TW202116630A - Resin container and connected body of resin containers - Google Patents

Abstract

Provided in the present invention is a resin container including a container body that has an inner wall surface including cyclic olefin copolymer, wherein the container body has a nozzle having a diameter on its upstream side of 0.5 mm or more and 8.0 mm or less.

Description

Resin container and resin container connection body

The present invention relates to a resin container. In more detail, the present invention relates to a resin container including a resin container body for storing a liquid container, and a resin container coupling body including a plurality of coupling bodies formed by connecting the resin containers.

In the past, various resin containers have been widely used in order to store liquid containers. As such a resin container, the following resin container is known, which is provided with: a main body part which accommodates a liquid container; and a neck part which is connected to the main body part and has a small diameter; and at the front end of the neck part It is provided with a spout for taking out the liquid container to the outside (refer to Patent Document 1 below). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2000-238847

[The problem to be solved by the invention]

In a resin container constructed in a way that the liquid container is taken out to the outside through a neck with a smaller diameter than the main body, the liquid container enters the neck during storage, even if the spout is turned upwards. There are cases where the liquid container will not fall from the neck and form a effusion. If the resin container in this state is opened, the accumulated liquid content may be splashed to the outside at the same time as the opening. Therefore, the present invention aims to solve such a problem as a subject, and to provide a resin container that is hard to generate liquid accumulation, and a resin container coupling body provided with a coupling body formed by connecting a plurality of resin containers. [Technical means to solve the problem]

The present invention for solving the above-mentioned problems provides a resin container comprising a container body made of resin, the container body accommodating a liquid container and having an injection port, the container body having a main body for accommodating the liquid container, and The diameter of the injection port of the container body is smaller than that of the main body, the inner wall surface of the container body that is in contact with the liquid container contains a cyclic olefin copolymer, and the flow of the liquid container on the upstream side of the injection port The diameter of at least a part of the road is 0.5 mm or more and 8.0 mm or less.

Hereinafter, embodiments of the resin container of the present invention will be described with reference to the drawings. In the following, a case where a plurality of resin containers are connected to form a connected body will be described as an example of the embodiment of the present invention. FIG. 1 is a diagram showing a connected body 100 formed by connecting five resin containers 1. As also shown in the figure, the resin container 1 of the present embodiment includes a container body 10 having a container 11 for storing a liquid container C, and an injection port 12 for the liquid container C.

The resin container 1 in this embodiment further includes a resin lid 20 as shown in FIGS. 1 to 5. The lid 20 closes the discharge port 12 of the container body 10 and seals the container body 10. The resin container 1 in the present embodiment is configured such that the lid body 20 and the container body 10 are integrally formed, and when the lid body 20 is broken from the container body 10, the injection port 12 is formed. That is, the resin container 1 in this embodiment can be unsealed by breaking the lid 20 and the container body 10 and removing the lid 20 from the container body 10.

In this embodiment, a plurality of resin containers 1 including the container body 10 and the lid body 20 are connected to form the connected body 100. In the connecting body 100 of the present embodiment, the plurality of container bodies 10 arranged in such a way that the opening direction of the spout 12 faces upward are arranged in a row and are arranged side by side, and two adjacent to each other in the direction of side by side The resin container 1 has a connection part which connects these. That is, in the above-mentioned connected body 100, a plurality of resin containers 1 are connected to each other by the above-mentioned connecting portion provided at the respective side edge portions. The above-mentioned connecting portion may be a point-shaped connection of adjacent container bodies 10, or a line-shaped connection of adjacent container bodies 10. Alternatively, the above-mentioned connecting portion may be a point-shaped connection of adjacent cover bodies 20, or a line-shaped connection of adjacent cover bodies 20. That is, the connection state in the above-mentioned connecting portion is not particularly limited. In the above-mentioned connecting body 100 exemplified in this embodiment, the container body 10 is connected to each other by the connecting portions 31 and 32 extending vertically along the side edge of the container body 10. In this embodiment, not only is each resin container 1 provided with the container body 10 and the lid 20 as an integrally molded product, but the connected body 100 is also an integrally molded product, and the connecting portions 31 and 32 can be broken. , And separate the plural resin containers 1 one by one.

