JP3124213B2 - Laminated film for packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film for packaging having excellent anti-fog properties and excellent slipperiness with a tray or the like, and more particularly to a laminated film for packaging suitably used for stretch packaging or stretch shrink packaging. It is about.

[0002]

2. Description of the Related Art Various packaging methods utilizing the characteristics of each film, such as a film packaging method, include, for example,
There are many methods, such as a bag-like sealing method, an overlap method, a stretch wrap method, and a skin pack method. As a film used for these, a single-layer film mainly using a general-purpose resin such as polyethylene, polypropylene, or polyvinyl chloride is often used. However, with the sophistication and diversification of the demand level for packaging films, or changes in social needs,
The cases where these single-layer films cannot cope are increasing.

[0003] In addition, as a film for stretching packaging or stretch shrink packaging of foods such as fruits and vegetables, fresh fish, raw meat, or prepared foods directly or on a plastic tray, vinyl chloride resin is mainly used. I was However, in recent years, due to health and safety issues and environmental pollution issues,
Development of films made of ethylene-based resins such as low-density polyethylene and ethylene-vinyl acetate copolymer has been actively conducted. However, when a low-density polyethylene resin is used alone, the self-adhesiveness, low-temperature heat adhesion, flexibility, and the like of the target film cannot be simultaneously satisfied. Further, in the ethylene-vinyl acetate copolymer resin, if the vinyl acetate content and the molecular weight are appropriately selected,
Although a film that can solve such a problem to some extent can be obtained, there is a problem that the film is torn if there is a sharp portion in the corner of the tray or the food. In addition, there is a problem that acetic acid odor is transferred to food.

[0004] In order to meet these demands, a method of laminating various films or adding various additives has been used. For example, JP-A-6-0318
82, JP-A-6-039973, Japanese Patent Application No. 5-15036
6 to 150367, or as disclosed in the specification of Japanese Patent Application No. 5-156848, for the purpose of simultaneously satisfying the required performance by combining an ethylene-based polymer layer and a propylene copolymer layer. Multi-layer films have been proposed. Further, Japanese Patent Application Laid-Open No. H06-025620 proposes that a film having excellent self-adhesiveness can be obtained by using two types of ethylene polymers. Further, various antifogging agents are often added in order to impart antifogging property to the packaging film.

[0005] However, a laminate film for packaging in which both outer layers are an ethylene polymer and a core layer is a propylene polymer, and the ethylene polymer of both outer layers is added with an antifogging agent, is an antifogging film. If the effect is sufficiently exhibited, and the addition amount of the antifogging agent is increased so as to improve the slipperiness with the tray or the packaged object, the kneading in the extruder becomes worse and the extrusion amount becomes uneven. Become. In addition, when the amount of the antifogging agent is reduced so that the extrudability is improved, the effect of the antifogging property is reduced, and the lubricity with the tray and the packaged object is also reduced.
Therefore, a packaging film having excellent antifogging properties, good slipperiness, and excellent automatic packaging suitability has not yet been obtained.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laminated film for packaging having both good antifogging property and good slipperiness with a tray or the like. More preferably, an object of the present invention is to provide a packaging laminated film suitably used for stretch packaging of foods and the like placed on a tray, or stretch shrink packaging for further heat shrinking the stretch package.

[0007]

