Resin container and resin container connection body

Abstract

The present invention is a resin container having a multilayer structure, wherein the multilayer structure comprises a first layer in contact with liquid contents and a second layer in contact with the first layer from the outside, wherein the first layer comprises a cyclic olefin copolymer and a linear low-density polyethylene resin, and the second layer comprises a low-density polyethylene resin.

Description

Technical Field

[0001] The present invention relates to a resin container and a resin container connection body. More specifically, the present invention relates to a resin container having a storage portion for storing liquid contents, and a resin container connection body having a connection body formed by connecting a plurality of the resin containers. Background Art

[0002] Conventionally, various resin containers have been widely used to contain liquid contents.

[0003] As such resin containers, containers such as plastic ampoules for containing medicines in a sealed state are known.

[0004] As such a plastic ampule, a plastic ampule produced by a blow-fill-seal method as described in Patent Document 1 listed below is known.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Re-publication No. 2009 / 131192 Summary of the invention

[0008] Technical Problems to be Solved by the Invention

[0009] As the resin constituting the resin container, a cyclic olefin polymer (COP) obtained by polymerizing a norbornene-based monomer, a cyclic olefin copolymer (COC) which is a copolymer of a norbornene-based monomer and ethylene, and the like are known.

[0010] However, this resin has a high heat deformation temperature and is harder than other olefin resins such as polyethylene resin, so it is difficult to say that its moldability is sufficiently good.

[0011] Furthermore, in a resin container having a spout for taking out liquid contents to the outside, if the spout is simply turned downward to apply pressure due to the liquid contents' own weight, the liquid contents may not be taken out sufficiently well.

[0012] Therefore, it is desirable that the resin container be formed so as to be easily compressively deformed such as to reduce the internal volume and so as to be able to apply pressure to the liquid content from the outside.

[0013] However, since the cyclic olefin polymer container or the cyclic olefin copolymer container is relatively hard as described above, it is difficult to control the removal of the liquid content sufficiently easily.

[0014] In order to solve such a problem, it is conceivable to make the container into a multilayer structure of two or more layers, and to make the outer layer of the container be made of a softer resin than the inner layer.

[0015] However, in a resin container having a multi-layer structure, there is a possibility that a new problem of interlayer delamination may occur.

[0016] Therefore, the technical problem of the present invention is to solve such a problem and provide a resin container from which liquid contents can be easily taken out, and a resin container connection body including a connection body formed by connecting a plurality of such resin containers.

[0017] Technical means to solve technical problems

[0018] The present invention for solving the technical problem provides a resin container, comprising: a container body, which has a storage portion for containing liquid contents and an outlet for pouring the liquid contents; and a cover body, which blocks the outlet and seals the container body, the container body and the cover body are made of resin, and the container body has a multilayer structure, the multilayer structure comprising a first layer as the innermost layer in contact with the liquid contents and a second layer in contact with the first layer from the outside, the first layer comprising a cyclic olefin copolymer and a linear low-density polyethylene resin, and comprising more of the cyclic olefin copolymer than the linear low-density polyethylene resin, and the second layer comprising a low-density polyethylene resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view showing a connected body formed by connecting a plurality of resin containers including container bodies and lid bodies.

[0020] Figure 2 This is a front view showing a state where a resin container including a container body and a lid body is separated from a connected body.

[0021] Figure 3 It is a front view showing the resin container in a state separated from the connected body.

[0022] Figure 4 It is a side view showing the resin container in a state separated from the connected body.

[0023] Figure 5 This is a front view showing a state where the resin container is opened.

[0024] Figure 6 Yes means Figure 5 A cross-sectional view of the section viewed along line VI-VI.

[0025] Figure 7 Yes Figure 6 An enlarged cross-sectional view showing the cross-sectional view taken along line VII-VII. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of the resin container according to the present invention will be described with reference to the drawings.

[0027] Hereinafter, an embodiment of the present invention will be described by taking as an example a case where a plurality of resin containers are connected to form a connected body.

[0028] Figure 1 This is a diagram showing a connected body 100 in which five resin containers 1 are connected.

[0029] Also like Figure 1 As shown, the resin container 1 of the present embodiment includes a container body 10 having a storage portion 11 for storing a liquid content C and an outlet 12 for pouring the liquid content C.

[0030] The resin container 1 in this embodiment is as follows Figure 1 to Figure 5 As shown in the figure, a resin cover 20 is further provided, and the cover 20 blocks the pouring port 12 of the container body 10 to seal the container body 10 .

[0031] The resin container 1 in the present embodiment is configured such that the cover 20 and the container body 10 are integrally molded, and the pouring port 12 appears by breaking the cover 20 from the container body 10 .

