JP2004345130A - Anti-fogging laminated film and easily openable container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-fogging laminated film capable of being obtained at a low cost by air cooling inflation molding excellent in productivity as a film molding technique, having high transparency and excellent see-through and sutable for use as the easily peelable sealing material of a food container. <P>SOLUTION: This anti-fogging laminated film has a polypropylene resin layer (A) and the anti-fogging layer (B) laminated on the polypropylene resin layer (A) in a contact state. The polypropylene resin layer A is formed by the air cooling inflation of a polyolefin composition, which contains 30 wt.% or above of a polypropylene resin, polymerized using a single site catalyst and the polypropylene resin shows a relation of 1.4Tc-50≥ΔHm≤1.4T<SB>C</SB>-60 [wherein Tc is a crystallizing temperature (°C) and ΔHm is a crystal melting calorie (J/g)]. The anti-fogging layer (B) contains 0.3-1.0 wt.% of an anti-fogging agent and comprises a polyolefin layer having a thickness of 4-25 μm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００６９】
【表２】

【図面の簡単な説明】
【図１】本発明防曇性積層フィルムの一例を示す縦断面
【図２】本発明防曇性積層フィルムの他の例を示す縦断面
【図３】本発明防曇性積層フィルムを易開封性容器に使用した例を示す断面図
【符号の説明】
１：防曇性積層フィルム
Ａ：ポリプロピレン系樹脂層
Ｂ：防曇層
Ｃ：熱可塑性樹脂保護層
４：容器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antifogging laminated film excellent in antifogging property, transparency and peeling appearance and suitable for food packaging applications, and an easily-openable container using the same.
[0002]
[Prior art]
BACKGROUND ART Thermoplastic resins such as polypropylene are widely used as food packaging materials because they are hygienic and excellent in transparency. For example, containers such as pudding and mousse, lunch boxes, and the like are used by being sealed with a transparent resin such as polyprolene or polyester so that the contents can be visually inspected. Transparent containers that can be easily opened by welding a film-like sealing material have become widespread.
[0003]
However, depending on the contents, moisture in the container may cause water droplets to adhere to the inner surface of the sealing material and cause fogging, making it difficult to visually recognize the contents. For this reason, the phenomenon of fogging of the sealing material is conventionally prevented by kneading the antifogging agent into the sealing material (Patent Document 1) or applying the surface of the antifogging agent to the surface. Although a method has been adopted, the fact is that it has not yet reached a stage where it can be said to be sufficient in terms of the persistence of the anti-fogging effect, the variation in the opening strength, and the appearance of peeling.
[0004]
Further, when a film-like sealing material to be welded to the container mouth, that is, an easy-peeling sealant is kneaded with the antifogging agent, the antifogging agent is diffused and disappears, and the antifogging effect is reduced with time. There is a problem that it decreases. In addition, such a sealant is generally used as a laminate film in combination with a stretched base material such as polyester or polyamide, but the adhesive strength between the sealant and the stretched base material is changed due to migration of the antifogging agent. Adversely affect the base material, the base material and the sealant may be peeled off, the transparency may deteriorate, and the appearance may be impaired.
[0005]
Further, when the anti-fogging agent is applied, there is a problem that the anti-fogging agent drops off or runs off, and the anti-fogging effect varies.
[0006]
Regarding this problem, it is known to provide a layer of polypropylene or the like between the sealant layer containing the antifogging agent and the external protective layer to prevent migration of the antifogging agent. When used, the polypropylene layer adjacent to the sealant layer prevents migration of the anti-fogging agent, and exhibits long-lasting anti-fogging properties, and also has the effect of preventing a decrease in laminate adhesive strength with the substrate. Can be done.
[0007]
However, when a crystalline resin such as a polypropylene resin is molded using a slow cooling method such as air-cooled inflation, the transparency is reduced. There is a problem that is impaired. Therefore, when a polypropylene resin or the like is used, a rapid cooling method such as water-cooled inflation molding or T-die extrusion molding is required to obtain a transparent resin layer. However, the water-cooled inflation molding machine has a problem that the production equipment becomes large and the production management becomes complicated, so that the production cost increases.
[0008]
For this reason, there has been a demand for the development of a packaging container sealing film that can be formed by air-cooled inflation that is small in production equipment and easy to control for production, and that provides a sealing material with excellent transparency.
[0009]
[Patent Document 1] Japanese Patent No. 2918661 [0010]
[Problems to be solved by the invention]
The present invention provides a method for forming a film, which can be obtained at low cost by air-cooled inflation molding with small production equipment and excellent productivity, high transparency, excellent transparency, and easy peelability of food containers. An object of the present invention is to provide a laminated film suitable for use as a sealing material.
