Resin container and resin container connection body

Abstract

The present invention is a resin container including a cyclic olefin copolymer on the inner wall surface of a container body, wherein the diameter of the upstream side of a pouring port of the container body is set to 0.5 mm or more and 8.0 mm or less.

Description

Technical Field

[0001] The present invention relates to a resin container and more particularly to a resin container including a resin container body for accommodating liquid contents and a resin container connection body including 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 a resin container, the following resin container is known, which comprises: a main body portion that accommodates liquid contents; and a neck portion that is connected to the main body portion and has a small diameter, and a pouring outlet at the front end of the neck portion for taking out the liquid contents to the outside (see the following patent document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2000-238847 Summary of the invention

[0007] Technical Problems to be Solved by the Invention

[0008] In a resin container constructed so that liquid contents can be taken out to the outside through a neck having a smaller diameter than a main body, the liquid contents may enter the neck during storage, and even if the spout is turned upward, the liquid contents may not fall from the neck and may accumulate.

[0009] If the resin container in such a state is opened, the accumulated liquid content may splash out to the outside at the same time as it is opened.

[0010] Therefore, the present invention aims to solve such a problem, and aims to provide a resin container in which liquid accumulation is unlikely to occur, and a resin container connection body including a connection body formed by connecting a plurality of such resin containers.

[0011] Technical means to solve technical problems

[0012] The present invention for solving the above-mentioned technical problems provides a resin container, which has a resin container body, the container body accommodating liquid contents and having a pouring outlet, the container body having a main body portion accommodating the liquid contents, the pouring outlet of the container body having a smaller diameter than the main body portion, the inner wall surface of the container body connected to the liquid contents comprising a cyclic olefin copolymer, and the diameter of at least a portion of the flow path of the liquid contents on the upstream side of the pouring outlet is greater than 0.5 mm and less than 8.0 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] 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.

[0014] 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.

[0015] Figure 3 It is a front view showing the resin container in a state separated from the connected body.

[0016] Figure 4 It is a side view showing the resin container in a state separated from the connected body.

[0017] Figure 5 This is a front view showing a state where the resin container is opened.

[0018] Figure 6 This is a front view showing a state where a resin container according to another embodiment is opened.

[0019] Figure 7 Yes means Figure 5 A cross-sectional view taken along line VII-VII.

[0020] Figure 8 Yes Figure 7 An enlarged sectional view showing the section (cross section of the main body) viewed along the line IIX-IIX.

[0021] Fig. 9 Yes Figure 7 An enlarged cross-sectional view showing the cross-section (neck cross-section) viewed along line IX-IX. DETAILED DESCRIPTION

[0022] Hereinafter, embodiments of the resin container according to the present invention will be described with reference to the drawings.

[0023] 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.

[0024] Figure 1 This is a diagram showing a connected body 100 in which five resin containers 1 are connected.

[0025] As also shown in the figure, 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 a pouring port 12 for the liquid content C.

[0026] 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 .

[0027] The resin container 1 in the present embodiment is configured such that the cover 20 is integrally formed with the container body 10 , and the pouring port 12 appears by breaking the cover 20 from the container body 10 .

[0028] 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 .

[0029] 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 .

[0030] In the connection body 100 of this embodiment, the plurality of container bodies 10 arranged with the opening direction of the pouring outlet 12 facing upward are arranged in a row and are arranged side by side in the horizontal direction, and a connection portion is provided between two adjacent resin containers 1 in the direction of the side by side arrangement.

[0031] 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.

[0032] 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.

[0033] That is, the connection state in the connection portion is not particularly limited.

[0034] In the connection body 100 illustrated in the present embodiment, the container bodies 10 are connected to each other by the connection parts 31 and 32 extending up and down along the side edge parts of the container bodies 10 .

[0035] 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 .

[0036] As for the container body 10 of this embodiment, the internal volume of the container body 10 in the state sealed by the cover body 20 is not particularly limited, for example, the internal volume can be set to less than 10 mL at normal temperature (eg 23° C.) and normal pressure (eg 1.0 atm).

[0037] The internal volume in this embodiment may be 8 mL or less, 6 mL or less, or 4 mL or less.

[0038] The internal volume may be set to be greater than 0.1 mL, and may be set to be greater than 0.2 mL.

[0039] The internal volume may be 0.3 mL or more, or 0.4 mL or more.

[0040] The volume of the container body 10 is more preferably 0.1 mL or more and 10 mL or less.

[0041] When a part of the liquid content C formed by the accumulated liquid leaks out when opening, even if the absolute amount lost is small, the proportion of the total loss is large when the resin container has a small capacity.