[0032] That is, the resin container 1 in the present embodiment can be opened by breaking the lid 20 and the container body 10 and removing the lid 20 from the container body 10 .

[0033] In the present embodiment, a plurality of resin containers 1 including the container body 10 and the lid 20 are connected to form the connected body 100 .

[0034] In the connection body 100 of this embodiment, the plurality of container bodies 10 arranged with the opening direction of the pouring ports 12 facing upward are arranged in a row and laterally arranged, and a connection portion is provided between two adjacent resin containers 1 in the direction of the laterally arranged arrangement.

[0035] That is, in the connection body 100 , the plurality of resin containers 1 are connected to each other via the connection portions provided at the side edges of the respective containers.

[0036] The connecting portion may connect adjacent container bodies 10 in a point shape or in a line shape. Alternatively, the connecting portion may connect adjacent cover bodies 20 in a point shape or in a line shape.

[0037] That is, the connection state in the connection portion is not particularly limited.

[0038] In the connection body 100 illustrated as an example in this embodiment, the container bodies 10 are connected to each other by the connection parts 31 and 32 extending up and down along the side edges of the container bodies 10 .

[0039] In this embodiment, not only are the resin containers 1 including the container body 10 and the cover body 20 integrally formed, but the connecting body 100 is also integrally formed, and the plurality of resin containers 1 can be separated independently one by one by breaking the connecting portions 31 and 32 .

[0040] As for the container body 10 of this embodiment, the internal volume of the container body 10 in the state sealed by the lid body 20 is not particularly limited, for example, the internal volume can be set to less than 10 mL at normal temperature (e.g. 23° C.) and normal pressure (e.g. 1.0 atm).

[0041] The internal volume in this embodiment may be 8 mL or less, 6 mL or less, or 4 mL or less.

[0042] The internal volume may be set to be greater than 0.1 mL, and may be set to be greater than 0.2 mL.

[0043] The internal volume may be 0.3 mL or more, or 0.4 mL or more.

[0044] The internal volume is preferably 0.1 mL or more and 10 mL or less.

[0045] The housing portion 11 of the container body 10 in this embodiment is in the shape of a bottomed cylinder.

[0046] The housing portion 11 includes a bottom portion 11 a constituting a lower end portion in the up-down direction, a constant diameter portion 11 b connected to an upper side of the bottom portion 11 a , and a reduced diameter portion 11 c connected to an upper side of the constant diameter portion 11 b .

[0047] The bottom portion 11a of the present embodiment is a "mortar-shaped" or "bowl-shaped" shape whose diameter decreases toward the lowermost end, and the constant diameter portion 11b is a cylinder whose cross-sectional shape (inner diameter) when cut along a horizontal plane is substantially constant.

[0048] The reduced diameter portion 11 c is formed so that the cross-sectional shape (inner diameter) when cut along a horizontal plane decreases in diameter as it goes upward.

[0049] The container body 10 of the present embodiment includes a nozzle portion 13 extending upward in a cylindrical shape from the upper end of the reduced diameter portion 11 b , and the upper end opening of the nozzle portion 13 serves as the pouring port 12 .

[0050] As for the resin container 1 of the present embodiment, the container body 10 which has been opened by removing the cover 20 is turned upside down with the pouring outlet 12 facing downward, and the liquid content C is poured out from the pouring outlet 12 by pinching the containing part 11 from the front and back with the fingertips to apply pressure to the containing part 11, thereby taking out the liquid content C.

[0051] The resin container 1 exemplified in the present embodiment is a liquid dropping container from which the liquid content C is dropped from the pouring port 12 in an opened state.

[0052] Furthermore, in the container body 10 of the present embodiment, since the housing portion 11 has excellent flexibility, the amount of the liquid content C dripping from the spout 12 can be easily adjusted by, for example, adjusting the applied pressure.

[0053] In order to generate moderate resistance when the liquid content C moves from the storage portion 11 to the outlet 12 so that the dripping amount of the liquid content C can be easily adjusted, the nozzle portion 13 is preferably formed to have an inner diameter (flow path diameter of the liquid content C) within a range of greater than 0.5 mm and less than 6.0 mm.

[0054] The inner diameter is more preferably 0.7 mm or more, further preferably 0.9 mm or more, and particularly preferably 1.0 mm or more.

[0055] The inner diameter may be 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, or 3.0 mm or less, more preferably 2.8 mm or less, further preferably 2.5 mm or less, further more preferably 2.0 mm or less, and particularly preferably 1.8 mm or less.

