JPH06286087A - Multilayer film and container - Google Patents

Abstract

PURPOSE:To maintain sealing and dropping strengths, transparency and flexibility even at the time of sterilization at a specific temperature or higher by incorporating normal chain ethylene.alpha-olefin copolymer of specific density in an outer layer, an intermediate layer and an inner layer of a polyolefin multilayer film and mixing polypropylene in the inner layer and a specific % of high density polyethylene in the entire layer. CONSTITUTION:A multilayer film is formed of polyolefin resin. Its multilayer contains normal chain ethylene.alpha-olefin copolymer having a density of 0.920-0.950g/cm<3>, an intermediate layer contains at least one layer of the same copolymer having a density of 0.920g/cm<3> or less, an inner layer contains a mixture of the same copolymer having a density of 0.940g/cm<3> or less with 20-40wt.% of polypropylene, the entire layer contains high density polyethylene having a density of 0.960g/cm<3> or more, the outer layer and the intermediate layer contain 15-55wt.% and the inner layer contains 5-50wt.% of it. In this case, the outer layer needs transparency, flexibility, mechanical strength and heat resistance. The intermediate layer uses resin having high flexibility, impact resistance and transparency, and the inner layer can endure against sterilization at a high temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer film and a container formed by using the multilayer film. Specifically, it is used in the medical field, especially for containing chemicals,
In particular, it is suitable for use in a multi-chamber container in which two or more kinds of drugs and the like are individually contained and can be mixed when used.

[0002]

2. Description of the Related Art Conventionally, in a medical plastic container, two or more kinds of drugs such as amino acid solution and sugar / electrolyte solution, antibiotic agent and dissolution solution are separately stored, and they are aseptically used. In order to be able to blend into
Various containers having a plurality of chambers have been studied. An example thereof is a container in which an easily peelable weld is formed between two chambers by using a mixed resin of polyethylene and polypropylene (JP-A-2-4671).

However, since heat resistance is not taken into consideration so much in the above, sterilization under high temperature conditions such as high-pressure steam sterilization and hot water sterilization lowers seal strength and drop strength, and further deforms. Cause deterioration of transparency and flexibility. In particular, when the sterilization temperature condition is set to a severe condition of 120 ° C. or higher, not only the strength is remarkably lowered, but also the easily peelable welded portion is weakened, which causes a serious defect.

On the other hand, in order to improve the heat resistance, the resin composition and the density 0.930 g / cm ³ or less of the radical polymerization low-density polyethylene and a density 0.945 g / cm ³ or more high-density polyethylene used for the inner and outer layers , A density of 0.
920 g / cm ³ or less linear low density polyethylene and a density 0.945 g / cm ³ or more medical bag having a three-layer structure which arranged resin composition of high-density polyethylene has been proposed (JP-4- 266759).

However, the above-mentioned container is not yet sufficiently satisfactory in heat resistance, and since the provision of the easily peelable welding portion is not considered at all, it cannot be naturally used in a multi-chamber container.

[0006]

In order to solve the above problems, the present invention provides the following multilayer film and container.

That is, the multilayer film of the present invention is a multilayer film composed of a polyolefin resin,
(1) The outer layer has a density of 0.920 g / cm ³ or more and 0.95.
A linear ethylene / α-olefin copolymer of 0 g / cm ³ or less is contained, and (2) the intermediate layer has a density of 0.920 g / c.
It has at least one layer containing a linear ethylene / α-olefin copolymer having a molecular weight of ³ or less, and the inner layer (3) has a density of 0.
A resin containing 940 g / cm ³ or less of a linear ethylene / α-olefin copolymer in which polypropylene is blended in a proportion of 20% by weight or more and 40% by weight or less, and a density of 0.960 g / cm ^{3 in} all layers. The above high-density polyethylene is blended, and the blending ratio is 15% by weight in the outer layer and the intermediate layer
It is characterized in that it is in the range of 55% by weight or more and the inner layer is in the range of 5% by weight or more and 50% by weight or less.