As for the container body 10 of this embodiment, the internal volume of the container body 10 in a state sealed by the lid 20 is not particularly limited, for example, at normal temperature (for example, 23°C) and normal pressure (for example, 1.0 atm) Can be set to an internal volume below 10 mL. In this embodiment, the above-mentioned internal volume can be set to 8 mL or less, 6 mL or less, or 4 mL or less. The above internal volume can be set to 0.1 mL or more, or 0.2 mL or more. The above-mentioned internal volume may be 0.3 mL or more, or 0.4 mL or more. The volume of the container body 10 is more preferably not less than 0.1 mL and not more than 10 mL. When a part of the liquid container C formed by the effusion leaks during opening, even if the absolute amount of the loss is small, when the resin container has a small capacity, the overall loss ratio is relatively large. Therefore, it is preferable that the resin container 1 has a volume as described above in terms of more remarkably exerting the effects of the present invention. The above-mentioned receiving portion 11 of the container body 10 in this embodiment has a bottomed cylindrical shape. Specifically, the container body 10 in this embodiment includes: a cylindrical main body portion 10a; a shoulder portion 10b connected to the upper end of the main body portion 10a; and a neck portion 10c connected to the upper end of the shoulder portion 10b; And it is comprised so that the said injection port 12 may open upwards on the upper end surface of this neck part 10c. The main body 10a has a cylindrical shape with a substantially constant cross-sectional shape (inner diameter) when cut in a horizontal plane. The above-mentioned shoulder 10b is formed such that the cross-sectional shape (inner diameter) when cut in a horizontal plane decreases in diameter as it goes upward.

The container main body 10 of the present embodiment has a neck portion 10c extending upward from the upper end of the shoulder portion 10b in a cylindrical shape having a diameter smaller than that of the main body portion 10a. Regarding the resin container 1 of this embodiment, the container body 10 with the lid 20 removed and the container body 10 in an unsealed state is turned upside down with the spout 12 facing downward, and the accommodating portion 11 etc. are sandwiched by fingertips from the front and back. The accommodating portion 11 applies pressure to inject the liquid accommodating material C from the injection port 12, so that the liquid accommodating material C can be taken out. The resin container 1 exemplified in this embodiment is a drip container in which the liquid container C is dripped from the injection port 12 in an unsealed state. The container body 10 of the present embodiment has a neck 10c, so that the entire amount of the liquid container C is prevented from dripping from the injection port 12 due to its own weight when facing downward. Furthermore, since the container body 10 of this embodiment has excellent flexibility, the pressure applied can be easily adjusted to adjust the amount of the liquid container C dropped from the injection port 12.

The neck portion 10c in this embodiment forms a flow of the liquid container C on the upstream side of the injection port 12 when the liquid container C accommodated in the main body portion 10a is injected to the outside through the injection port 12 road. In terms of preventing the liquid container C from entering the neck 10c unexpectedly and forming effusion, the neck 10c is preferably formed so that the inner diameter (the diameter of the flow path of the liquid container C) becomes 0.5 mm or more and 8.0 Any one within the range below mm. The above-mentioned inner diameter is more preferably 0.7 mm or more, still more preferably 0.9 mm or more, and particularly preferably 1.0 mm or more. The above inner diameter can also be 7.5 mm or less, 7.0 mm or less, 6.5 mm or less, 6.0 mm or less, 5.5 mm or less, 5.0 mm or less, 4.5 mm or less, 4.0 mm or less, 3.5 mm or less, 3.0 mm or less, more preferably 2.8 mm or less, more preferably 2.5 mm or less, still more preferably 2.0 mm or less, and particularly preferably 1.8 mm or less.

The resin container 1 exemplified in this embodiment has a neck portion 10c as described above, and it is preferable that at least a part of the flow path of the liquid container C on the upstream side of the injection port 12 has the above-mentioned diameter The same is true for the resin container 1x without neck as shown in Fig. 6. The resin container 1x shown in FIG. 6 is also common to the resin container 1 shown in FIGS. 1 to 5 in the following respects, that is, it has a container body 10x having an injection port 12x, and the container body is blocked by blocking the injection port 12x. The aspect of the lid body 20x in the sealed state and the aspect of the container body 10x have aspects such as the holding portion 14x described later. On the other hand, the resin container 1x shown in Fig. 6 is different from the resin container 1 shown in Figs. 1 to 5 in that the injection port 12x is at the upper end of the shoulder 10bx connected to the upper part of the main body 10ax. The aspect of opening. However, the following aspects are common to the resin container 1 shown in FIGS. 1 to 5, that is, by the upstream of the flow direction of the liquid container C when the liquid container C is extracted from the injection port 12 The side has a specific diameter to prevent the formation of effusion. Specifically, the following points are common to the resin container 1 shown in FIGS. 1 to 5, that is, through the shoulder 10bx that becomes the flow path of the liquid container C on the upstream side of the injection port 12 At the upper end, the inner diameter is set within the above-mentioned range (for example, 0.5 mm to 8.0 mm) before reaching the injection port 12, so that the formation of effusion can be suppressed.