[0056] Regarding the inner diameter, the cross-sectional area of ​​the figure defined by the inner surface of the nozzle portion 13 when the nozzle portion 13 is cut by a plane perpendicular to the flow direction of the liquid content C can usually be calculated, and the diameter of a circle having the same area as the cross-sectional area can be calculated.

[0057] The nozzle portion 13 preferably includes a portion having the above-described preferred inner diameter with a length of 0.5 mm to 12 mm.

[0058] The length is more preferably 0.7 mm or more, and even more preferably 0.9 mm or more.

[0059] The length is more preferably 10 mm or less, and further preferably 8 mm or less.

[0060] It should be noted that the container body 10 may not have the nozzle portion 13 . Alternatively, the container body 10 may also have the pouring port 12 directly penetrated through the containing portion 11 .

[0061] The container body 10 of this embodiment further includes a holding portion 14 , which extends downward from the lower end of the accommodation portion 11 in a hollow rectangular plate shape.

[0062] More specifically, in the container body 10 of the present embodiment, the housing portion 11 and the nozzle portion 13 are combined into a bottle shape above the holder 14 having a hollow plate-like shape of a vertically long rectangular shape in a front view.

[0063] It should be noted that, in the container body 10 of the present embodiment, the portion that can accommodate the liquid content C is only the bottle-shaped portion, and the hollow portion of the retaining portion 14 is not connected to the internal space of the accommodating portion 11 but becomes an isolated space.

[0064] Here, the internal volume of the container body 10 refers to the volume of the portion that can accommodate the liquid content C, and does not include the volume of the hollow portion of the holding portion 14 .

[0065] As described above, in this embodiment, since the rectangular plate-shaped holding portion 14 is provided, information such as a product name and an expiration date can be displayed on the holding portion 14 .

[0066] It should be noted that, when it is desired to ensure that the accommodating portion 11 has a larger volume, the retaining portion 14 may be reduced or omitted as required.

[0067] The connecting body 100 in this embodiment is formed by connecting adjacent resin containers 1 to each other through a first connecting portion 31 and a second connecting portion 32, so that five resin containers 1 are connected. The first connecting portion 31 connects the side edges of the equal-diameter portion 11a to each other in a manner that the connecting area becomes a linear shape extending up and down, and the second connecting portion 32 connects the side edges of the retaining portion 14 to each other in a manner that the connecting area becomes a linear shape extending up and down.

[0068] The connected body 100 in the present embodiment is a molded product using the blow-fill-seal method as described later.

[0069] Therefore, the resin container 1 in the present embodiment can suppress the mixing of foreign matter when the liquid content C is accommodated in the accommodation portion 11 .

[0070] Furthermore, the resin container 1 in the present embodiment is used as a unit dose container that accommodates a small amount of the liquid content C as described above.

[0071] When taking out the liquid content C from the resin container 1, the following sequence can be used: Figure 2 As shown, first, the first connecting portion 31 and the second connecting portion 32 of the connecting body 100 are broken, and a resin container 1 is taken out from the connecting body 100. Then, the resin container 1 taken out from the connecting body 100 is Figure 5 As shown, the lid 20 is removed to bring the container body 10 into an unsealed state.

[0072] The connection body 100 of the present embodiment can break the connection portions 31 and 32 only by hand force by applying force so as to pull the adjacent resin containers 1 apart without using tools such as scissors and a cutter.

[0073] Furthermore, the container body 10 and the lid 20 in the resin container 1 of the present embodiment may be torn apart by hand without using a tool.

[0074] It is generally known that when a polyethylene resin sheet is torn, linear burrs (protrusions) are easily formed on the fracture surface. If the resin container 1 of this embodiment is formed only by polyethylene resin, burrs may be formed at the parts corresponding to the connecting parts 31', 32' and the peripheral parts of the pouring outlet 12 after the fracture.

[0075] Conventionally, when one resin container is broken from the connected body, sawtooth-like irregularities are easily formed on the connection parts 31 ′ and 32 ′ after the breakage, and burrs are easily formed on the peripheral edge of the pouring port.

[0076] The unevenness of the broken connection parts 31 ′ and 32 ′ may adversely affect the touch when holding the resin container.

[0077] Furthermore, the burrs on the peripheral edge of the pouring spout may prevent the normal dripping of the liquid content that should drip due to gravity.

[0078] However, in the present embodiment, the resin container 1 is made of a specific material, and therefore the occurrence of the above-mentioned problems can be suppressed.

[0079] In this embodiment, Figure 6 , Figure 7 As shown in the figures, the container body 10 has a multi-layer structure, which includes a first layer L1 as the innermost layer connected to the liquid content C, and a second layer L2 connected to the first layer L1 from the outside, the first layer L1 contains cyclic olefin copolymer (COC) and linear low-density polyethylene resin (PE-LLD), and the second layer contains low-density polyethylene resin (PE-LD).

