JP2020059550A - Resin container - Google Patents

Abstract

To provide a resin container in which a liquid pool is not easily formed.SOLUTION: There is provided the resin container in which an inner wall surface of a container body contains a cyclic olefin copolymer and a diameter of an upstream side of a spout is 0.5 mm or more and 8.0 mm or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin container, and more particularly, to a resin container including a resin container body that accommodates a liquid container.

Conventionally, various kinds of resin containers have been widely used to store liquid containers.
As this type of resin container, a body for containing a liquid content and a neck portion of a small diameter connected to the body are provided, and a pouring outlet for taking out the liquid content to the outside is provided at the tip of the neck. A resin container is known (see Patent Document 1 below).

JP-A-2000-238847

In a resin container configured to take out a liquid content to the outside through a neck portion having a diameter smaller than that of the body, even if the liquid content enters the neck portion during storage and the spout is directed upward In some cases, the contents do not fall from the neck and form a liquid pool.
When the resin container in such a state is opened, there is a possibility that the stored liquid contents may jump out to the outside at the same time as the opening.
Then, this invention makes it a subject to solve such a problem, and makes it a subject to provide the resin-made container which is hard to produce a liquid pool.

  The inventors of the present invention have made extensive studies to solve the above problems, and the above-mentioned problems are caused by containing a cyclic olefin copolymer on the inner wall surface of the resin container and setting the upstream side of the spout to a predetermined diameter. The present invention has been completed by finding that it hardly occurs.

  MEANS TO SOLVE THE PROBLEM This invention is provided with the resin-made container main body which accommodates a liquid accommodation thing, in order to solve the said subject, The said container main body and the body part which accommodates the said liquid accommodation thing, and a spout whose diameter is smaller than this body part. And has a cyclic olefin copolymer on the inner wall surface of the container body in contact with the liquid container, at least a part of the flow path of the liquid container on the upstream side of the pouring outlet, Provided is a resin container having a diameter of 0.5 mm or more and 8.0 mm or less.

  According to the present invention, it is possible to provide a resin container in which a liquid pool is not easily formed.

The front view which showed the connection body which the resin container provided with the container main body and the lid body connected in multiple numbers. The front view which showed the mode that the resin-made container provided with the container main body and the lid body was isolated from the connection body. The front view which showed the mode of the resin-made container in the state isolated from the connection body. The side view which showed the mode of the resin container in the state isolate | separated from the connection body. The front view which showed a mode that the resin container was opened. The front view which showed the mode that the resin container which concerns on another embodiment was opened. Sectional drawing which showed the VII-VII line arrow cross section of FIG. The expanded sectional view which expanded and showed the IIX-IIX line arrow cross section (body cross section) of FIG. The expanded sectional view which expanded and showed the IX-IX line arrow cross section (neck cross section) of FIG.

Hereinafter, embodiments of the resin container of the present invention will be described with reference to the drawings.
In the following, an embodiment of the present invention will be described by taking a case where a plurality of resin containers are connected to form a connected body.
FIG. 1 is a diagram showing a connected body 100 in which five resin containers 1 are connected.
As also shown in this figure, the resin container 1 of the present embodiment has a container body 10 having a container 11 for containing a liquid container and a spout 12 for the liquid container C. It is equipped.

The resin container 1 according to the present embodiment further includes a resin lid 20 that closes the spout 12 of the container body 10 and seals the container body 10 as shown in FIGS. 1 to 5.
In the resin container 1 according to this embodiment, the lid 20 and the container body 10 are integrally molded, and the spout 12 is exposed by breaking the lid body 20 from the container body 10. It is configured.
That is, the resin-made 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.

In the present embodiment, a plurality of resin containers 1 including the container body 10 and the lid 20 are connected in series to form the connector 100.
In the connected body 100 in the present embodiment, the plurality of container main bodies 10 arranged so that the opening direction of the spout 12 is upward are arranged side by side in a row, and in the side-by-side direction. It has a connecting portion for connecting them between two adjacent resin containers 1.
That is, in the connecting body 100, the plurality of resin containers 1 are connected to each other by the connecting portions provided on the respective side edge portions.
The connecting portion may connect the adjacent container bodies 10 in a dot shape or may connect in a linear shape, or may connect the adjacent lid bodies 20 in a dot shape. It may be connected in a shape.
That is, the connection state of the connection portion is not particularly limited.
In the coupling body 100 illustrated in the present embodiment, the container bodies 10 are connected to each other by the connecting portions 31 and 32 extending vertically along the side edge portions of the container body 10.
In the present embodiment, not only the individual resin container 1 including the container body 10 and the lid 20 is an integrally molded product, but the connecting body 100 is an integrally molded product, and the connecting portion is By breaking 31 and 32, the plurality of resin containers 1 can be individually separated.