[0042] Therefore, in order to more significantly exhibit the effects of the present invention, it is preferable that the resin container 1 has the above-mentioned volume.

[0043] The housing portion 11 of the container body 10 in this embodiment is in the shape of a bottomed cylinder.

[0044] Specifically, the container body 10 in this embodiment comprises: a cylindrical main body 10a; a shoulder 10b, which is connected to the upper end of the main body 10a; and a neck 10c, which is connected to the upper end of the shoulder 10b; the container body 10 is constructed such that the outlet 12 opens upward on the upper end surface of the neck 10c.

[0045] The main body 10a is in a cylindrical shape having a substantially constant cross-sectional shape (inner diameter) when cut along a horizontal plane.

[0046] The shoulder portion 10b is formed so that the cross-sectional shape (inner diameter) when cut along a horizontal plane gradually decreases in diameter upward.

[0047] The container body 10 of the present embodiment includes a neck portion 10 c extending upward from the upper end of the shoulder portion 10 b in a cylindrical shape having a smaller diameter than the main body portion 10 a .

[0048] 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.

[0049] 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.

[0050] The container body 10 of the present embodiment has the neck 10 c, so that the entire amount of the liquid content C that drips from the pouring port 12 due to its own weight when facing downward is suppressed.

[0051] 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.

[0052] The neck portion 10 c in this embodiment forms a flow path of the liquid content C on the upstream side of the pouring port 12 when the liquid content C contained in the main body portion 10 a is poured out to the outside through the pouring port 12 .

[0053] In order to prevent the liquid content C from accidentally entering the neck 10c and forming a liquid accumulation, the neck 10c is preferably formed to have an inner diameter (a flow path diameter of the liquid content C) within a range of 0.5 mm to 8.0 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 also be less than 7.5 mm, less than 7.0 mm, less than 6.5 mm, less than 6.0 mm, less than 5.5 mm, less than 5.0 mm, less than 4.5 mm, less than 4.0 mm, less than 3.5 mm, less than 3.0 mm, more preferably less than 2.8 mm, further preferably less than 2.5 mm, further preferably less than 2.0 mm, and particularly preferably less than 1.8 mm.

[0056] The resin container 1 shown as an example in this embodiment has the neck 10c as described above, and at least a portion of the flow path of the liquid content C preferably on the upstream side of the pouring port 12 has the above-mentioned diameter. Figure 6 The same is true for the neckless resin container 1x shown.

[0057] Figure 6 The resin container 1x shown is also similar to the Figure 1 to Figure 5 The resin container 1 shown is the same in that it includes a container body 10x having a pouring port 12x, a cover 20x for closing the pouring port 12x and sealing the container body, and the container body 10x has a retaining portion 14x described later.

[0058] on the other hand, Figure 6 The resin container 1x shown is different from the Figure 1 to Figure 5 The resin container 1 shown is different in that a pouring port 12x is opened at the upper end of a shoulder portion 10bx connected to the upper side of a main body portion 10ax.

[0059] However, regarding the following aspects Figure 1 to Figure 5 The resin container 1 shown is similar in that the upstream side of the liquid content C in the flow direction when the liquid content C is extracted from the pouring port 12 has a specific diameter, so that the formation of liquid accumulation can be suppressed.

[0060] Specifically, the following aspects and Figure 1 to Figure 5 The same as the resin container 1 shown, that is, by setting the inner diameter at the upper end of the shoulder 10bx which becomes the flow path of the liquid content C on the upstream side of the pouring outlet 12 to the upper end until reaching the pouring outlet 12 to be within the above-mentioned range (for example, 0.5 mm to 8.0 mm), the formation of liquid accumulation can be suppressed.

[0061] The internal cross-sectional area (S0) of the main body 10a and the cross-sectional area (S1) of the flow path at a portion having the above-mentioned diameter, which are related to the formation of the fluid accumulation, are preferably specific areas.

[0062] The internal cross-sectional area (S0) of the main body 10a (the area of ​​the inner side of the inner wall surface when cut in a horizontal plane) is preferably 20 mm 2 More than 25 mm is more preferred 2 Above, particularly preferably 30 mm 2 above.

[0063] The inner cross-sectional area (S0) may be 300 mm 2 Below, 260mm 2 Below, 220mm 2 Below, 180mm 2 Below, preferably 140mm 2 Below, more preferably 120mm 2 Below, particularly preferably 100 mm 2 the following.