_{The internal cross-sectional area (S 0} ) of the main body portion 10 a associated with the formation of the effusion _{and the cross-sectional area (S 1} ) of the flow path at the portion having the diameter as described above are preferably specific areas. The internal cross-sectional area (S ₀ ) of the main body portion 10a (the area of the inner side of the inner wall when cut in a horizontal plane) is preferably 20 mm ² or more, more preferably 25 mm ² or more, and particularly preferably 30 mm ² or more. The aforementioned internal cross-sectional area (S ₀ ) can be 300 mm ² or less, 260 mm ² or less, 220 mm ² or less, 180 mm ² or less, preferably 140 mm ² or less, more preferably 120 mm ² or less, especially 100 mm ² or less. Sectional area of the inner cross-sectional area of the main body portion 10a ₍₀ S) from the flow path of (S ₁₎ of the ratio (S ₀ / S ₁₎ is preferably 1.5 or more, more preferably 2 or more, and further preferably It is 5 or more, particularly preferably 10 or more. The above-mentioned (S ₀ /S ₁ ) is preferably 60 or less, more preferably 50 or less, still more preferably 40 or less, and particularly preferably 30 or less.

The main body part 10a of this embodiment does not need to be cylindrical as in the above-mentioned example. In this case, the main body is preferably formed as a part compressed with a fingertip when the liquid container is poured. The portion with the largest diameter has the internal cross-sectional area (S ₀ ) as described above, and is preferably formed as a height The central part in the direction becomes the internal cross-sectional area (S ₀ ) as described above.

Regarding the inner diameter (flow path diameter) of the neck portion 10c, it can usually be obtained when the neck portion 10c is cut in a plane orthogonal to the flow direction of the liquid container C, which is defined by the inner surface of the neck portion 10c. For the cross-sectional area of the figure, find the diameter of a circle having the same area as the cross-sectional area. Regarding the above-mentioned inner diameter, the resin container 1x shown in Fig. 6 can also be obtained in the same way. The flow path can be obtained by obtaining the cross-sectional area of the upper end of the shoulder 10bx instead of the cross-sectional area of the neck. diameter.

The neck portion 10c preferably has a length of 0.5 mm or more and 12 mm or less with a portion having a preferable inner diameter as described above. The above-mentioned length is more preferably 0.7 mm or more, and still more preferably 0.9 mm or more. The above-mentioned length is more preferably 10 mm or less, and still more preferably 8 mm or less.

The container body 10 of this embodiment further has a holding portion 14 extending downward from the lower end of the receiving portion 11 in a hollow rectangular plate shape. In more detail, in the container body 10 of the present embodiment, above the hollow plate-shaped holding portion 14 in the shape of a longitudinal rectangle in front view, there is a storage space in the shape of a bottle as described above. Furthermore, in the container body 10 of the present embodiment, the portion that can contain the liquid container C is only the bottle-shaped portion, and the hollow portion of the holding portion 14 does not communicate with the internal space of the container 11 but becomes Space of isolation. Here, the internal volume of the container body 10 refers to the volume of the portion capable of accommodating the liquid container C, and does not include the volume of the hollow portion of the holding portion 14.

As described above, in this embodiment, since the holding portion 14 having a rectangular plate shape is provided, the holding portion 14 can display information such as the product name and the expiration date. Furthermore, when it is desired to ensure that the receiving portion 11 has a larger volume, the holding portion 14 can be reduced or omitted as needed.

The above-mentioned connecting body 100 in this embodiment is formed by connecting adjacent resin containers 1 to each other by a first connecting portion 31 and a second connecting portion 32, and connecting five resin containers 1. The first connecting portion 31 The side edges of the main body portion 10a are connected so that the connecting area becomes a line extending vertically, and the second connecting portion 32 connects the side edges of the holding portion 14 so that the connecting area becomes a line extending up and down. The connected body 100 in this embodiment is a molded article using the blow-fill-seal method as described later. Therefore, the above-mentioned resin container 1 in this embodiment can suppress the mixing of foreign matter when the liquid container C is accommodated in the accommodating portion 11. In addition, the resin container 1 in this embodiment is used as a single-dose container with a relatively small storage capacity of the liquid container C as described above.

When taking out the liquid container C from the resin container 1, the following procedure is sufficient: As shown in FIG. 2, first, the first connecting portion 31 and the second connecting portion 32 of the above-mentioned connecting body 100 are connected to each other. The part is broken, and one resin container 1 is taken out from the above-mentioned connected body 100, and then, from the resin container 1 taken out from the connected body 100, the lid 20 is removed as shown in FIG. 5, and the container body 10 is brought into an unsealed state.

The connected body 100 of the present embodiment can apply force to pull the adjacent resin container 1 away without using tools such as scissors or a cutting knife, so that the connecting portions 31 and 32 can be broken only by hand force. In addition, in the resin container 1 of the present embodiment, the container body 10 and the lid body 20 may be broken by tearing them by hand without using a tool. Previously, when a resin container was broken from the connected body, the connecting portions 31' and 32' after the fracture were prone to form saw-blade-like concavities and convexities, and burrs were prone to form on the periphery of the injection port. The irregularities of the connection portions 31' and 32' after the fracture may adversely affect the touch when holding the resin container. In addition, the burrs on the periphery of the injection port may hinder the normal dripping of the droplets of the liquid container that should be dripped by gravity. However, in this embodiment, since the resin container 1 is made of a specific material, it is possible to suppress the above-mentioned problems.