According to the present invention, in a laminated film comprising at least three layers, both outer layers have a density of 0.870 to 0.910 g / cm ³ and an endothermic peak by differential thermal analysis (DSC). Is a melting point of ethylene-α-olefin copolymer (ethylene content is 50 mol% or more) [A], and a density of 0.910 to 0.910.
0.935 g / cm ^{3 of} an ethylene-α-olefin copolymer (ethylene content is 50 mol% or more) [B] and an antifogging agent [C], and the ethylene-α-olefin copolymer The density of [B] is 0.008 g / cm higher than the density of the ethylene-α-olefin copolymer [A].
³ or more, and the density is 0.870 to 0.910 g /
cm ^{3 of} an ethylene-α-olefin copolymer [A];
Ethylene having a density of 0.910 to 0.935 g / cm ³
The weight ratio of the α-olefin copolymer [B] is 9: 1 to 1
6: 4, further comprising a laminated film for packaging, wherein the core layer is made of a propylene-based polymer, and the propylene-based polymer has an ethylene content of 2-1.
2 mol% of propylene - packaging laminate film before SL which is a ethylene copolymer is provided, also, the laminated film, the according to any one characterized by having a heat-shrinkable A laminated film for packaging is provided, and further the laminated film for packaging according to any one of the above, wherein the laminated film is for stretch packaging, and further, the laminated film is for tray packaging. A packaging laminated film according to any one of the above, which is characterized by being provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. Ethylene-α-olefin copolymer used in the present invention (ethylene content is 50 mol% or more) [A]
It is necessary to have a melting point at which the density is in the range of 0.870 to 0.910 g / cm ³ and that there is only one endothermic peak by differential thermal analysis (DSC). If the density is less than 0.870 g / cm ³ , film formation becomes difficult. On the other hand, if the density exceeds 0.910 g / cm ³ , the adhesiveness of the core layer to the polypropylene resin is reduced, and delamination occurs. Further, when the density exceeds 0.910 g / cm ³ , the low-temperature heat adhesion and flexibility become poor, so that it is not preferable for stretch packaging or stretch shrink packaging.

Further, the ethylene-α-olefin copolymer [A] has only one endothermic peak by differential thermal analysis (DSC).
A laminated film for packaging using a resin which is present only in a book is said to improve both anti-fog properties and slip properties by mixing a high density ethylene-α-olefin copolymer [B]. The effects of the invention can be more remarkably exhibited. That is, in both outer layers, the laminated film for packaging using only the ethylene-α-olefin copolymer having only one endothermic peak is only the ethylene-α-olefin copolymer having two endothermic peaks. Bleed-out of the antifogging agent is harder than that of the used laminated film for packaging, and the antifogging property is inferior. However, by mixing the ethylene-α-olefin copolymer (B) having a high density, even when the ethylene-α-olefin copolymer (A) having only one endothermic peak is used, the antifogging agent is used. Bleed out easily, and ethylene-α- having two endothermic peaks
An antifogging property comparable to the case of using the olefin copolymer (A) can be obtained, and as described above, the sliding property can be improved.

The differential thermal analysis (DSC) in the present invention
Endothermic peak due to Seiko Denshi Kogyo DSC22
Approximately 0.5m thick produced by hot pressing using 0C
Approximately 10 mg of a test piece cut from a sheet of m
The sample was placed in a sample pan for C measurement, preheated at 150 ° C. for 5 minutes, cooled to 40 ° C. at 10 ° C./min, held for 5 minutes, and then heated at a rate of 10 ° C./min for measurement.

The ethylene-α-olefin copolymer having such a characteristic that only one endothermic peak exists can be obtained, for example, by the method described in the specification of JP-A-2-77410. it can. That is, in a hydrocarbon solvent, (I) a transition metal component represented by the following general formula:

VO (OR) _n X _3-n (wherein R is a hydrocarbon group, X is a halogen, 0 <n <3)
A vanadium compound (hereinafter abbreviated as V),
And (II) an organometallic component represented by the following general formula

Embedded image R ′ _m A1X _3-m (wherein R ′ is a hydrocarbon group, X is a halogen, 1 <m <
The organoaluminum compound (hereinafter abbreviated as Al) represented by 3) and (III) a third component represented by the following general formula

Embedded image R ″ (C = 0) OR ′ ″ (wherein, R ″ is a hydrocarbon group having 1 to 20 carbon atoms, an organic group partially or wholly halogen-substituted, R ″ Is a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms using a catalyst system formed from an ester compound (hereinafter abbreviated as M) represented by a hydrocarbon group having 1 to 20 carbon atoms. In this case, the polymerization temperature is 40 to 8 under the catalyst condition that A1 / V (molar ratio) is 2.5 or more and M / V (molar ratio) is 1.5 or more.
It is obtained by copolymerization at 0 ° C. in the state where a hydrocarbon solvent-insoluble polymer (slurry part) and a hydrocarbon solvent-soluble polymer (solution part) coexist. Also, JP-A-60-226514
Can be obtained by similarly polymerizing a vanadium compound obtained by reacting vanadium trichloride and an alcohol described in the specification of the above with the above-mentioned (I) transition metal component. Furthermore, it can also be obtained by using a metallocene catalyst which has recently become a hot topic.

