JPH0924587A - Laminate, zipper bag and compression bag - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: Reopening and closing of a laminate having at least a three-layer structure excellent in transparency, impact resistance, gas barrier property, low-temperature heat-sealing property, and moldability, and foods made of the laminate. To provide a compressed storage bag for degassing and compressing a zipper bag, futon, etc. SOLUTION: An outer layer made of a specific ethylene (co) polymer, an intermediate layer made of a high density polyethylene (C) having a specific density and a resin having a specific blending ratio of the ethylene (co) polymer, and an ethylene type. The problem can be solved by a laminate including at least a heat-sealing layer having a heat-sealing temperature of 120 ° C. or less, and a zipper bag and a compression storage bag made of these laminates, which are made of a (co) polymer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminate having at least a three-layer structure which is excellent in transparency, impact resistance, gas barrier property, low-temperature heat-sealing property, and moldability, and a zipper bag made of the laminate. It relates to a compression storage bag. The laminate is widely used as a packaging material for foods, newspapers, magazines, machinery and the like, and these zippered bags have excellent transparency and airtightness, and are used for foods, pharmaceuticals, industrial products, clothing,
Widely used as a resealable packaging bag for miscellaneous goods.
In addition, a thermoplastic resin chuck with airtightness is a packaging bag for long-term storage of food, a packaging bag for fluid food,
Further, it is widely used as a compression storage bag for deaeration and compression storage of clothing and futons.

[0002]

2. Description of the Related Art Conventionally, high-pressure low density polyethylene, linear low density polyethylene, high density polyethylene film and the like have been used as packaging materials. However, high-pressure low-density polyethylene is inferior in impact resistance, gas barrier property and stiffness, and high-density polyethylene is inferior in transparency and impact resistance. On the other hand, linear low density polyethylene is excellent in transparency and impact resistance, but is inferior in gas barrier property, stiffness and moldability. For this reason, there is no resin that can satisfy transparency, impact resistance, waist strength, gas barrier property, moldability, etc. comprehensively in a single layer film, and in order to satisfy these requirements, a laminated film made of various polyethylene resins Is proposed.

For example, Japanese Patent Laid-Open No. 59-112252 proposes a laminated film using a mixture of high density polyethylene and linear low density polyethylene in the intermediate layer and linear low density polyethylene in both outer layers. Japanese Unexamined Patent Publication (Kokai) No. 58-59080 discloses a laminated film using high-density polyethylene for the intermediate layer, linear low-density polyethylene for the outer layer, and high-pressure low-density polyethylene or ethylene-based copolymer for the other outer layers. More specifically, a laminated film using high-density polyethylene and an ethylene-based copolymer for the intermediate layer, linear low-density polyethylene for the outer layer, and high-pressure low-density polyethylene or ethylene-based copolymer for the other outer layer. Is disclosed in Japanese Patent Laid-Open No. 59-38.
059 discloses a laminate using high-density polyethylene for the intermediate layer and linear low-density polyethylene for both outer layers. Specifically, high-density polyethylene and linear low-density polyethylene are used for the intermediate layer, and both outer layers are disclosed. A laminated body using linear low-density polyethylene can be mentioned.

However, the above-mentioned laminated film is excellent in impact resistance, stiffness, gas barrier property, etc., but inferior in transparency and moldability. Excellent in strength, gas barrier property, moldability, etc., but poor in transparency. The laminated body of 1 is excellent in impact resistance, waist strength, gas barrier property, etc., but has a problem of poor transparency and moldability.

Recently, when a bag is manufactured and used as a bag, the low-temperature heat-sealing property and
It is strongly desired to improve the adhesive strength of the seal portion. However, the above-mentioned conventional laminated film has a high heat-sealing temperature of the inner layer during bag making, and thus does not improve the productivity during bag making.

As the zipper bag, a bag made of a general polyethylene resin is widely used in various fields (for example, Japanese Patent Publication No. 59-29500, Japanese Patent Publication No. 60-50663, and Japanese Unexamined Patent Publication No. Sho 60-50663). 58-171347
Japanese Patent Laid-Open No. 61-203354).

These zipper bags are generally made of a single-layer film and are made of low-density polyethylene (hereinafter LD).
PE), linear low density polyethylene (hereinafter, LLD
Polyethylene resins such as PE) and high density polyethylene (hereinafter referred to as HDPE) are used. However, although LDPE is excellent in transparency, it has a drawback that it is inferior in gas barrier property and impact resistance, and its rigidity is weak. In addition, LLDPE is insufficient in gas barrier property, rigidity and moldability. Further, although HDPE has characteristics such as gas barrier property, impact resistance, and waist strength, it has a problem of poor transparency.

Further, as the zipper bag, there is a laminated bag mainly used for food. The polyolefin single-layer zipper bag is highly productive and inexpensive because the zipper and bag can be integrally molded, but as described above, transparency, impact resistance, waist strength, gas barrier property, and moldability are provided. Such things are not totally satisfactory.

On the other hand, the laminated bag has polyamide (PA), polyvinylidene chloride-coated biaxially oriented polypropylene (KOP), biaxially oriented polypropylene (OPP), ethylene-vinyl alcohol copolymer (EVOH), polyester as a gas barrier layer. (PET), aluminum vapor deposition film, etc. are used. Therefore, the gas barrier property is very high, but there is a problem that the manufacturing cost is high and the cost is high. Therefore, also in the field of foods and the like, there is a demand for a zipper bag which has a higher gas barrier property, is excellent in transparency, impact resistance, rigidity and formability, and is cheaper than a conventional laminated zipper bag.

Similarly, a compression storage bag for storing clothing, futon, etc. is required to have the same performance as above. Further, when the laminated body is heat-sealed to form a laminated bag and the zipper tape is heat-sealed to the opening to form the zipper bag, the low temperature heat-sealing property of the inner layer of the laminated bag is required. When the heat-sealing temperature is high, the heat-sealing portion does not become smooth and the appearance is poor, or the two zipper tapes are often fused and do not form a bag. Further, it is required to lower the heat sealing temperature in order to increase the productivity of the zipper bag.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a laminate excellent in transparency, impact resistance, stiffness, gas barrier property, low temperature heat sealability, moldability and the like. . Another object of the present invention is to provide a zipper bag, a compression storage bag and a zipper compression storage bag using such a laminated body.

