JP2001040116A - Polyolefinic stretch film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyolefinic stretch film having large elongation, horizontal cut property, close adhesion, and finger pressure restoration, required during wrapping with a wrapping machine, having a balanced vertical (TD) and horizontal (MD) stress when elongated and capable of wrapping without surface wrinkle, and excellent in productivity, and its manufacturing method. SOLUTION: This polyolefinic stretch film is a film of a resin compsn. comprising as a base resin, a polyolefin resin comprising a single or a mixed resin of a copolymer of ethylene and (meth)acrylic ester and a terpolymer of ethylene, (meth)acrylic acid, and (meth)acrylic ester, and compounded, if necessary, with an anti-clouding agent and a tackifier, and has a stress in 100% elongation of 12-300 MPa in vertical direction (MD) and that of 5-11 MPa in horizontal direction (TD).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretch film for wrapping food and other articles and a method for producing the same.

[0002]

2. Description of the Related Art Polyvinyl chloride has been mainly used as a so-called stretch packaging film in which foods such as fruits and vegetables, fresh fish, meat, prepared foods, etc. are placed directly or on a lightweight tray such as plastic and the film is stretched and prepackaged. However, in recent years, polyolefin resins such as polyethylene, ethylene / butene-1 copolymer, and ethylene / vinyl acetate copolymer have been used due to environmental problems and safety and health problems.

However, films made of polyethylene or ethylene / butene-1 copolymer are relatively hard and difficult to stretch, and the ethylene / vinyl acetate copolymer has a problem that the film is easily broken after being packaged. Therefore, a stretch packaging film in which an ethylene / vinyl acetate copolymer resin layer is laminated on both sides of a butene-1 resin layer has been proposed (Japanese Patent Application Laid-Open No. 61-89040).
This eliminates the problem of being hard and difficult to stretch, but has the problem that the packaging suitability for an automatic packaging machine is narrow, and also has the disadvantage that loosening is likely to occur when a package is loaded. .

In order to improve this point, ethylene / (meth) acrylic acid copolymer resin is added to ethylene / (meth) acrylic acid copolymer resin.
A film made of a resin mixed with a (meth) acrylate copolymer resin has been proposed (JP-A-6-322).
192), a film which is not always satisfactory in stress at the time of elongation or the like has not been obtained, and a film which is more excellent in suitability for an automatic packaging machine has been demanded. Further, since this film is obtained by an inflation film molding method, there is a problem that productivity is poor.

[0005]

DISCLOSURE OF THE INVENTION The present invention has a large elongation, a lateral cut property, an adhesive property, a finger pressure restoring property, and the like necessary for packaging with an automatic packaging machine. Vertical /
An object of the present invention is to provide a polyolefin-based stretch film that is balanced in the lateral direction (MD / TD), can be packaged without surface wrinkles, and has excellent productivity, and a method for producing the same.

[0006]

Means for Solving the Problems As a result of intensive studies on the above background, the present inventors have found that ethylene / (meth) acrylic acid copolymer and ethylene / (meth) acrylate are used as polyolefin-based base resins. Using acrylic acid / (meth) acrylic acid ester terpolymer, it was found that a film obtained by T-die extrusion molding with excellent productivity and showing a specific stress at elongation was excellent in suitability for automatic packaging machine. The invention has been completed.

The polyolefin-based stretch film according to the present invention comprises a homopolymer of ethylene / (meth) acrylic acid copolymer or ethylene / (meth) acrylic acid / (meth) acrylate terpolymer, or a mixture thereof. A film composed of a resin composition containing a polyolefin resin composed of a resin as a base resin and, if necessary, an antifogging agent and a tackifier, wherein
The stress at the time of 100% elongation is 12 to 30 MPa, and the stress at the time of 100% elongation in the transverse direction (TD) is 5 to 11 MPa.
It is characterized by being.