[0080] Although the first layer L1 performs the above-mentioned function by containing cyclic olefin copolymer (COC), it may also show hardness depending on the shape or size of the container body, which may become a resistance when the container 11 is pinched with fingertips to compress and deform in a manner that reduces the internal volume.

[0081] In contrast, in this 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 total thickness of the container body 10 can be set to a value greater than a certain value by the second layer L2.

[0082] Therefore, in the present embodiment, a container thickness capable of suppressing liquid leakage from the container body 10 due to pinholes or the like can be ensured, and the container body can be adjusted to an appropriate hardness that allows easy compression deformation.

[0083] In the present embodiment, the second layer L2 contains PE-LD, thereby making the container body 10 flexible.

[0084] Furthermore, in the present embodiment, since the first layer L1 contains COC and PE-LLD, the affinity between the first layer L1 and the second layer L2 can be improved compared to the case where PE-LLD is not contained.

[0085] Therefore, when the first layer L1 and the second layer L2 are thermally fused and laminated and integrated, excellent adhesion is exhibited between them, and interlayer delamination can be suppressed.

[0086] The PE-LLD contained in the first layer L1 may be a common PE-LLD containing ethylene as a main monomer and an α-olefin having 4 or more carbon atoms (such as 1-butene, 1-hexene, 1-octene, 4-methylpentene-1, etc.) as a comonomer.

[0087] From the viewpoint of more significantly 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.

[0088] The PE-LLD is preferably prepared by introducing short-chain branches into the molecular structure of the comonomer to reduce crystallinity and thereby reduce density.

[0089] The short-chain branches are preferably introduced in a ratio of 5 to 100 per 1000 ethylene structural units, and more preferably introduced in a ratio of 10 to 50 per 1000 ethylene structural units.

[0090] That is, in the PE-LLD, the ratio of the comonomer to the total amount of the comonomer and ethylene is preferably in the range of 0.5 mol% to 10 mol%, and more preferably in the range of 1 mol% to 5 mol%.

[0091] Moreover, the PE-LLD preferably has a density of 910 kg / m 3 More preferably, the density is 915 kg / m 3 above.

[0092] The density of the PE-LLD is preferably 930 kg / m 3 the following.

[0093] The melt flow rate (MFR) of the PE-LLD is preferably 0.5 g / 10 min or more, more preferably 0.6 g / 10 min or more.

[0094] The melt mass flow rate is preferably 5.0 g / 10 min or less, more preferably 4.0 g / 10 min or less, and further preferably 3.0 g / 10 min or less.

[0095] The melt mass flow rate of the PE-LLD and the PE-LD can be calculated based on the A method (mass measurement method) described in JIS K7210:2014 "Plastics - Melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics - Part 1: Standard test methods", and can be calculated under the conditions of a temperature of 190°C and a nominal load of 2.16 kg.

[0096] Similarly, the melt mass flow rate of COC can be determined under the conditions of a temperature of 260° C. and a nominal load of 2.16 kg.

[0097] The PE-LLD may be a polymer produced using a multi-site catalyst such as a Ziegler-Natta catalyst, or a polymer produced using a single-site catalyst such as a metallocene catalyst.

[0098] The first layer L1 of this embodiment may contain not only one type of PE-LLD but also two or more types of PE-LLD.

[0099] The PE-LLD and the COC contained in the first layer L1 are obtained by addition copolymerizing one or more norbornene monomers with ethylene by a known method, or by hydrogenating the monomers according to a conventional method. Specifically, they have a structure represented by the following general formula (1).

[0100] [Chemical formula 1]

[0101]

[0102] Here, R in formula (1) 1 and R 2 are the same or different and represent hydrogen, a hydrocarbon residue, or any polar group selected from halogen, ester, nitrile, and pyridyl. 1 and R 2 They may be bonded to each other to form a ring. x and z are integers of 1 or more, and y is an integer of 0 or 1 or more.

[0103] The glass transition temperature (Tg) of the COC is preferably 60°C or higher, more preferably 63°C or higher, preferably 65°C or higher, and further preferably 67°C or higher. The glass transition temperature (Tg) is preferably 130°C or lower, more preferably 120°C or lower, preferably 110°C or lower, further preferably 100°C or lower, and particularly preferably 90°C or lower.

[0104] In addition, the "glass transition temperature (Tg)" in this specification means the midpoint glass transition temperature determined by measuring under the condition of a heating rate of 10°C / min in accordance with JIS K7121 unless otherwise specified.

[0105] In the case where two or more COCs are used, the Tg of the COC is determined as a weighted average of the respective cyclic olefin resins.