The container body 10 of the present embodiment is not particularly limited in the internal volume of the container body 10 in a state of being sealed by the lid body 20, but is, for example, room temperature (for example, 23 ° C.) or normal pressure (for example, At 1.0 atm), the internal volume can be 10 mL or less.
The internal volume in the present embodiment may be 8 mL or less, may be 6 mL or less, and may be 4 mL or less.
The internal volume can be 0.1 mL or more, and can be 0.2 mL or more.
The 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 0.1 mL or more and 10 mL or less.
When a part of the liquid contents C due to the liquid pool leaks at the time of opening, even if the absolute amount lost due to the leak is small, the loss ratio in the whole is large when such a resin container has a small capacity. Will be things.
Therefore, in order to exert the effects of the present invention more remarkably, the resin container 1 preferably has the above-mentioned volume.
In the container body 10 according to the present embodiment, the housing portion 11 has a bottomed tubular shape.
Specifically, the container body 10 in the present embodiment includes a tubular body portion 10a, a shoulder portion 10b connected to the upper end of the body portion 10a, and a neck portion 10c connected to the upper end of the shoulder portion 10b. The spout 12 is configured to open upward on the upper end surface of the neck portion 10c.
The body 10a has a tubular shape with a substantially constant cross-sectional shape (inner diameter) when cut along a horizontal plane.
The shoulder portion 10b is formed such that the cross-sectional shape (inner diameter) of the shoulder portion 10b when cut along a horizontal plane is reduced toward the upper side.

The container body 10 of the present embodiment has a neck portion 10c extending upward from the upper end of the shoulder portion 10b in a tubular shape having a diameter smaller than that of the body portion 10a.
In the resin container 1 of the present embodiment, the lid body 20 is removed and the container body 10 in an opened state is turned upside down so that the spout 12 faces downward, and the housing portion 11 is pinched from the front and back with fingertips. As described above, the liquid container C can be taken out by applying pressure to the container 11 and pouring it out from the pouring port 12.
The resin container 1 illustrated in the present embodiment is a dropping container in which the liquid container C is dropped from the spout 12 in the opened state.
Since the container body 10 of the present embodiment has the neck portion 10c, it is possible to prevent the entire amount of the liquid content C from being dripped from the spout 12 by its own weight when it is directed downward.
Further, in the container body 10 of the present embodiment, since the container 11 has excellent flexibility, the amount of the liquid container C dropped from the spout 12 can be easily adjusted by adjusting the applied pressure. can do.

The neck portion 10c in the present embodiment is a flow path for the liquid container C on the upstream side of the spout 12 when the liquid container C stored in the body portion 10a is discharged to the outside through the spout 12. Is formed.
In order to prevent the liquid container C from unintentionally entering the neck 10c and forming a liquid pool, the neck 10c has an inner diameter (diameter of the flow path of the liquid container C) of 0.5 mm. It is preferably formed to have any of the above ranges of 8.0 mm or less.
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.
The inner diameter is 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 It may be 0.0 mm or less, more preferably 2.8 mm or less, even more preferably 2.5 mm or less, even more preferably 2.0 mm or less, and 1.8 mm or less. Is particularly preferable.

The resin container 1 illustrated in the present embodiment has the neck portion 10c as described above, but at least a part of the flow path of the liquid container C on the upstream side of the spout 12 is as described above. The fact that it is preferable to have such a diameter is the same in a resin container 1x having no neck portion as shown in FIG.
The resin container 1x shown in FIG. 6 includes a container body 10x having a spout 12x, and a lid 20x that closes the spout 12x and seals the container body, and the container body 10x. Also has a holding portion 14x and the like described later, which is also common to the resin container 1 shown in FIGS.
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 spout 12x is opened at the upper end of the shoulder portion 10bx extending above the body portion 10ax. It's different.
However, the fact that the formation of the liquid pool can be suppressed by having a predetermined diameter on the upstream side in the flow direction of the liquid container C when the liquid container C is extracted from the spout 12 is shown in FIG. ~ It is common with the resin container 1 shown in FIG.
Specifically, at the upper end of the shoulder portion 10bx, which serves as a flow path for the liquid container C on the upstream side of the spout 12, the inner diameter within the range as described above until reaching the spout 12 ( For example, the resin container 1 shown in FIGS. 1 to 5 is common in that the formation of the liquid pool can be suppressed by setting the thickness to 0.5 mm to 8.0 mm.