In the present embodiment, as shown in FIGS. 7, 8, and 9, the container body 10 has a multilayer structure having a first innermost layer in contact with the liquid container C. The layer L1 and the second layer L2 that is in contact with the first layer L1 from the outside, the first layer L1 includes a cyclic olefin copolymer (COC) and a linear low-density polyethylene resin (PE-LLD), The second layer contains low-density polyethylene resin (PE-LD).

In the container body 10 containing the liquid container C, by including the cyclic olefin copolymer (COC) in the first layer L1 constituting the inner wall surface, the liquid container C can be properly wetted . Furthermore, by the above-mentioned structure and the neck 10c having an appropriate inner diameter, in the present embodiment, the formation of fluid accumulation in the neck 10c is suppressed. In the present embodiment, since the second layer is in contact with the first layer L1 from the outside, even if the thickness of the first layer L1 is reduced, the container body 10 can be formed by the second layer L2. The total thickness is set to a certain value or more. Therefore, in this embodiment, it is possible to ensure the thickness of the container capable of suppressing liquid leakage from the container body 10 due to pinholes or the like.

In this embodiment, PE-LD is included in the second layer L2, thereby allowing the container body 10 to exhibit flexibility. Furthermore, in this embodiment, since COC and PE-LLD are contained in the first layer L1, compared with the case without PE-LLD, the first layer L1 and the second layer L2 can be separated from each other. Improved affinity. Therefore, when the first layer L1 and the second layer L2 are thermally welded to integrate the build-up layers, excellent adhesiveness is exhibited between the layers, and the occurrence of interlayer peeling between the layers can be suppressed.

It is generally known that when a polyethylene resin sheet is torn, linear burrs (protrusions) are easily formed on the fractured surface. If the resin container 1 of this embodiment is formed only by polyethylene resin, it may be damaged after the fracture. The portion corresponding to the peripheral portion of the connecting portion 31', 32' or the spout port 12 may form a burr. However, in this embodiment, by providing the container body 10 with a two-layer structure using resin as described above, the saw-blade-like concavities and convexities of the connection portions 31' and 32' after the fracture can be formed or formed on The formation height of burrs on the peripheral edge of the injection port 12 is suppressed to a low level.

The PE-LLD contained in the first layer L1 can be made of ethylene as the main monomer and α-olefin with a carbon number of 4 or more (such as 1-butene, 1-hexene, 1-octene, 4 -Methylpentene-1, etc.) is the usual PE-LLD of comonomers. From the viewpoint of more remarkably exerting the effects of the present invention, the PE-LLD preferably contains 1-hexene or 1-octene as a comonomer, and more preferably contains 1-hexene as a comonomer.

In the above-mentioned PE-LLD, it is preferable to introduce short-chain branches into the molecular structure through the above-mentioned comonomer to reduce the crystallinity and achieve a low density. The above-mentioned short-chain branch is preferably introduced at a ratio of 5 or more and 100 or less per 1000 units of the structural unit of ethylene, and more preferably introduced at a ratio of 10 or more and 50 or less. That is, the above-mentioned PE-LLD preferably has a ratio of the above-mentioned comonomer in the total amount of ethylene in the range of 0.5 mol% or more and 10 mol% or less, and more preferably the above-mentioned ratio becomes 1 mol% or more and 5 mol%. Within the following range. Furthermore, the above-mentioned PE-LLD preferably has a density of 910 kg/m ³ or more, and more preferably has a density of 915 kg/m ³ or more. The density of the above-mentioned PE-LLD is preferably 930 kg/m ³ or less. The melt mass flow rate (MFR) of the above-mentioned PE-LLD is preferably 0.5 g/10 min or more, more preferably 0.6 g/10 min or more. The above-mentioned melt mass flow rate is preferably 5.0 g/10 min or less, more preferably 4.0 g/10 min or less, and still more preferably 3.0 g/10 min or less.

The melt mass flow rate of the above-mentioned PE-LLD and the above-mentioned PE-LD can be based on JIS K7210: 2014 "Plastic-Thermoplastic Melt Mass Flow Rate (MFR) and Melt Volume Flow Rate (MVR) Determination Method-Part 1 : It can be determined by the method A (mass measurement method) described in "Standard Test Method", and it can be determined under the conditions of a temperature of 190°C and a notarized load of 2.16 kg. Similarly, the melt mass flow rate of COC can be calculated under the conditions of a temperature of 260°C and a notarized load of 2.16 kg.

The above-mentioned PE-LLD can be a polymer using a multi-site catalyst such as Ziegler-Natta catalyst, or a polymer using a single-site catalyst such as a metallocene catalyst.

The above-mentioned first layer L1 of this embodiment may contain not only one type of PE-LLD, but also two or more types of PE-LLD.

