JPH1080983A - Laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make openability, heat sealability, transparency, and slidability improve by using a polyolefin of a specified composition for a heat seal layer. SOLUTION: A layer of a polyolefin in which an elution component measured by a temperature increase elution fractionation method of 20 deg.C or less elution temperature is 50-85wt.%, an elution component of above 20-below 70 deg.C is 5-30wt.%, an elution component of above 20-below 70 deg.C is 10-40wt.%, and component of 10,000 or less molecular weight is 5wt.% or less is laminated on one side of a backing film. When the elution component of 20 deg.C or less elution temperature is less than 50wt.%, the openability of the obtained laminated film is deteriorated, and when it is more than 85wt.%, the openability and the slidability are deteriorated. When the elution component of above 20-below 70 deg.C is 5wt.% or less, the transparency is deteriorated, and when it is more than 30wt.%, the openability and the slidability is deteriorated. When the elution component of 70 deg.C or more is less than 10wt.%, the openability and the slidability is deteriorated, and when it is more than 40wt.%, then openability and the transparency is deteriorated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film, and more particularly, to the peeling of a heat-sealed surface when a bag is made (hereinafter referred to as a "laminated")
(Referred to as openability). More particularly, the present invention relates to a laminated heat seal film having good openability, which is made of biaxially stretched polypropylene as a base material.

[0002]

2. Description of the Related Art When packaging an article with a film, the film is heat-sealed. that time,
It is known to use a film in which a heat seal layer made of a polyolefin-based thermoplastic resin such as polypropylene or polyethylene is laminated on the surface of a base resin layer.

[0003] By the way, in such packaging by heat sealing, it is indispensable that the joint portion between the heat-sealed films has sufficient strength so as not to be broken during distribution. Conflicting performance that can be opened at any time is required.

[0004] Further, when the package is opened, it is required that the joint can be opened cleanly. That is, in a laminated film having a heat seal layer made of the polyolefin-based thermoplastic resin, usually, when the bonding portion is to be peeled, stringing and fuzzing are likely to occur,
Smooth peeling does not occur at the welding interface between the films or inside the heat seal layer, and the base layer is torn during the opening of the bonding part without separating the bonding part into the original films again. Such a phenomenon leads to poor appearance of the article at the time of opening and lowers the commercial value of the article. In addition, there is a danger that the torn portion becomes a starting point, the film is severely broken during opening, and the contents fall.

[0005]

Accordingly, it has been desired to solve the above-mentioned drawbacks and to develop a heat seal film having excellent opening properties, heat seal properties, transparency and slipperiness.

[0006]

Means for Solving the Problems The present inventors have intensively studied to solve the above problems. As a result, it has been found that the above problems can be solved by using a polyolefin resin layer of a specific component for the heat seal layer, and the present invention has been completed.

That is, according to the present invention, an elution temperature of at least one surface of a substrate film is determined by a temperature-increasing elution fractionation method.
50 to 85% by weight of eluted components at 0 ° C. or less, 5 to 30% by weight of eluted components at more than 20 ° C. and less than 70 ° C., 10 to 40% by weight of eluted components at 70 ° C. or more, and a molecular weight of 10,000 or less. It is a laminated film in which a polyolefin resin layer in which the weight percentage of the components is 5% or less is laminated.

In the present invention, the polyolefin resin component forming the polyolefin resin layer is eluted at a specific elution temperature at each elution temperature in the measurement by the temperature rise elution fractionation method. As the polyolefin resin component forming such a polyolefin resin layer, a polyolefin that satisfies the above elution requirement may be used alone, but it is generally used by adjusting a mixture of a plurality of polyolefins to satisfy the elution requirement. It is.

The polyolefin resin to be used is not particularly limited, but ethylene and propylene,
1-butene, 1-pentene, 1-hexene, 1-heptene, 4-methyl-1-pentene and other random copolymers with one or more α-olefins having 3 to 12 carbon atoms, preferably 3 to 8 carbon atoms. Or a block copolymer, and α having 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, such as propylene and ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 4-methyl-1-pentene and the like. -A random copolymer with one or more olefins, or a block copolymer.