The internal cross-sectional area (S ₀ ) of the body portion 10a related to the formation of the liquid pool and the cross-sectional area (S ₁ ) of the flow path at the portion having the above diameter have a predetermined width. Preferably there is.
The internal cross-sectional area (S ₀ ) of the body 10a (the area inside the inner wall surface when cut along a horizontal plane) is preferably 20 mm ² or more, more preferably 25 mm ² or more, and 30 mm. Particularly preferably, it is ² or more.
The internal cross-sectional area (S ₀₎ is, 300 mm ² or less, 260 mm ² or less, 220 mm ² or less, may be at 180 mm ² or less, preferably 140 mm ² or less, more preferably 120 mm ² or less, 100 mm It is particularly preferably ² or less.
The ratio (S ₀ / S ₁ ) of the internal cross-sectional area (S ₀ ) of the body portion 10a and the cross-sectional area (S ₁ ) of the flow path is preferably 1.5 or more, and is 2 or more. Is more preferable, 5 or more is more preferable, and 10 or more is particularly preferable.
The above (S ₀ / S ₁ ) is preferably 60 or less, more preferably 50 or less, further preferably 40 or less, and particularly preferably 30 or less.

The body portion 10a of the present embodiment does not have to be cylindrical as in the above example.
In that case, it is preferable that the largest part of the body, which is a part that is compressed by a fingertip or the like when pouring out the liquid container, has the internal cross-sectional area (S ₀ ) as described above. It is preferable that the central portion in the height direction is formed to have the internal cross-sectional area (S ₀ ) as described above.

The inner diameter of the neck portion 10c (the diameter of the flow path) is usually the cross-sectional area of a figure defined by the inner surface of the neck portion 10c when the neck portion 10c is cut along a plane orthogonal to the flow direction of the liquid container C. It can be obtained as the diameter of a circle having the same area as the cross-sectional area.
The inner diameter can be similarly obtained in the resin container 1x shown in FIG. 6, and the diameter of the flow path can be obtained by obtaining the cross-sectional area of the upper end portion of the shoulder portion 10bx instead of the cross-sectional area of the neck portion. .

The neck portion 10c is preferably provided with a portion having the above-described preferable inner diameter in a length of 0.5 mm or more and 12 mm or less.
The length is more preferably 0.7 mm or more, and further preferably 0.9 mm or more.
The length is more preferably 10 mm or less, further preferably 8 mm or less.

The container body 10 of the present embodiment further includes a holding portion 14 which is a hollow rectangular plate and extends downward from the lower end of the housing portion 11.
More specifically, the container body 10 of the present embodiment has a bottle-shaped accommodation space above the hollow plate-shaped holding portion 14 having a vertically long rectangular shape in a front view. There is.
In the container body 10 of the present embodiment, only the bottle-shaped portion can store the liquid container C, and the hollow portion of the holding portion 14 is in communication with the internal space of the housing portion 11. It is an isolated space.
Here, the internal volume of the container body 10 means the volume of a portion that can store 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 rectangular plate-shaped holding portion 14 is provided, information such as the product name and the expiration date can be displayed on the holding portion.
In addition, when it is desired to secure a large volume in the accommodating portion 11, the holding portion 14 may be reduced or eliminated as necessary.

The connecting body 100 in the present embodiment connects the side edges of the body portion 10a to each other so as to connect the side edges of the holding portion 14 to each other so as to connect the side edges of the body portion 10a in a vertically extending linear shape. The adjacent resin containers 1 are connected to each other by the second connecting portion 32 that is connected so as to form a linear shape extending vertically, and the five resin containers 1 are connected.
The connecting body 100 in the present embodiment is a molded product by the blow fill seal method as described later.
Therefore, the resin container 1 according to the present embodiment can prevent foreign matter from being mixed when the liquid container C is contained in the container 11.
The resin container 1 in the present embodiment is used as a unit dose container in which the amount of the liquid container C contained is small as described above.