In a preferred embodiment of the multilayer film of the present invention, the inner layer has a density of 0.920 g / cm ³ or more and 0.940.
A resin in which polypropylene is blended in a linear ethylene / α-olefin copolymer of g / cm ³ or less at a ratio of 25% by weight or more and 40% by weight or less, and a density of 0.960 g / cm ³
It can be shown that the above-mentioned high-density polyethylene is used, and the blending ratio of the latter is in the range of 5% by weight or more and 20% by weight or less.

In a more preferred embodiment of the multilayer film of the present invention, (1) the outer layer has a density of 0.930 g / cm ³ to.
A linear ethylene / α-olefin copolymer of 0.945 g / cm ³ is contained, and (2) the intermediate layer has a density of 0.885 g.
/ Cm ^{3 to} 0.905 g / cm ³ linear ethylene / α
-Having at least one layer containing an olefin copolymer,
(3) The inner layer has a density of 0.930 g / cm ^{3 to} 0.940.
g / cm polypropylene linear ethylene · alpha-olefin copolymer ³ comprises a resin which is blended in an amount of 20 to 40 wt%, all layers, density 0.960 g / cm ³
The above high-density polyethylene is blended, and the blending ratio thereof is in the range of 15 to 55% by weight in the outer layer and the intermediate layer,
The inner layer may be in the range of 5 to 50% by weight.

In an even more preferred embodiment of the multilayer film of the present invention, (1) the outer layer contains a linear ethylene / α-olefin copolymer having a density of 0.940 g / cm ³ , and (2) the intermediate layer. , Density 0.905 g / cm ³ or 0.
A layer containing a linear ethylene · alpha-olefin copolymer of 885 g / cm ³ at least one layer (3) inner layer, density 0.930 g / cm ³ or 0.9
High-density polyethylene with a density of 0.960 g / cm ³ or more in all layers, including a resin in which 40 g / cm ³ of a linear ethylene / α-olefin copolymer is mixed with polypropylene in a proportion of 20 to 40% by weight. Can be blended, and the blending ratio can be in the range of 15 to 35% by weight in the outer layer and the intermediate layer and in the range of 5 to 20% by weight in the inner layer.

As a specific embodiment included therein, the following multilayer films can be mentioned.

First embodiment: the outer layer has a density of 0.940 g /
cm ³ of a linear ethylene / α-olefin copolymer containing 20 wt% of high density polyethylene having a density of 0.965 g / cm ³ , and the intermediate layer having a density of 0.905 g / cm ^3. Made of a resin in which high density polyethylene having a density of 0.905 g / cm ³ is blended in a ratio of 30% by weight to the linear ethylene / α-olefin copolymer, and the inner layer is a linear chain having a density of 0.930 g / cm ³ . Ethylene / α
-Olefin copolymer contains 20% by weight of high density polyethylene having a density of 0.965 g / cm ³ and a density of 0.9.
It is made of a resin in which 10 g / cm ³ of polypropylene is blended in a proportion of 30% by weight.

Second embodiment: the outer layer has a density of 0.940 g /
cm ³ of a linear ethylene / α-olefin copolymer containing 20 wt% of high density polyethylene having a density of 0.965 g / cm ³ , and the intermediate layer having a density of 0.885 g / cm ^3. Of a linear ethylene / α-olefin copolymer of 30% by weight of high density polyethylene having a density of 0.965 g / cm ³ , and the inner layer having a linear density of 0.940 g / cm ³ . Ethylene / α
-The olefin copolymer contains 14 wt% of high density polyethylene having a density of 0.965 g / cm ³ and a density of 0.9.
It is made of a resin in which 10 g / cm ³ of polypropylene is blended in a proportion of 33% by weight.