[0012]

The inventors of the present invention have made extensive studies to solve the above-mentioned problems, and as a result, achieved the above-mentioned object by using a laminate of a specific resin, and arrived at the present invention. . Further, by using such a laminated body of the specific resin, the zipper bag, the compression storage bag, and the zipped compression storage bag of the present invention can be provided.

That is, the first invention of the present invention is (A) an ethylene / α-olefin copolymer having a density of 0.86 to 0.94 g / cm ³ and / or (B) an ethylene polymer obtained by a high pressure radical polymerization method. An outer layer comprising at least one ethylene-based (co) polymer selected from (C) a high density polyethylene having a density of 0.94 to 0.97 g / cm ³ .
An intermediate layer comprising a resin in an amount of from 0 to 50% by weight and up to 50% by weight of at least one ethylene (co) polymer of the component (A) and / or (B), and (A ') density of 0.86.
~ 0.94 g / cm ³ of ethylene and α of 6 to 12 carbon atoms
-It is composed of an ethylene-based (co) polymer whose main component is a copolymer with olefin, and has a heat-sealing temperature of 1
It is intended to provide a laminate including at least a heat seal layer having a temperature of 20 ° C. or lower.

The second invention of the present invention is (A) a density of 0.86.
An outer layer composed of at least one ethylene-based (co) polymer selected from ethylene-α-olefin copolymers of about 0.94 g / cm ³ and / or (B) an ethylene polymer by a high-pressure radical polymerization method; (C) Density 0.94 ~
0.97 g / cm ³ high density polyethylene 100-50
An intermediate layer consisting of 50% by weight of a resin of up to 50% by weight of the ethylene-based (co) polymer of the above-mentioned component (A) and / or component (B), and (A ′) density of 0.86 to 0.94 g / cm ³ . It is composed of an ethylene-based (co) polymer whose main component is a copolymer of ethylene and an α-olefin having 6 to 12 carbon atoms,
A chuck made of a thermoplastic resin having male and female claws is formed in an opening of a bag body including a laminate including a heat-sealing layer having a heat-sealing temperature of 120 ° C. or lower. A bag is provided.

The third aspect of the present invention is (A) a density of 0.86.
An outer layer composed of at least one ethylene-based (co) polymer selected from ethylene-α-olefin copolymers of about 0.94 g / cm ³ and / or (B) an ethylene polymer by a high-pressure radical polymerization method; (C) Density 0.94 ~
0.97 g / cm ³ high density polyethylene 100-50
An intermediate layer comprising 50% by weight of a resin of up to 50% by weight of at least one ethylene-based (co) polymer of the component (A) and / or (B), and (A ') a density of 0.86 to 0.94.
A heat-sealing layer composed of an ethylene-based (co) polymer having a copolymer of g / cm ³ of ethylene and an α-olefin having 6 to 12 carbon atoms as a main component and having a heat-sealing temperature of 120 ° C. or lower. The present invention provides a compressed storage bag made of a laminated body including and.

[0016]

The laminated body of the present invention has (A) a density of 0.86 to 0.8.
94 g / cm ³ of ethylene / α-olefin copolymer and / or (B) at least one ethylene-based (co) selected from ethylene polymers obtained by a high-pressure radical polymerization method
Polymer as an outer layer, (C) density 0.94 to 0.97 g /
cm ³ is an intermediate layer mainly composed of high-density polyethylene,
(A ') is composed of an ethylene-based (co) polymer mainly composed of a copolymer of ethylene having a density of 0.86 to 0.94 g / cm ³ and an α-olefin having 6 to 12 carbon atoms, and is heat-resistant. By forming the laminated body including at least the heat-sealing layer having a sealing temperature of 120 ° C. or lower, the density of 0.
Despite having a resin of 94 to 0.97 g / m ³ mainly composed of high-density polyethylene as an intermediate layer, it has transparency that cannot be predicted, and has gas barrier property, impact resistance, and elasticity. A laminated body that retains strength and has excellent low-temperature heat-sealing properties, shortens the heat-sealing cycle during bag making, significantly improves productivity, and improves high-speed moldability. Further, a zipper bag and a compression storage bag using such a laminated body are excellent in high-speed bag-making property and have high productivity such as chuck formation, and these bags are excellent in transparency, gas barrier property and resistance to gas. It also has impact resistance and waist strength.

The present invention will be described in more detail below with reference to the drawings. FIG. 1 shows a cross-sectional view of one embodiment of the laminated body of the present invention. In FIG. 1, the laminate 1 of the present invention is
At least one ethylene-based (copolymer selected from (A) an ethylene / α-olefin copolymer having a density of 0.86 to less than 0.94 g / cm ³ and / or (B) an ethylene polymer obtained by a high-pressure radical polymerization method. ) Outer layer 2 composed of a resin layer made of a polymer, and (C) density 0.94 to 0.97 g
/ Cm ³ high-density polyethylene 100 to 50% by weight and an intermediate layer 3 composed of a resin layer of up to 50% by weight of the ethylene-based (co) polymer, and (A ′) density 0.86 to 0.
Ethylene less than 94 g / cm ³ and α- with 6 to 12 carbon atoms
It is composed of an ethylene-based (co) polymer whose main component is a copolymer with an olefin, and has a heat-sealing temperature of 120.
It is a laminated body having at least a three-layer structure of the heat-sealing layer 4 composed of a resin layer having a temperature of not higher than ° C.

In FIG. 1, the outer layer 2 has a role of maintaining impact resistance, transparency, molding processability and the like of the laminate 1, and the component (A) or the component (B) may be used alone. A mixed composition of the component (A) and the component (B) is preferable in consideration of the best balance of molding processability and impact resistance. A preferred combination of the outer layers 2 (A)
The mixing ratio of the mixed composition of the component and the component (B) is 60 to 95% by weight of the component (A), 40 to 5% by weight of the component (B), preferably 70 to 90% by weight of the component (A), and (B). Ingredient 30 ~
10% by weight, more preferably 75 to 90% by weight of component (A) and 25 to 10% by weight of component (B). If the compounding amount of the component (B) exceeds 40% by weight, there is a risk that the balance between moldability and impact resistance may not be maintained. Further, in order to improve the moldability of the outer layer 2, it is desirable to add a lubricant such as a higher fatty acid or its metal salt or amide.

