at low temperatures and exhibits excellent conformability and durability at low temperatures. Furthermore, by sealing cold water containing carbon dioxide gas at a temperature below 15°C within this fluid-sealed container to manufacture a cooling device, the device can improve cooling and fatigue relief without compromising the fit of the contact area or blood circulation, easily achieving a cooling effect over a large area of ​​the body, and is less prone to damage or cracking during use.

[0013] Hereinafter, preferred embodiments of the present invention will be described using the accompanying drawings. Furthermore, in all the drawings, the same symbols are used to denote the same constituent elements, and repetitive descriptions are omitted where appropriate. Additionally, for convenience, some parts of the drawings may have no symbols (omitted). Moreover, for ease of understanding the invention, the dimensional ratios of the components shown in the drawings may sometimes differ from the actual dimensional ratios.

[0014] [Overall Structure]

[0015] use Figures 1-4 The overall structure of the fluid-sealed container 100 of this embodiment will be described. Furthermore, Figure 1 This is a diagram illustrating an example of the fluid-sealed container 100 of this embodiment before the internal filling with cold water containing carbon dioxide gas. Figure 2 This diagram illustrates a cooling device obtained by sealing cold water containing carbon dioxide gas inside a modified version of the fluid-sealed container 100 of this embodiment. Additionally, Figure 3 This is a schematic diagram illustrating an example of a cooling device obtained by sealing cold water containing carbon dioxide gas inside a fluid-sealed container 100 according to this embodiment, which is then hung on the leg. Furthermore, Figure 4This is a schematic diagram illustrating an example of a cooling device obtained by sealing cold water containing carbon dioxide gas inside a modified version of the fluid-sealed container 100 of this embodiment, which is then worn around the neck.

[0016] The fluid-sealed container 100 in this embodiment is, for example, Figure 1 or Figure 2 The fluid-sealed container shown is designed to be used as a body cooling device by sealing in cold water containing carbon dioxide gas at a temperature below 15°C. It comprises: a main body 31 formed of a membrane made of a thermoplastic elastomer or thermoplastic resin; and an inlet 21 connected to the main body 31 and configured to be closable to seal the main body 31. Therefore, by injecting cold water containing carbon dioxide gas, etc., into the main body 31 through the inlet 21 and sealing it, and further cooling as needed, it can be manufactured, for example... Figure 3 or Figure 4 The cooling device is used in the manner shown. Furthermore, it can also be used repeatedly as a cooling device by replacing the carbon dioxide-containing cold water or similar substances sealed inside the inlet 21.

[0017] Furthermore, in Figure 2 In this embodiment, the main body 31 has two branch portions 31-1 that branch into two paths on both sides toward the injection port 21, and is bent or folded (for example, in an embodiment where the radius of curvature of the inner circumference is less than 15 cm). This makes it more suitable for use when hung around the user's neck or legs for a stable and close fit.

[0018] <Main Body>

[0019] First, the structure of the main body 31 will be explained. Next, the structure of the membrane forming the main body 31 will be described later.

[0020] The main body 31 is a bag-shaped or similar component with an internal space capable of enclosing cold water containing carbon dioxide gas at a temperature below 15°C; that is, it is a component that serves as the main body when manufacturing cooling appliances or the like. Furthermore, the main body 31 only needs to be a structure capable of enclosing cold water containing carbon dioxide gas at a temperature below 15°C; for example, it can also be a structure capable of enclosing solids or gases such as dry ice. Additionally, it can also be a structure capable of enclosing liquids other than cold water (such as warm water containing carbon dioxide gas). Here, "enclosing" means containing and sealing liquids or the like within the internal space of the main body 31; however, in this case, as described later, carbon dioxide gas can permeate to a certain extent from the membrane forming the main body 31.

[0021] Furthermore, the main body 31 is preferably structured such that, when enclosed in cold water containing carbon dioxide gas at a temperature of 15°C or below, at least one cross-section of the internal space is circular or elliptical; more preferably, at least a portion of the cross-section along the shorter side of the internal space is circular or elliptical. This is because it facilitates close contact with and adherence to various parts of the body. Here, "circular" refers to a generally circular shape, including not only embodiments where the cross-section is perfectly circular, but also embodiments where the value obtained by dividing the major axis by the minor axis is 2 or less, and further, 1.5 or less. Additionally, "elliptical" also refers to a generally elliptical shape, where the value obtained by dividing the major axis by the minor axis may exceed 2 but is less than 10.

[0022] However, the shape of the main body 31 is not limited to the above, and may be other shapes such as pillow or ice pack, as long as it can be used to abut against at least a part of the body and has an internal space that can enclose cold water containing carbon dioxide gas at a temperature of 15°C or below.

[0023] Furthermore, there are no particular limitations regarding the size of the main body 31, but for ease of use as a cooling device and contact with various parts of the body, it is preferable that the volume of the internal space of the main body 31 in each container (the area that can contain cold water containing carbon dioxide gas at a temperature below 15°C) is 50 cm³. 3 (0.05L) and above 2000cm 3 (2.0L) and below. This lower limit can be 100cm. 3 (0.1L) or more, or 120cm 3 (0.12L) and above. Maximum height is 1500cm. 3 (1.5L) or less, or 1200cm 3 (1.2L) or less.

[0024] <Injection port>

[0025] Next, the structure of the injection port 21 connected to the main body 31 will be described.

[0026] The inlet 21 is structured such that it connects to the main body 31, allowing cold water containing carbon dioxide gas to be injected into and sealed from there, and also allowing the sealed cold water containing carbon dioxide gas to be discharged. In other words, the inlet 21 is closable and can seal the main body 31. Therefore, there are no other limitations as long as it has such a structure; for example, [example shown]. Figures 1-4The following structure is shown as a suitable example: the injection port 21 has a detachable cap and a cap mounting portion, with male and female threads (screw strip portion) formed on the inner circumference of the cap and the outer circumference of the cap mounting portion, which can be screwed together for attachment, removal, and sealing. Furthermore, the cap can be a structure that can be completely detached from the fluid-sealed container 100, or it can be a structure connected to the cap mounting portion via a hinge portion or the like. Alternatively, it can be a non-detachable structure, such as a sliding type where the opening is opened and closed by sliding the cap-shaped member, or a screw-on type (a type of sealing using a resin or metal screw-on component).