[0064] The ratio (S0 / S1) of the internal cross-sectional area (S0) of the main body 10a to the cross-sectional area (S1) of the flow path is preferably 1.5 or more, more preferably 2 or more, further preferably 5 or more, and particularly preferably 10 or more.

[0065] The (S0 / S1) is preferably 60 or less, more preferably 50 or less, further preferably 40 or less, and particularly preferably 30 or less.

[0066] The main body 10a of this embodiment does not need to be cylindrical as exemplified above.

[0067] In this case, the main body preferably has an internal cross-sectional area (S0) as described above at the portion with the largest diameter that is compressed by fingertips etc. when pouring out the liquid contents, and is preferably formed so that the central portion in the height direction has the internal cross-sectional area (S0) as described above.

[0068] Regarding the inner diameter (flow path diameter) of the neck 10c, the cross-sectional area of ​​the figure defined by the inner surface of the neck 10c when the neck 10c 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.

[0069] Regarding the inner diameter, for Figure 6 The resin container 1x shown can also be obtained in the same manner, and the flow path diameter 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.

[0070] The neck portion 10c preferably includes a portion having the above-mentioned preferred inner diameter with a length of 0.5 mm to 12 mm.

[0071] The length is more preferably 0.7 mm or more, and even more preferably 0.9 mm or more.

[0072] The length is more preferably 10 mm or less, and further preferably 8 mm or less.

[0073] 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.

[0074] More specifically, in the container body 10 of the present embodiment, a storage space in the shape of the bottle as described above is provided above the holder 14 in the shape of a hollow plate having a vertically long rectangular shape in a front view.

[0075] 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.

[0076] 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 .

[0077] 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 .

[0078] 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.

[0079] The connecting body 100 in this embodiment is formed by connecting five resin containers 1 to each other by connecting adjacent resin containers 1 to each other through a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 connects the side edges of the main body 10a to each other in a manner such 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 such that the connecting area becomes a linear shape extending up and down.

[0080] The connected body 100 in the present embodiment is a molded product formed by a blow fill seal method as described later.

[0081] 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 .

[0082] Furthermore, the resin container 1 in the present embodiment is used as a unit dose container for a small amount of the liquid content C as described above.

[0083] 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.

[0084] The connection body 100 of the present embodiment can break the connection parts 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.

[0085] Furthermore, the container body 10 and the lid 20 in the resin container 1 of the present embodiment can be torn apart by hand without using a tool.

[0086] 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.

[0087] The irregularities of the broken connection portions 31 ′ and 32 ′ may adversely affect the touch when the resin container is held.

[0088] Furthermore, the burrs on the peripheral edge of the pouring port may prevent the normal dripping of the liquid content that should drip due to gravity.

[0089] However, in the present embodiment, since the resin container 1 is made of a specific material, the occurrence of the above-mentioned problems can be suppressed.

[0090] In this embodiment, Figure 7 , Figure 8 , Fig. 9 As shown in the figures, the container body 10 has a multilayer 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 a cyclic olefin copolymer (COC) and a linear low-density polyethylene resin (PE-LLD), and the second layer contains a low-density polyethylene resin (PE-LD).

[0091] In the container body 10 containing the liquid content C, by including the cyclic olefin copolymer (COC) in the first layer L1 constituting the inner wall surface, appropriate wetting of the liquid content C can be achieved.

[0092] Furthermore, by virtue of the above-described configuration and by providing the neck portion 10 c with an appropriate inner diameter, the formation of fluid accumulation in the neck portion 10 c is suppressed in the present embodiment.

[0093] 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.

[0094] Therefore, in the present embodiment, it is possible to ensure a container thickness that is sufficient to suppress the occurrence of liquid leakage from the container body 10 due to pinholes or the like.

[0095] In the present embodiment, the second layer L2 contains PE-LD, thereby making the container body 10 flexible.

[0096] 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.

[0097] 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.

[0098] 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, there is a possibility that burrs will be formed at the position corresponding to the connecting parts 31', 32' or the peripheral part of the pouring port 12 after the tearing.

[0099] However, in this embodiment, by providing the container body 10 with a two-layer structure using the above-mentioned resin, the height of the saw-blade-like projections and depressions of the connection parts 31', 32' after the break or the burrs formed on the peripheral edge of the spout 12 can be suppressed to a low level.

[0100] 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.

[0101] From the viewpoint of more significantly exhibiting 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.

[0102] 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.

[0103] The short chain branches are preferably introduced at a ratio of 5 to 100 per 1000 units of the structural units derived from ethylene, and more preferably at a ratio of 10 to 50 per 1000 units of the structural units derived from ethylene.