Third embodiment: the outer layer has a density of 0.940 g /
cm ³ of a linear ethylene / α-olefin copolymer containing 20 wt% of high density polyethylene having a density of 0.965 g / cm ³ , and the intermediate layer having a density of 0.905 g / cm ^3. A first resin comprising a linear ethylene / α-olefin copolymer of 30% by weight of high density polyethylene having a density of 0.965 g / cm ³ .
Layer and linear ethylene / α with a density of 0.930 g / cm ³
A second layer comprising a resin in which a high density polyethylene having a density of 0.965 g / cm ³ is blended in an olefin copolymer in a proportion of 20% by weight, and a linear ethylene / α-olefin having a density of 0.905 g / cm ^3. Copolymer density 0.965 g /
cm ³ of high-density polyethylene mixed at a ratio of 30% by weight, and a third layer made of a resin laminated in this order, and the inner layer having a density of 0.930 g / cm ³ of linear ethylene / α-olefin Density 0.965 g / cm for copolymer
³ of high-density polyethylene at a ratio of 20% by weight and polypropylene having a density of 0.910 g / cm ³ at a ratio of 30% by weight.

A high density polyethylene having a density of 0.965 g / cm ³ has a melt flow rate of 15 g / 1.
It can be 0 min (190 ° C.).

The container of the present invention is a container formed by using the above-mentioned film, and in particular, it has two or more chambers, and the space between the chambers is formed by directly heat-sealing the inner surfaces of the film. It is characterized in that they are separated by the easily peelable welded portions.

The present invention will be described in detail below.

Linear ethylene used in the film of the present invention
The α-olefin copolymer is composed of ethylene and α as the main components.
A resin having a linear structure having a short branch, which is obtained by copolymerizing an olefin with a low pressure method. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-
Examples thereof include those having 3 to 12 carbon atoms such as undecene and 1-dodecene, and among them, 1-butene and 4-methyl-
A copolymer with 1-pentene is preferably used. The copolymers forming each layer have the following properties.

* Outer layer: Since it requires mechanical strength and heat resistance in addition to transparency and flexibility, the density of the linear ethylene / α-olefin copolymer used is 0.920 g / cm ³ or more and 0.950 g or more. /
0.930 g / cm ³ selected from the range of cm ³ or less
Particularly preferably, it is 0.945 g / cm ³ or less.
The MFR is 0.1 to 20 g / 10 min, preferably 0.2 to 10 g / 10 min, and particularly preferably 0.5 to 5 g.
It is better to use the one with / 10 min. The outer layer is composed of a blend of this and the high density polyethylene described below.

* Intermediate layer It is necessary to use a resin having both high flexibility, impact resistance and transparency, and a linear ethylene / α-olefin copolymer having a density of 0.920 g / cm ³ or less is used. The preferred copolymer has a density of 0.880 g.
/ Cm ³ or more 0.920 g / cm ³ or less of those, more preferred are those density of 0.885 g / cm ³ or more 0.915 g / cm ³ or less, particularly preferable ones, density 0.885 g / Cm ³ or more 0.905g
An example is a resin having a density of / cm ³ or less. Also, the MFR is 0.
1-20g / 10min, preferably 0.2-10g / 10mi
n, particularly preferably 0.5 to 5 g / 10 min.

The intermediate layer may be a single layer, but may have a multi-layer structure with other types of linear ethylene / α-olefin copolymer layers. In that case, as the other type of copolymer, the same ones as those used for the inner layer described later are adopted, and naturally, high density polyethylene is blended in all the layers. Further, the intermediate layer may have a multi-layer structure of layers having different blending amounts of high-density polyethylene.