  When the liquid container C is taken out from the resin container 1, first, as shown in FIG. 2, the connecting portions of the first connecting portion 31 and the second connecting portion 32 of the connecting body 100 are broken. , One resin container 1 is taken out from the connecting body 100, and then the lid body 20 is removed from the resin container 1 taken out from the connecting body 100 to open the container body 10 as shown in FIG. The procedure may be adopted.

The connecting body 100 of the present embodiment can apply a force to separate the adjacent resin containers 1 without using a tool such as scissors or a cutter knife to break the connecting portions 31 and 32 only by hand force. it can.
Further, the space between the container body 10 and the lid body 20 of the resin container 1 of the present embodiment can also be broken by hand without using a tool.
Conventionally, when one resin container is broken from a connecting body, saw-tooth-shaped irregularities are easily formed on the connection parts 31 'and 32' after the break, and burrs are formed on the peripheral portion of the spout. It is easy to be beaten.
The concavities and convexities in the connection parts 31 'and 32' after the breakage may adversely affect the tactile sensation when holding the resin container.
Further, burrs on the peripheral portion of the spout may hinder the normal dropping of the liquid droplets of the liquid containing material that should otherwise be dropped due to gravity.
However, in the present embodiment, since the resin container 1 is made of a specific material, it is possible to prevent the above problems from occurring.

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

In the container body 10 containing the liquid container C, the first layer L1 forming the inner wall surface contains the cyclic olefin copolymer (COC), so that the liquid container C can be appropriately wetted.
This and the fact that the neck portion 10c has an appropriate inner diameter suppresses the formation of a liquid pool in the neck portion 10c in the present embodiment.
In the present embodiment, since the second layer that is in contact with the first layer L1 from the outside is provided, even if the thickness of the first layer L1 is reduced, the total thickness of the container body 10 is reduced by the second layer L2. Can be a certain value or more.
Therefore, in the present embodiment, it is possible to secure a container thickness that can suppress the occurrence of liquid leakage from the container body 10 due to pinholes and the like.

In the present embodiment, the PE-LD is included in the second layer L2, so that the container body 10 can exhibit flexibility.
Further, in the present embodiment, since PE-LLD is contained in the first layer L1 together with COC, the first layer L1 and the second layer L2 are different from those in the case where PE-LLD is not contained. Affinity can be improved.
Therefore, when the first layer L1 and the second layer L2 are heat-sealed to be laminated and integrated, excellent adhesion is exhibited between them, and delamination occurs between them. Can be suppressed.

It is generally known that when a polyethylene resin sheet is torn, thread-like burrs (projections) are likely to be formed on the fracture surface, and if the resin container 1 of the present embodiment is formed of polyethylene resin alone, it will be broken. There is a risk that burrs may be formed on the connection portions 31 ′ and 32 ′ of the above and the peripheral portion of the spout 12.
However, in the present embodiment, since the container body 10 has the two-layer structure using the resin as described above, the sawtooth-shaped irregularities at the connection parts 31 ′ and 32 ′ after the breakage are formed. Also, the formation height of burrs formed on the peripheral portion of the spout 12 can be kept low.

The PE-LLD contained in the first layer L1 contains ethylene as a main monomer and has an α-olefin having 4 or more carbon atoms (for example, 1-butene, 1-hexene, 1-octene, 4-methylpentene-1 and the like). ) Can be used as a general comonomer.
The PE-LLD preferably contains 1-hexene or 1-octene as a comonomer, and more preferably contains 1-hexene as a comonomer, from the viewpoint of more significantly exhibiting the effect of the present invention. .

It is preferable that the PE-LLD has a short-chain branch introduced into the molecular structure by the comonomer to reduce the crystallinity and achieve a low density.
The short chain branch is preferably introduced at a ratio of 5 or more and 100 or less per 1000 units of structural units of ethylene, and more preferably at a ratio of 10 or more and 50 or less.
That is, in the PE-LLD, the ratio of the comonomer to the total amount of ethylene is preferably in the range of 0.5 mol% to 10 mol%, and the ratio is in the range of 1 mol% to 5 mol%. Is more preferable.
Then, the PE-LLD is preferably density of 910 kg / m ³ or more, more preferably density of 915 kg / m ³ or more.
The density of the PE-LLD is preferably 930 kg / m ³ or less.
The melt mass flow rate (MFR) of PE-LLD is preferably 0.5 g / 10 min or more, more preferably 0.6 g / 10 min or more.
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.