[0027] By having such an inlet 21 and a main body 31 formed by a membrane as described later, the fluid-sealed container 100 of this embodiment can not only be made into a cooling device by sealing cold water containing carbon dioxide gas inside the main body 31, but can also be repeatedly used as a cooling device by replacing the cold water containing carbon dioxide gas inside the main body 31 through the inlet 21.

[0028] Furthermore, the fluid-sealed container 100 of this embodiment has a structure in which one or more inlet ports 21 as described above are connected to any region of the main body 31 in a manner that communicates with the internal space. Moreover, the connection area of ​​the inlet port 21 is not particularly limited, but it is preferable to connect it to an area that is not easily in contact with the body when the cooling device is made.

[0029] Furthermore, the size of the inlet 21 is not limited. For example, the opening diameter of the inlet 21 can be any size that allows for easy injection of cold water containing carbon dioxide gas. Additionally, the inlet 21 is preferably of a size and material that functions as a gripping part when injecting cold water containing carbon dioxide gas into the fluid-sealed container 100 of this embodiment or when using the obtained cooling device. Resin or metal are suitable materials for the inlet 21, but from the viewpoint of lightweighting the fluid-sealed container 100 of this embodiment, the inlet 21 is more preferably made of resin materials such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylon (Ny), acrylonitrile-butadiene-styrene copolymer (ABS), polyethylene terephthalate (PET), polylactic acid (PLA), polycarbonate (PC), epoxy resin, and polyurethane resin. The same applies when the cap is provided.

[0030] A cooling device is made by sealing cold water containing carbon dioxide gas inside a fluid-sealed container 100 of this embodiment, which has a main body 31 and an inlet 21 as described above. Figure 3 or Figure 4As shown, it is very suitable for use in a manner that allows the main body 31 to come into contact with various parts of the body (e.g., direct contact with the skin of various parts of the body, or contact with various parts of the body through a cloth or clothing that allows carbon dioxide gas to pass through).

[0031] Alternatively, it is also suitable to use multiple cooling devices configured as described above, and to position them in a designated location as wearable devices (wearable cooling devices). These multiple cooling devices can also be connected internally by pipes or the like, allowing the enclosed cold water containing carbon dioxide gas to move freely within them. Therefore, in this embodiment of the wearable device, it is also highly suitable to use it in a manner where the cooling device comes into contact with various parts of the body (e.g., direct contact with the skin).

[0032] [The membrane that forms the main body]

[0033] Next, the membrane composed of a thermoplastic elastomer or thermoplastic resin that forms the main body 31 of the fluid-sealed container 100 of this embodiment will be described in detail.

[0034] As described above, the membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is made of thermoplastic elastomer or thermoplastic resin, and is non-permeable to water, with a glass transition temperature of less than 0°C, and a carbon dioxide gas permeability of 5 L / (m²) measured according to Annex B of JIS K7126-2 at 10°C. 2 • 24hr•atm) or more, and furthermore, a tensile strength of 8 N / 10 mm or more, measured according to JIS K7161-1 at 10°C. These will be explained in detail below.

[0035] <Thermoplastic elastomers or thermoplastic resins>

[0036] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is made of thermoplastic elastomer or thermoplastic resin. That is, it is a membrane containing thermoplastic elastomer or thermoplastic resin as a main component. Furthermore, "containing as a main component" means containing 80% or more by mass, more preferably 90% or more, even more preferably 95% or more, and may also be 100% (a membrane made of thermoplastic elastomer or thermoplastic resin).

[0037] Here, "thermoplastic elastomer (TPE)" refers to a material that combines the properties of thermoplastic plastics with the properties (elasticity) of elastomers. There is no limitation as long as it is a thermoplastic elastomer capable of forming the film described above. Examples of preferred materials include thermoplastic polyurethane elastomer (TPU), thermoplastic olefin elastomer (TPO), and thermoplastic polystyrenic elastomer (TPS). Furthermore, the film is more preferably composed of one or more of these materials.

[0038] Furthermore, as a thermoplastic resin, there are no limitations on the material and thickness, as long as it can form a film that satisfies the above-mentioned impermeability, glass transition temperature, carbon dioxide gas permeability, and tensile strength. A film made of polyolefins such as polyethylene is shown as a preferred film, and a film made of linear low-density polyethylene (LLDPE) is shown as a more preferred film.

[0039] Furthermore, from the viewpoint of tactile sensation when in direct contact with the skin, the aforementioned membrane is more preferably composed of thermoplastic polyurethane elastomer or thermoplastic polyolefin elastomer. In particular, it is further preferred to be composed of thermoplastic polyurethane elastomer, based on the ease of maintaining carbon dioxide gas permeability at low temperatures and a high degree of conformity to the body at low temperatures and low-temperature durability. Additionally, the thermoplastic polyurethane elastomer can be either ether-based or ester-based, but a membrane composed of an ether-based thermoplastic polyurethane elastomer is more preferred because it provides a high degree of conformity to the body at low temperatures and low-temperature durability, maintains high carbon dioxide gas permeability at low temperatures, and also exhibits excellent water resistance. Furthermore, it also exhibits excellent abrasion resistance.

[0040] Here, "ether-based thermoplastic polyurethane elastomer" refers to a thermoplastic polyurethane elastomer molecule with ether bonds (-O-) in its main chain, and "ester-based thermoplastic polyurethane elastomer" refers to a thermoplastic polyurethane elastomer molecule with ester bonds (-COO-) in its main chain.