* Inner layer Linear ethylene / α- with a density of 0.940 g / cm ³ or less
20% by weight to 40% by weight of polypropylene in the olefin copolymer, preferably 25% by weight to 40% by weight
The resin blended in the following proportions is arranged so as to withstand sterilization under high temperature conditions, and the inner surface of the film is directly heat-welded so that the easily peelable welded portion can be formed. The linear ethylene / α-olefin copolymer has a density of 0.
Is preferably selected from 920 g / cm ³ or more 0.940 g / cm ³ or less in the range, 0.930 g / cm ³ or more 0.940 g / cm ³ less is particularly preferable. Further, the MFR is 0.1 to 20 g / 10 min, preferably 0.
2 to 10 g / 10 min, particularly preferably 0.5 to 5 g / 10
It is better to use the min one. The polypropylene to be blended is a homopolymer or a small amount of ethylene, 1-butene, etc. (generally 10% by weight or less, preferably 5% by weight).
Any of the following copolymers with olefins, M
FR is 0.1 to 60 g / 10 min, preferably 1.0 to 4
0 g / 10 min, particularly preferably 1.5-25 g / 10 min
It is better to use the one. The inner layer is composed of a blend of these and the high density polyethylene described below.

The high density polyethylene compounded in each layer of the film of the present invention is a homopolymer of ethylene or α such as 1-butene, 1-hexene or 4-methyl-1-pentene.
-A copolymer with an olefin is used, from 0.960
0.970g / cm ³ Especially MFR of 10-30g / 10mi
It is better to use n. Further, among such high-density polyethylene, Mw / Mn (M
Those having w: weight average molecular weight determined by GCP and Mn: number average molecular weight determined by GCP) of 4.0 or less, particularly 3.5 or less are preferable for maintaining transparency of the film. The blending ratio in each layer is 15% by weight or more and 55% by weight or less in the outer layer and the intermediate layer, preferably 15% by weight or more and 35% by weight or less, and 5% by weight or more and 50% by weight or less in the inner layer, preferably 5% by weight. % And 20% by weight
Below. If it is less than the above range, sufficient heat resistance cannot be obtained, and if it is more than the above range, flexibility and transparency are deteriorated.

The multilayer film of the present invention formed by the above resin layers has a thickness of 100 to 700 μm, preferably 150 to 300 μm as a whole, which is suitable for medical purposes, and the ratio of the thickness of each layer is: Outer layer: Middle layer: Inner layer = 5
-30: 90-40: 5-30, preferably 5-25:
90-50: 5-25, more preferably 5-20: 90
It is desirable to be set to 60: 5 to 20.

As the method for producing the film of the present invention, a water-cooled or air-cooled coextrusion inflation method and a coextrusion T
A die method, a dry lamination method, an extrusion lamination method and the like can be mentioned, but a water-cooled coextrusion inflation method and a coextrusion T-die method are preferable from the viewpoints of performance, particularly transparency, economy and hygiene. As a matter of course, the conditions of the manufacturing method are set to appropriate temperatures, speeds, etc. so as not to cause deterioration of the resin.

The container of the present invention has a predetermined shape and size obtained by cutting and heat-welding the tube-shaped or sheet-shaped film obtained as described above by a usual method, and further attaching a mouth member and the like by means such as heat-welding. Are manufactured. In particular, when manufacturing a multi-chamber container, the easily peelable welded portions between the chambers can be formed by heat welding under conditions milder than the heat welding conditions for the peripheral portion. Examples of such a multi-chamber container include those shown in FIGS. In FIGS. 1 and 2, 1 is a multi-chamber container body, 2 is an upper chamber, 3 is a lower chamber, 4 is an easily peelable welding part for separating the upper and lower chambers 2 and 3.

[0027]

[Effect] The multilayer film and container of the present invention do not deteriorate in seal strength and drop strength even when subjected to sterilization under severe temperature conditions of 120 ° C. or higher, and further undergo deformation or decrease in transparency and flexibility. There is nothing to do. Moreover, when the container of the present invention is used as a multi-chamber container, the easily peelable welded portion between the chambers can be formed by direct heat welding under milder conditions than the heat welding conditions of the peripheral portion, so that easy peeling between the films is possible. The troublesomeness of inserting the flexible tape is eliminated, and the molding of the multi-chamber container becomes easy. Further, the multi-chamber container thus obtained has a stable easily peelable welding part even after the above-mentioned sterilization, and there is no fear that the separately stored medicines will be mixed, so that medical products such as infusion bags can be used. It can be preferably used as a container for use.