The COC contained in the above-mentioned PE-LLD and the above-mentioned first layer L1 is formed by the addition copolymerization of one or more kinds of norene-based monomers with ethylene by a known method, or according to Those obtained by hydrogenation in a conventional method are specifically those having a structure represented by the following general formula (1).

[化1]

^{(Here, R 1} and R ² in formula (1) are the same or different and represent hydrogen, a hydrocarbon residue, or any polar group of halogen, ester group, nitrile group, and pyridyl group. R ¹ and R ² may also be Mutual bonding to form a ring. x and z are integers of 1 or more, y is an integer of 0 or more)

The glass transition temperature (Tg) of the COC is preferably 60°C or higher, more preferably 63°C or higher, and preferably 65°C or higher, and still more preferably 67°C or higher. The glass transition temperature (Tg) is preferably 130°C or lower, more preferably 120°C or lower, and preferably 110°C or lower, further preferably 100°C or lower, and particularly preferably 90°C or lower. In addition, the so-called "glass transition temperature (Tg)" in this manual, unless otherwise specified, means that the midpoint glass transition is specified by measuring in accordance with JIS K7121 at a heating rate of 10°C/min. temperature. When two or more COCs are used, the Tg of the COC is specified as the weighted average of each cyclic olefin resin.

In consideration of the moldability of the resin container 1, the ratio of the structural unit derived from the norene-based monomer in the COC is preferably 70% by mass or less. The above-mentioned ratio is more preferably 68% by mass or less, still more preferably 66% by mass or less, and particularly preferably 64% by mass or less. The above-mentioned ratio is preferably 15% by mass or more, more preferably 18% by mass or more, still more preferably 20% by mass or more, and particularly preferably 22% by mass or more.

As specific examples of the polymer having the structural unit represented by the above general formula (1), the trade name "APEL (registered trademark)" manufactured by Mitsui Chemicals Co., Ltd. and the trade name "Topas (registered trademark)" manufactured by Advanced Polymers GmbH can be cited. Trademark)” and so on.

From the viewpoints of formability and mechanical properties of molded products, the melt flow rate (MFR (260°C, 2.16 kg)) of the aforementioned COC is preferably 10 g/10 min or more and 40 g/10 min or less.

The above-mentioned first layer L1 is preferably prepared by blending COC and PE-LLD in such a way that the glass transition temperature of 60°C or more and 130°C or less is displayed when the glass transition temperature is measured. The glass transition temperature (Tg) is preferably 60°C or higher, more preferably 63°C or higher, and preferably 65°C or higher, and still more preferably 67°C or higher. The glass transition temperature (Tg) is preferably 130°C or lower, more preferably 120°C or lower, and preferably 110°C or lower, further preferably 100°C or lower, and particularly preferably 90°C or lower.

The content of COC in the first layer is preferably more than 50% by mass, more preferably 55% by mass or more, and particularly preferably 60% by mass or more. The content of COC in the first layer is preferably 95% by mass or less, more preferably 90% by mass or less, and particularly preferably 85% by mass or less.

The first layer of this embodiment contains more COC than PE-LLD. The ratio of COC contained in the first layer L1 to the total amount of COC and PE-LLD is preferably more than 50% by mass, more preferably 55% by mass or more, and still more preferably 60% by mass or more. The above-mentioned ratio is preferably 95% by mass or less, more preferably 90% by mass or less, and still more preferably 85% by mass or less. In other words, the ratio of the PE-LLD in the first layer L1 to the total amount of COC and PE-LLD is preferably more than 5% by mass and less than 50% by mass.

The resin container 1 of the present embodiment is formed by blow molding, and more specifically, is formed by the blow-fill-seal method. Therefore, the resin container 1 can be produced, for example, by blowing air into a high-temperature parison of the second layer L2 on the outside, and pressing the parison from the inside to the outside against a molding die.

Furthermore, in addition to COC or PE-LLD, the above-mentioned first layer L1 may also contain additive components (rubber/plastic additives, fillers and other fillers, antioxidants, other resins, etc.), and its content is preferably set to 5 mass % Or less, more preferably 3% by mass or less, and still more preferably 1% by mass or less. It is particularly preferable that the first layer L1 is substantially composed of only COC and PE-LLD.

The second layer L2 for forming the container body 10 together with the first layer L1 and in contact with the first layer L1 from the outside includes PE-LD. The density of the PE-LD forming the second layer L2 is preferably 910 kg/m ³ or more and 930 kg/m ³ or less, and more preferably 915 kg/m ³ or more and 925 kg/m ³ or less.

PE-LD preferably has a fluffy molecular structure as described above, and there are more cross-links of molecular chains. Specifically, the PE-LD forming the second layer L2 preferably has long-chain branches in the molecular structure of the polymer obtained by the high-pressure polymerization method. The MFR (190°C, 2.16 kg) of PE-LD is preferably 1.5 g/10 min or less, and preferably 1.3 g/10 min or less, more preferably 1.1 g/10 min or less, and particularly preferably 1.0 g/ Less than 10 min. The MFR of PE-LD is preferably 0.1 g/10 min or more, more preferably 0.2 g/10 min or more, and still more preferably 0.3 g/10 min or more.