The above (A) density is 0.86 to 0.94 g /
An ethylene / α-olefin copolymer having a size of less than cm ³ is
Ethylene and α having 3 to 12 carbon atoms by high / medium / low pressure method using Ziegler type catalyst and other known methods
-Copolymer with olefin, density 0.91-0.9
LLDPE less than 4 g / cm ³ , density 0.86-0.
Ultra low density polyethylene less than 91 g / cm ³ (hereinafter VL
DPE), and a density of 0.86 to 0.91 g /
An ethylene / α-olefin copolymer rubber such as an ethylene-propylene copolymer rubber or an ethylene-propylene-diene copolymer rubber having a cm ^{3 or} less is included. Especially LLD
In PE or VLDPE, the (A ′) density used as a heat-sealing layer described later is 0.86 to 0.91.
A copolymer of ethylene of less than g / cm ³ and an α-olefin having 6 to 12 carbon atoms is also included in the component (A).

The above Ziegler type LLDPE means ethylene having a density of 0.91 to less than 0.94 g / cm ³ , preferably 0.91 to 0.93 g / cm ^3.
It is an α-olefin copolymer and has an MFR of 0.05 to 3
It is selected in the range of 0 g / 10 min, preferably 0.1 to 20 g / min. The molecular weight distribution (Mw / Mn) is not particularly limited, but it is generally in the range of 3.0 to 13, preferably 3.5 to 8. The α-olefin used as a comonomer of the LLDPE has 3 to 20 carbon atoms, preferably 4 to 12 carbon atoms, and more preferably 6 to 12 carbon atoms.
The range is 12, and specific examples thereof include 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene and the like. If the MFR is less than 0.05 g / 10 minutes, the moldability will be deteriorated, and if it exceeds 30 g / 10 minutes, the impact resistance and heat seal strength may be deteriorated.

VLDPE with the above Ziegler type catalyst
Is an ethylene / α-olefin copolymer having a density of 0.86 to less than 0.91 g / cm ³ , preferably 0.88 to 0.905 g / cm ³ , and an MFR of 0.01 to.
It is selected in the range of 20 g / 10 minutes, preferably 0.1 to 10 g / 10 minutes. The VLDPE is LLDPE and ethylene / α-olefin copolymer rubber (EPR, EPD).
M) is a polyethylene showing an intermediate property, and has a maximum peak temperature (Tm) of 6 by differential scanning calorimetry (DSC).
It is a specific ethylene / α-olefin copolymer having a property of 0 ° C. or higher, preferably 100 ° C. or higher, and boiling n-hexane insoluble content of 10% by weight or higher, and a high crystal part and ethylene / α-shown by LLDPE. It is a resin that has a combination of the amorphous part shown by olefin copolymer rubber, and the former characteristics, such as impact resistance and heat resistance, and the latter characteristics, such as rubber-like elasticity and low temperature impact resistance, coexist in a well-balanced manner. are doing.

The ethylene / α-olefin rubber used in the present invention includes ethylene-propylene copolymer rubber and ethylene-propylene-diene copolymer rubber having a density of 0.86 to less than 0.91 g / cm ^3. Examples of the ethylene / α-olefin copolymer rubber include a random copolymer (EPM) containing ethylene and propylene as main components, and a diene monomer (dicyclopentadiene, ethylidene norbornene, etc.) as a third component. Random copolymer (EPD)
M).

Examples of the ethylene polymer by the high pressure radical polymerization method (B) used in the present invention include ethylene homopolymers (low density polyethylene, LDPE) having a density of 0.91 to 0.94 g / cm ³ by the high pressure radical polymerization method, Ethylene
Examples thereof include a vinyl ester copolymer and a copolymer of ethylene and an α, β-unsaturated carboxylic acid or its derivative.

The above low density polyethylene (LDPE) is
MFR is 0.05 to 30 g / 10 minutes, preferably 0.1
It is selected in the range of up to 20 g / 10 minutes. Within this range, the melt tension of the composition will be in an appropriate range and film forming and the like will be easy. LDPE density is 0.91-0.9
4 g / cm ³ , preferably 0.912 to 0.935 g /
cm ³ , more preferably 0.912 to 0.930 g /
It is selected in the range of cm ³ . In addition, the molecular weight distribution (Mw /
Mn) is 3.0 to 12, preferably 4.0 to 8.0. The production of these LDPEs is a known high pressure radical polymerization method, and may be either a tubular method or an autoclave method.

The ethylene / vinyl ester copolymer used in the present invention is produced by a high pressure radical polymerization method, and is composed of ethylene and vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate. , A copolymer with a vinyl ester monomer such as trifluorovinyl acetate. Among them, particularly preferred is vinyl acetate.
That is, a copolymer comprising 50 to 99.5% by weight of ethylene, 0.5 to 50% by weight of a vinyl ester, and 0 to 49.5% by weight of another copolymerizable unsaturated monomer is preferable. Further, the vinyl ester content is selected in the range of 3 to 20% by weight, particularly preferably 5 to 15% by weight. The MFR of these copolymers is selected in the range of 0.1 to 20 g / 10 minutes, preferably 0.3 to 10 g / 10 minutes.

Typical copolymers of ethylene of the present invention with α, β-unsaturated carboxylic acids or their derivatives include ethylene / (meth) acrylic acid or its alkyl ester copolymers. Examples of these comonomers include acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, acrylic acid-n. -Butyl, n-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl acrylate, lauryl methacrylate, stearyl acrylate, stearyl methacrylate,
Examples thereof include glycidyl acrylate and glycidyl methacrylate. Among these, alkyl esters of (meth) acrylic acid such as methyl and ethyl are particularly preferable. The content of the (meth) acrylate is in the range of 3 to 20% by weight, preferably 5 to 15% by weight. The MFR of these copolymers is 0.1
-30 g / 10 min, preferably 0.2-20 g / min.

Among the specific preferable combinations of the above outer layers, (A) LLD is preferable in terms of transparency, moldability and impact resistance.
Most preferred is a mixed composition of PE and (B) LDPE.