[0028]

EXAMPLES Examples of the present invention will be described below.

The resins are indicated by the following abbreviations. In the following, all MFRs are ASTM D 1
238.

HP = high density polyethylene (ethylene
1-butene copolymer) [Mitsui Petrochemical; Density 0.965 g / cm ³ , MFR
15 g / 10 min (190 ° C.)] Mw / Mn = 2.8 ・ PE = linear medium-density polyethylene (ethylene-1-
Butene Copolymer) [Mitsui Petrochemical; Density 0.940 g / cm ³ , MFR
2.1 g / 10 min (190 ° C)]-PE = linear low-density polyethylene (ethylene-1-
Butene copolymer) [Mitsui Petrochemical; Density 0.905 g / cm ³ , MFR
1.4 g / 10 min (190 ° C)]-PE = linear low-density polyethylene (ethylene-1-
Butene Copolymer) [Mitsui Petrochemical; Density 0.895 g / cm ³ , MFR
1.0 g / 10 min (190 ° C)]-PE = linear medium-density polyethylene (ethylene-1-
Butene Copolymer) [Mitsui Petrochemical; Density 0.930 g / cm ³ , MFR
2.1 g / 10 min (190 ° C)]-PE = linear low-density polyethylene (ethylene-1-
Butene Copolymer) [Mitsui Petrochemical; Density 0.885 g / cm ³ , MFR
5.0 g / 10 min (190 ° C.)] PP = isotactic polypropylene [Mitsui Petrochemical; Density 0.910 g / cm ³ , MFR
7.1 g / 10 min (230 ° C.)]-PP = isotactic polypropylene [Mitsui Petrochemical; Density 0.910 g / cm ³ , MFR
3.0 g / 10 min (230 ° C.)] First, a laminated sheet having a synthetic resin and a layer constitution shown in Table 1 was produced by a water-cooled coextrusion inflation method. Subsequently, using each laminated sheet, a two-chamber medical bag having a total internal volume of 500 ml as shown in FIGS. 1 and 2 was formed. The conditions for heat welding during molding of the container were 180 ° C. for 4 seconds at the peripheral portion of the bag and 140 ° C. for 3 seconds at the easily peelable welding portion.

In Table 1, for example, in the outer layer of Example 1, PE (1) and HP are PE (1): HP = 80:
Thickness obtained by mixing at a ratio of 20 (weight ratio) is 15 μm
It means that it is a layer.

Furthermore, the obtained medical container was filled with distilled water and subjected to high-pressure steam sterilization treatment at 121 ° C. for 30 minutes, and visually examined for deformation, bag breakage, wrinkles, and blocking conditions, and heat resistance was evaluated. It was used as an index of sex. Similarly, the degree of clouding of the container was examined and used as an index of transparency. in addition,
The natural discharge property of the content liquid was visually observed and used as a flexibility index.
Further, the heat-welded states of the peripheral edge welded portion and the easily peelable welded portion of the medical container before and after the sterilization treatment were visually observed, and the heat-welded state was used as an index of the weldability. Then, a comprehensive judgment was made based on all the indexes.

In Table 1, ⊚ indicates very good, ∘ indicates good, × indicates poor, and − indicates unmeasurable.

[0034]

[Table 1]

From Table 1 above, it is clear that the film and container of the present invention are excellent in sufficiently resisting sterilization at high temperature and maintaining strength, flexibility and transparency.

[Brief description of drawings]

FIG. 1 is a front view of a multi-chamber container molded from the multilayer film of the present invention.

FIG. 2 is a side view of the same.