[0010] Among these polyolefin resins, examples of the resin containing an elution component having an elution temperature of 20 ° C or lower to a certain extent or more include, for example, a monomer unit content of 40 to 90 mol% based on ethylene and a monomer unit based on propylene. An ethylene-propylene random copolymer having a content of body units of 10 to 60 mol%, a content of monomer units based on propylene of 40 to 70 mol%, and a content of monomer units based on butene of 30
And a propylene-butene random copolymer having a concentration of about 60 mol%. These have a weight average molecular weight of 3 to 3 in consideration of openability, heat seal strength, and extrudability.
It is good to be in the range of 350,000, preferably 50,000 to 300,000.

On the other hand, resins containing more than 20 ° C. and less than 70 ° C. and more than 70 ° C. more or less include, for example, ethylene and propylene, 1-butene, and 1-butene.
-Pentene, 1-hexene, 1-heptene, 4-methyl-1-pentene and the like having 3 to 12 carbon atoms, preferably 3 to 8 carbon atoms.
Α-olefin homopolymer having a content of monomer units based on ethylene of 80 to 99 mol% and α-olefins other than ethylene
An ethylene-α-olefin random copolymer in which the monomer unit based on olefin is 1 to 20 mol%, the content of the monomer unit based on propylene is 80 to 99 mol%, and the unit based on α-olefin other than propylene is Propylene-α-olefin random copolymers having a monomer unit content of 1 to 20 mol% are exemplified. In consideration of transparency and openability, these have a weight average molecular weight of preferably 50,000 to 500,000, preferably 100,000 to 350,000.

In the present invention, the resins may be mixed and used so as to satisfy the above-mentioned elution requirements in consideration of the amounts of the elution components of the resins at the respective elution temperatures.

Here, it is particularly preferable that the elution temperature of the polyolefin resin component at an elution temperature of 20 ° C. or less is 60% by weight to 80% by weight. When the elution component having an elution temperature of 20 ° C. or lower is less than 50% by weight, the resulting laminated film is not preferable because the opening property of the laminated film is reduced. Elution temperature 2
If the elution component at 0 ° C. or lower is more than 85% by weight, the resulting laminated film is not preferable because the openability and slipperiness of the laminated film are reduced. In addition, the elution temperature of the polyolefin resin component exceeding 20 ° C. and less than 70 ° C.
Preferably it is 25% by weight. If the elution temperature is higher than 20 ° C. and lower than 70 ° C. and less than 5% by weight, transparency is undesirably reduced. If the amount of this component is more than 30% by weight, the resulting laminated film is unfavorably open and slippery. Furthermore, the elution component of the polyolefin resin component having an elution temperature of 70 ° C. or more is particularly preferably 15% by weight to 30% by weight. Elution temperature 70 ° C
If the amount of the above-mentioned eluted components is less than 10% by weight, it is not preferable because the opening property and slipperiness of the obtained laminated film are reduced. When this component amount is more than 40% by weight,
It is not preferable because the opening property and the transparency of the obtained laminated film are reduced.

In the present invention, the polyolefin resin component must have a weight percentage of a component having a molecular weight of 10,000 or less of 5% or less, preferably 4% or less. Thereby, the obtained laminated film becomes extremely excellent in slipperiness.

The melt flow rate (hereinafter abbreviated as MFR) of the polyolefin resin component is 0.1 to 50 g / 10 min, preferably 0.5 to 30 g in consideration of film forming properties.
g / 10 minutes is preferred.

In the present invention, among the specific resin compositions used as the above-mentioned polyolefin resin component, a laminated film excellent in film-forming properties, low-temperature sealing properties, and slipperiness can be obtained, and the most suitable one can be used. , A) the content of monomer units based on ethylene is 70 to 90 mol%, and the monomer units based on α-olefins other than ethylene are 10%;
100% by weight of an ethylene-α-olefin random copolymer in which the weight percentage of components having a molecular weight of 10,000 or less is 3% or less. B) The content of monomer units based on propylene is 80 to 99%.
Mol%, the content of monomer units based on α-olefins other than propylene is 1 to 20 mol%, and the weight percentage of components having a molecular weight of 10,000 or less is 7% or less.
Examples of the olefin random copolymer include 10 to 100 parts by weight.