[0106] Taking the moldability of the resin container 1 into consideration, the proportion of the structural unit derived from the norbornene-based monomer in COC is preferably 70% by mass or less.

[0107] The ratio is more preferably 68% by mass or less, further preferably 66% by mass or less, and particularly preferably 64% by mass or less.

[0108] The ratio is preferably 15% by mass or more, more preferably 18% by mass or more, further preferably 20% by mass or more, and particularly preferably 22% by mass or more.

[0109] Specific examples of the polymer having the structural unit represented by the general formula (1) include "APEL (registered trademark)" manufactured by Mitsui Chemicals, Inc. and "Topas (registered trademark)" manufactured by Advanced Polymers GmbH.

[0110] From the viewpoint of moldability, mechanical properties of molded products, and the like, the melt flow rate (MFR (260° C., 2.16 kg)) of the COC is preferably 10 g / 10 min or more and 40 g / 10 min or less.

[0111] The first layer L1 is preferably prepared by mixing COC and PE-LLD so as to show a glass transition temperature of 60°C or higher and 130°C or lower when the glass transition temperature is measured. The glass transition temperature (Tg) is preferably 60°C or higher, more preferably 63°C or higher, preferably 65°C or higher, and further preferably 67°C or higher. The glass transition temperature (Tg) is preferably 130°C or lower, more preferably 120°C or lower, preferably 110°C or lower, further preferably 100°C or lower, and particularly preferably 90°C or lower.

[0112] The first layer of the present embodiment contains more COC than PE-LLD.

[0113] 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 even more preferably 60% by mass or more.

[0114] The ratio is preferably 95% by mass or less, more preferably 90% by mass or less, and further preferably 85% by mass or less.

[0115] In other words, the ratio of PE-LLD in the first layer L1 to the total amount of COC and PE-LLD is preferably 5% by mass or more and less than 50% by mass.

[0116] The resin container 1 of the present embodiment is formed by blow molding, more specifically, by a blow fill seal method.

[0117] Therefore, the resin container 1 can be manufactured, for example, by blowing air into a high-temperature parison whose outer side is the second layer L2 and bringing the parison, which is pressurized from the inside outward, into contact with a molding die.

[0118] It should be noted that, in addition to COC and PE-LLD, the first layer L1 may also contain additive components (rubber / plastic reagents, fillers such as fillers, antioxidants, other resins, etc.), and the content thereof is preferably set to less than 5% by mass, more preferably less than 3% by mass, and further preferably less than 1% by mass.

[0119] It is particularly preferred that the first layer L1 consists essentially of only COC and PE-LLD.

[0120] The second layer L2 which constitutes the container body 10 together with the first layer L1 and is in contact with the first layer L1 from the outside includes PE-LD.

[0121] The density of the PE-LD forming the second layer L2 is preferably 910 kg / m 3 Above and 930kg / m 3Below, more preferably 915kg / m 3 Above and 925kg / m 3 the following.

[0122] PE-LD preferably has a bulky molecular structure as described above, and has many entanglements of molecular chains.

[0123] Specifically, it is preferable that the PE-LD forming the second layer L2 has a polymer obtained by a high pressure polymerization method in which long chain branches exist in the molecular structure.

[0124] The MFR (190° C., 2.16 kg) of PE-LD is preferably 1.5 g / 10 min or less, more preferably 1.3 g / 10 min or less, more preferably 1.1 g / 10 min or less, particularly preferably 1.0 g / 10 min or less.

[0125] The MFR of PE-LD is preferably 0.1 g / 10 min or more, more preferably 0.2 g / 10 min or more, and further preferably 0.3 g / 10 min or more.

[0126] It should be noted that, in addition to PE-LD, the second layer L2 may also contain a small amount of additive ingredients (rubber / plastic reagents, fillers such as fillers, antioxidants, colorants, other resins, etc.), and the content thereof is preferably set to less than 5% by mass, more preferably less than 3% by mass, and further preferably less than 1% by mass.

[0127] It is particularly preferred that the second layer L2 consists essentially of only PE-LD.

[0128] The thickness of each of the first layer L1 and the second layer L2 varies depending on the purpose of the resin container 1, but if it is a small container with a capacity of the liquid content C in the storage portion 11 of less than 10 mL as shown in the example in this embodiment, it is preferably set so that the total thickness of the two is greater than 0.15 mm and less than 1 mm.

[0129] It should be noted that, in order to help the liquid content C to be taken out from the pouring port 12 by increasing the internal pressure in the container, the housing portion 11 is preferably thin and easily deformed, and on the other hand, preferably has a thickness greater than a certain value so as not to be damaged.