In FIG. 1, the intermediate layer 3 of the present invention has (C) a density of 0.94 to 0.97 g / m ³ in order to maintain the rigidity of the laminate 1 and various physical properties such as gas barrier properties. HD
It is composed of a resin whose main component is PE. The intermediate layer 3 may be HDPE alone, but preferably the above HDPE,
A mixed composition with at least one ethylene-based (co) polymer selected from the component (A) and / or the component (B) is desirable because it satisfies the above physical properties in a well-balanced manner. The mixing composition ratio of the resin forming the intermediate layer 3 of the present invention is 5 to 40% by weight of ethylene-based (co) polymer, preferably 90 to 70% by weight of HDPE and 95 to 60% by weight of HDPE, and ethylene. 10 to 3 based (co) polymer
It is desirable to select in the range of 0% by weight. When the blending amount of the ethylene (co) polymer exceeds 40% by weight, performance such as stiffness and gas barrier property may be deteriorated.

A specific preferred combination of the intermediate layer 3 of the present invention is HDPE having a density of 0.95 to 0.97 g / cm ³ .
And LLDPE, VLDPE, ethylene / α-olefin copolymer rubber, and the like, but satisfying various physical properties of the laminate 1 such as transparency, impact resistance, stiffness, and molding stability. Therefore, the combination of HDPE and VLDPE is most preferable.

The above (C) HDPE has a density of 0.94.
To 0.97 g / cm ³ , preferably 0.95 g / cm ^3.
In the above HDPE, specifically, an ethylene homopolymer or ethylene and a carbon number of 3 to 12 produced by a known process such as a slurry method, a solution method or a gas phase method using a known Ziegler catalyst. Of α-olefins and mixtures thereof, and specific α-olefins include propylene, 1-butene, 4
-Methyl-1-pentene, 1-hexene, 1-octene, 1-dodecene, and the like. Particularly preferred among these α-olefins are those having 4 to 8 carbon atoms.
Is an α-olefin.

The heat-sealing layer 4 of the present invention plays a role of maintaining the transparency, heat-sealing property, molding processability, impact resistance and the like of the laminate 1. The heat seal layer 4 is required to have high heat seal strength at low temperatures and an effect of improving transparency in order to maintain high-speed moldability during bag making. The resin forming the heat seal layer 4 has a (A ′) density of 0.86 to 0.94 g /
An ethylene (co) polymer mainly composed of a copolymer of ethylene of less than ³ cm ³ and an α-olefin of 6 to 12 carbon atoms, and composed of a resin layer having a heat sealing temperature of 120 ° C. or less. It is what is done.

The heat seal layer 4 has a (A ') density of 0.86 to 0.94 g in order to satisfy high-speed moldability and the like.
/ Cm ³ less than the ethylene copolymer of the α- olefin having 6 to 12 carbon atoms and a resin composed mainly, its heat-sealing temperature of 120 ° C. or less, preferably 115 ° C. or less, more preferably 110 It is important that the temperature is not higher than 0 ° C, and (A ') a copolymer of ethylene having a density of 0.86 to less than 0.94 g / cm ³ and an α-olefin having a carbon number of 6 to 12 may be used alone, but it is transparent. In order to maintain heat-sealing properties, impact resistance, and further improve molding processability, at least one ethylene (co) polymer selected from the above-mentioned component (A) and / or (B) is used. It is desirable to incorporate a small amount of coalescence. The blending amount of these ethylene (co) polymers is selected in the range of 5 to 30% by weight. If the blending amount exceeds 30% by weight, the transparency, heat seal characteristics, impact resistance, etc. may be impaired.

The (A ') density used in the present invention is 0.86 to.
The copolymer of ethylene of less than 0.94 g / cm ³ and an α-olefin having 6 to 12 carbon atoms is a specified copolymer of the component (A) of the ethylene-based (co) polymer. The component (A ′) preferably has a density of 0.90 to
Less than 0.94 g / cm ³ , MFR 0.05 to ³⁰ g /
It is desirable that the ethylene / α-olefin copolymer has a heat-sealing temperature of 120 ° C. or lower, preferably 115 ° C. or lower for 10 minutes, preferably 0.1 to 10 g / 10 minutes. However, the heat seal layer 4 used in the present invention
Is (A ') density 0.86 to 0.94 g /
When a copolymer of ethylene of less than ³ cm ³ and an α-olefin having 6 to 12 carbon atoms alone has a heat-sealing temperature of 120 ° C. or higher, the component (A ′) has a low melting point. Add other ingredients to increase heat seal temperature to 120
It is important to adjust the temperature below ℃.

The heat sealing temperature of the present invention will be described. A single layer film (80 μm) of resin used for the heat-sealing layer of the laminated body is prepared, and the heat-sealing width is 15 m.
A test piece having a length of m and a length of 80 mm was prepared, the heat sealing time was 1.0 second, and the heat sealing pressure was 1.5 kgf / cm.
Heat seal under conditions of ² , then pulling speed 300mm
/ Min test tensile strength, heat seal strength (kgf
/ Cm ² ). Next, heat sealing is performed while changing the sealing temperature at several points, and the heat sealing strength is determined by a tensile test as described above. A graph of the seal temperature and the heat seal strength was prepared, and the seal temperature at which the heat seal strength was 500 g / 15 mm width was defined as the heat seal temperature in the present invention.

The laminate of the present invention is a laminate having at least a three-layer structure, and if necessary, another thermoplastic resin layer of the same type or different type may be used as the outer layer 2 and the heat seal layer 4 in FIG.
It can be installed between and. Also, outer layer / middle layer /
There is no particular limitation on the layer ratio of each layer of the heat seal layer, and generally, it may be appropriately determined within the range of 0.5 / 9 / 0.5 to 3/4/3. Further, a polyamide layer having an excellent gas barrier property, an ethylene-vinyl alcohol copolymer layer, a polyester layer, or an adhesive layer made of an adhesive resin such as acid-modified polyolefin may be added to the laminate. Further, in the laminate of the present invention, when both outer layers require heat sealability, both layers may be formed by the heat seal layer 4.