The melt mass flow rate of the PE-LLD and the PE-LD is described in JIS K7210: 2014 "Plastics-Method for determining melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastic-Part 1: Standard It can be determined based on the method A (mass measurement method) described in “Test method”, and 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 determined under the conditions of a temperature of 260 ° C. and a notarized load of 2.16 kg.

  The PE-LLD may be either a polymerized product with a multi-site catalyst such as a Ziegler-Natta catalyst or a polymerized product with a single-site catalyst such as a metallocene catalyst.

  The first layer L1 of the present embodiment may contain not only one type of PE-LLD but also two or more types of PE-LLD.

  The COC contained in the first layer L1 together with the PE-LLD as described above is obtained by addition-copolymerizing one or more norbornene-based monomers and ethylene by a known method, or It is hydrogenated according to a conventional method, and specifically has a structure represented by the following general formula (1).

(Here, R ¹ and R ² in the formula (1) are the same or different and each represents hydrogen, a hydrocarbon residue, or a polar group of halogen, ester, nitrile, or pyridyl. R ¹ and R 2 ² may combine with each other to form a ring, x and z are integers of 1 or more, and y is 0 or an integer of 1 or more.)

The COC has a glass transition temperature (Tg) of preferably 60 ° C or higher, more preferably 63 ° C or higher, further 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, further preferably 110 ° C or lower, further preferably 100 ° C or lower, and 90 ° C or lower. It is particularly preferable that
The “glass transition temperature (Tg)” in the present specification is, unless otherwise specified, in accordance with JIS K7121, a midpoint glass specified by measurement at a temperature rising rate of 10 ° C./min. Means the transition temperature.
When using 2 or more types of COC, Tg of COC is specified as a weighted average of each cyclic olefin resin.

Considering the moldability of the resin container 1, the proportion of the constituent units derived from the norbornene-based monomer in COC is preferably 70% by mass or less.
The proportion is more preferably 68% by mass or less, further preferably 66% by mass or less, and particularly preferably 64% by mass or less.
The proportion 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.

  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. Trademark) ”and the like.

  The COC preferably has a melt flow rate (MFR (260 ° C., 2.16 kg)) of 10 g / 10 min or more and 40 g / 10 min or less from the viewpoint of moldability and mechanical properties of the molded product.

  The first layer L1 is preferably blended with 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, further preferably 110 ° C or lower, further preferably 100 ° C or lower, and 90 ° C or lower. It is particularly preferable that

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 the present embodiment contains more COC than PE-LLD.
The proportion of COC in the total amount of COC and PE-LLD contained in the first layer L1 is preferably more than 50% by mass, more preferably 55% by mass or more, and 60% by mass or more. Is particularly preferable.
The proportion is preferably 95% by mass or less, more preferably 90% by mass or less, and particularly preferably 85% by mass or less.
In other words, the proportion of PE-LLD in the total amount of COC and PE-LLD in the first layer L1 is preferably 5% by mass or more and less than 50% by mass.

The resin container 1 of this embodiment is formed by blow molding, and more specifically, formed by a blow fill seal method.
Therefore, in the resin container 1, for example, air is blown into the high temperature parison whose outer side is the second layer L2, and the parison that is pressed outward from the inner side is brought into contact with the molding die. Can be made with.

The first layer L1 may contain additive components (rubber / plastic chemicals, fillers such as fillers, antioxidants, other resins, etc.) in addition to COC and PE-LLD. The content is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less.
It is particularly preferable that the first layer L1 is substantially composed of COC and PE-LLD.

The second layer L2, which is in contact with the first layer L1 from the outside so as to form the container body 10 together with the first layer L1, contains PE-LD.
PE-LD forming the second layer L2 is preferably density of 910 kg / m ³ or more 930 kg / m ³ or less, preferably not more than 915 kg / m ³ or more 925 kg / m ^3.