[0130] The total thickness (t1+t2) of the thickness (t1) of the first layer L1 and the thickness (t2) of the second layer L2 is preferably greater than 0.2 mm, more preferably greater than 0.24 mm, and further preferably greater than 0.28 mm, at least in the portion of the storage space for the liquid content C formed by the storage portion 11.

[0131] The total thickness (t1+t2) is preferably 0.8 mm or less, more preferably 0.7 mm or less, and further preferably 0.6 mm or less.

[0132] The thickness (t1) of the first layer L1 is preferably 0.05 mm to 0.4 mm, more preferably 0.1 mm to 0.35 mm, and even more preferably 0.15 mm to 0.30 mm.

[0133] The thickness (t2) of the second layer L2 is preferably 0.1 mm to 0.6 mm, more preferably 0.1 mm to 0.55 mm, and even more preferably 0.15 mm to 0.5 mm.

[0134] The liquid content C contained in the containing portion 11 is not particularly limited, and examples thereof include: food and drink (beverages, seasonings, etc.), cosmetics (skin care agents, hair care agents, makeup cosmetics, etc.), medicines (eye drops, nasal drops, oral medicines, disinfectants, etc., contact lens preparations, nutrients, mouthwashes, repellents, etc.), functional medicines (lotions, softeners, fragrances, adhesives, etc.), etc.

[0135] Among them, eye drops are preferred as the liquid content C contained in the resin container 1 of the present embodiment because an appropriate amount of dripping is required.

[0136] That is, the resin container 1 of the present embodiment is preferably an eye drop container.

[0137] The resin container 1 of the present embodiment can be manufactured by the “blow fill seal method” for containing the liquid content C as described above.

[0138] If a specific example is given, the resin container (connected body) of the present embodiment can be produced as follows.

[0139] (1) Blow molding process

[0140] A two-layer structure parison is prepared by extruding in the following manner, i.e., using a molten mixture obtained by melt-kneading raw materials forming the first layer (cyclic olefin copolymer (COC), linear low-density polyethylene resin (PE-LLD)) as the inner side, and using a molten mixture obtained by melt-kneading raw materials forming the second layer (low-density polyethylene (PE-LD)) as the outer side; then, when the mold is closed, the parison is clamped by a mating mold constructed in a manner to form a mold cavity corresponding to the connected body, and either or both of air is pressed into the interior of the parison or the parison is sucked from a vacuum hole provided on the molding surface of the mating mold, and the shapes of various parts such as a receiving part and a retaining part are set on the parison.

[0141] However, at this point in time, the lid body is not formed, and a connected body is produced in which the pouring ports of the respective resin containers are in an open state.

[0142] (2) Filling process

[0143] For example, a nozzle is inserted into the storage portion of each resin container through the outlet, and a specific amount of liquid content is made to flow out from the nozzle, so that the liquid content is stored in the storage portion.

[0144] (3) Sealing process

[0145] After the container contains a specific amount of liquid content, the cover is formed to block the outlet.

[0146] It should be noted that the connected body of the present embodiment may also be produced by a method other than the above-mentioned method.

[0147] In addition, in the present embodiment, an example is given in which the resin container is manufactured in the state of a connected body, but the resin container does not need to be manufactured so as to constitute a connected body.

[0148] Furthermore, in the present embodiment, although containers having specific shapes are exemplified as the connected body or each of the resin containers, the resin container of the present invention is not limited to such examples.

[0149] For example, in this embodiment, an example is given of a case where the resin container has a two-layer structure, but the resin container of the present invention may also have a stacked structure of more than three layers, that is, other functional layers (gas transmission prevention layer, water vapor transmission layer, light transmission prevention layer, content transmission prevention layer) are provided on the outside of the second layer.

[0150] Thus, the present invention is not limited by the above examples at all.

[0151] The resin container of the present embodiment is configured as described above and therefore has the following advantages.

[0152] That is, the resin container of this embodiment comprises: a container body, which has a storage portion for accommodating liquid contents and an outlet for pouring the liquid contents; and a cover body, which blocks the outlet and seals the container body, the container body and the cover body are made of resin, and the container body has a multilayer structure, the multilayer structure comprises a first layer as the innermost layer in contact with the liquid contents and a second layer in contact with the first layer from the outside, the first layer comprises a cyclic olefin copolymer and a linear low-density polyethylene resin, and comprises more of the cyclic olefin copolymer than the linear low-density polyethylene resin, and the second layer comprises a low-density polyethylene resin.

[0153] According to the resin container of this embodiment, it is easy to take out the liquid content.