[0041] Furthermore, when the aforementioned membrane is made of thermoplastic polyurethane elastomer, a membrane with a rubber hardness of 50 to 85 as measured using a Type A hardness tester (such as the digital hardness tester EA760AS-11 manufactured by Ikeda Rika Co., Ltd.) according to JIS K 6253 is more preferable. This is because it easily achieves a high balance between conformity to the body at low temperatures and durability at low temperatures, while also maintaining high carbon dioxide gas permeability at low temperatures. From the viewpoint of carbon dioxide gas permeability at low temperatures, this upper limit is further preferably 83 or less, and more preferably 80 or less. From the viewpoint of durability, the lower limit is further preferably 55 or more, more preferably 60 or more, more preferably 65 or more, more preferably more than 70, and more preferably 75 or more. Moreover, membranes made of ether-based thermoplastic polyurethane elastomers are preferred because the rubber hardness tends to fall within the aforementioned range.

[0042] <Non-permeable>

[0043] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is entirely impermeable to water. Therefore, when the fluid-sealed container 100 of this embodiment is used to make a cooling appliance by sealing cold water containing carbon dioxide gas, the sealed cold water is substantially not lost during use. Furthermore, the term "impermeable to water" here means that it does not allow liquids such as water to pass through. However, the membrane may also have water vapor permeability in addition to carbon dioxide gas permeability. For example, the water vapor permeability of this membrane, measured according to JIS K7129 at 25°C and 90% RH, is 5 g / (m²). 2 •24hr) or more 200g / (m 2 •24hr) or less.

[0044] <Glass transition temperature>

[0045] The glass transition temperature (Tg) of the membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is less than 0°C. Therefore, when used as a body cooling device by sealing cold water containing carbon dioxide gas at a temperature below 15°C, the main body 31 is less likely to become too rigid, resulting in decreased fit or increased susceptibility to breakage or cracking. Furthermore, this glass transition temperature is more preferably -5°C or less, more preferably -10°C or less, more preferably -15°C or less, and more preferably -18°C or less. From the viewpoint of durability, this lower limit is preferably -120°C or more, more preferably -90°C or more, more preferably -60°C or more, and more preferably -40°C or more.

[0046] <Carbon Dioxide Gas Transmission>

[0047] Regarding the membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment, the carbon dioxide gas permeability, measured according to Annex B of JIS K7126-2 at 10°C, is 5 L / (m²). 2 •24hr•atm) or more. That is, according to Annex B (Test Method using Gas Chromatography) of JIS K 7126-2 (Gas Permeability Measurement Method, Isobaric Method), the carbon dioxide gas permeability of the membrane measured using a specified machine at 10°C is 5 L / (m 2 •24hr•atm) or more. Therefore, when a cooling device is made by sealing cold water containing carbon dioxide gas inside the fluid-sealed container 100 of this embodiment, the carbon dioxide gas will fully penetrate into the skin and other parts that are followed and contacted by the membrane forming the main body 31, thereby maintaining or promoting blood circulation in the cooled area. As a result, it also improves fatigue or edema after exercise, etc., and the cooling effect is not localized but easily spreads to the whole body.

[0048] From the perspective of considering durability, the lower limit of carbon dioxide gas permeability is more preferably 7 L / (m²). 2 •24hr•atm) or more, more preferably 10L / (m 2 •24hr•atm) or more, more preferably 12L / (m 2 •24hr•atm) or more, more preferably 15L / (m 2 •24hr•atm) or more, more preferably 18L / (m 2 •24hr•atm) or more, more preferably 20L / (m 2 •24hr•atm) or higher. This upper limit is preferably 100L / (m³). 2 • 24hr • atm) or less, more preferably 80 L / (m 2 • 24hr • atm) or less, more preferably 50 L / (m 2 • 24hr • atm) or less. Therefore, when manufacturing cooling appliances, it is easy for carbon dioxide gas to move fully from cold water containing carbon dioxide gas through the membrane to the skin, etc., to maintain or promote blood circulation, and it is also durable.

[0049] Furthermore, the carbon dioxide gas permeability can be adjusted according to the constituent material of the membrane of the main body 31 of the fluid-sealed container 100 of this embodiment and its total thickness.

[0050] <Tensile strength at 10℃>

[0051] Regarding the membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment, the tensile strength measured at 10°C according to JIS K7161-1 is 8 N / 10 mm or more. Therefore, the low-temperature durability of the main body 31 of the fluid-sealed container 100 of this embodiment is excellent. This lower limit is more preferably 10 N / 10 mm or more, further preferably 15 N / 10 mm or more, further preferably 20 N / 10 mm or more, further preferably 30 N / 10 mm or more, and further preferably 40 N / 10 mm or more. This upper limit can be 150 N / 10 mm or less, or 130 N / 10 mm or less, or 100 N / 10 mm or less, or 80 N / 10 mm or less, or 60 N / 10 mm or less.

[0052] Here, the "tensile strength measured according to JISK 7161-1 at 10°C" refers to the physical property measured based on JISK 7161-1 (Plastics - Methods for determining tensile properties -) taking into account the response to cracking (high speed, local deformation) under low-temperature use, and is obtained as follows: Test pieces are neatly cut into rectangles 10mm wide and 70mm long from the film and stored at 10°C for 24 hours. Meanwhile, at 23°C, a Tensilon UTC-100W manufactured by Orientec is prepared with a clamping distance (the clamping distance in the installed state before the test piece is stretched) of 30mm, a clamping speed of 300mm / min (the stretching speed), and measurement conditions under normal test mode. At each measurement, the test piece is removed from the 10°C environment and subjected to a tensile test under the aforementioned conditions using the Tensilon UTC-100W manufactured by Orientec within 2 minutes to determine the breaking strength (tensile strength at which the film breaks). (strength), N / 10mm), this measurement was performed 3 times, and the obtained values ​​were averaged.

[0053] Furthermore, the tensile strength can also be adjusted according to the constituent material of the membrane of the main body 31 of the fluid-sealed container 100 of this embodiment and its total thickness.