Furthermore, in addition to PE-LD, the above-mentioned second layer L2 may also contain additives (rubber/plastic additives, fillers and other fillers, antioxidants, colorants, other resins, etc.) if it is a small amount, and its content is better It is 5 mass% or less, More preferably, it is 3 mass% or less, More preferably, it is 1 mass% or less. It is particularly preferable that the second layer L2 is substantially composed of PE-LD only.

Although the thicknesses of the first layer L1 and the second layer L2 vary depending on the use of the resin container 1, etc., if it is the liquid container C in the container 11 as illustrated in this embodiment A small container with a capacity of 10 mL or less is preferably set so that the total thickness of the two becomes 0.15 mm or more and 1 mm or less. Furthermore, the above-mentioned receiving portion 11 is preferably thinner and easy to deform in terms of helping the liquid container C to be taken out from the injection port 12 by increasing the internal pressure in the container, and on the other hand, it is preferably not The method of risk of damage has a certain thickness or more. The total thickness (t1+t2) of the thickness (t1) of the first layer L1 and the thickness (t2) of the second layer L2 is at least in the portion of the storage portion 11 that constitutes the storage space of the liquid storage object C, preferably 0.2 mm or more, more preferably 0.24 mm or more, and still more preferably 0.28 mm or more. The total thickness (t1+t2) is preferably 0.8 mm or less, more preferably 0.7 mm or less, and still more preferably 0.6 mm or less.

The thickness (t1) of the first layer L1 is preferably 0.05 mm or more and 0.4 mm or less, more preferably 0.1 mm or more and 0.35 mm or less, and still more preferably 0.15 mm or more and 0.30 mm or less. The thickness (t2) of the second layer L2 is preferably 0.1 mm or more and 0.6 mm or less, more preferably 0.1 mm or more and 0.55 mm or less, and still more preferably 0.15 mm or more and 0.5 mm or less.

The liquid container C contained in the container 11 is not particularly limited as long as it has fluidity, and examples include foods and beverages (beverages, seasonings, internal medicines, nutrients, etc.), external agents (skin care agents, Hair care agents, cosmetics and other cosmetics, eye drops, ophthalmic compositions such as contact lens agents, nose drops, disinfectants, mouthwashes, repellents, etc.), functional agents (lotions, softeners, etc.) , Fragrances, deodorants, adhesives, etc.) and so on.

Among the above-mentioned liquid container C, the ophthalmic composition is suitable as the liquid container C contained in the resin container 1 of this embodiment in terms of requiring dripping of an appropriate amount. Examples of the ophthalmic composition contained in the resin container 1 include eye drops, eye drops for contact lenses, artificial tears, eye washes (synonymous with eye washes or eye washes), contact lens wearers, and contact lenses. Glasses care products (including disinfectants, preservatives, cleaning agents, etc.), etc.

Regarding the resin container 1 of the present embodiment, the resin container 1 can be produced by the "blow-fill-seal method" for storing the liquid container C as described above. If a specific example is given, the resin container (connected body) of this embodiment can be manufactured as follows. (1) Blow molding step To produce a parison with a two-layer structure extruded in the following way, that is, the raw materials used to form the first layer (cyclic olefin copolymer (COC), linear low-density polyethylene resin (PE-LLD)) are melted The molten kneaded product obtained by kneading becomes the inner side, and the raw material used to form the second layer (low density polyethylene (PE-LD)) is melted and kneaded and the molten kneaded product obtained becomes the outer side; The mold cavity corresponding to the above-mentioned connecting body is constructed by clamping the parison in the parison, and air is injected into the parison, or the parison is sucked by a vacuum hole provided on the forming surface of the parison. Either or both, the shape of each part, such as a receiving part or a holding part, is provided in the parison. However, at this point in time, the lid was not formed, and a connected body in which the injection port of each resin container was opened was produced. (2) Filling step The nozzle is inserted through the injection port and inserted into the inside of the accommodating part of each resin container, and the liquid content is allowed to flow out of the nozzle by a specific amount, so that the liquid content is accommodated in the accommodating part. (3) Sealing step After accommodating a specific amount of liquid contents in the accommodating portion, a lid portion is formed so as to block the injection port.

Furthermore, the connecting body of this embodiment can also be produced by a method other than the above-mentioned method. In addition, in the present embodiment, it is illustrated that the resin container is produced in the state of the connected body, but the resin container does not need to be produced to constitute the connected body. Furthermore, in this embodiment, although the connection body or each resin container exemplified those having a specific shape, the resin container of the present invention is not limited to such exemplified ones. For example, in this embodiment, a case where the resin container has a two-layer structure is illustrated, but the resin container of the present invention may have a multilayer structure with three or more layers, that is, it may have other functions outside the second layer. Layer (anti-gas permeation layer, waterproof vapor permeation layer, anti-light permeation layer, anti-containment layer). In this way, the present invention is not limited at all by the above-mentioned examples.