A specific example of the laminate of the present invention is A / C.
/ D, A / B / C / D, A / C / B / D, A + B / C /
D, A + B / C + A / D, A + B / C + A / D + B, A
/ C / M / D, A / M / C / D, D / C / D, D + B /
C + A / D + B etc. are mentioned. (However, A: LL
DPE, B: LDPE, C: HDPE, etc.
D: LLDPE using C6 or higher α-olefin,
M: indicates another resin)

As the method for producing the laminate of the present invention, various known methods such as a co-extrusion method, an extrusion lamination method, a San'ditch lamination method, a dry lamination method and a combination thereof can be adopted. Specifically, the outer layer 2, the intermediate layer 3 and the heat seal layer 4 in FIG. 1 are extruded by separate extruders, respectively, and are fed to a die having a multi-layer structure by a coextrusion inflation method or a T-die method. 2, the intermediate layer 3 is melt-extruded, the outer layer 2 and the intermediate layer 3 are extrusion-laminated, and the heat-sealing layer 4 is melt-extruded. The outer layer 2 and the heat-sealing layer 4 are formed in advance. Then, the sandwich lamination method in which the intermediate layer 3 is melt-extruded between the two layers, and the outer layer 2 in advance,
A dry lamination method or the like in which the heat seal layer 4 and the intermediate layer 3 are separately molded and laminated using an adhesive or the like can be used. When the outer layer 2, the intermediate layer 3 and the heat seal layer 4 are preformed in advance, these layers may be stretched uniaxially or biaxially.

In the present invention, an antioxidant, an antiblocking agent, a lubricant, an antistatic agent, an antifogging agent, an ultraviolet absorber, an organic or inorganic filler, an organic or inorganic pigment, and Known additives such as a nucleating agent and a cross-linking agent can be added within a range that does not substantially impair the characteristics of the present invention.

A second aspect of the present invention relates to a zipper bag in which a thermoplastic resin zipper having male and female claws is formed in the opening of the bag body made of the laminated body.
Conventionally, a zipper bag using a polyethylene resin is also well known. For example, those disclosed in JP-B-59-29500, JP-B-60-50663, JP-A-58-171347, JP-A-61-203354 and the like can be mentioned.

These zipper bags are generally made of a single layer film and made of polyethylene resin such as LDPE, LLDPE, HDPE. But L
Although DPE is excellent in transparency, it has a drawback that it is inferior in gas barrier property and impact resistance and its stiffness is weak. Also,
LLDPE has insufficient gas barrier properties, impact resistance, and waist strength. Furthermore, HDPE has a gas barrier property,
Despite the characteristics such as impact resistance and waist strength, there is a problem that the transparency is poor, and in both cases, low temperature heat sealability is inferior, and a resin that has high-speed moldability during bag making is desired. ing. The present invention improves the high-speed moldability such as shortening the heat-sealing cycle at the time of bag making and fusing of the zipper tape by using the above-mentioned specific laminate.

That is, according to the second aspect of the present invention, (A) the density is 0.1.
An outer layer comprising at least one ethylene-based (co) polymer selected from ethylene / α-olefin copolymers having an amount of 86 to less than 0.94 g / cm ³ and / or (B) an ethylene polymer obtained by a high-pressure radical polymerization method. And (C) density 0.
High density polyethylene (C) of 94 to 0.97 g / cm ³
100 to 50% by weight and the ethylene-based (co) polymer 50
Intermediate layer consisting of up to wt% resin and (A ') density of 0.
86 to 0.94 g / cm ^{3 or} less ethylene and 6 to 6 carbon atoms
Heat having a male claw and a female claw at the opening of a bag body composed of a laminate containing a copolymer of 12 with α-olefin as a main component and a heat seal layer having a heat seal temperature of 120 ° C. or lower. The present invention provides a zipper bag characterized by forming a zipper made of a plastic resin.

The present invention will be described in more detail below with reference to the drawings. FIG. 2 shows a plan view of a zipper bag as an example of the present invention. As shown in FIG. 2, the zipper bag of the present invention is
In the vicinity of the opening 6 of the bag body 5, one to a plurality of rows of thermoplastic resin chucks 7 having male and female claws are provided. 2, the bag body 5 of the present invention is composed of the laminated film 1 having the same structure as that of FIG. 1 when cut along the AA cutting line of FIG.

FIG. 3 is a sectional view showing an example of a thermoplastic resin zipper tape having male and female claws used in the present invention. The thermoplastic resin zipper tape 8 is formed by integrally forming a thermoplastic resin zipper having at least one pair of hook-shaped male claw 9 and female claw 10 as a set, and as shown in FIG. In order to further improve the property, one or more rows of chucks may be formed in the bag opening in the vertical direction. In the case of a plurality of rows, the male and female nails are arranged in parallel in the same direction, or The female nails 10 may be alternately arranged at opposite positions. By forming the thermoplastic resin zipper at the opening of the bag in this way, the contents inside the bag can be packaged and stored, and when necessary, only the required amount of the contents can be taken out and the rest can be saved. Can be given.

FIG. 4 is a sectional view showing the construction of the sealing material applied to the thermoplastic resin chuck. The two sets of male pawls (9, 9) and female pawls (1) of the chuck tape 8 shown in FIG.
0, 10) are alternately arranged at the opposite positions and are engaged with each other, and a plurality of ridges 11 are provided on the inner wall of the female claw 10 as a sealing material. By providing a plurality of sealing members for the protrusions 11 in this manner, it is possible to maintain a higher airtightness. The sealing material is made of a soft material such as silicone rubber, soft urethane rubber, or synthetic rubber, and by providing a plurality of convex strips 11, the tip of the male pawl has a convex strip 11 when the male pawl is fitted with the female pawl. The state is closely adhered to, and the airtightness is extremely good even for gas or liquid contents.

As a method for adhering the thermoplastic resin chuck to the opening 6 of the bag body 5 in FIG. 2, the male nail 9 and the female nail 10 which are manufactured in advance in the opening 6 of the bag body 5 are respectively attached with an adhesive. A method of adhering the same, a method of fusing and adhering the male claw 9 and the female claw 10 extruded from the die to the opening 6 of the bag body 5 in a molten state, and forming the male claw 9 and the female claw 10 in advance as shown in FIG. Made of thermoplastic resin zipper tape 8
And the tape 8 is heat-sealed to the opening 6 of the bag body 5. In the present invention, a thermoplastic resin zipper tape, in which male and female claws are formed in advance in order to apply a chuck to the laminated body, is manufactured, and this tape is heat-sealed to the opening 6 of the bag body 5. The method is most preferred.

The thermoplastic resin used for the thermoplastic resin chuck is not particularly limited, but it is preferable to use the same kind of resin as the inner and outer layers of the laminate.
Specifically, high / medium / low density polyethylene, LLDP
E, VLDPE, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers and the like homo resins or mixtures thereof can be mentioned. Further, the male nail and the female nail may be combined with two or more kinds of hard and soft resins.