[0054] <Elongation at 10°C under a load of 0.98 N>

[0055] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is not limited, but in terms of better conformability to the body at low temperatures, it is more preferable to use a membrane as described above, with an elongation of 2% or more when subjected to a load of 0.98 N (100 g weight), as measured according to JISK7161-1 at 10°C. That is, it is more preferable that the elongation at 10°C is certain or more. This lower limit is more preferably 3% or more, and more preferably 4% or more. Furthermore, from the viewpoint of durability, this upper limit is more preferably 20% or less, more preferably 18% or less, and more preferably 15% or less.

[0056] Here, the "elongation at 0.98 N under load, measured according to JISK 7161-1 and at 10°C" refers to the physical property measured according to JISK 7161-1 (Plastics - Methods for determining tensile properties) taking into account the response to cracking under low-temperature use (initial response to impact force), and is obtained as follows: test pieces were neatly cut into rectangles 10 mm wide and 150 mm long from the film and stored at 10°C for one day and one night; on the other hand, at 23°C, with a clamping distance of 100 mm, Measurement conditions under chuck speed of 300 mm / min and cyclic test mode: Using an Orientec Tensilon UTC-100W, the test piece was removed from a 10°C environment and, within 2 minutes, the elongation rate (the ratio of the elongated length to 100% of the original membrane length) was measured under the above conditions when a load of 0.98 N was applied in the elongation direction (outward path) under the above conditions. This measurement was performed three times, and the obtained values ​​were averaged. This value can be considered to represent the ease of membrane elongation at low temperatures.

[0057] Furthermore, the elongation can also be adjusted according to the constituent material of the membrane of the main body 31 of the fluid-sealed container 100 of this embodiment and its total thickness.

[0058] <Permanent strain after 100% elongation at 10°C>

[0059] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is not limited, but in terms of improving conformity to the body at low temperatures or enhancing durability at low temperatures, a membrane as described above is more preferable, and the permanent strain after 100% elongation, measured according to JIS K7161-1 at 10°C, is 20% or less. This upper limit is further preferably 15% or less, further preferably 13% or less, and further preferably 10% or less. Furthermore, a membrane made of an ether-based thermoplastic polyurethane elastomer is preferred because its permanent strain is also likely to be within the above-mentioned range.

[0060] Here, the "permanent strain after 100% elongation measured according to JISK 7161-1 at 10°C" refers to the physical property measured according to JISK 7161-1 (Plastics - Methods for determining tensile properties -) taking into account the response to repeated deformation under low-temperature use (for strain recovery), and is obtained as follows: test pieces were neatly cut into rectangles 10mm wide × 150mm long from the film and stored at 10°C for 24 hours. On the other hand, the test pieces were subjected to a cyclic test at 23°C with a clamp spacing of 100mm, a clamp speed of 300mm / min. For measurement conditions, an Orientec Tensilon UTC-100W was used. During each measurement, the test piece was removed from a 10°C environment and, within 2 minutes, stretched to 100% using the Orientec Tensilon UTC-100W under the aforementioned conditions. Then, the clamp was moved back to 0% at the same clamp speed. The elongation rate (the ratio of the elongated length when the membrane length before elongation is set to 100%, i.e., the permanent strain after 100% elongation) was measured when the elongation stress in the recovery direction (return path) became 0N. This measurement was performed three times, and the obtained values ​​were averaged. That is, it can be considered to represent the ease of recovery when the membrane elongates at low temperatures. Furthermore, this permanent strain can also be adjusted according to the constituent material of the membrane of the main body 31 of the fluid-sealed container 100 of this embodiment and its total thickness.

[0061] Furthermore, the above-mentioned elongation and permanent strain measurements can both be performed using the devices described above (such as the TensilonUTC-100W manufactured by Orientec Corporation). The forward and reverse paths are measured through the above-mentioned cyclic test, and the values ​​of each are read based on the obtained measurement results.

[0062] Here, a higher specified elongation at low temperature and a lower specified permanent strain at low temperature are preferred characteristics in the following aspects: taking into account the ease with which the cooling appliance will crack when dropped during use at low temperatures and its conformity to the body. That is, in order to prevent damage such as cracking or breakage when an impact force is applied to the cooling appliance, either of the following characteristics is required: (1) having strength comparable to the destructive force (e.g., non-elastic thick films such as LLDPE 100μm film); (2) having elasticity that can instantly conform to rapid deformation stress. However, in the case of (1), although it is strong, it lacks deformability and its conformity to the body is insufficient. In addition, films such as (1) are prone to permanent strain and accumulation due to localized load concentration caused by repeated use, which can easily lead to damage. On the other hand, as mentioned above, if the specified elongation at low temperature is higher or the specified permanent strain at low temperature is lower, such risks are more likely to be minimized, and the conformity to the body is also more likely to be higher.

[0063] <Melting Point>

[0064] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment is not limited, but its melting point (Tm) is more preferably 120°C or higher and 150°C or lower in order to easily achieve excellent heat sealing performance. This lower limit is more preferably 125°C or higher, and more preferably higher than 130°C. This upper limit is more preferably 145°C or lower, and more preferably 140°C or lower.

[0065] Furthermore, when the main body 31 of the fluid-sealed container 100 in this embodiment is formed by the above-mentioned membrane and heat sealing, its sealing strength is more preferably 10 N / 10 mm or more, and even more preferably 15 N / 10 mm or more.

[0066] Here, the so-called "sealing strength" refers to the value obtained in the following manner: a test piece with a width of 10 mm and a length of 70 mm (the width of the sealing part is 1 mm, i.e., the sealing part is 10 mm × 1 mm) including the sealing part is cut from the membrane forming the main body 31. Except for the difference in the size of the test piece, the sealing strength is determined based on the method of JISK6854-3 (T-shaped peel test) using a TensilonUTC-100W manufactured by Orientec, with a clamp distance of 30 mm, a clamp speed of 300 mm / min, and measurement conditions under normal test mode. The measurement is performed 3 times, and the obtained values ​​are averaged.