In a preferred embodiment of the present invention, a tackifier is used in an amount of 0.1 part by weight based on 100 parts by weight of the polyolefin resin.
It is a polyolefin-based stretch film comprising a resin composition containing 5 to 12 parts by weight and an antifogging agent in a ratio of 1 to 5 parts by weight.

In the present invention, an ethylene / (meth) acrylic acid copolymer containing 3 to 20 mol% of a (meth) acrylic acid component is used.
(Meth) acrylate terpolymer, (meth)
It is preferable to use one containing 3 to 20 mol% of an acrylic acid component and 0.3 to 20 mol% of a (meth) acrylate component.

In the present invention, it is preferable to use a polyolefin resin having a (meth) acrylic acid component content of 7% by weight or less.

The polyolefin resin is preferably a resin containing not less than 60% by weight of an ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer, and more preferably, substantially ethylene / (meth) acrylate. The resin is preferably a resin composed of an acrylic acid / (meth) acrylic ester terpolymer.

In the preferred polyolefin stretch film of the present invention, the ratio (MD / TD) of the stress at 100% elongation in the machine direction (MD) to the stress at 100% elongation in the transverse direction (TD) is as follows: 1.5 to 3.0.

Further, a preferred polyolefin-based stretch film of the present invention comprises a film obtained by T-die extrusion of the resin composition. Furthermore, it is a film obtained by T-die extrusion molding of the resin composition, which is a film that has been subjected to an orientation prevention treatment.

The method for producing a polyolefin-based stretch film according to the present invention is a method for producing an ethylene / (meth) acrylic acid copolymer or an ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer alone or In forming a film by T-die extrusion molding of a resin composition containing a polyolefin-based resin composed of those mixed resins as a base resin and, if necessary, an antifogging agent and a tackifier, during or after film formation It comprises an orientation prevention treatment.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a polyolefin-based stretch film according to the present invention will be described in detail with respect to a polyolefin-based resin composition forming the film, a production method, and the obtained stretch film.

The resin composition used in the film forming of the present invention may be an ethylene / (meth) acrylic acid copolymer or an ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer alone or A polyolefin-based resin composed of such a mixed resin is used as a base resin, and a resin composition containing an antifogging agent and a tackifier as required.

The ethylene / (meth) acrylic acid copolymer is
Ethylene and methacrylic acid, or ethylene and acrylic acid are copolymerized by a known radical polymerization method or the like, and a structural unit component derived from (meth) acrylic acid in a polymer molecule (hereinafter, simply referred to as “component”). ) Is 3 ~
Those having 20 mol% are preferred. If the ratio of the (meth) acrylic acid component is too low beyond the above range, the flexibility of the resulting film, a tendency to lack the acupressure recovery is seen, and if too high above the range, the film will be too high. May be insufficient in lateral cut properties.

Melt flow rate of ethylene / (meth) acrylic acid copolymer (according to ASTM D1238, 190
C) is usually 0.5 to 30 g / 10 min.

The terpolymer of ethylene / (meth) acrylic acid / (meth) acrylate is ethylene / methacrylic acid / (meth) acrylate or ethylene / acrylic acid / (meth) acrylate. Are copolymerized by a known radical polymerization method or the like.

Here, the (meth) acrylate means an acrylate or methacrylate in which the alcohol residue is a hydrocarbon having 1 to 8 carbon atoms, such as methyl acrylate, ethyl acrylate, and isobutyl acrylate. , N-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, isobutyl methacrylate and the like. Of these, acrylates or methacrylates in which the alcohol residue is a hydrocarbon having 4 to 6 carbon atoms are particularly preferred.

The preferred ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer includes 3-20 mol%, preferably 5-5 mol%, of a component derived from (meth) acrylic acid in the polymer molecule. 15 to 20 mol%, preferably 0.3 to 20 mol%, more preferably 0.7 to 15 mol%, more preferably 1.0 to 1 mol%, of a component derived from a (meth) acrylate ester.
It contains 5 mol%. In particular, the component derived from the (meth) acrylic acid ester is 2 mol% or less, preferably 0.3 to
Ethylene ・ (meth) acrylic acid ・
(Meth) acrylic acid ester terpolymers are preferable because they have excellent breaking strength, and therefore, troubles such as tearing during packaging hardly occur.