PE-LD preferably has a bulky molecular structure as described above and has many entangled molecular chains.
Specifically, it is preferable that the PE-LD forming the second layer L2 is a polymer obtained by a high-pressure polymerization method and long-chain branches are present in the molecular structure.
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, and further preferably 1.1 g / 10 min or less. It is particularly preferably 1.0 g / 10 min or less.
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.

The second layer L2 contains, in addition to PE-LD, a small amount of additive components (rubber / plastic chemicals, fillers such as fillers, antioxidants, colorants, other resins, etc.). However, the content is preferably 5% by mass or less, more preferably 3% by mass or less, and further preferably 1% by mass or less.
It is particularly preferable that the second layer L2 is substantially composed of PE-LD.

The thickness of each of the first layer L1 and the second layer L2 varies depending on the application of the resin container 1 and the like, but as illustrated in the present embodiment, the capacity of the liquid container C in the container portion 11 In the case of a small container having a volume of 10 mL or less, it is preferable to set the total thickness of both to be 0.15 mm or more and 1 mm or less.
It should be noted that the accommodating portion 11 is preferably thin and easily deformable in order to urge the taking out of the liquid container C from the spout 12 by increasing the internal pressure in the container, but there is no fear of tearing. As described above, it is preferable to have 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 constitutes a storage space for the liquid storage object C at least in the storage portion 11. In the place where it exists, it is preferably 0.2 mm or more, more preferably 0.24 mm or more, and further 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 further 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 0.15 mm or more and 0.30 mm or less. Is more preferable.
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 0.15 mm or more and 0.5 mm or less. Is more preferable.

  The liquid container C contained in the container 11 has fluidity. It is not particularly limited, and examples thereof include foods and drinks (beverages, seasonings, medicines, nutrients, etc.), external preparations (skin care agents, hair care agents, cosmetic eye drops such as makeup cosmetics, contact lens agents, etc.). Ophthalmic compositions, nasal drops, disinfectants, mouthwashes, repellents, etc.), functional agents (detergents, softeners, fragrances, deodorants, adhesives, etc.) and the like.

Among the liquid containers C, the ophthalmic composition is suitable as the liquid container C to be contained in the resin container 1 of the present embodiment in that it is required to drop an appropriate amount.
Examples of the ophthalmic composition to be contained in the resin container 1 include eye drops, eye drops for contact lenses, artificial tears, eye wash (synonymous with eye wash or eye wash), contact lens mounting agent, contact lens care product. (Including a disinfectant, a preservative, a cleaning agent, etc.) and the like.

The resin container 1 of the present embodiment can be manufactured by the "blow fill seal method" in which the liquid container C as described above is stored when the resin container 1 is manufactured.
To give a specific example, the resin container (connected body) of the present embodiment can be manufactured as follows.
(1) Blow Step A melt-kneaded product obtained by melt-kneading raw materials (cyclic olefin copolymer (COC), linear low-density polyethylene resin (PE-LLD)) for forming the first layer is the inside, A raw material for forming the second layer (low-density polyethylene (PE-LD)) is melt-kneaded to obtain a melt-kneaded product, which is extruded so that the parison has a two-layer structure. The parison is sandwiched by a split mold configured to form a cavity corresponding to the connecting body when the mold is closed, and air is pressed into the parison, or a vacuum hole provided on the molding surface of the split mold. Either or both of suctioning the parison is further performed, and the parison is provided with the shape of each part such as the accommodating portion and the holding portion.
However, at this point, a lid body is not formed, and a connection body in which the spouts of the individual resin containers are opened is produced.
(2) Filling Step A nozzle is inserted into the accommodation portion of each resin container through the pouring port, and a predetermined amount of the liquid accommodation material is flowed out from the nozzle to accommodate the liquid accommodation material in the accommodation portion.
(3) Sealing Step After the predetermined amount of the liquid storage object is stored in the storage section, the lid section is formed so as to close the spout.

The connected body of the present embodiment can be manufactured by a method other than the above.
Further, in the present embodiment, the case where the resin container is manufactured in the state of the connected body is illustrated, but the resin container does not need to be manufactured so as to form the connected body.
Furthermore, in the present embodiment, the connected body and the individual resin container having a specific shape are illustrated, but the resin container of the present invention is not limited to such an example. .
For example, although the case where the resin container has a two-layer structure is illustrated in the present embodiment, the resin container of the present invention has another functional layer (gas permeation preventive layer) outside the second layer. Layer, a water vapor permeation preventive layer, a light ray permeation preventive layer, and a contained substance permeation preventive layer).
As described above, the present invention is not limited to the above examples.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

A resin container having a connected body as shown in FIG. 1 was produced, and the liquid pool at the neck was evaluated.
The raw materials used for these evaluations are as follows.