[0067] <Total membrane thickness>

[0068] The membrane forming the main body 31 of the fluid-sealed container 100 of this embodiment only needs to have its total thickness appropriately set according to the constituent materials, etc., in a way that maintains the aforementioned physical properties. However, in order to easily achieve a high degree of balance between body conformity at low temperatures, durability at low temperatures, and carbon dioxide gas permeability at low temperatures, its total thickness is preferably 50 μm or more and less than 250 μm. This lower limit is more preferably 80 μm or more, more preferably 100 μm or more, and more preferably 120 μm or more. This upper limit is more preferably 230 μm or less, and more preferably 200 μm or less.

[0069] Here, the "total thickness" of the membrane refers to the entire length of the membrane forming the main body in the thickness direction, that is, the sum of the thickness of all the layers constituting the membrane. Therefore, in a membrane with multiple layers, including coating layers, the total thickness is the sum of the thicknesses of all the layers.

[0070] Furthermore, the fluid-sealed container 100 of this embodiment can be manufactured by methods such as heat sealing to bond and shape the above-mentioned single-layer or multi-layer membranes to form a main body 31 with the shape described above, and then connecting the above-mentioned injection port 21 to a predetermined position on the main body 31.

[0071] The fluid-sealed container 100 of this embodiment described above can be sealed with cold water containing carbon dioxide gas at a temperature below 15°C and used as a body cooling device. It exhibits carbon dioxide gas permeability at low temperatures exceeding a specified limit, and demonstrates excellent conformity to the body and durability at low temperatures. Therefore, by sealing the fluid-sealed container 100 with cold water containing carbon dioxide gas at a temperature below 15°C, the cooling device can be hung on a part of the user's body, particularly the legs or neck, allowing direct contact and application with the skin (e.g., by using…). Figure 3 , Figure 4 (Applied and cooled in various ways), this device fully utilizes the cooling function of cold water and the function produced by carbon dioxide gas permeation, based on its conformability and carbon dioxide gas permeability, thereby achieving a higher cooling effect, maintaining or promoting blood circulation, etc. Furthermore, this cooling effect is easily achieved not only at the point of contact with the cooling device but also over a large area of ​​the body. Moreover, this cooling device is less prone to breakage or cracking during use.

[0072] For example, it is suitable to manufacture a cooling appliance that seals cold water containing carbon dioxide gas at a temperature of 15°C or lower and a carbon dioxide gas concentration of 300 ppm or higher within the fluid-sealed container 100 of this embodiment. The concentration of carbon dioxide gas in the cold water is not limited, but is more preferably 400 ppm or higher, more preferably 500 ppm or higher, and even more preferably 700 ppm or higher. This upper limit can be 1500 ppm or lower, 1200 ppm or lower, or 1000 ppm or lower. Furthermore, the carbon dioxide gas concentration, with respect to the range exceeding the carbon dioxide saturation point of the cold water, is assumed to be the concentration dissolved in the cold water. Additionally, the water temperature only needs to be 15°C or lower (0°C to 15°C), for example, 10°C or lower.

[0073] Furthermore, as described above, the fluid-sealed container 100 of this embodiment can be used as a cooling appliance by sealing it with cold water containing carbon dioxide gas at a temperature below 15°C. However, it includes not only the embodiment of filling and sealing the container with cold water containing carbon dioxide gas at a temperature below 15°C to form a cooling appliance, but also the embodiment of filling and sealing the container with water containing carbon dioxide gas and then cooling the entire container with cold water or ice at a temperature below 15°C to form a cooling appliance. Therefore, when used as a cooling appliance, if the temperature of the sealed cold water containing carbon dioxide gas rises, it can be directly cooled with cold water or ice to lower the temperature of the sealed water containing carbon dioxide gas. In addition, the fluid-sealed container 100 of this embodiment can be sealed with cold water or the like, and a carbon dioxide gas generating agent (e.g., a solid, powdered, or granular carbon dioxide gas generating agent) that will generate carbon dioxide gas when dissolved in cold water or the like can be mixed and stirred. Furthermore, it can be further cooled in the manner described above.

[0074] Furthermore, the fluid-sealed container 100 of this embodiment can be used not only as a cooling appliance by sealing cold water containing carbon dioxide gas at a temperature below 15°C, but also for other purposes. For example, it can be used as a heating appliance by sealing warm water containing carbon dioxide gas inside the fluid-sealed container 100. Furthermore, by hanging this heating appliance on the legs or neck, a higher level of warming effect and blood circulation promotion effect can be obtained through the heat and carbon dioxide gas permeation. In this case, similar to the aforementioned cold water containing carbon dioxide gas, the carbon dioxide gas concentration of the warm water containing carbon dioxide gas is preferably 300 ppm or higher.

[0075] Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments, and various modifications can be made within the technical concept of the present invention.

[0076] [Example]

[0077] Formed by heat sealing using a film or sheet made of the materials shown in Table 1 below. Figure 2 The main body of the shape shown was used to manufacture fluid-sealed containers of Examples 1-8 and Comparative Examples 1-3. Then, 400g of cold water containing carbon dioxide gas at a temperature of 10°C and a carbon dioxide gas concentration of 1000ppm was sealed inside these fluid-sealed containers to manufacture various cooling appliances.

[0078] Furthermore, details of each membrane or sheet are as follows. They are all non-permeable.

[0079] • Examples 1-3: Films made of ether-based thermoplastic polyurethane elastomer (Elastollan 1180A, manufactured by BASF).

[0080] • Examples 4-6: Films made of ester-based thermoplastic polyurethane elastomer (Elastollan C85A, manufactured by BASF).

[0081] • Example 7: A film made of ester-based thermoplastic polyurethane elastomer (Elastollan C90A, manufactured by BASF).

[0082] • Example 8: A film made of linear low-density polyethylene (LLDPE) (manufactured by a Japanese company).

[0083] • Comparative Example 1: A film made of linear low-density polyethylene (LLDPE) (manufactured by TRUSCONAKAYAMA).