Melt flow rate of ethylene / (meth) acrylic acid / (meth) acrylate terpolymer (A)
(Measured at 190 ° C. according to STM D1238).
5 to 30 g / 10 min.

In the present invention, the ethylene / (meth) acrylic acid / (meth) acrylate terpolymer is preferably contained in 100 parts by weight of the polyolefin resin component in the resin composition for forming a film. It is preferable to contain 100 parts by weight, more preferably 60 to 100 parts by weight.
In this range, especially in the range where the content of the (meth) acrylic acid ester component is small, especially in the polyolefin-based resin of 7% by weight or less, the film has excellent breaking strength,
A material having an excellent stress balance during elongation of D is obtained. Furthermore, the polyolefin-based resin is substantially
The resin is preferably a resin composed of a (meth) acrylic acid / (meth) acrylic ester terpolymer.

The polyolefin resin comprising the above-mentioned ethylene / (meth) acrylic acid copolymer or ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer alone or as a mixed resin may be used in the present invention. It is a base resin for polyolefin-based stretch films. By using these as base resins, it is possible to obtain the transverse cut properties, adhesion, and finger pressure recovery properties required for stretch films for packaging, as well as excellent T-die extrusion moldability. .

In the present invention, in addition to the above base resin,
Other resins may be added as long as the object of the invention is not impaired. Other resins that may be added include polyethylene, ethylene / α-olefin copolymers, ethylene / vinyl acetate copolymers, and the like, alone or in combination of two or more.

In the present invention, the proportion of the (meth) acrylate component contained in the base resin is preferably 7% by weight or less, more preferably 5% by weight or less. Is excellent in breaking strength. There is no particular lower limit on the proportion of the (meth) acrylate component contained in the base resin, but it is usually at least 0.1% by weight, preferably at least 1% by weight, more preferably at least 2% by weight.

In order to improve the adhesive properties and transparency of the stretch film, the ethylene / (meth) acrylic acid copolymer or the ethylene / (meth) acrylic acid / (meth) acrylic acid ester terpolymer is preferably used. For 100 parts by weight of a polyolefin resin composed of a single resin or a mixture thereof, 0.5 to 12 parts by weight of tackifier, preferably 2 to 10 parts by weight, and 1 to 5 parts by weight of an antifogging agent,
Preferably, a resin composition added at a ratio of 1.5 to 4 parts by weight is used.

Tackifier is a solid amorphous polymer and is usually used as a tackifier in applications such as pressure-sensitive adhesive tapes, paints, and hot melt adhesives.
The following resins can be listed according to the type of the monomer source to be polymerized.

For example, a C4 cut obtained by cracking petroleum, naphtha and the like, a C5 cut, a mixture thereof, or an arbitrary cut thereof, for example, isoprene and 1,3-pentadiene in the C5 cut are mainly used. Aliphatic hydrocarbon resin as a component; aromatic hydrocarbon resin mainly composed of styrene derivative and indene in C9 fraction obtained by cracking petroleum, naphtha, etc .; C4 fraction and C5
Aliphatic / aromatic copolymerized hydrocarbon resin obtained by copolymerizing an arbitrary fraction of fraction and C9 fraction; Alicyclic hydrocarbon resin obtained by hydrogenating aromatic hydrocarbon resin; Aliphatic or alicyclic Synthetic terpene-based hydrocarbon resin having a structure containing styrene and aromatic hydrocarbon resin; terpene-based hydrocarbon resin derived from α, β-pinene in turpentine oil; indene and styrenes contained in coal-tar naphtha Coumarone indene hydrocarbon resin; low molecular weight styrene resin; rosin hydrocarbon resin.