[Explanation of symbols]

 1 multi-chamber container body 2 upper chamber 3 lower chamber 4 easily peelable weld

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

First embodiment: the outer layer has a density of 0.940 g /
becomes linear ethylene · alpha-olefin copolymer cm ³ in density polyethylene having a density of 0.965 g / cm ³ from the resin in proportions of 20 wt%, the intermediate layer is, density 0.905 g / cm ³ the linear ethylene · alpha-olefin copolymer in a high-density polyethylene having a density of 0.9 6 5g / cm ³ a resin which is blended in an amount of 30 wt%, the inner layer is, the density of 0.930 g / cm ³ Linear ethylene / α
-Olefin copolymer with 20 wt% of high density polyethylene having a density of 0.965 g / cm ³ and a density of 0.9.
It is made of a resin in which 10 g / cm ³ of polypropylene is blended in a proportion of 30% by weight.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

In Table 1, for example,
Layer is PE And HP with PE : HP-80: 20 (heavy
A layer having a thickness of 15 μm obtained by mixing at a ratio of
It means that.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

Furthermore, the medical container obtained, 121 ° C. after filling with distilled water, subjected to high pressure steam sterilization for 30 minutes, deformation by visual observation, examine breakage, wrinkles, a state of blocking, heat It was used as an index of sex. Similarly, the degree of clouding of the container was examined and used as an index of transparency. in addition,
The natural discharge property of the content liquid was visually observed and used as a flexibility index.
Further, heat welding state of the peripheral weld portion and easy peelability welded portion of the medical container in the sterilization process before and after was visually observed, and the weldability of the indicator with the heat welding conditions. Then, a comprehensive judgment was made based on all the indexes.

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B65D 65/40 D 9028-3E 77/08 A 9145-3E

Claims (10)