[0154] It should be noted that the resin container of the present invention is not limited to the above-mentioned embodiment. In addition, the resin container of the present invention is not limited to the above-mentioned effects. The resin container of the present invention can be variously modified within the scope of the present invention.

[0155] Example

[0156] The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these.

[0157] Make as Figure 1 The resin container that became the connected body shown was evaluated for the smoothness of the fracture surface, interlayer delamination, ease of extrusion, moldability, and component preservation.

[0158] In addition, the raw materials used for these evaluations are as follows.

[0159] <Test Materials>

[0160] COC1:

[0161] Cyclic olefin copolymer (glass transition temperature 78°C, density 1010kg / m 3 , melt flow rate 32 g / 10 min (260°C), trade name "TOPAS8007S" (manufactured by Polyplastic Co., Ltd.)

[0162] COC2:

[0163] Cyclic olefin copolymer (glass transition temperature 80°C, density 1020kg / m 3 , melt flow rate 30 g / 10 min (260° C.), trade name “APEL APL6509T” (manufactured by Mitsui Chemicals, Inc.)).

[0164] PE-LLD:

[0165] Linear low-density polyethylene (density 920kg / m 3 , melt flow rate: 0.95 g / 10 min (190°C).

[0166] PE-LD:

[0167] Low density polyethylene (density 922kg / m 3 , melt flow rate: 0.60 g / 10 min (190°C).

[0168] <Evaluation>

[0169] (Evaluation 1: Smoothness of fracture surface)

[0170] A two-layer resin container was prepared, the two-layer structure comprising a first layer (inner layer) containing a cyclic olefin copolymer and a linear low-density polyethylene or a low-density polyethylene in the mixing ratio (%) shown in Table 1, and a second layer (outer layer) containing a low-density polyethylene.

[0171] The resin container was produced by the blow-fill-seal method so as to form a connected body of five resin containers, and the interior of a container with a capacity of 1 mL was filled with 0.5 mL of purified water.

[0172] The produced connected body was separated into individual resin containers with fingers.

[0173] A fingertip was passed over one fractured surface (connected portions 31 ′, 32 ′ after breaking) twice, and the smoothness of the fractured surface was determined based on the following criteria.

[0174] The results are shown in Table 1.

[0175] ○: No painful scratching was felt at the fingertips at any of the fractured connection portions.

[0176] ×: Painful scratching was felt at the fingertips at one or more fractured connection points.

[0177] [Table 1]

[0178]

[0179] (Evaluation 2: interlayer peeling)

[0180] A connected body sealed with purified water was prepared in the same manner as in Evaluation 1, and the connected portion was cut with fingers to separate the connected body into individual resin containers.

[0181] The lid of the resin container was twisted off to create an opening, and purified water was discharged.

[0182] With the spout facing upward, cut the container in the horizontal direction using a cutter.

[0183] Grip the outer side of the cut receiving portion with your fingers and squeeze it five times.

[0184] Then, the container was rotated 90 degrees, and the outer side surface of the container portion was pinched and squeezed five times with fingers in a direction perpendicular to the previous five times.

[0185] Thereafter, the peeling state of the first layer and the second layer was visually observed.

[0186] Ten containers were tested and judged according to the following criteria.

[0187] The results are shown in Table 1.

[0188] ○: No delamination was observed in any of the ten samples.

[0189] ×: Interlayer delamination was observed in one or more.

[0190] (Evaluation 3: Ease of squeezing)

[0191] The cap of the resin container in which purified water was sealed was twisted off in the same manner as in Evaluation 2 to open the pouring port.

[0192] With the outlet pointed vertically downward, pinch the sides of the container with your fingers and squeeze to discharge the purified water.

[0193] Drain until there is no purified water.

[0194] The evaluation was performed twice by three testers.

[0195] The first time, the evaluation was performed by discharging purified water in the form of drops.

[0196] The second time, the storage part is squeezed with a stronger force than the first time, so that the purified water is discharged in a continuous line or drips at a faster speed than the first time, and the evaluation is carried out.

[0197] The extrusion ease was evaluated according to the evaluation criteria.

[0198] The results are shown in Table 1.

[0199] ○: Purified water can be easily discharged both the first and second times.

[0200] △: Purified water can be easily discharged in either the first or second time.

[0201] ×: Purified water could not be easily discharged or the entire amount could not be discharged in both the first and second times.

[0202] (Evaluation 4: Formability)

[0203] A connected body sealed with purified water was prepared in the same manner as in Evaluation 1, and the connected body was broken into individual resin containers with fingers. The lid of the resin container was twisted off to create an opening, and the purified water was discharged.

[0204] Observe the appearance and evaluate the presence or absence of fish eyes.

[0205] Fisheye refers to the presence of tiny particles in the resin that have a different refractive index from the surrounding area, which is optically non-uniform.