Among these tackifiers, an aliphatic hydrocarbon resin obtained by hydrogenating an aliphatic hydrocarbon resin and an aromatic hydrocarbon resin is dispersed in an ethylene / (meth) acrylic acid copolymer. It is preferably used because it has good properties. Further, alicyclic hydrocarbons having a softening point (ring and ball method) of 105 to 150 ° C., particularly 110 to 140 ° C., and a hydrogenation rate of at least 80%, particularly at least 85%, of aromatic nuclei are particularly preferred. .

The antifogging agent is an additive compounded to prevent water in the air from condensing and fogging on the surface of the film. The antifogging agent is formed by making the surface of the film hydrophilic and condensing the water. There is no particular limitation as long as it acts to spread water droplets.

For example, a surfactant is used as such an antifogging agent, and sorbitan fatty acid esters such as sorbitan monooleate, sorbitan monolaurate, sorbitan monobehenate and sorbitan monostearate;
Glycerin fatty acid esters such as glycerin monooleate and glycerin monostearate; diglycerin monooleate, diglycerin sesquilaurate, diglycerin sesquioleate, tetraglycerin monooleate, tetraglycerin monostearate, hexaglycerin monooleate , Decaglycerin monooleate,
Polyglycerin fatty acid esters such as decaglycerin monolaurate; polyoxyalkylene ethers such as polyoxyethylene lauryl ether; aliphatic amines such as lauryl diethanolamine; fatty acid amides such as oleic acid amide. These may be used alone or as a mixture of two or more. Further, the stretch film according to the present invention may contain other additives as long as the object of the present invention is not impaired.

The stretch film according to the present invention is preferably produced by T-die extrusion using the above resin composition. In the T-die extrusion molding, as the orientation prevention treatment, for example, a molding temperature of 200 to 250 ° C., a draft ratio (stretch ratio within the draft distance) of 60 or less, a draft distance (distance from the tip of the die to the contact of the film with the cooling roll). It is preferable to carry out by a molding method such that the film is wound at a film temperature of 40 ° C. or more and a draw ratio of 1.2 times or less. Further, as the orientation preventing treatment, preferably, the film temperature is set to 50 to 90 ° C., and the annealing treatment is performed so that the dimensional change (shrinkage) in the longitudinal direction of the film is in the range of 1 to 5%. The orientation prevention treatment may be performed by the former forming method at the time of film forming,
The latter may be performed by annealing. Further, both may be performed in combination. Further, the annealing treatment can be performed after the film is formed.

The stretch film of the present invention thus formed has a thickness of about 10 to 200 μm and a stress at 100% elongation in the longitudinal direction of 12 to 30 MPa, preferably 16 to 30 MPa, more preferably 18 MPa. ~ 25M
Pa, particularly preferably 18 to 24 MPa, 10 in the lateral direction.
The stress at 0% elongation is 5 to 11 MPa, preferably 6 to 1 MPa.
0 MPa, more preferably in the range of 6 to 8 MPa. In addition, the longitudinal orientation of the film is suppressed, and the longitudinal / lateral balance of the stress at the time of elongation is balanced. The stress at the time of 100% elongation in the machine direction (MD) and the stress at the time of 100% elongation in the transverse direction (TD) Ratio (MD / TD) is preferably 1.5 to
3.0, more preferably in the range of 1.7 to 2.5.

As a result, a stretch film which is excellent in lateral cut properties, adhesion properties and finger pressure restoring properties, hardly generates surface wrinkles during packing, has excellent suitability for an automatic wrapping machine, and has few cuts even when stretch wrapping is performed continuously. Can be

In addition, it is economically preferable because it can be produced by a T-die extrusion molding method having excellent productivity without using a conventional blown film molding method.

In the stretch film of the present invention, a film layer made of another resin may be laminated on one or both sides of the film layer made of the above resin composition, depending on the use. In this case, the stress at the time of 100% elongation as a laminated film is in the above range.