[0084] • Comparative Example 2: A membrane composed of a 4-methyl-1-pentene-α-olefin copolymer (ABSORTOMER, manufactured by Mitsui Chemicals).

[0085] • Comparative Example 3: A sheet with a three-layer structure, consisting of an outer layer of a 4-methyl-1-pentene-α-olefin copolymer (ABSORTOMER, manufactured by Mitsui Chemicals Co., Ltd.) and an intermediate layer of a styrene-based elastomer (SEBS, Septon 2063, manufactured by Kuraray Co., Ltd.) which is a block copolymer of polystyrene, polyethylene, and polybutene.

[0086] Then, for these membranes or sheets forming the main body, the carbon dioxide gas permeability (L / (m)) at 10°C is determined in advance in the following manner. 2 •24hr•atm), elongation (%) when a load of 0.98N is applied at 10°C, permanent strain (%) after 100% elongation at 10°C, tensile strength (N / 10mm) at 10°C, and sealing strength (N / 10mm).

[0087] <Carbon dioxide gas permeability at 10℃>

[0088] According to Annex B (Test Method Using Gas Chromatography) of JISK7126-2 (Gas Permeability Measurement Method, Isobaric Method), the carbon dioxide gas permeability of each membrane or sheet was determined under a 10°C testing environment. A gas permeability measuring machine (GTR-10XFKS, Gas Chromatography) manufactured by GTRTEC was used for the measurement.

[0089] <Elongation at 10°C under a load of 0.98 N>

[0090] Based on JIS K 7161-1 (Plastics - Determination of tensile properties -), multiple test pieces were prepared from each film or sheet, neatly cut into rectangles 10 mm wide and 150 mm long, and stored at 10°C for 24 hours. Furthermore, a Tensilon UTC-100W manufactured by Orientec was prepared at 23°C under the following measurement conditions.

[0091] • Spacing distance: 100mm

[0092] • Chuck speed: 300 mm / minute

[0093] • Cyclic test mode

[0094] Then, measure the following values.

[0095] • Elongation in the direction of elongation (towards the target path) under a load of 0.98N

[0096] Furthermore, the test pieces were removed from a 10°C environment for each measurement, and the measurement was performed within 2 minutes. Additionally, the measurement results were set as the average value of N=3.

[0097] <Permanent strain after 100% elongation at 10°C>

[0098] Based on JIS K 7161-1 (Plastics - Determination of Tensile Properties -), in the above elongation test, the test piece was prepared under the above conditions (clamp distance: 100 mm, clamp speed: 300 mm / min, cyclic test mode) and elongated to 100%. The clamp was then moved back to 0% (clamp speed: 300 mm / min), and the elongation at which the elongation stress in the recovery direction (return path) became 0 N was measured as the permanent strain after 100% elongation at 10°C. Furthermore, the measured results were set as the average value for N=3.

[0099] <Tensile strength at 10℃>

[0100] Based on JISK7161-1 (Plastics - Determination of tensile properties -), rectangular test pieces with a width of 10 mm and a length of 70 mm were prepared in the same manner as the above elongation determination. Tensile tests were performed using a TensilonUTC-100W manufactured by Orientec under the following conditions, and the breaking strength (tensile strength at which the test piece breaks) was determined.

[0101] • Spacing distance: 30mm

[0102] • Chuck speed: 300 mm / minute

[0103] • Typical test mode

[0104] In addition, the measurement results are set as the average value of N=3.

[0105] <Sealing strength>

[0106] Cut out a test piece with a width of 10 mm and a length of 70 mm, including the sealing part. Except for the difference in the size of the test piece, determine the sealing strength (T-peel test) under the following conditions based on the method described in JISK 6854-3.

[0107] • Device: TensilonUTC-100W manufactured by Orientec

[0108] • Test piece width: 10mm

[0109] • Length in sealing test direction: 1mm (sealing width)

[0110] • Spacing distance: 30mm

[0111] • Chuck speed: 300 mm / minute

[0112] Furthermore, the measurement results are set as the average value of N=3.

[0113] These results are shown in Table 1 below. In addition, the glass transition temperature (Tg: °C), melting point (Tm: °C), rubber hardness measured using a Type A hardness tester (digital hardness tester EA760AS-11, manufactured by Ikeda Rika Co., Ltd.) according to JIS K6253, and total thickness (μm) of these films or sheets are also shown in Table 1 below.

[0114] Furthermore, for the various cooling devices manufactured, the following evaluations were conducted on skin redness, coolness, head coolness, fit, and overall user experience when worn near the user's neck: Skin redness, coolness, and head coolness were assessed primarily based on the permeability and tracking performance of carbon dioxide gas at low temperatures. Sufficient carbon dioxide gas reaching the skin surface would cause skin redness due to improved blood circulation, and the cooling effect would also extend to the head.

[0115] <Redness of the skin>

[0116] After hanging the cooling device near the neck of one person in the observation group for 5 minutes, visually observe the skin at the contact point. If the skin is red, mark it as ○; if there is no redness, mark it as ×.

[0117] <Icy>

[0118] The following evaluation was conducted by a team of three professionals who used the cooling device by placing it directly on the neck for 5 minutes in contact with the skin. Furthermore, the evaluation was conducted in an environment of 30°C and 60% RH, with the evaluation performed after a 30-minute acclimatization period (N=3).

[0119] Choose the closest rating from the following three levels as the feeling of coolness after 5 minutes of use, and calculate the average of those three ratings. The average is rounded to the nearest integer.

[0120] 3. The coolness is not concentrated in the neck, but comfortably spreads / a real feeling of coolness can be felt over a large area.

[0121] 2. A cold feeling in the neck accompanied by discomfort. The sensation of coldness spreads slightly and is not limited to the neck.

[0122] 1. Only the contact area of ​​the neck feels cold and painful.

[0123] <The feeling of coolness in the head>

[0124] The following assessment was conducted in the same manner as the assessment of the coldness described above.