When the thermoplastic resin zipper tape is adhered to the bag body, corona discharge treatment, ultraviolet ray treatment and ozone treatment are preliminarily applied to the non-fused portion of the surface of the tape on which the male and female nails are formed. By applying a surface treatment such as acid treatment or cross-linking treatment, the effect that the zipper tapes do not fuse to each other is imparted, and conventionally used release paper or the like can be omitted. The surface treatment is preferably performed with a wetting tension of 42 dyne / cm or more. Of these surface treatments, corona discharge treatment is most preferable.

A third invention of the present invention is a compression storage bag using the above-mentioned chuck bag, and has (A1) density of 0.86 to 0.
An outer layer comprising at least one ethylene-based (co) polymer selected from an ethylene / α-olefin copolymer of less than 94 g / cm ³ and / or an ethylene-based (co) polymer by a high-pressure radical polymerization method; C) Density 0.94 ~
An intermediate layer consisting of 100 to 50 wt% of HDPE of 0.97 g / cm ³ and up to 50 wt% of the ethylene-based (co) polymer;
(A2) A heat-sealing layer having a main component of a copolymer of ethylene having a density of 0.86 to less than 0.94 g / cm ³ and an α-olefin having 6 to 12 carbon atoms and having a heat-sealing temperature of 120 ° C. or less. In the opening of the bag body made of a laminated body including and, a zipper bag formed by forming a thermoplastic resin chuck having male and female claws, comprising a transparency, and a gas barrier property, Impact resistance, waist strength,
A compression storage bag that maintains airtightness.

The compression storage bag is used to store the items to be packaged such as a futon and a costume in a bag, and then to evacuate and compress the inside of the bag to decompress and compress the items to be packaged such as a futon and a costume. It is a bag used for mites and long-term storage. Further, it has a feature that space saving of the storage place can be achieved.

Conventionally, a compression storage bag such as a futon storage bag or a garment bag, which is required to have high airtightness, gas barrier property, impact resistance, and waist strength, is well known. For example, JP
-21689, JP-A-56-13362,
JP-A-58-193269, JP-A-1-1393
46, JP-A-1-254554, JP-A-3
-98856, JP-A-4-114867,
JP-A-4-142255, JP-A-4-15455
6 and JP-A-6-24455.

These airtight compression storage bags, etc.
Generally, a laminated bag is used in which a resin having a high gas barrier property such as polyamide, polyester, or saponified product of ethylene-vinyl acetate is used as an intermediate layer, and a seal layer such as a polyethylene resin is provided at least as an inner layer. However, since these high gas barrier resins and polyethylene-based resins generally do not adhere to each other, an adhesive resin is interposed between the high gas barrier resin and the polyethylene-based resin, and the coextrusion molding method or extrusion lamination method is used. Method, sandwich lamination method, dry lamination method, and the like, it is necessary to stack them, and there are problems of economical efficiency such as soaring of equipment cost and raw material cost and complexity of process.

The compression storage bag of the present invention has an intermediate layer mainly composed of high-density polyethylene having an appropriate gas barrier property, and as an outer layer, preferably has relatively good moldability,
A specific ethylene / α-olefin copolymer that has a high impact resistance and is laminated with an ethylene-based (co) polymer mainly composed of LLDPE, and has another low-temperature heat-sealing property and high heat-sealing strength as another outer layer. By providing a heat-sealing layer consisting of, it is possible to dramatically improve transparency as compared with the case of a single layer of HDPE, and it is excellent in moldability, gas barrier property, impact resistance, waist strength, etc. Becomes In addition, because it is composed only of the same kind of inexpensive polyethylene resin, there is no need for adhesive resin as in the past, and there are problems such as economic problems such as soaring equipment costs and raw material costs and complexity of processes. Will be resolved. In addition, the compression storage bag of the present invention has an advantage that the heat sealing cycle time is short and the productivity is good when the zipper tape is heat sealed to the opening.

Further details will be described below with reference to the drawings. FIG. 5A is a plan view of an example of a conventional futon compression storage bag 20, and FIG. 5B is a cross section of the laminated film (laminate) 15 taken along the line BB of FIG. 5A. The figure is shown in FIG.
Is a pair of rims 1 for sealing the futon compression storage bag 20.
8 is a perspective view of the auxiliary tool of 8 and bar 19. FIG.

5 (a), (b) and (c), the storage bag 20 has an intermediate layer 13 made of a resin having a high gas barrier property such as a polyamide resin, and an adhesive layer made of an acid-modified polyolefin resin on both sides thereof. It is composed of a laminated film 15 made of a sealing resin 12 such as a polyethylene resin via a resin 14, and has an opening 16 and a ventilation pipe 17 having a check valve provided at the bottom of the bag. .

6 (a) and 6 (b) are enlarged sectional views of the ventilation pipe 17, and FIG. 6 (a) shows a check valve 21 in the form of a film.
Fig. 6 shows a ventilation pipe 17a equipped with a.
(B) is a ventilation pipe 17 equipped with a check valve 21b in the form of a valve plate.
b is shown (the arrow indicates the exhaust flow direction).

The storage bag 20 is used as follows. After inserting the futon through the opening 16 of the compression storage bag 20,
The opening 16 is pinched and sealed by the pair of rims 18 and the sealing aid of the bar 19 shown in FIG. 5C, and the air inside the bag is sucked from the ventilation pipe 17 with a suction device such as an electric vacuum cleaner. Degas and store the contents under degassing conditions.

FIG. 7 is a plan view of an embodiment of the compression storage bag of the present invention. In FIG. 7, the opening 2 of the compression storage bag 25
A chuck 28 is fused near 6 and a vent pipe 27 having a check valve for deaeration is provided at the bottom of the bag. The ventilation pipe 27 is not limited to the bottom portion, and may be provided at the opening portion, the side portion, the opening side end, or the like. By providing such a ventilation pipe 27, the air in the bag body is sucked by a suction device such as an electric vacuum cleaner, and the bag body is efficiently deaerated and compressed,
The contents can be stored under deaerated conditions. Further, the storage bag storing the contents can prevent the inflow of air by the check valve.