The ethylene used in the present invention is
α-olefin copolymer (ethylene content is 50 mol%
Above) As [B], the density is 0.910 to 0.935.
g / cm ³ . Density not observed improvements in anti-fogging property and slipperiness is less than 0.910 g / cm ^3, exceeds 0.935 g / cm ^3, not only the low-temperature heat adhesion is reduced, transparency of the resulting film Will also be inferior.

Further, the density of the ethylene-α-olefin copolymer [B] needs to be at least 0.008 g / cm ³ higher than the density of the ethylene-α-olefin copolymer [A]. When the difference between the density of the ethylene-α-olefin copolymer [B] and the density of the ethylene-α-olefin copolymer [A] is less than 0.008 g / cm ³ , the antifogging property and the slipping property are improved. Can not be seen.

[0014] mixing proportion of the present invention, ethylene -α- olefin copolymer [A] and ethylene -α- olefin copolymer [B] is a weight 9: 1 to 6: 4 range der
You . If the mixing ratio of the ethylene-α-olefin copolymer [B] does not reach this range, that is, if it is less than 10 wt%, the improvement in antifogging properties and slipperiness may be insufficient. If it exceeds 40%, that is, if it exceeds 40 wt%, the interlayer adhesion strength may be reduced and delamination may occur. Further, not only is the low-temperature heat adhesion lowered, but also the flexibility becomes poor, so that it may not be preferable for stretch packaging or stretch shrink packaging.

The α-olefin monomer constituting the ethylene-α-olefin copolymers [A] and [B] is preferably an α-olefin having 3 to 10 carbon atoms, for example, propylene, butene 1. Penten
1,4-ethylpentene, heptene, hexene-1, octene-1 and the like can be used.

The propylene polymer used in the present invention includes propylene homopolymer, propylene-ethylene copolymer (ethylene content is 20 mol% or less), propylene-butene-1 copolymer, propylene-butene-1
-An ethylene copolymer (the total content of butene-1 and ethylene is 20 mol% or less), or propylene and a carbon number of 5
The propylene-α-olefin copolymer using the above-mentioned α-olefin alone or in combination with α-olefin is also exemplified. Among these, a propylene-ethylene copolymer having an ethylene content of 2 to 12 mol% is preferred from the viewpoint of a balance between transparency and mechanical strength.

The antifogging agent used in the present invention is not particularly limited, and an antifogging agent conventionally added for imparting antifogging property to a packaging film can be used as it is. For example, diglycerin monolaurate, diglycerin monooleate, diglycerin sesquilaurate, diglycerin sesquiolate, monoglycerin monolaurate, polyglycerin fatty acid ester-based antifogging agents such as monoglycerin monooleate, polyethylene glycol monolau , Polyethylene glycol fatty acid ester-based antifogging agents such as polyethylene glycol monooleate, polyethylene glycol alkyl ether-based antifogging agents such as polyoxyethylene lauryl alcohol ether and polyoxyethylene lauryl alcohol ether, furthermore, stearyl alcohol, oleyl Alkyl alcohol-based antifoggants such as alcohols are preferably used. In addition, these antifogging agents can be used alone, or
Two or more types may be used in combination.

As described above, the film structure of the present invention is a laminated film having at least three layers, and both outer layers have at least the ethylene-α-olefin copolymer [A] and the ethylene-α-olefin copolymer. It is necessary that the core layer is composed of a mixture of the polymer [B] and the antifogging agent (C), and the core layer is a propylene polymer. However, it is possible to insert another resin layer as an intermediate layer between the outer layer and the core layer, or to separate the core layer into two layers, and in the meantime, recycle raw materials such as unqualified products generated during production of the product of the present invention. It is also possible to provide a recycled resin layer made of

In the film thickness composition of the present invention, each outer layer is 5 to 40% of the total thickness, and the core layer is 90 to 20% of the total thickness.
Is preferable from the viewpoint of the balance of various physical properties of the obtained film. The total thickness of the film is 10
５０50 μm is preferred for packaging.