[0125] After 5 minutes of use, select the closest rating from the following 3-level ratings as the feeling of coolness in the head, and calculate the average of the 3 ratings. The average is rounded to the nearest integer.

[0126] 3. Immediately after wearing it, I felt a cooling sensation on my head, and after 5 minutes of use, my head felt cool.

[0127] 2. After using it for 5 minutes, I felt a cool sensation on my head.

[0128] 1. No feeling of coldness in the head.

[0129] <Fitness>

[0130] The following assessment was conducted in the same manner as the assessment of the coldness described above.

[0131] During a 5-minute usage period, for the softness, fit, and tightness of the wearing cooling device around the neck, select the closest rating from the following 3-point scale and calculate the average of the 3 ratings. The average is rounded to the nearest integer.

[0132] 3. It remains soft even immediately after wearing and conforms to the curves of the neck. It adheres closely to the skin and maintains a snug fit throughout the wearing process.

[0133] 2. While slightly rough, it doesn't feel like a close fit to the skin, but it generally conforms to the curve of the neck. Or, while it generally conforms, the feel is poor, for example, it feels sticky.

[0134] 1. It's quite stiff and doesn't fit the neck well.

[0135] <Overall user experience>

[0136] The following assessment was conducted in the same manner as the assessment of the coldness described above.

[0137] Select the closest rating from the following three levels of evaluation as the overall user experience over a 5-minute period, and calculate the average of those three ratings. The average is rounded to the nearest integer.

[0138] 3. The effects can be felt in terms of both the pleasant wearing experience (comfortable use) and the cool feeling on the head.

[0139] 2. You will feel the effect in either the good wearing experience (comfortable use) or the cool feeling on your head.

[0140] 1. There is no good wearing experience (comfortable use) and no feeling of coldness on the head.

[0141] Furthermore, each of the various fluid-sealed containers was filled with 400g of water at 10°C and sealed to make a cooling device. After standing for 1 minute to adapt to the temperature, its ruptureability when dropped from 1.5m was confirmed in the following manner.

[0142] <Fragility upon drop from 1.5m>

[0143] Under the following conditions, drop each cooling device and check for cracks according to the criteria in points 1 to 3 below.

[0144] • Tighten so that there are no gaps (top space) except for the water-filled part, and tighten it tightly.

[0145] • It was dropped from a height of 1.5m onto a floor covered with a stainless steel tray.

[0146] • Regarding the orientation of the drop, drop it so that both front ends of the U-shape of the cooling appliance land simultaneously. If it lands at an angle or only one side lands first, restart the process from the beginning of the cooling appliance's preparation. Evaluate with N=1.

[0147] • Set the ambient temperature and humidity to 25℃ and 50%RH.

[0148] 3. No damage, no leakage.

[0149] 2. Although the membrane was not damaged, the sealing part was damaged (pinholes and / or cracks in the sealing part), resulting in water leakage.

[0150] 1. The membrane is cracked and the sealing part is also damaged, resulting in water leakage.

[0151] These results are also shown in the lower paragraph of Table 1 below.

[0152] Based on these results, it is shown that Examples 1-8 are fluid-sealed containers that maintain excellent carbon dioxide gas permeability at low temperatures, as well as excellent body conformity and durability at low temperatures, and can be used as body cooling devices by encapsulating cold water containing carbon dioxide gas. Examples 1-8 have a glass transition temperature of -20°C or lower for the non-water-permeable membrane forming the main body, and a carbon dioxide gas permeability of 7 L / (m²) measured at 10°C according to Annex B of JIS K 7126-2. 2 • 24hr•atm) or more, and the tensile strength measured at 10°C according to JISK7161-1 is 8.38 N / 10 mm or more. Furthermore, it indicates that cooling effects can be obtained not only at the contact points. It implies that, in particular, Examples 1-6 formed by films made of thermoplastic polyurethane elastomers with a specified rubber hardness of 85 or less maintain high durability at low temperatures, and exhibit higher carbon dioxide gas permeability and better body conformity at low temperatures, with even better cooling characteristics. Examples 1-3 formed by films made of ether-based thermoplastic polyurethane elastomers, in addition to these characteristics, exhibit lower specified permanent strain and better body conformity or durability at low temperatures.

[0153] On the other hand, Comparative Example 1, formed by a membrane with insufficient carbon dioxide gas permeability at low temperatures, did not exert any effect on maintaining or promoting blood circulation during cooling (only achieving a local cooling effect), while Comparative Examples 2-3, formed by membranes with higher glass transition temperatures, had lower body conformity and low-temperature durability at low temperatures.

[0154] [Table 1]

[0155]

[0156] Furthermore, the above-described embodiments incorporate the following technical concepts.

[0157] <1> A fluid-sealed container, wherein,

[0158] It comprises: a main body formed of a film, the film being composed of a thermoplastic elastomer or a thermoplastic resin; and an injection port connected to the main body and configured to be openable and closable to seal the main body.

[0159] The membrane forming the main body is non-water-permeable, with a glass transition temperature of less than 0°C, and a carbon dioxide gas permeability of 5 L / (m²) measured according to Annex B of JIS K7126-2 at 10°C. 2 • 24hr•atm) or more, and further, the tensile strength measured according to JIS K7161-1 at 10°C is 8 N / 10 mm or more.

[0160] <2> As described in <1>, a fluid-sealed container, wherein,

[0161] The membrane forming the main body is a membrane made of thermoplastic polyurethane elastomer.

[0162] <3> As described in <2>, the fluid-sealed container, wherein,

[0163] The rubber hardness of the film made of the above-mentioned thermoplastic polyurethane elastomer, measured using a Type A hardness tester according to JIS K6253, is 50 or more and 85 or less, more preferably 60 or more and 83 or less, and even more preferably 65 or more and 80 or less.

[0164] <4> The fluid-sealed container as described in <2> or <3>, wherein,

[0165] The aforementioned thermoplastic polyurethane elastomer is an ether-based thermoplastic polyurethane elastomer.