The resin container of this embodiment is configured as described above, and therefore has the following advantages.

That is, the resin container of the present embodiment is provided with a resin container body which contains a liquid container and has a spout port, the container body has a main body for storing the liquid container, and the container body has a spout port. The diameter is smaller than that of the main body, the inner wall surface of the container body that is in contact with the liquid container contains a cyclic olefin copolymer, and the diameter of at least a part of the flow path of the liquid container on the upstream side of the injection port It is 0.5 mm or more and 8.0 mm or less.

With the resin container of this embodiment, it is difficult to form liquid accumulation.

In addition, the resin container of this invention is not limited to the said embodiment. In addition, the resin container of the present invention is not limited by the above-mentioned effects. The resin container of the present invention can be variously modified without departing from the gist of the present invention. [Example]

Next, the present invention will be explained in more detail with examples, but the present invention is not limited to these.

A resin container as a connected body as shown in Fig. 1 was produced, and the evaluation on the accumulation of fluid in the neck was carried out. In addition, the raw materials used for these evaluations are as follows.

<Test material> COC1: Cyclic olefin copolymer (glass transition temperature 78°C, density 1010 kg/m ³ , melt flow rate 32 g/10 min (260°C), trade name "TOPAS8007S" (Polyplastic Co., Ltd. Manufacturing)) COC2: Cyclic olefin copolymer (glass transition temperature 80°C, density 1020 kg/m ³ , melt flow rate 30 g/10 min (260°C), trade name "APEL APL6509T" (Mitsui Chemical Co., Ltd. Manufacturing)) PE-LLD: straight-chain low-density polyethylene (density 920 kg/m ³ , melt flow rate 0.95 g/10 min (190°C)) PE-LD: low-density polyethylene (density 922 kg/m ^{3. The} melt flow rate is 0.60 g/10 min (190℃))

＜Evaluation＞ A resin container with the following two-layer structure was produced. The two-layer structure had a first layer (inner layer) containing a cyclic olefin copolymer and a linear low-density polyethylene at the blending ratio (%) shown in Table 1. And the second layer (outer layer) containing low-density polyethylene. In addition, a resin container with a two-layer structure including a first layer (inner layer) containing low-density polyethylene and a second layer (outer layer) containing low-density polyethylene was produced. The resin container is produced by the blow-fill-seal method so as to become a connected body formed by connecting five resin containers. Unscrew the lid of the resin container to make the opening. Prepare a buffer solution (containing 0.6% by mass of sodium hydrogen phosphate and 0.07% by mass of sodium dihydrogen phosphate), and squeeze the receiving part with the opening of the resin container facing downwards to slightly discharge the air inside so that the opening is in contact The liquid level of the buffer solution slows down the force of squeezing the receiving part, thereby sucking the buffer solution from the opening part. Adjust the force of squeezing the receiving portion in such a way that the amount of buffer solution becomes the amount that fills the neck of the container. Next, fix the container with the opening facing upward, and measure the time (time A) until the liquid level of the opening drops by 10% of the length of the neck. Measure the amount of buffer in the neck at time A. For the resin container of each test example, the buffer solution was similarly sucked, and the amount of the buffer solution in the neck at the time A elapsed from when the container was fixed with the opening facing upward was measured. Calculate the improvement degree of the residual liquid in the neck according to formula 1. [Formula 1] Residual improvement degree (%) = {1-(the amount of liquid in the neck of the container of the embodiment/the amount of liquid in the neck of the container without COC)}×100 The container of each test example was measured 5 times, and the average of the degree of residual improvement was taken as the degree of residual improvement of the test example. The results of the evaluation based on the evaluation criteria are shown in the table. ◎: The residual improvement degree is more than 30% ○: The degree of residual improvement is more than 20% and less than 30% △: The degree of residual improvement is less than 20%