[0104] 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%.

[0105] Moreover, the PE-LLD preferably has a density of 910 kg / m 3 More preferably, the density is 915 kg / m 3 above.

[0106] The density of the PE-LLD is preferably 930 kg / m 3 the following.

[0107] 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.

[0108] 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.

[0109] 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-Method for determining the 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.

[0110] Similarly, the melt mass flow rate of COC can be found under the conditions of a temperature of 260°C and a nominal load of 2.16 kg.

[0111] 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.

[0112] 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.

[0113] 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 them according to a conventional method. Specifically, they have a structure represented by the following general formula (1).

[0114] [Chemical formula 1]

[0115]

[0116] 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.

[0117] 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.

[0118] In addition, the "glass transition temperature (Tg)" in this specification means the midpoint glass transition temperature specified by measuring under the condition of a heating rate of 10°C / min in accordance with JIS K7121 unless otherwise specified.

[0119] When two or more COCs are used, the Tg of COC is specified as a weighted average of the respective cyclic olefin resins.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] From the viewpoints 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.

[0125] The first layer L1 is preferably blended with COC and PE-LLD so that the glass transition temperature is 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.

[0126] 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.

[0127] 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.

[0128] The first layer of this embodiment contains more COC than PE-LLD.

[0129] 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.

[0130] The ratio is preferably 95% by mass or less, more preferably 90% by mass or less, and further preferably 85% by mass or less.

[0131] 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.

[0132] The resin container 1 of the present embodiment is formed by blow molding, more specifically, by a blow fill seal method.

[0133] 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.

[0134] It should be noted that, in addition to COC or 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.

[0135] It is particularly preferred that the first layer L1 consists essentially of only COC and PE-LLD.

[0136] 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.

[0137] The density of the PE-LD forming the second layer L2 is preferably 910 kg / m 3 Above and 930kg / m 3 Below, preferably 915kg / m 3 Above and 925kg / m 3 the following.

[0138] PE-LD preferably has a large molecular structure as described above, and has many entanglements of molecular chains.

[0139] 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.

[0140] The MFR (190° C., 2.16 kg) of PE-LD is preferably 1.5 g / 10 min or less, 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.

[0141] 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.

[0142] 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 and other filling materials, 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.

[0143] It is particularly preferred that the second layer L2 consists essentially of only PE-LD.

[0144] 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 exemplified 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.

[0145] It should be noted that, in order to help the liquid content C 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.

[0146] 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 constituting the storage space for the liquid content C in the storage portion 11.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] The liquid content C contained in the container 11 is not particularly limited as long as it has fluidity, and examples thereof include: food and drink (beverages, seasonings, oral medications, nutritional supplements, etc.), external preparations (skin care agents, hair care agents, cosmetics such as eye drops, ophthalmic compositions such as contact lens preparations, nasal drops, disinfectants, mouthwashes, repellents, etc.), functional medicines (lotions, softeners, fragrances, deodorants, adhesives, etc.), etc.

[0151] Among the above-mentioned liquid contents C, an ophthalmic composition is suitable as the liquid content C contained in the resin container 1 of the present embodiment in that an appropriate amount is required to be dropped.

[0152] 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 wash liquids or eye wash medicines), contact lens preparations, and contact lens care products (including disinfectants, preservatives, and cleansers).

[0153] 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.

[0154] If a specific example is given, the resin container (connected body) of the present embodiment can be produced as follows.

[0155] (1) Blow molding process

[0156] A two-layer structure parison is prepared by extruding in the following manner, i.e., a molten mixture obtained by melt-kneading raw materials (cyclic olefin copolymer (COC), linear low-density polyethylene resin (PE-LLD)) for forming the first layer is placed on the inner side, and a molten mixture obtained by melt-kneading raw materials (low-density polyethylene (PE-LD)) for forming the second layer is placed on 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.

[0157] However, at this point in time, a connected body is produced in which the pouring ports of the respective resin containers are opened without forming the cover.

[0158] (2) Filling process

[0159] 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.

[0160] (3) Sealing process

[0161] After the container contains a specific amount of liquid content, the cover is formed to block the outlet.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] Thus, the present invention is not limited by the above examples at all.

[0167] The resin container of the present embodiment is configured as described above and therefore has the following advantages.

[0168] That is, the resin container of this embodiment includes a resin container body, which contains liquid contents and has a pouring outlet, the container body has a main body portion for containing the liquid contents, the pouring outlet of the container body has a smaller diameter than the main body portion, the inner wall surface of the container body connected to the liquid contents includes a cyclic olefin copolymer, and the diameter of at least a portion of the flow path of the liquid contents on the upstream side of the pouring outlet is greater than 0.5 mm and less than 8.0 mm.