The resin or the resin composition of each layer constituting the laminated film for packaging of the present invention can contain various resin modifiers as required. Further, additives such as an antioxidant, a lubricant, an anti-blocking agent, and a tackifier may be added.

As a method for producing the laminated film for packaging of the present invention, for example, a method of forming a film by a usual method such as an inflation method or a T-die method and then bonding the films, a method of forming two or three layers, Alternatively, a film forming method using a coextrusion blown film molding machine or a T-die film molding machine of three types and five layers is possible. Further, it can also be manufactured by laminating a film extruded by an extrusion lamination method on a formed film.

In order to impart heat shrinkage to the laminated film for packaging of the present invention, it is necessary to stretch uniaxially or biaxially after film formation. In the case of uniaxial stretching, for example, a commonly used roll stretching method is suitably used. In the case of biaxial stretching, a sequential biaxial stretching method in which stretching is performed in the transverse direction after stretching in the longitudinal direction by a tenter method, or a simultaneous biaxial stretching method in which stretching is performed in the longitudinal and transverse directions at the same time, is suitably used. In the case of biaxial stretching, a tubular stretching method is also suitably used. In the case of biaxial stretching, the stretching ratio is preferably 2 to 30 times, more preferably 3 to 25 times, in area magnification.

When the self-adhesiveness of the film is imparted to the film by a method such as adding a tackifier, the laminated film of the present invention is suitably used for stretch packaging of foods and the like. When the film is provided with self-adhesiveness and heat shrinkage at the same time, it is suitably used for stretch shrink packaging of foods and the like.

In particular, the laminated film for packaging of the present invention comprises:
Since it has good slipperiness with a tray made of expanded polystyrene or the like, it is excellent in automatic packaging suitability when used for stretch packaging or stretch shrink packaging of foods and the like placed on the tray. Moreover, water droplets do not adhere to the film surface of the package.

[0025]

The laminated film for packaging of the present invention has excellent anti-fog properties,
Moreover, it is not clear whether the sliding property with the tray or the like is improved, but the following may be considered. That is, it is presumed that by mixing the ethylene-α-olefin copolymer [B] with the ethylene-α-olefin copolymer [A], the saturation solubility of the antifogging agent [C] is reduced and bleeding is likely to occur. You. Moreover, when the difference between the density of the ethylene-α-olefin copolymer [A] and the density of the ethylene-α-olefin copolymer [B] is within a specific range, the bleeding of the anti-fogging agent [C] is reduced. It is considered to be good and to have good properties such as transparency and mechanical strength. Further, since the ethylene-α-olefin copolymer [A] and the ethylene-α-olefin copolymer [B] are not completely mixed, the ethylene-α-olefin copolymer [B] having high hardness is used. It seems that this phase acts as an anti-blocking agent and improves the slipperiness with a tray or the like.

[0026]

EXAMPLES Hereinafter, the content of the present invention will be described in more detail by way of examples.
There is no restriction by these embodiments.
First, a method for measuring physical properties and a packaging test method in the following Examples and Comparative Examples will be described. (1) Density Measured by a method specified in JIS K6760. The measurement was performed after annealing in water at 100 ° C. for 1 hour. (2) Tensile strength Measured according to the method specified in ASTM D882. (3) Young's modulus It was measured by a method specified in ASTM D882. (4) Haze Measured by the method specified in ASTM D1003. In addition, it shows that transparency is so favorable that this value is small. (5) Gloss was measured by a method specified in ASTM D523. In addition, it shows that glossiness is so favorable that this value is large.