<Sample 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” (manufactured by Polyplastics Co., Ltd.))
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” (manufactured by Mitsui Chemicals, Inc.))
PE-LLD:
Linear low-density polyethylene (density 920kg / m ³ , melt flow rate 0.95g / 10min (190 ° C))
PE-LD:
Low density polyethylene (density 922 kg / m ³ , melt flow rate 0.60 g / 10 min (190 ° C))

<Evaluation>
2 provided with a first layer (inner layer) containing a cyclic olefin copolymer and a linear low-density polyethylene in a blending ratio (%) shown in Table 1 and a second layer containing low-density polyethylene (outer layer) 2 A resin container having a layered structure was produced. Further, a resin container having 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 was manufactured by the blow-fill-seal method so as to form a connected body in which five resin containers were connected.
The lid of the resin container was twisted to make an opening.
Prepare a buffer solution (containing 0.6% by mass of sodium hydrogen phosphate and 0.07% by mass of sodium dihydrogen phosphate) and push the accommodating part with the opening of the resin container facing downward to remove the air inside. The buffer solution was slightly expelled, the opening was brought into contact with the liquid surface of the buffer solution, and the buffer solution was sucked up from the opening section by relaxing the force pushing the container section.
The force of pushing the container was adjusted so that the amount of the buffer solution would fill the neck of the container.
Next, the container was fixed so that the opening faced upward, and the time until the liquid level of the opening decreased by 10% of the neck length was measured (time A).
The amount of buffer solution in the neck at time A was measured.
Similarly, the buffer solution was sucked up from the resin container of each test example, and the amount of the buffer solution in the neck was measured when time A had elapsed from the time when the container was fixed so that the opening faced upward.
According to Equation 1, the degree of residual improvement of the liquid in the neck was calculated.

[Formula 1]
Residual improvement rate (%) = {1- (liquid amount in neck of container of Example / liquid amount in neck of container not containing COC)} × 100

The container of each test example was measured 5 times, and the average of the residual improvement degree was defined as the residual improvement degree of the test example. The results of evaluation according to the evaluation criteria are shown in the table.

⊚: Residual improvement rate of 30% or more ◯: Residual improvement rate of 20% or more and less than 30% Δ: Residual improvement degree of less than 20%

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

  1: resin container, 10: container main body, 11: accommodating portion, 12: spout, 14: holding portion, 20: lid, 31, 32: connecting portion, 100: connecting body, L1: first layer, L2 : Second layer

Claims (8)

A container body made of resin for containing a liquid container,
The container body has a body for containing the liquid container, and a spout having a smaller diameter than the body,
The inner wall surface of the container body in contact with the liquid container contains a cyclic olefin copolymer,
A resin container in which at least a part of the flow path of the liquid container on the upstream side of the spout has a diameter of 0.5 mm or more and 8.0 mm or less.   The resin container according to claim 1, wherein a proportion of the cyclic olefin copolymer in the resin forming the inner wall surface is 55% by mass or more and 98% by mass or less.   The resin container according to claim 1, wherein the inner wall surface further contains a linear low-density polyethylene resin. The resin container according to claim 1, wherein an internal cross-sectional area (S ₀ ) of the body is 20 mm ² or more and 300 mm ² or less. The resin container according to claim 4, wherein a ratio (S ₀ / S ₁ ) of the internal cross-sectional area (S ₀ ) of the body portion and the cross-sectional area (S ₁ ) of the flow path is 1.5 or more and 60 or less. .   The resin container according to any one of claims 1 to 5, wherein the container body has a volume of 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. The container body constitutes a connected body in which a plurality of containers are connected,
In the connected body, the plurality of container bodies arranged so that the opening direction of the spout is upward are arranged side by side, and adjacent resin containers are connected to each other by a connecting portion provided at a side edge portion. Cage,
The resin container according to any one of claims 1 to 7, wherein the connecting body is an integrally molded product, and the connecting body can be individually separated by breaking the connecting portion.