[Table 1] Comparative example 1-1 Example 1-1 Example 2-1 Example 3-1 Example 4-1 Example 5-1 Inner layer COC1 - 60 70 80 90 97 PE-LLD - 40 30 20 10 3 PE-LD 100 - - - - - Outer layer PE-LD 100 100 100 100 100 100 Inner diameter of neck (mm) 1.5 1.5 1.5 1.5 1.5 1.5 Residual improvement - 〇 〇 ◎ ◎ ◎ Comparative example 2-1 Example 6-1 Example 7-1 Example 8-1 Example 9-1 Inner layer COC1 - 60 70 80 90 PE-LLD - 40 30 20 10 PE-LD 100 - - - - Outer layer PE-LD 100 100 100 100 100 Inner diameter of neck (mm) 2.0 2.0 2.0 2.0 2.0 Residual improvement - ◎ ◎ ◎ ◎ Comparative example 3-1 Example 10-1 Comparative example 4-1 Example 11-1 Inner layer COC1 - 60 - 60 PE-LLD - 40 - 40 PE-LD 100 - 100 - Outer layer PE-LD 100 100 100 100 Inner diameter of neck (mm) 3.5 3.5 5.0 5.0 Residual improvement - ◎ - ◎ Comparative example 1-2 Example 1-2 Example 2-2 Example 3-2 Example 4-2 Example 5-2 Inner layer COC2 - 60 70 80 90 97 PE-LLD - 40 30 20 10 3 PE-LD 100 - - - - - Outer layer PE-LD 100 100 100 100 100 100 Inner diameter of neck (mm) 1.5 1.5 1.5 1.5 1.5 1.5 Residual improvement - 〇 〇 ◎ ◎ ◎ Comparative example 2-2 Example 6-2 Example 7-2 Example 8-2 Example 9-2 Inner layer COC2 - 60 70 80 90 PE-LLD - 40 30 20 10 PE-LD 100 - - - - Outer layer PE-LD 100 100 100 100 100 Inner diameter of neck (mm) 2.0 2.0 2.0 2.0 2.0 Residual improvement - ◎ ◎ ◎ ◎ Comparative example 3-2 Example 10-2 Comparative example 4-2 Example 11-2 Inner layer COC2 - 60 - 60 PE-LLD - 40 - 40 PE-LD 100 - 100 - Outer layer PE-LD 100 100 100 100 Inner diameter of neck (mm) 3.5 3.5 5.0 5.0 Residual improvement - ◎ - ◎

From the above, it can be seen that the resin container of the present invention is unlikely to cause effusion in the neck.

1. 1x: resin container 10, 10x: container body 10a, 10ax: main body 10b, 10bx: shoulder 10c: neck 11: receiving part 12, 12x: injection port 14, 14x: holding part 20, 20x: cover 31, 32: connecting portion 31 ', 32': the connector portion 100 of the rupture: connecting body C: liquid storage material L1: layer 1 L2: layer 2 S _0, S _1: cross-sectional areas t1, t2 :thickness

Fig. 1 is a front view showing a connected body in which a plurality of resin containers having a container body and a lid are connected. Fig. 2 is a front view showing a state in which a resin container equipped with a container body and a lid body is separated from the connected body. Fig. 3 is a front view showing the resin container in a state separated from the connected body. Fig. 4 is a side view showing the state of the resin container in a state separated from the connecting body. Fig. 5 is a front view showing the state of unsealing the resin container. Fig. 6 is a front view showing the state of unsealing the resin container of another embodiment. Fig. 7 is a cross-sectional view showing the cross section of Fig. 5 taken along the arrow direction of line VII-VII. Fig. 8 is an enlarged cross-sectional view showing the cross section (cross section of the main body) of Fig. 7 taken along the arrow direction of the line IIX-IIX. Fig. 9 is an enlarged cross-sectional view showing the cross section (neck cross section) of Fig. 7 taken along the arrow direction of line IX-IX.

1: Resin container

10: Container body

11: Containment Department

12: Injection

14: Holding part

20: Lid

31, 32: Connection part

100: Concatenation

C: Liquid container

Claims (8)

A resin container is provided with a container body made of resin, the container body accommodating a liquid container and having an injection port, The container body has a main body for accommodating the liquid container, The diameter of the injection port of the container body is smaller than that of the body part, The inner wall surface of the container body which is in contact with the liquid container contains a cyclic olefin copolymer, The diameter of at least a part of the flow path of the liquid container on the upstream side of the injection port is 0.5 mm or more and 8.0 mm or less. The resin container according to claim 1, wherein the ratio of the cyclic olefin copolymer in the resin constituting the inner wall surface is 55% by mass or more and 98% by mass or less. The resin container of claim 1 or 2, which further contains a linear low-density polyethylene resin on the inner wall surface. The resin container according to any one of claims 1 to 3, wherein the internal cross-sectional area (S ₀ ) of the main body part is 20 mm ² or more and 300 mm ² or less. Item 4 The resin container of the request, wherein the inner cross-sectional area of the sectional area of the main body portion ₍₀ S) from the flow path of (S ₁₎ of the ratio (S ₀ / S ₁₎ of 1.5 or more and 60 or less. The resin container of any one of claims 1 to 5, wherein the volume of the container body is 0.1 mL or more and 10 mL or less. The resin container according to any one of claims 1 to 6, wherein the liquid container is an external preparation. A resin container connection body, comprising a connection body formed by connecting a plurality of the above-mentioned container bodies of the resin container according to any one of claims 1 to 7, and In the above-mentioned connecting body, a plurality of the above-mentioned container bodies arranged so that the opening direction of the above-mentioned spout is facing upwards is arranged side by side, and adjacent resin containers are connected to each other by connecting parts provided on the side edges, The said connected body is an integrally molded object, and can be separated into each said resin container by breaking the said connection part.

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