[0206] Next, the pouring port of the resin container is directed upward, and the housing portion is cut in the horizontal direction using a cutter.

[0207] The container housing portion was observed from the cut surface to evaluate the presence or absence of uneven wall thickness.

[0208] Ten containers were tested and judged based on the following criteria.

[0209] The results are shown in Table 1.

[0210] ○: All 10 samples had no fish eyes and no uneven wall thickness.

[0211] ×: Fish eyes and / or uneven wall thickness exist in one or more.

[0212] (Evaluation 5: Component preservation)

[0213] A resin container was prepared in the same manner as in Evaluation 1 except that 0.5 mL of a 0.03% l-menthol aqueous solution was contained instead of purified water.

[0214] Each resin container was broken one by one with fingers.

[0215] After being stored at 60°C for two weeks, the mixture was cooled to room temperature.

[0216] Take out 100 μL of the contained drug solution and smell the aroma of l-menthol.

[0217] As a comparison object, a 1 mL glass ampoule was filled with 0.5 mL of a 0.03% l-menthol aqueous solution and sealed. After storage at 60°C for two weeks, the aroma of l-menthol in 100 mL of the drug solution was smelled.

[0218] Evaluate according to the evaluation criteria.

[0219] The results are shown in Table 1.

[0220] ○: The aroma of l-menthol remains to the same extent as that of the comparative object.

[0221] △: The aroma of l-menthol is weaker than that of the comparative object, but a sufficiently good aroma is felt.

[0222] ×: The aroma of l-menthol is hardly felt.

[0223] From the above, it can be seen that the resin container of the present invention is a resin container with good moldability and no interlayer delamination. Furthermore, it can be seen that it is a container with good disconnection of the connection body, easy removal of liquid contents, and excellent storage of liquid contents.

[0224] Description of Reference Numerals

[0225] 1: resin container; 10: container body; 11: storage part; 12: pouring port; 13: nozzle part; 14: holding part; 20: cover body; 31, 32: connecting part; 100: connecting body; L1: first layer; L2: second layer.

Claims

1. A resin container comprising: a container body having a receiving portion for receiving liquid contents and an outlet for pouring the liquid contents; and a cover body that blocks the pouring port and seals the container body, The container body and the cover are made of resin, and The container body has a multi-layer structure, wherein the multi-layer structure includes a first layer as an innermost layer in contact with the liquid content, and a second layer in contact with the first layer from the outside. The first layer comprises a cyclic olefin copolymer and a linear low-density polyethylene resin, and comprises more of the cyclic olefin copolymer than the linear low-density polyethylene resin, The second layer comprises a low-density polyethylene resin, The linear low-density polyethylene resin is a resin having ethylene as a main monomer and an α-olefin having 4 or more carbon atoms as a comonomer, and short-chain branches are introduced into the molecular structure through the comonomer. The short chain branches are introduced into the molecular structure at a ratio of 5 or more and 100 or less per 1000 units of ethylene structural units.

2. The resin container according to claim 1, in, The cover body and the container body are integrally formed. The cover body and the container body can be broken.

3. The resin container according to claim 1 or 2, in, The capacity of the container body is greater than or equal to 0.1 mL and less than or equal to 10 mL. 4 . The resin container according to claim 1 , which is a liquid dropping container for dropping the liquid content from the pouring port.

5. The resin container according to any one of claims 1 to 4, in, The glass transition temperature of the first layer is 60° C. or higher and 130° C. or lower.

6. The resin container according to any one of claims 1 to 5, in, The ratio of the linear low-density polyethylene resin in the first layer to the total amount of the cyclic olefin copolymer and the linear low-density polyethylene resin is 5% by mass or more and less than 50% by mass.

7. The resin container according to any one of claims 1 to 6, in, The linear low density polyethylene resin contains 1-hexene as a comonomer.

8. The resin container according to any one of claims 1 to 7, in, The density of the low-density polyethylene resin contained in the second layer is 910 kg / m 3 Above and 930kg / m 3 the following.

9. The resin container according to any one of claims 1 to 8, in, The melt mass flow rate of the low-density polyethylene resin contained in the second layer is 0.1 g / 10 min or more and 1.5 g / 10 min or less.

10. A resin container connection body comprising a connection body formed by connecting a plurality of the container bodies of the resin containers according to any one of claims 1 to 9, In the connection body, the plurality of container bodies arranged with the opening direction of the pouring port facing upward are arranged side by side, and the adjacent resin containers are connected to each other by connecting portions provided at the side edges. The connected body is an integrally molded product, and can be separated into the individual resin containers by breaking the connecting portion.

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