The above ethylene-α-olefin random copolymer has a monomer unit content of 70 to 9 based on ethylene.
It contains 0 mol%, preferably 73 to 87 mol%, 10 to 30 mol%, preferably 13 to 27 mol% of monomer units based on α-olefins other than ethylene, and has a molecular weight of 1
The weight percentage of the components of 10,000 or less is 3% or less, preferably 2%.
Below, more preferably 10,000 or less. When the content of the monomer unit based on ethylene is less than 70 mol%, the slipperiness of the obtained laminated film tends to decrease. When the ethylene content is more than 90 mol%, the low-temperature heat sealability and the opening property of the obtained laminated film tend to decrease. On the other hand, when the weight percentage of the component having a molecular weight of 10,000 or less is more than 3%, it is difficult to suppress the component amount of the entire resin component to the above-specified amount, and the slipperiness tends to decrease.

Other α-olefins include propylene, 1-butene, pentene, methylbutene, hexene,
Those having 3 to 12, preferably 3 to 8, carbon atoms such as methylpentene and octene are good. Melt flow rate (hereinafter abbreviated as MFR) is 0.1
５０50 g / 10 min, preferably 0.5-30 g / 10 min.

In the present invention, such ethylene-α-
As the olefin random copolymer, one having a weight percentage of 3% or less of components having a molecular weight of 10,000 or less is appropriately selected from known ones having the above composition, from the relationship between the weight average molecular weight and the breadth of the molecular weight distribution. Can be used. Further, a polymer obtained by decomposing a polymerized random copolymer using a known compound such as an organic peroxide may be used.

On the other hand, the propylene-α-olefin random copolymer contains 8 units of propylene-based monomer units.
0-99 mol%, preferably 90-98 mol%, other α
-Containing 1 to 20 mol%, preferably 2 to 10 mol%, of monomer units based on olefins, and having a molecular weight of 10,000 or less, wherein the weight percentage is 7% or less, preferably 6% or less, more preferably 5% or less; These are: When the monomer unit based on propylene is less than 80 mol%, the opening property of the obtained laminated film tends to decrease. This value is 99
When it is more than mol%, transparency tends to decrease.
On the other hand, when the weight percentage of the component having a molecular weight of 10,000 or less is more than 7%, it is difficult to suppress the component amount of the entire resin component to the above-specified amount, and the slipperiness tends to decrease.

Other α-olefins include ethylene,
Those having 2 and 4 to 12, preferably 2 and 4 to 8 carbon atoms, such as 1-butene, pentene, methylbutene, hexene, methylpentene and octene, are good. The melt flow rate (hereinafter abbreviated as MFR) is 0.1 to 50 g / 10 minutes, preferably 0.5 to 30 in consideration of film forming properties.
g / 10 minutes is preferred. In addition, differential scanning calorimetry (DS
The main peak in C) is 120 to 150 ° C., and preferably 125 to 150 ° C. in consideration of low-temperature heat sealability and slipperiness.
It is good to be in the range of 145 ° C.

In the present invention, such propylene-α
-The olefin random copolymer is appropriately selected from known ones having the above-mentioned composition, and those having a weight percentage of components having a molecular weight of 10,000 or less of 7% or less from the relationship between the weight average molecular weight and the breadth of the molecular weight distribution. Can be used. Further, a polymer obtained by decomposing a polymerized random copolymer using a known compound such as an organic peroxide may be used.

In the present invention, the ethylene-α-olefin random copolymer and the propylene-α-olefin random copolymer are propylene-α-olefin random copolymer with respect to 100 parts by weight of the ethylene-α-olefin random copolymer.
10 to 100 parts by weight, preferably 15 to 80 parts by weight, more preferably 15 to 6 parts by weight of the olefin random copolymer
It is preferable to mix 5 parts by weight. Thereby, the obtained polyolefin resin component is usually adjusted so as to satisfy the elution requirement. Here, when the blending amount of the propylene-α-olefin random copolymer is less than 10 parts by weight, the amount of the eluting component at 70 ° C. or higher by the temperature rising elution fractionation method of the polyolefin resin component is too small,
The openability of the obtained laminated film is likely to be reduced. On the other hand, when the blending amount of the propylene-α-olefin random copolymer is more than 100 parts by weight, the amount of the polyolefin resin component eluted by the temperature-rise elution fractionation method becomes too large, and the slip property of the obtained laminated film, Openability,
Transparency, especially the opening property when the surface layer is stretched, tends to decrease.