[0169] According to the resin container of this embodiment, liquid accumulation is less likely to occur.

[0170] 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.

[0171] Example

[0172] The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these.

[0173] Make it like Figure 1 The resin container of the connected body shown was used to evaluate the accumulation of fluid in the neck.

[0174] In addition, the raw materials used for these evaluations are as follows.

[0175] <Test Materials>

[0176] COC1:

[0177] 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.)

[0178] COC2:

[0179] 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.)

[0180] PE-LLD:

[0181] Linear low-density polyethylene (density 920kg / m 3 , melt flow rate 0.95g / 10min (190℃)

[0182] PE-LD:

[0183] Low density polyethylene (density 922kg / m 3 , melt flow rate 0.60g / 10min (190℃)

[0184] <Evaluation>

[0185] 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 at the mixing ratio (%) shown in Table 1, and a second layer (outer layer) containing a low-density polyethylene. In addition, a two-layer resin container was prepared, the two-layer structure comprising a first layer (inner layer) containing a low-density polyethylene, and a second layer (outer layer) containing a low-density polyethylene.

[0186] The resin container was produced by the blow-fill-seal method so as to form a connected body in which five resin containers were connected.

[0187] The lid of the resin container was twisted off to form an opening.

[0188] Prepare a buffer solution (containing 0.6% by mass of sodium hydrogen phosphate and 0.07% by mass of sodium dihydrogen phosphate), and with the opening of the resin container facing downward, squeeze the containing part to slightly expel the air inside, make the opening contact the liquid surface of the buffer solution, and reduce the force of squeezing the containing part to absorb the buffer solution from the opening.

[0189] The force with which the receiving portion is squeezed is adjusted so that the amount of buffer is enough to fill the neck of the container.

[0190] Next, the container was fixed with the opening facing upward, and the time (time A) until the liquid level at the opening dropped by 10% of the neck length was measured.

[0191] The amount of buffer in the neck at time A was measured.

[0192] The buffer solution was similarly sucked into the resin container of each test example, and the amount of the buffer solution in the neck at the time when time A had passed since the container was fixed with the opening facing upward was measured.

[0193] The improvement degree of the residual liquid in the neck was calculated according to Formula 1.

[0194] [Formula 1]

[0195] Residual improvement (%) = {1-(liquid volume in the neck of the container of the embodiment / liquid volume in the neck of the container without COC)}×100

[0196] The container of each test example was measured five times, and the average of the residual improvement degree was defined as the residual improvement degree of the test example. The results of the evaluation according to the evaluation criteria are shown in the table.

[0197] ◎: The degree of improvement in residual properties is 30% or more.

[0198] ○: The degree of improvement in residual content is 20% or more and less than 30%.

[0199] △: The residual improvement is less than 20%.

[0200] [Table 1]

[0201]

[0202]

[0203] From the above, it can be seen that the resin container of the present invention is less likely to cause liquid accumulation in the neck portion.

[0204] Description of Reference Numerals

[0205] 1: resin container; 10: container body; 11: storage portion; 12: pouring port; 14: holding portion; 20: lid; 31, 32: connecting portions; 100: connection body; L1: first layer; L2: second layer.

Claims

1. A resin container comprising a resin container body, the container body containing liquid contents and having a pouring port, The container body has a main body portion for accommodating the liquid content. The diameter of the outlet of the container body is smaller than that of the main body. The inner wall surface of the container body in contact with the liquid content comprises a cyclic olefin copolymer and a linear low-density polyethylene resin, The diameter of at least a portion of the flow path of the liquid content on the upstream side of the pouring port is 0.5 mm or more and 8.0 mm or less, 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 the structural units derived from ethylene.

2. 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 mass % or more and 98 mass % or less.

3. The resin container according to claim 1 or 2, wherein: The internal cross-sectional area S0 of the main body is 20 mm 2 Above and 300mm 2 the following.

4. The resin container according to claim 3, wherein: A ratio S0 / S1 of the internal cross-sectional area S0 of the main body portion to the cross-sectional area S1 of the flow path is greater than or equal to 1.5 and less than or equal to 60.

5. The resin container according to any one of claims 1 to 4, wherein The volume of the container body is greater than or equal to 0.1 mL and less than or equal to 10 mL.

6. The resin container according to any one of claims 1 to 5, wherein The liquid content is an external preparation.

7. 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 6, 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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