In the above description of the compression storage bag of the present invention, the examples in which the ventilation pipe is provided are given, but the present invention is not limited to these. In addition, the compressed storage bag 25 of the present invention
By providing a plurality of rows of chucks 28 in the vicinity of the opening 26, it is possible to easily re-open and close and maintain airtightness. In particular, by providing a sealing material in the chuck, higher airtightness can be obtained, and a pair of rim and bar for sealing the opening shown in FIG. 5 (c) used in the conventional futon compression storage bag. No need for auxiliary equipment.

The zipper bag and the compression storage bag of the present invention are
Since it is a bag body with excellent impact resistance and strong rigidity, the thermoplastic resin chuck will not easily come off due to the weight of the contents and the force of distorting the bag body due to tipping or compression. It is possible to secure good airtightness. In addition, by providing a sealant inside the chuck, it is possible to maintain high airtightness, and since it has gas barrier properties, it can be used for long-term storage of food, packaging containers for fluid foods and chemicals, and air. It can be widely used as a metal packaging that rusts when touched, a clothing packaging for insects and mildew proofing, and a compression storage bag for degassing and compression storing clothing and bedding.

[0060]

BEST MODE FOR CARRYING OUT THE INVENTION The laminate of the first invention of the present invention comprises:
(A) Ethylene with a density of 0.86 to 0.94 g / cm ³ .
An outer layer is an α-olefin copolymer and / or (B) at least one ethylene-based (co) polymer selected from ethylene polymers produced by a high-pressure radical polymerization method, and (C) a density of 0.94 to 0.97 g. / cm ³ of a high-density polyethylene in the intermediate layer mainly, (a ') density 0.86 to 0.9
A heat-sealing layer composed of an ethylene-based (co) polymer mainly containing a copolymer of 4 g / cm ³ of ethylene and an α-olefin having 6 to 12 carbon atoms and having a heat-sealing temperature of 120 ° C. or lower. It is formed of a laminated body including at least. Despite having an intermediate layer of a resin mainly composed of high-density polyethylene having a density of 0.94 to 0.97 g / m ³ , it has unexpected transparency, gas barrier property, and impact resistance. It is a laminated body that retains the strength of the waist and has excellent low-temperature heat sealability, shortens the heat seal cycle during bag making, and significantly improves productivity.
And high-speed moldability is improved.

The zipper bag of the second invention of the present invention is one in which a thermoplastic resin chuck having male and female claws is formed in the opening of the bag body made of the above-mentioned laminated body and has a high-speed bag-making property. Excellent in productivity such as chuck formation, excellent transparency, gas barrier property, impact resistance, and waist strength.

The compression storage bag of the third invention of the present invention uses the above-mentioned zipper bag in which a thermoplastic resin chuck having male and female claws is formed in the opening of the bag body made of the above laminated body. It is excellent in high-speed bag making, has high productivity such as chuck formation, is transparent, and retains gas barrier properties, impact resistance, waist strength, airtightness, and the like.

[0063]

Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The resin components used in Examples and Comparative Examples are shown below. (A) Component A1: Linear low density polyethylene (LLDPE) [Density = 0.
922 g / cm ³ , MFR = 0.9 g / 10 min, comonomer: 1-butene (C ₄ -1), Nippon Petrochemical Co., Ltd.
Made] A2: Ultra low density polyethylene (VLDPE) [Density = 0.
^{900g / cm 3, MFR = 0.5g} / 10 min, a comonomer: 1-butene (C ₄ -1), Petrochemical Corporation
Made]

Component (B) B1: High pressure radical method low density polyethylene (LDPE)
[Density = 0.924 g / cm ³ , MFR = 2.0 g / 1
0 minutes, manufactured by Nippon Petrochemical Co., Ltd.]

(C) Component C1: High density polyethylene (HDPE) [Density = 0.95
0 g / cm ³ , MFR = 0.9 g / 10 minutes, manufactured by Nippon Petrochemical Co., Ltd.]

Component (A ') A'1: Linear low density polyethylene (LLDPE) [density =
^{. 0. 922g / cm 3, MFR} = 0 5g / 10 min, a comonomer: 1-hexene (C ₆ -1), Petrochemical Co., Ltd.] A'2: linear low density polyethylene (LLDPE) [Density =
0.919 g / cm ³ , MFR = 1.3 g / 10 min, comonomer: 1-octene (C ₈ -1), manufactured by Nippon Petrochemical Co., Ltd.] A'3: Ultra low density polyethylene (VLDPE) [density = 0.
^{900g / cm 3, MFR = 1.0g} / 10 min, a comonomer: 1-hexene (C ₆ -1), Petrochemical Co., Ltd.]

(Physical Property Test Method) Haze: ASTM D1003 compliant Clarity: Murakami Color Research Laboratory Clarity Meter “TM-1D type” transmitted light intensity of film: Tensile elastic modulus: JIS K6758 compliant Dart impact strength: ASTM D1709 〃 Oxygen permeability: MOCON method MOCON method: Measured using an oxygen permeability measuring device (OX-TRAN AN TWIN) manufactured by Modern Controls INC. Measurement conditions: 25 ° C., 65% RH ASTM D3985-81 JIS K7126 B method compliant Heat seal strength: The temperature at which the heat seal strength is determined to be 0.5 Kg / 15 mm width according to JIS Z1707.

[Example 1] Density = 0.950 g / cm
³ , MFR = 0.9 g / 10 min of (C) HDPE as a resin for the intermediate layer, and density = 0.922 g / cm ³ , MFR =
0.5 g / 10 min, comonomer: 1-hexene (A '
1) LLDPE 90% by weight and density = 0.924 g / cm
³ , (B1) LDPE10 for MFR = 2.0g / 10min
Extrusion temperature of 200 ° C., using a three-kind three-layer coextrusion inflation film molding machine (screw diameter 60 mm, three single-screw extruders with L / D = 30) so that the weight% becomes the outer layer and the heat-sealing layer. A film was formed under the condition that the blow-up ratio was 2.0. The layer thickness of the laminated film is 40 μm for the intermediate layer and 20 μm for each of the outer layer and the heat seal layer.
m. The physical properties of the obtained laminated film were measured, and the results are shown in Table 1.

[Examples 2 to 6] Laminated films were formed in the same manner as in Example 1 except that the outer layer, the intermediate layer and the heat seal layer were laminated films having the composition ratios shown in Table 1. The physical properties of the obtained laminated film were measured, and the results are shown in Table 1.