The other resin to be laminated is, for example, a polyolefin containing ethylene or propylene as a main component. Specific examples include polyethylene and polypropylene, ethylene / α-olefin copolymers, propylene / ethylene / propylene. Examples include at least one polymer of a film-formable polymer such as a butene copolymer. The melt flow rates of these polymers (ASTM
D1238 standard, measured at 190 ° C) is usually 0.5 to 3
It is about 0 g / 10 minutes.

When the stretch film is a laminated film, the total thickness of the other resin layers to be laminated is usually 1 to 5
It is about 0 μm, preferably about 2 to 30 μm. As a method for forming the laminated film, a known method such as a co-extrusion method by T-die extrusion or an extrusion lamination method can be used.

[0040]

EXAMPLES Next, the present invention will be specifically described with reference to Examples.
The present invention is not limited to these examples. In addition, the evaluation method in this example and a comparative example is shown below. Tensile test Using Instron type tensile tester, distance between chucks 50
mm, tensile speed 500 mm / min, test specimen shape ASTM
The stress and breaking strength at an elongation of 100% were measured by D638 type-1. Film thickness measurement The average thickness was determined from the thickness measured at 2 cm intervals in the width direction of the film, and this was repeated five times at 10 m intervals in the length direction of the film, and the average value was taken as the film thickness of the film. The standard deviation was determined from the variation in the measured thickness. The contraction rate was calculated by the following equation. Shrinkage (%) = {(feeding roll side speed−taking-off roll side speed) / feeding roll side speed} × 100

Example 1 A resin temperature of 220 ° C., a draft ratio of 50 and a draft distance of 80 m were obtained by a T-die extrusion molding method.
The film after casting is subjected to an annealing treatment at a film temperature of 80 ° C. to a shrinkage ratio of 2% in the vertical direction at a film temperature of 80 ° C. before being wound, cooled to 30 ° C. or less, and taken up at a take-off speed of 250 m / min A 12 μm stretch film was formed. This film is placed in an automatic packaging machine (Teraoka Seiko A
W-3600) (film width 350m)
m), polystyrene tray with food (depth 1
(00 mm, width 150 mm).
At this time, the film is stretched about 1.2 times in the horizontal direction. In this case, the frequency of occurrence of tearing of the film and the frequency of occurrence of surface wrinkles during packing were examined for 100 trays. The result is expressed as the length and width (MD / TD) of the film.
The results are shown in Table 1 together with the measured stress values at the time of 00% elongation. In addition,
The adhesion between the obtained stretch film and the polystyrene tray was good.

The formulation of the resin used is as follows. Ethylene / methacrylic acid copolymer: 76 parts by weight (methacrylic acid component content: 3.5 mol% (10% by weight), melt flow rate: 8 g / 10 min.) ) Ethylene / methacrylic acid / isobutyl acrylate terpolymer 20 parts by weight (methacrylic acid component content 3.4 mol% (9 wt%), isobutyl acrylate component content 2.0 mol% ( 8 wt%), melt flow rate 10 g / 10 min) Tack Fire 2 parts by weight (Clearon ^™ P-125 manufactured by Yashara Chemical Co., Ltd.) ) Anti-fog agent (O-71D manufactured by RIKEN VITAMIN CO., LTD.) 2 parts by weight

Example 2 A stretch film was produced in the same manner as in Example 1 except that the resin formulation was changed as follows. The film was subjected to automatic pack packaging in the same manner as in Example 1, and the frequency of film tearing and the frequency of wrinkling during packing were examined.
The results are shown in Table 1 together with the measured values of stress at 100% elongation of D). The adhesion between the obtained stretch film and the polystyrene tray was good.