(6) Anti-fogging property The anti-fogging property at room temperature is determined by measuring the degree of fogging on the film surface after placing warm water at 70 ° C. in a cup, covering the mouth of the cup with a sample film, and allowing it to stand at room temperature of 20 ° C. for 1 hour. Was evaluated. or,
The anti-fogging property at low temperature was evaluated by putting water at 23 ° C. into a cup, covering the mouth of the cup with a sample film, leaving the cup to stand at a room temperature of 5 ° C. for 1 hour, and evaluating the degree of fogging on the film surface. Furthermore, the antifogging property in freezing was evaluated by putting ice in a cup, covering the mouth of the cup with a sample film, leaving the cup in a freezer for 1 hour, and then returning the temperature to room temperature, and then evaluating the degree of fogging on the film surface. still,
As the evaluation, "◎" indicates a state without clouding at all, "○" indicates a state with slightly clouding (a degree that cannot be understood depending on the viewing angle),
The slightly cloudy state was indicated by “△”, and the cloudy state was indicated by “×”.

(7) Slipperiness The slipperiness between the sample film and the expanded polystyrene sheet was determined as follows.
The measurement was performed using a friction coefficient measuring device manufactured by Tester Sangyo Co., Ltd. The measured values were expressed as a coefficient of static friction (μs) and a coefficient of dynamic friction (μk). In addition, the measured value was set to 69.
Both 35 g and 249.35 g were measured, and the respective values were averaged. The sliding speed was 150 mm / min and the contact area was 600 mm ² (20 mm × 30 mm).

(8) Low Temperature Thermal Adhesion Tray stretch packaging machine manufactured by Omori Machinery Co., Ltd. (STC-
(IIIB type), automatic packaging was carried out under the following conditions, and the temperature at which the thermo-adhesive portion on the back surface of the tray had good adhesion strength was indicated. Film width: 300mm Tray dimensions: 190mm in length x 110mm in width
Height 26mm Package weight: 500g Packaging speed: 50 pieces / min Shoot belt: about 15m / min

(9) Packaging test (Stretch shrink packaging) Using a tray stretch packaging machine (STC-IIIB type) manufactured by Omori Machinery Co., Ltd., no freezing was performed on an expanded polystyrene tray (250 × 170 × 15 mm). Shrimp (150g), film width 4
Stretch packaging was performed with a 50 mm sample film.
Specifically, using the tray stretch packaging machine, first,
Both ends of the film are overlapped in the form of a palm seal and formed into a tubular shape by self-adhesion. Then, the film is cut at an appropriate distance from the front and rear ends of the tray inserted into the cylindrical body, and the cut end is folded back to the back surface of the tray along the front and rear ends of the tray. Furthermore, both ends of the film are pressed together on a hot plate with the portion where the two ends are overlapped in a palm-shape seal and the cut film end folded back on the back surface of the tray,
Heat contact with the film located on the back of the tray. The obtained stretch package was passed through a heat shrink tunnel set at 90 ° C. for 1 second to perform stretch shrink packaging.

[0031]

【Example】

[Example 1] Ethylene-α-olefin copolymer [A]
Is ethylene-butene- having a density of 0.895 g / cm ³ , a butene-1 content of 5.3 mol%, and one endothermic peak at 85 ° C. by differential thermal analysis (DSC).
1 copolymer, ethylene-α-olefin copolymer [B] having a density of 0.912 g / cm ³ , a hexene content of 4.5 mol%, and an endothermic peak by differential thermal analysis (DSC). Using an ethylene-hexene copolymer present at 82 ° C. and 119 ° C., these copolymers [A] and [B] were mixed in a weight ratio of 7: 3, and diglycerin oleate and polyethylene glycol oleate were added thereto. A resin composition in which an acid ester and a glycerin oleate were mixed at a weight ratio of 5: 3: 2 to add 2.00% by weight of an antifogging agent was used as both outer layers, and the ethylene content was 4.6% by weight. To obtain a tubular co-extruded laminated unstretched raw sheet having the propylene-ethylene copolymer as a core layer. For film formation, an extruder having a screw diameter of 65 mmφ (for both outer layers) and an extruder having a screw diameter of 40 mmφ (for a core layer), and an annular die for co-extrusion of two kinds and three layers having a diameter of 180 mmφ were used. By co-extrusion. or,
The thickness of the obtained tubular laminated unstretched raw sheet is about 1
The thickness ratio of each layer is about 20% for each outer layer,
With a core layer of 60%, the tube width was 300 mm. Furthermore, this tubular laminated unstretched raw sheet is stretched 3.3 times in the longitudinal direction and 3.1 times in the transverse direction by the tubular biaxial stretching method, and then heat-set while giving some relaxation. Thus, a packaging laminated film having an overall thickness of about 12 μm was obtained. Table 1 shows the properties of the obtained film.
In addition, the antifogging property and the sliding property of the obtained film were both good. Using the obtained laminated film for packaging, stretch shrink packaging of frozen headless shrimp placed on a polystyrene foam tray was performed. As a result, the laminated film for packaging of Example 1 had good sliding with the tray and was excellent in automatic packaging suitability. Moreover, when the obtained package was left at room temperature after freezing, no water droplets adhered to the film surface.