[0166] <5> A fluid-sealed container as described in any of <1> to <4>, wherein,

[0167] The elongation of the membrane forming the main body, measured according to JISK7161-1 and at 10°C when subjected to a load of 0.98N, is 2% or more, more preferably 3% or more and 20% or less, even more preferably 4% or more and 18% or less, and even more preferably 4% or more and 15% or less.

[0168] <6> A fluid-sealed container as described in any of <1> to <5>, wherein,

[0169] The permanent strain after 100% elongation, as measured according to JISK7161-1 and at 10°C, of ​​the membrane forming the main body is 20% or less, more preferably 15% or less, even more preferably 13% or less, and even more preferably 10% or less.

[0170] <7> A fluid-sealed container as described in any of <1> to <6>, wherein,

[0171] The melting point of the film forming the main body is 120°C or higher and 150°C or lower, more preferably 125°C or higher and 145°C or lower, and even more preferably 130°C or higher and 140°C or lower.

[0172] <8> A fluid-sealed container as described in any of <1> to <7>, wherein,

[0173] The total thickness of the film forming the main body is 50 μm or more and less than 250 μm, more preferably 80 μm or more and less than 230 μm, and even more preferably 100 μm or more and less than 200 μm.

[0174] <9> A fluid-sealed container as described in any of <1> to <8>, wherein,

[0175] The glass transition temperature of the film forming the main body is -5°C or less, more preferably -90°C or more and -10°C or less, even more preferably -60°C or more and -15°C or less, and even more preferably -40°C or more and -18°C or less.

[0176] <10> A fluid-sealed container as described in any of <1> to <9>, wherein,

[0177] The carbon dioxide gas permeability of the membrane forming the main body is 10 L / (m²). 2 •24hr•atm) or more, preferably 12L / (m 2 •24hr•atm) or more, more preferably 15L / (m 2 •24hr•atm) or above 100L / (m 2 • 24hr • atm) or less, more preferably 18L / (m 2 •24hr•atm) or above 80L / (m 2 • 24hr • atm) or less, more preferably 20 L / (m 2 •24hr•atm) or above 50L / (m 2 •24hr•atm) or less.

[0178] <11> A fluid-sealed container as described in any of <1> to <10>, wherein,

[0179] The tensile strength of the membrane forming the main body is 10 N / 10 mm or more, more preferably 15 N / 10 mm or more and 150 N / 10 mm or less, even more preferably 20 N / 10 mm or more and 130 N / 10 mm or less, even more preferably 30 N / 10 mm or more and 100 N / 10 mm or less, and even more preferably 40 N / 10 mm or more and 80 N / 10 mm or less.

[0180] <12> A fluid-sealed container as described in any of <1> to <11>, wherein,

[0181] The glass transition temperature of the membrane forming the main body is -40°C to -18°C, and the carbon dioxide gas permeability is 15 L / (m²). 2 •24hr•atm) or above 50L / (m 2 • 24hr • atm) or less, and the above tensile strength is 20N / 10mm or more and 130N / 10mm or less.

[0182] <13> A cooling appliance, wherein the fluid-sealed container described in any one of <1> to <12> contains cold water containing carbon dioxide gas at a temperature of 15°C or less and a carbon dioxide gas concentration of 300 ppm or more.

[0183] <14> A method of using a cooling device (body cooling method), wherein the cooling device described in <13> is used (cooling) by contacting a part of the user's body, more preferably a part of the legs or neck.

[0184] <15> The method of using the cooling device as described in <14>, wherein the cooling device is used by making direct contact between the cooling device and the skin of the user’s body part.

[0185] This application claims priority based on Japanese Patent Application No. 2023-102974, filed on June 23, 2023, all of which is incorporated herein by reference.

[0186] Explanation of symbols

[0187] 100 Fluid-sealed containers

[0188] 101 Cooling Equipment

[0189] 21 Inject into the mouth

[0190] 31 Main Body

[0191] 31-1 Branch.

Claims

1. A fluid-sealed container, wherein, It comprises: a main body formed of a membrane, said membrane being composed of a thermoplastic elastomer or a thermoplastic resin; and an injection port connected to said main body and configured to be openable and closable to seal said main body. The membrane forming the main body is non-water-permeable, with a glass transition temperature less than 0°C, and a carbon dioxide gas permeability of 5 L / (m²) measured according to Annex B of JIS K 7126-2 at 10°C. 2 • 24hr•atm) or more, and further, the tensile strength measured according to JIS K7161-1 at 10°C is 8 N / 10 mm or more.

2. The fluid-sealed container as claimed in claim 1, wherein, The membrane forming the main body is a membrane made of thermoplastic polyurethane elastomer.

3. The fluid-sealed container as described in claim 2, wherein, The membrane, which is made of the thermoplastic polyurethane elastomer, has a rubber hardness of 50 to 85 as measured by a Type A hardness tester according to JIS K6253.

4. The fluid-sealed container as described in claim 2 or 3, wherein, The thermoplastic polyurethane elastomer is an ether-based thermoplastic polyurethane elastomer.

5. The fluid-sealed container as described in any one of claims 1 to 4, wherein, The elongation of the membrane forming the main body portion, measured according to JIS K7161-1 and at 10°C, is 2% or more when a load of 0.98 N is applied.

6. The fluid-sealed container as described in any one of claims 1 to 5, wherein, The membrane forming the main body is based on JIS K7161-1 and the permanent strain after 100% elongation, measured at 10°C, is less than 20%.

7. The fluid-sealed container as described in any one of claims 1 to 6, wherein, The melting point of the film forming the main body is above 120°C and below 150°C.

8. The fluid-sealed container as described in any one of claims 1 to 7, wherein, The total thickness of the membrane forming the main body is 50 μm or more and less than 250 μm.

9. A cooling device, wherein, The fluid-sealed container according to any one of claims 1 to 8 contains cold water containing carbon dioxide gas at a temperature of 15°C or below and a carbon dioxide gas concentration of 300 ppm or above.

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