The resin formulation is as follows. Ethylene / methacrylic acid / isobutyl acrylate terpolymer: 96 parts by weight (methacrylic acid component content 3.4 mol% (9 wt%), isobutyl acrylate component content 1.0 mol% (4 wt%), melt flow rate 10 g / 10 min) tackifier Fire ······················· 2 parts by weight (Yasuhara Chemical Co. Clearon ^TM P-125) Anti-fog agent (O-71D manufactured by Riken Vitamin Co., Ltd.) 2 parts by weight

[0045]

[Table 1]

Example 3 A resin temperature of 220 ° C., a draft ratio of 50 and a draft distance of 80 m were obtained by a T-die extrusion molding method.
m, the film after casting is stretched at a temperature of 45 ° C. (cast roll temperature of 30 ° C.) at a stretch ratio of 1.1 times, and before winding, is annealed at a film temperature of 60 ° C. to a longitudinal shrinkage of 4%. The film was treated, cooled to 30 ° C. or lower, and a stretch film having a thickness of 12 μm was formed at a take-off speed of 250 m / min. This film was set on an automatic packaging machine (AW-3600 manufactured by Teraoka Seiko Co., Ltd.) (film width: 350 mm), and was automatically packaged on a polystyrene tray (150 mm deep, 200 mm wide) on which food was placed. At this time, the film is stretched about 1.7 times in the horizontal direction. The results of examining the frequency of film tearing at that time and the frequency of surface wrinkles during packing
Film thickness accuracy (standard deviation), length and width (MD / TD)
Are shown in Table 2 together with the measured values of the stress at 100% elongation and the breaking strength.

The formulation of the resin used is as follows. Ethylene / methacrylic acid copolymer: 36 parts by weight (methacrylic acid component content: 3.5 mol% (10% by weight), melt flow rate: 8 g / 10 Min) Ethylene / methacrylic acid / isobutyl acrylate terpolymer: 60 parts by weight (methacrylic acid component content 3.4 mol% (9 wt%), isobutyl acrylate component content 2.0 mol%) (8 wt%), melt flow rate 10 g / 10 min) tackifier Fire ······················· 2 parts by weight (Yasuhara Chemical Co. Clearon ^TM P- 125) Antifogging agent (O-71D manufactured by Riken Vitamin Co., Ltd.) 2 parts by weight

Example 4 A stretch film was produced in the same manner as in Example 3, except that the resin formulation was changed as follows. The film was subjected to automatic pack packaging in the same manner as in Example 3, and the results of examining the frequency of occurrence of tearing of the film and the frequency of wrinkling at the time of packing were used to determine the thickness accuracy of the film (standard deviation), the length and width (MD / TD) ) Are shown in Table 2 together with the measured values of the stress and the breaking strength at 100% elongation.

The resin formulation is as follows. Ethylene / methacrylic acid / isobutyl acrylate terpolymer: 96 parts by weight (methacrylic acid component content 3.4 mol% (9 wt%), isobutyl acrylate component content 1.0 mol% (4 wt%), melt flow rate 10 g / 10 min) tackifier Fire ······················· 2 parts by weight (Yasuhara Chemical Co. Clearon ^TM P-125) Anti-fog agent (O-71D manufactured by Riken Vitamin Co., Ltd.) 2 parts by weight

Comparative Example A resin temperature of 220 ° C., a draft ratio of 70, and a draft distance of 40 mm were obtained by a T-die extrusion molding method.
A film was produced in the same manner as in Example 3 except that the film after casting was wound at a temperature of 30 ° C. (cast roll temperature of 20 ° C.) at a stretch ratio of 1.3. This film was subjected to automatic pack packaging in the same manner as in Example 3, and the results of examining the frequency of occurrence of tearing of the film and the occurrence of surface wrinkles during packing were evaluated based on the thickness accuracy of the film (standard deviation), length and width (MD / Table 2 shows the stress and the breaking strength measured at 100% elongation of TD).