COMPARATIVE EXAMPLE 1 Both outer layers were composed of only the ethylene-butene-1 copolymer of the ethylene-α-olefin copolymer [A] used for both outer layers of Example 1, and ethylene-α-
A laminated film for packaging was obtained in the same manner as in Example 1, except that the olefin copolymer [B] was not used. Various properties of the obtained film are also shown in Table 1. In addition, the laminated film for packaging of Comparative Example 1 was inferior in both antifogging property and sliding property. Further, using the obtained laminated film for packaging, stretch shrink packaging of a frozen headless shrimp placed on an expanded polystyrene tray was performed in the same manner as in Example 1. As a result, the laminated film for packaging of Comparative Example 1 had poor slip with the tray and was inferior in automatic packaging suitability. Further, when the obtained package was left at room temperature after freezing, water droplets adhered to the film surface.

[Comparative Example 2] Instead of the ethylene-butene-1 copolymer used for both outer layers of Comparative Example 1, the both outer layers had a density of 0.895 g / cm ³ and a butene-1 content of 7%. .
0 mol%, endothermic peak by differential thermal analysis (DSC) is 1
Ethylene-butene-1 which exists in two at 05 ° C and 115 ° C
A laminated film for packaging was obtained in the same manner as in Comparative Example 1 except that the copolymer was used. Various properties of the obtained film are also shown in Table 1. The laminated film for packaging of Comparative Example 2 was not as good as Comparative Example 1, but was inferior in antifogging property and slipperiness.

Comparative Example 3 Instead of the ethylene-α-olefin copolymer [B] used for the outer layers in Example 1, the outer layer had a density of 0.905 g / cm ³ , hexene content 5.1 mol%
A laminated film for packaging was obtained in the same manner as in Example 1 except that the ethylene-hexene copolymer was used. Various properties of the obtained film are also shown in Table 1. In addition, the laminated film for packaging of Comparative Example 3 was inferior in antifogging property and slipperiness.

Comparative Example 4 The ethylene-hexene copolymer having a density of 0.905 g / cm ³ used in Comparative Example 3 was used as an ethylene-α-olefin copolymer [A] in both outer layers.
Except that the ethylene-hexene copolymer having a density of 0.912 g / cm ³ used in Example 1 was changed to an ethylene-α-olefin copolymer [B], a laminated film for packaging was produced in the same manner as in Example 1. I got The properties of the obtained film are described below. The packaging laminated film of Comparative Example 4 was
It was inferior in antifogging property and sliding property.

[0036]

[Table 1]

COMPARATIVE EXAMPLES 5 AND 6 In both outer layers, ethylene-butene of ethylene-α-olefin copolymer [A] and ethylene-α-olefin copolymer [B] used in both outer layers of Example 1 was used. -1 copolymer and ethylene-hexene copolymer in a mixing ratio of 9.5: 0.5 ( ratio
A laminated film for packaging was obtained in the same manner as in Example 1 except that the resin compositions mixed in Comparative Examples 5 ) and 5: 5 ( Comparative Example 6 ) were used. Table 2 shows the properties of the obtained film. The packaging laminate film of Comparative Example 5 was found to have improved antifogging properties and slipperiness as compared with the packaging laminate film of Comparative Example 1, but was inferior to the packaging laminate film of Example 1. I was However, it was sufficiently practical. Moreover, the laminated film for packaging of Comparative Example 6 was somewhat inferior in low-temperature adhesion and flexibility in some applications.