[Comparative Examples 1 to 4] Laminated films were formed in the same manner as in Example 1 except that the outer layer, the intermediate layer and the heat seal layer were laminated films having the composition ratios shown in Table 2. The physical properties of the obtained laminated film were measured, and the results are shown in Table 2.

[Example 7] Using the laminate of Example 1,
Then, a zipper bag was prepared by fusing the zipper tape having airtightness in which three protrusions made of soft urethane were provided on the inner wall of the female claw of the thermoplastic resin chuck to the opening, and the results were evaluated. Similar results were shown.

[Embodiment 8] By forming a vent pipe equipped with a check valve in a part of the bag body obtained in Embodiment 7, a compressed storage bag capable of compressing and storing contents in a deaerated state is manufactured. did. A futon was stored in the compressed storage bag and stored for 8 months, but almost the original compressed state was retained.

[0073]

[Table 1]

[0074]

[Table 2]

[0075]

The laminate of the present invention has (A) a density of 0.86.
To 0.94 g / cm ^{3 of} an ethylene / α-olefin copolymer and / or (B) at least one ethylene-based (co) polymer selected from ethylene polymers prepared by a high-pressure radical polymerization method as an outer layer, C) Density 0.94 to 0.9
(A ') A copolymer of ethylene having a density of 0.86 to 0.94 g / cm ³ and an α-olefin having a carbon number of 6 to 12 is mainly contained in an intermediate layer mainly composed of high density polyethylene of 7 g / cm ³ . The density of 0.94 to 0.97 g / m ³ can be obtained by forming a laminate containing at least a heat-sealing layer having a heat-sealing temperature of 120 ° C. or lower, which is composed of an ethylene-based (co) polymer as a component. Despite having an intermediate layer of resin mainly composed of high-density polyethylene, it has unpredictable transparency, retains gas barrier properties, impact resistance, waist strength, etc., and is low temperature. A laminate having excellent heat sealability was obtained.

Further, the zipper bag and the compression storage bag using such a laminated body are excellent in high-speed bag-making property and high in productivity such as chuck formation, and these bags are excellent in transparency and gas barrier property. It also has impact resistance, waist strength, and airtightness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of a laminate of the present invention.

FIG. 2 is a plan view of a zipper bag as an example of the present invention.

FIG. 3 is a cross-sectional view of a thermoplastic resin zipper tape having male and female claws.

FIG. 4 is a cross-sectional view of a fitting chuck in which a sealing material is put on an inner wall of a female claw.

5A is a plan view of an example of a conventional futon compression storage bag, FIG. 5B is a sectional view of the laminated film taken along the line BB of FIG. 5A, and FIG. It is a perspective view of an auxiliary tool for sealing.

FIG. 6A is an enlarged cross-sectional view of a ventilation pipe, and FIG.
FIG. 6 is an enlarged cross-sectional view of another ventilation pipe.

FIG. 7 is a plan view of the futon compression storage bag of the present invention.

[Explanation of symbols]

 1, 15 Laminated body 2, 12 Outer layer 3, 13 Intermediate layer 4 Heat seal layer 5 Bag body (chuck bag) 6, 16, 26 Opening 7, 28 Chuck 8 Chuck tape 9 Male claw 10 Female claw 11 Convex strip sealing material 14 Adhesive resin layer 17, 17a, 17b, 27 Vent pipe 18 Rim 19 Bar 20 Conventional compression storage bag 21a, 21b Check valve 25 Compression storage bag of the present invention

Claims (5)

[Claims] 1. At least one selected from an ethylene / α-olefin copolymer (A) having a density of 0.86 to 0.94 g / cm ³ and / or an ethylene polymer (B) obtained by a high pressure radical polymerization method. An outer layer made of an ethylene (co) polymer, 100 to 50% by weight of high density polyethylene (C) having a density of 0.94 to 0.97 g / cm ³ and at least one of the components (A) and / or (B). An intermediate layer comprising a resin of up to 50% by weight of an ethylene-based (co) polymer, and a copolymer of ethylene having a density of 0.86 to 0.94 g / cm ³ and an α-olefin having 6 to 12 carbon atoms ( A laminate comprising at least a heat-sealing layer having a heat-sealing temperature of 120 ° C. or lower, which is composed of an ethylene (co) polymer containing A ′) as a main component. 2. A copolymer (A ′) 60-95 of ethylene having a density of 0.89-0.94 g / cm ³ and an α-olefin having a carbon number of 6-12 by a Ziegler type catalyst. The laminate according to claim 1, wherein the composition comprises 5% to 40% by weight of at least one ethylene-based (co) polymer of the other component (A) and / or component (B). 3. At least one selected from an ethylene / α-olefin copolymer (A) having a density of 0.86 to 0.94 g / cm ³ and / or an ethylene polymer (B) obtained by a high pressure radical polymerization method. An outer layer made of an ethylene (co) polymer, 100 to 50% by weight of high density polyethylene (C) having a density of 0.94 to 0.97 g / cm ³ , and the component (A) and /
Or 50% by weight of the (B) component ethylene (co) polymer
Intermediate layer consisting of resin up to and density 0.86-0.94g
Ethylene-based (co) containing as a main component a copolymer (A ′) of ethylene / cm ³ and an α-olefin having 6 to 12 carbon atoms
Composed of polymer and heat sealing temperature of 120 ℃
A zipper bag, characterized in that a zipper made of a thermoplastic resin having male and female claws is formed in an opening of a bag body including a laminated body including the following heat seal layer. 4. At least one selected from an ethylene / α-olefin copolymer (A) having a density of 0.86 to 0.94 g / cm ³ and / or an ethylene polymer (B) obtained by a high pressure radical polymerization method. Outer layer made of ethylene-based (co) polymer, 100-50% by weight of high-density polyethylene (C) having a density of 0.94 to 0.97 g / cm ³ , and ethylene-based component (A) and / or (B) (Co) polymer 5
Intermediate layer consisting of resin up to 0% by weight and density of 0.86-
It is composed of an ethylene-based (co) polymer containing ethylene (less than 0.94 g / cm ³ ) and an α-olefin having 6 to 12 carbon atoms (A ′) as a main component, and has a heat-sealing temperature of 120. A compressed storage bag comprising a laminate including a heat-sealing layer having a temperature of ℃ or less. 5. A compression storage bag, characterized in that a thermoplastic resin chuck having male and female claws is formed in the opening of the compression storage bag according to claim 4.