[Claims] 1. A multilayer film composed of a polyolefin resin, wherein (1) the outer layer has a density of 0.920 g.
/ Cm ³ or more and 0.950 g / cm ³ or less containing a linear ethylene / α-olefin copolymer, (2) the intermediate layer,
Linear ethylene / α- with a density of 0.920 g / cm ³ or less
Having at least one layer containing an olefin copolymer,
(3) The inner layer contains a resin in which polypropylene is blended in a linear ethylene / α-olefin copolymer having a density of 0.940 g / cm ³ or less at a blending ratio of 20% by weight or more and 40% by weight or less. The layer is blended with high-density polyethylene having a density of 0.960 g / cm ³ or more, and the blending ratio is
A multilayer film, wherein the outer layer and the intermediate layer are in the range of 15% by weight to 55% by weight, and the inner layer is in the range of 5% by weight to 50% by weight. 2. The inner layer comprises a linear ethylene / α-olefin copolymer having a density of 0.920 g / cm ³ or more and 0.940 g / cm ³ or less and polypropylene of 25% by weight or more and 40% or more.
Resin blended in a proportion of less than or equal to wt% and a density of 0.960
The multi-layer film according to claim 1, which is composed of high-density polyethylene of g / cm ³ or more, and the blending ratio of the latter is in the range of 5 wt% to 20 wt%. 3. A multilayer film composed of a polyolefin resin, wherein (1) the outer layer has a density of 0.930 g.
/ Cm ^{3 to} 0.945 g / cm ³ linear ethylene / α
An olefin copolymer, and (2) the intermediate layer has at least one layer containing a linear ethylene / α-olefin copolymer having a density of 0.885 g / cm ^{3 to} 0.905 g / cm ^3. , (3) the inner layer has a density of 0.930 g / cm ³
To 0.940 g / cm ³ of a linear ethylene / α-olefin copolymer containing polypropylene in a proportion of 20 to 40% by weight, and all layers having a density of 0.960 g / cm ³ or more. The high-density polyethylene of the invention is compounded, and the compounding ratio thereof is in the range of 15 to 55% by weight in the outer layer and the intermediate layer, and in the range of 5 to 50% by weight in the inner layer. 4. A multilayer film composed of a polyolefin resin, wherein (1) the outer layer has a density of 0.940 g.
/ Cm ³ of a linear ethylene / α-olefin copolymer, and (2) the intermediate layer has a density of 0.905 g / cm ³ or 0.885 g / cm ³ of a linear ethylene / α-olefin copolymer. (3) the inner layer has a density of 0.930 g / cm ³ or 0.940 g /
cm ³ of a linear ethylene / α-olefin copolymer containing a resin in which polypropylene is blended at a ratio of 20 to 40% by weight, and all layers are made of high density polyethylene having a density of 0.960 g / cm ³ or more. 4. The multi-layer film according to claim 3, wherein the multi-layer film is blended in a proportion of 15 to 35% by weight in the outer layer and the middle layer and in a range of 5 to 20% by weight in the inner layer. 5. The outer layer is a linear ethylene / α-olefin copolymer having a density of 0.940 g / cm ³ and a density of 0.96.
5 g / cm ³ of a high-density polyethylene blended at a ratio of 20% by weight, and the intermediate layer is a linear ethylene / α-olefin copolymer having a density of 0.905 g / cm ³ and a density of 0.965 g / cm ₃
Made of a resin containing 30% by weight of high-density polyethylene, the inner layer of which is linear ethylene / α with a density of 0.930 g / cm ^3.
-Olefin copolymer containing 20 wt% of high density polyethylene having a density of 0.965 g / cm ³ and a density of 0.9.
The multilayer film according to claim 4, which comprises a resin in which 10 g / cm ³ of polypropylene is blended in a proportion of 30% by weight. 6. A linear ethylene / α-olefin copolymer having a density of 0.940 g / cm ³ and a density of 0.96.
5 g / cm ³ of high-density polyethylene mixed at a ratio of 20% by weight, and the intermediate layer is a linear ethylene / α-olefin copolymer having a density of 0.885 g / cm ³ and a density of 0.965 g / cm ³
Made of a resin containing 30% by weight of high-density polyethylene, the inner layer of which is linear ethylene with a density of 0.940 g / cm ^3.
The α-olefin copolymer contains 14% by weight of high density polyethylene having a density of 0.965 g / cm ³ and a density of 0.
The multilayer film according to claim 4, wherein 910 g / cm ³ of polypropylene is a resin blended in a proportion of 33% by weight. 7. The outer layer comprises a linear ethylene / α-olefin copolymer having a density of 0.940 g / cm ³ and a density of 0.96.
5 g / cm ³ of a high-density polyethylene blended at a ratio of 20% by weight, and the intermediate layer is a linear ethylene / α-olefin copolymer having a density of 0.905 g / cm ³ and a density of 0.965 g / cm ³
Of the high density polyethylene of 30% by weight and a linear ethylene / α-olefin copolymer having a density of 0.930 g / cm ³ and a density of 0.965.
A second layer made of a resin containing 20% by weight of high density polyethylene of g / cm ³ and a density of 0.905 g / c
A linear ethylene / α-olefin copolymer of m ^{3 and} a third layer made of a resin in which high density polyethylene having a density of 0.965 g / cm ³ is blended at a ratio of 30 wt% are laminated in this order. , The inner layer is linear ethylene with a density of 0.930 g / cm ^3.
High density polyethylene having a density of 0.965 g / cm ³ was added to the α-olefin copolymer at a ratio of 20% by weight and a density of 0.
The multilayer film according to claim 4, which is made of a resin in which 910 g / cm ³ of polypropylene is blended at a ratio of 30% by weight. 8. A high-density polyethylene having a density of 0.965 g / cm ³ has a melt flow rate of 15 g / 10 min.
It is (190 degreeC), The multilayer film in any one of Claims 5-7. 9. A container formed by using the film according to claim 1. 10. A container having two or more chambers formed by using the film according to claim 1, wherein the inner surfaces of the film are directly heat-welded between the chambers. A container characterized in that it is separated by an easily peelable welding portion formed by the above.