The mixing of the ethylene-α-olefin random copolymer and the propylene-α-olefin random copolymer may be carried out by any method, but usually, the pellets of each copolymer are mixed with a mixer. After mixing the powders and / or pellets of the respective copolymers in a heated and molten state, it is preferable to carry out the mixing with an extrusion kneader.

Next, in the laminated film of the present invention, the base film on which the above-mentioned polyolefin resin layer is laminated on at least one surface may be any resin film. Then, the main peak in DSC is 120 to 250 ° C., more preferably 1 to 250 ° C.
It is preferred to be made of a resin at 30 to 170 ° C. Specific examples include homopolymers or copolymers of olefins such as ethylene, propylene, butene, and methylpentene. Of these, polypropylene is particularly preferred. These resins that can be used as the base material layer may be used alone or in combination of two or more.

As the polypropylene used for the base film, a homopolymer of propylene, 90 mol% or more of propylene and another α-olefin, for example, ethylene, 1-
Butene, 1-pentene, 1-hexene, 1-heptene,
A random copolymer or block copolymer with one or more of 10 mol% or less such as 4-methyl-1-pentene can be generally used. The MFR is preferably in the range of 0.5 to 20 g / 10 minutes in consideration of film forming properties. In the present invention, the base material film may be a multilayer film, for example, a multilayer film in which a collecting resin layer, a gas barrier layer such as silica vapor deposition, or the like is laminated on these polypropylene films as an intermediate layer. .

In the present invention, an antistatic agent, an antifogging agent, an antiblocking agent, an antioxidant, a light stabilizer, a crystal nucleating agent, a lubricant, Known additives such as a surfactant for imparting lubrication and anti-blocking properties may be blended and used.

In the present invention, the thickness of the laminated film is not particularly limited.
m and preferably 15 to 120 μm. The thickness of the polyolefin resin layer, which is the surface layer, is generally appropriately selected from the range of 0.1 to 10 μm.

The method of forming a laminated film is not particularly limited, and it may be manufactured by any method. In general, a powder or pellet of a polyolefin resin component constituting a surface layer is co-extruded with a resin component of a base film, quenched on a temperature-controlled chill roll and formed into a non-stretched film, and then further monoaxially or biaxially. To stretch or
Alternatively, a method in which one layer of resin is melt-extruded and uniaxially stretched, and another layer of resin is melt-extruded thereon and stretched in a direction substantially perpendicular to the direction of uniaxial stretching or the like is employed. As an example of longitudinal uniaxial stretching, generally pass the film between the low-speed roll at the forefront and the high-speed roll at the rear,
Stretching is performed according to the rotation speed ratio of both rolls. On the other hand, the transverse uniaxial stretching is preferably performed by a tenter method.
In addition, longitudinal and horizontal sequential biaxial stretching, simultaneous biaxial stretching, and the like can be performed by the methods described above. The stretching ratio is 5 to 60 in area ratio.
Double, more preferably 30 to 50 times.

Although the above is the case of the flat shape, it is also possible to stretch the tubular material uniaxially, uniaxially and biaxially simultaneously by an inflation method. In this case, the raw material is heated to, for example, 80 to 150 ° C., and pressurized air is sent into the tubular film to form a film without stretching, or stretch uniaxially in the longitudinal or transverse direction, or simultaneously stretch in the longitudinal or transverse direction. What is necessary is just to carry out axial stretching.

In these molding methods, considering the transparency and elastic modulus (rigidity of the film) of the laminated film, 2
Axial stretching is preferred.