COMPARATIVE EXAMPLE 7 Instead of the ethylene-butene-1 copolymer of the ethylene-α-olefin copolymer (A) used for both outer layers of Example 1, the both outer layers of Comparative Example 2 were used. A laminated film for packaging was obtained in the same manner as in Example 1, except that the ethylene-butene-1 copolymer having two endothermic peaks used for the outer layer was used. Table 2 shows the properties of the obtained film. Although the packaging laminated film of Comparative Example 1 was inferior in antifogging property and slipperiness to the packaging laminated film of Comparative Example 2, the packaging laminated film of Comparative Example 7 was the same as that of Example 1. It had almost the same antifogging property and slipperiness as the laminated film for packaging. However, the low-temperature adhesion was insufficient.

[0039]

[Table 2]

[0040]

Since the laminated film for packaging of the present invention has good slipperiness, it has good suitability for automatic packaging. In particular,
Since the slipperiness with the tray is good, the suitability for automatic packaging of stretch packaging or stretch shrink packaging of food or the like placed on the tray is good. Furthermore, the package using the laminated film for packaging of the present invention, when the laminated film for packaging of the present invention is excellent in antifogging properties, when stored at low temperature or when left at room temperature after being frozen and stored, etc. Furthermore, water droplets do not adhere to the film surface of the package, and the appearance as a product is good.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Yamada 2-10-1 Tsukahara, Takatsuki City, Osaka Prefecture Inside Sumitomo Chemical Co., Ltd. (72) Inventor Kazuo Kondo 1515 Nakatsucho, Marugame-shi, Kagawa Okura Industry Co., Ltd. (72) Inventor Teruo Tada 1515 Nakatsu-cho, Marugame City, Kagawa Prefecture Okura Industry Co., Ltd. (72) Inventor Toyoshi Wano 1515 Nakatsu-cho, Marugame City, Kagawa Prefecture Okura Industry Co., Ltd. 1515 Nakatsu-cho, Marugame City, Kagawa Prefecture Inside Okura Industry Co., Ltd. (56) References JP-A-6-115026 (JP, A) JP-A-6-155685 (JP, A) JP-A-6-87197 (JP, A) JP-A-6-87198 (JP, A) JP-A-3-215034 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 EPAT (QUESTEL) ) WPI L (QUESTEL)

Claims (5)

(57) [Claims] 1. A laminated film comprising at least three layers, wherein both outer layers have a density of 0.870 to 0.910 g / cm.
³ , an ethylene-α-olefin copolymer having a melting point at which only one endothermic peak exists by differential thermal analysis (DSC) (ethylene content is 50 mol% or more)
[A] and an ethylene-α-olefin copolymer having a density of 0.910 to 0.935 g / cm ³ (ethylene content of 5
0% by mole or more) [B] and an anti-fogging agent [C], and the density of the ethylene-α-olefin copolymer [B] is lower than that of the ethylene-α-olefin copolymer [A]. 0.008 g / cm ³ or more and the density
0.870 to 0.910 g / cm ³ of ethylene-α-O
A refin copolymer [A] and a density of 0.910 to 0.9.
35 g / cm ³ ethylene-α-olefin copolymer
A laminated film for packaging, wherein the weight ratio of [B] is from 9: 1 to 6: 4, and the core layer is made of a propylene-based polymer. 2. The laminated film for packaging according to claim 1, wherein the propylene-based polymer is a propylene-ethylene copolymer having an ethylene content of 2 to 12 mol%. 3. The packaging laminated film according to claim 1, wherein the laminated film has heat shrinkability. 4. The laminated film for packaging according to claim 1, wherein the packaging is for stretch packaging. 5. The laminated film for packaging according to claim 1, wherein the packaging is for tray packaging.