[0051]

[Table 2]

[0052]

Since the stretch film of the present invention uses a polyolefin polymer, it does not have the environmental problems and safety and health problems of conventional polyvinyl chloride, and has a large elongation, excellent lateral cut properties, and excellent adhesion. , Acupressure restoration, etc., and the stress at the time of proper elongation and its length / width (M
(D / TD) is balanced, so it can be packaged without wrinkles on the surface, is suitable for automatic packaging machines, has little breakage even when stretch-wrapped continuously, and is used as a stretch film for packaging foods and various other products. It can be suitably used. Also, high productivity can be achieved because T-die high-speed molding can be performed. According to the production method of the present invention, the above-mentioned stretch film can be produced with high productivity, so that the production method is excellent in economic efficiency.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiyuki Ishii 2-1-1 Tango-dori, Minami-ku, Nagoya City, Aichi Prefecture Inside of Mitsui Chemicals Platec Co., Ltd. (72) Inventor Toshiki Ito 2-1-1 Tango-dori, Minami-ku, Nagoya City, Aichi Prefecture Address F-term in Mitsui Chemicals Platec Co., Ltd. (reference) 4F071 AA15X AA32X AA33X AF15 AF30 AF58 AH04 BA01 BB06 BB08 BC01 4J002 AF023 BA013 BB071 BB081 CE003 CH052 EH056 EN126 EP016 FD202 FD206 FD343

Claims (10)

[Claims] 1. A polyolefin resin comprising a homopolymer of ethylene / (meth) acrylic acid copolymer or ethylene / (meth) acrylic acid / (meth) acrylate terpolymer, or a mixed resin thereof. Resin and
A film comprising a resin composition containing an antifogging agent and a tackifier as required, wherein the stress at the time of 100% elongation in the machine direction (MD) is 12 to 30 MPa, and the stress in the transverse direction (TD) ) Is 5-11MP at 100% elongation
(a) a polyolefin-based stretch film, 2. A resin composition comprising 0.5 to 12 parts by weight of tackifier and 1 to 5 parts by weight of an antifogging agent based on 100 parts by weight of the polyolefin resin. Item 4. The polyolefin-based stretch film according to Item 1. 3. The ethylene / (meth) acrylic acid copolymer according to claim 3, wherein the content of the (meth) acrylic acid component in the ethylene / (meth) acrylic acid copolymer is 3 to 20 mol%. 2. The terpolymer according to claim 1, wherein the content of the (meth) acrylic acid component is 3 to 20 mol% and the content of the (meth) acrylate component is 0.3 to 20 mol%. Or the polyolefin-based stretch film according to 2. 4. The polyolefin-based stretch film according to claim 1, wherein the content of the (meth) acrylate component in the polyolefin-based resin is 7% by weight or less. 5. The resin according to claim 1, wherein the polyolefin-based resin is a resin containing at least 60% by weight of an ethylene / (meth) acrylic acid / (meth) acrylate ester terpolymer. The polyolefin-based stretch film according to any one of the above. 6. The resin according to claim 1, wherein the polyolefin resin is a resin substantially composed of an ethylene / (meth) acrylic acid / (meth) acrylate ester terpolymer. The polyolefin-based stretch film described in Crab. 7. The ratio (M) between the stress at 100% elongation in the machine direction (MD) and the stress at 100% elongation in the transverse direction (TD).
D / TD) is 1.5-3.0, The polyolefin stretch film in any one of Claims 1-6 characterized by the above-mentioned. 8. The method according to claim 1, comprising a film obtained by T-die extrusion molding of the resin composition.
8. The polyolefin-based stretch film according to any one of 7. 9. The polyolefin-based stretch film according to claim 8, wherein the film is obtained by T-die extrusion molding of the resin composition, and is a film that has been subjected to an orientation prevention treatment. 10. A polyolefin resin comprising an ethylene / (meth) acrylic acid copolymer or an ethylene / (meth) acrylic acid / (meth) acrylate terpolymer alone or a mixed resin thereof. When forming a resin composition containing a resin and, if necessary, an antifogging agent and a tackifier, by T-die extrusion molding, an anti-orientation treatment is performed during or after film formation. Stretch film manufacturing method.