[0032]

Industrial Applicability The laminated film of the present invention is particularly suitable for a heat-sealing film, and is not only heat-sealed to form a structure having excellent sealing reliability, but also has an opening property, a low-temperature heat-sealing property, and a slip property. Provide excellent heat seal film. In particular, when peeling off the fused joint,
Both films are separated at the interface and the surface layer portion, and it is suppressed that either one of the base layer films is torn and separated. Therefore, when using a biaxially stretched easily torn substrate film, the present invention,
Especially effective.

Further, in this laminated film, the laminated film comprising the polyolefin resin component has good transparency. Therefore, when a material having good transparency such as polypropylene is used as a material resin of the base film, A film having excellent transparency can be obtained.

[0034]

EXAMPLES The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

In Examples and Comparative Examples, the polyolefin resins used as the base layer film and laminated film raw materials are shown in Tables 1 and 2.

[0036]

[Table 1]

[0037]

[Table 2]

The measuring methods used in the following Examples and Comparative Examples were implemented by the following methods.

(1) Weight average molecular weight (Mw), molecular weight 1
Component amount of 10,000 or less Measured by GPC (gel permeation chromatography) method. SSC-7100 manufactured by Senshu Science Co., Ltd.
GPC apparatus uses O-dichlorobenzene as a solvent and
Performed at 45 ° C. The column is Showa Denko UT-807,
Two UT-806M and four UT-802.5 were connected in series and used. A calibration curve was prepared using standard polystyrene, and the weight average molecular weight and the amount of components (weight percentage) having a molecular weight of 10,000 or less in terms of polystyrene were measured.

(2) Copolymer Composition Using a JNM-GSX-270 apparatus manufactured by JEOL Ltd.,
Ortho-dichlorobenzene / heavy benzene (volume ratio 90/1
Calculated from ¹³ C-NMR spectrum measured at 120 ° C. using 0) as a solvent.

(3) Melt flow rate (MFR) Measured according to JIS K7210.

(4) Measurement of elution temperature by temperature rise elution fractionation (TREF) Automatic TREF device SSC-730 manufactured by Senshu-Kagaku Co., Ltd.
The measurement was performed under the following conditions using 0ATREF.

Solvent: ortho-dichlorobenzene Flow rate: 150 ml / hour Heating rate: 4 ° C./hour Detector: Infrared detector Measurement wave number: 3.41 μm Column: “Packed column 30” manufactured by Senshu-Chemical
φ ”30 mm φ × 300 mm Concentration: 1 g / 120 ml Injection amount: 100 ml In this case, the sample solution in the column is introduced at 145 ° C., and then cooled to 10 ° C. at a rate of 2 ° C./hour, and the sample polymer is filled. After being adsorbed on the surface, the column temperature is raised under the above conditions, so that the polymer eluted at each temperature is obtained.
The concentration was measured with an infrared detector.

(5) Measurement of main peak by DSC After weighing about 5 to 6 mg of a sample, the sample was sealed in an aluminum pan, and the temperature was changed from room temperature to 235 ° C. or 270 ° C. in a nitrogen flow of 20 ml / min by a differential calorimeter. Raise the temperature and at these temperatures
Hold for 0 minutes, then cool to room temperature at 10 ° C / min. Thereafter, the temperature of the main peak was measured by a melting curve obtained at a heating rate of 10 ° C./min.

(6) Transparency The haze value of the film was measured according to JIS-K6714.

(7) Low-temperature heat-sealing property (heat-sealing starting temperature)
Using a heat seal bar, set each temperature (from 80 ° C to 1
(Measured every 5 ° C up to 55 ° C)
A sample having a width of 15 mm was cut out from a sample sealed under the conditions of kg / cm 2 and a heat sealing time of 1.0 second, and measured at a tensile speed of 500 mm / min using a tensile tester.
The results were average values of five samples. From the heat seal curve obtained by the above method, the heat seal strength was 300 g /
The temperature of 15 mm was set as the heat sealing start temperature.

(8) Slipperiness After film formation, ASTM-D after curing at 40 ° C. for 2 days
It measured according to the dynamic friction coefficient measuring method of -1894.

(9) Opening property Heat seal starting temperature and further 5 ° C. and 10 ° C.
For samples heat-sealed at high temperatures, 10
Each sample was measured using a tensile tester. Of the 30 samples in total, the number of the samples in which the bonding portion did not peel off at the interface or the surface layer portion of both films and the base film of one of the films was torn and separated was determined. The criteria are as follows.

Since the opening property depends on the pulling speed, it was measured at 500 mm / min and 1000 mm / min.

[0050]

[Table 3]

Examples 1 to 6 Using a resin shown in A in Table 1 as a base film, a T-die extruder was used to extrude a sheet under heat and melting at 280 ° C.
After being cooled and solidified on a chill roll, it was stretched 4.5 times with a heated roll stretching machine to obtain a uniaxially stretched sheet. Then
The resins shown in Tables 1 and 2 were blended with a mixer, extruded into a sheet while being heated and melted at 280 ° C. using a T-die extruder, and bonded to the uniaxially stretched sheet and a roll to obtain a two-layer sheet. The film was stretched 9 times with a transverse stretching machine. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4. In addition, 0.5 parts by weight of spherical polymethyl methacrylate particles having an average particle diameter of 4 microns and 0.5 parts by weight of erucamide were added to 100 parts by weight of the raw material resin constituting the surface layer.

Example 7 A laminated film was obtained in exactly the same manner as in Example 1 except that the resin shown in B in Table 1 was used for a base film. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4.

Example 8 The resin shown in A in Table 1 was used for a base film, and the resin and the resin for the surface layer shown in Tables 1 and 2 were heated and melted at 260 ° C. using a two-layer T-die extruder. Lower co-extrusion, tenter method 2
A laminated film stretched 4 times vertically and 8 times horizontally was obtained by an axial stretching machine. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4. The raw resin constituting the surface layer includes the raw resin 1
0.5 parts by weight of spherical polymethyl methacrylate particles having an average particle size of 4 microns and 0.5 parts by weight of erucamide were added to 00 parts by weight.

Example 9 The resin shown in A in Table 1 was used for a base film, and the resin and the resin for the surface layer shown in Tables 1 and 2 were heated and melted at 260 ° C. using a two-layer T-die extruder. It was co-extruded below and solidified by cooling on a chill roll to obtain a non-stretched two-layer film. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4. Incidentally, 0.7 parts by weight of spherical polymethyl methacrylate particles having an average particle size of 4 microns and 0.5 parts by weight of erucamide were added to 100 parts by weight of the raw material resin constituting the surface layer.

Examples 10 and 11 A laminated film was obtained in exactly the same manner as in Example 1 except that the resins shown in Tables 1 and 2 were used as the resin for the surface layer. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4.

Comparative Examples 1 to 7 Films were obtained in the same manner as in Example 1, except that the resins shown in Tables 1 and 2 were used as the base film and the resin for the surface layer. The thickness, haze, heat sealability, openability, and slipperiness of the obtained film were measured, and the results are shown in Table 4. In addition, 0.5 parts by weight of spherical polymethyl methacrylate particles having an average particle diameter of 4 microns and 0.5 parts by weight of erucamide were added to 100 parts by weight of the raw material resin constituting the surface layer.

The thickness, haze, heat sealability, openability and slipperiness of the obtained film were measured, and the results are shown in Table 4.

[0058]

[Table 4]

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Claims (2)

[Claims] (1) at least one side of a base film,
50-85% by weight of eluted components having an elution temperature of 20 ° C. or less, 5-30% by weight of eluted components exceeding 20 ° C. and less than 70 ° C., and
A laminated film in which a polyolefin resin layer having 40% by weight and a weight percentage of a component having a molecular weight of 10,000 or less of 5% or less is laminated. 2. A polyolefin resin layer comprising: a) 70 to 90 mol% of a monomer unit based on ethylene, and 10 to 30 monomer units based on an α-olefin other than ethylene.
Mol%, and the weight percentage of the component having a molecular weight of 10,000 or less is 3%.
100% by weight of an ethylene-α-olefin random copolymer having a content of not more than 80% by weight.
Mol%, the content of monomer units based on α-olefins other than propylene is 1 to 20 mol%, and the weight percentage of components having a molecular weight of 10,000 or less is 7% or less.
The laminated film according to claim 1, comprising 10 to 100 parts by weight of the olefin random copolymer.