[0011]
[Means for Solving the Problems]
The present invention, as a result of intensive studies to solve the above problems, by using a specific polypropylene resin into a multilayer structure film, even when using the air-cooled inflation molding method, extremely transparent which did not exist until now And a film having excellent transparency can be obtained. Specifically, the following polypropylene-based resin layer (A) and the following protective film laminated in contact with the polypropylene-based resin layer (A) are provided. The present invention provides an anti-fogging laminated film having a fogging layer (B).
[0012]
(A) A polypropylene-based resin layer obtained by molding a polyolefin composition containing at least 30% by weight of a polypropylene-based resin which is polymerized by using a single-site catalyst and satisfies the following formula (1) by an air-cooled inflation method. System resin:
When the crystallization temperature (Tc) is expressed in ° C. and the heat of crystal fusion (ΔHm) is expressed in J / g, the following relationship is obtained: 1.4 Tc-50 ≧ ΔHm ≧ 1.4 Tc-60 (1)
(B) An antifogging layer comprising a polyolefin having a thickness of 4 to 25 μm, containing 0.3 to 1.0% by weight of an antifogging agent.
Further, the present invention provides the above antifogging laminated film in which a thermoplastic resin protective layer is laminated on the outside of the polypropylene resin layer (A), wherein the antifogging layer is obtained by impregnating a vinyl compound with a polyolefin and polymerizing it. The above-mentioned anti-fogging laminated film comprising the composite resin obtained, and the above-mentioned anti-fogging laminated film which is welded to the periphery of the container opening and is used as a sealing material for sealing the container opening. Things.
[0014]
Furthermore, the present invention provides an easy-opening container in which any one of the above-mentioned antifogging laminated films is heat-sealed to the periphery of the opening of the resin container and the opening is sealed, with the antifogging layer side inside. To provide.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the antifogging laminated film 1 of the present invention comprises a polypropylene resin layer (A) and an antifogging layer (B) laminated in contact with the polypropylene resin layer (A). You.
[0016]
The polypropylene-based resin layer (A) is polymerized using a single-site catalyst, and a polyolefin composition containing 30% by weight or more of a polypropylene-based resin satisfying the following formula (1) is formed by an air-cooled inflation method. Formed by
[0017]
Polypropylene resin:
When the crystallization temperature (Tc) is expressed in ° C. and the heat of crystal fusion (ΔHm) is expressed in J / g, the following relationship is obtained: 1.4 Tc-50 ≧ ΔHm ≧ 1.4 Tc-60 (1)
[0018]
The crystallization temperature (Tc) and the heat of crystal fusion (ΔHm) in the present invention can be determined by the following measurement methods. That is, using a differential calorimeter (for example, DSC7 type manufactured by PerkinElmer), 10 mg of a polypropylene sample was previously melted at 230 ° C. for 3 minutes in a nitrogen atmosphere, and then cooled to 0 ° C. at 10 ° C./min. The peak top temperature on the highest temperature side of the crystallization curve obtained at this time is the crystallization temperature (Tc) (° C.), and after further holding at this temperature for 3 minutes, increasing the temperature at 10 ° C./min. The differential heat of the curve is the crystal heat of fusion (ΔHm) (J / g).
[0019]
When the heat of crystal fusion (ΔHm) of the polypropylene resin exceeds 1.4 Tc-50, the extrudability during inflation deteriorates, the rigidity increases, the impact strength decreases, and 1.4 Tc-60. When it is smaller, the transparency is lowered, and an excellent packaging film cannot be obtained. By using a polypropylene-based resin satisfying the above formula (1), the transparency is obtained even when molded by the air-cooled inflation method for the first time. Can be obtained, and it can be manufactured at low cost.
[0020]
The single-site catalyst for obtaining the polypropylene-based resin satisfying the above formula (1) substantially refers to a catalyst constituted by homogeneous polymerization active sites, and specifically, a metallocene-based transition metal compound (so-called, And a polymerization catalyst composed of a non-metallocene transition metal compound (Brookhardt catalyst, phenoxyimine complex, etc.) and a co-catalyst (methylaluminoxane, boron compound, etc.).
[0021]
The most preferably used single-site catalyst is a polymerization catalyst containing a metallocene transition metal compound as a main component. Examples of the metallocene-based transition metal compound (component a) include those represented by the following general formula (1).
[0022]
^{_{Q (C 5 H 4-a}} R 1 a) (C 5 H 4-b R 2 b) MeXY ·· (1)
[0023]
[Where Q is a linking group bridging the two conjugated five-membered ring ligands, Me represents zirconium or hafnium, and X and Y each independently represent hydrogen, halogen, C 1-20. A hydrocarbon group, a C1-20 alkoxy group, a C1-20 alkylamide group, a trifluoromethanesulfonic acid group, a C1-20 phosphorus-containing hydrocarbon group or a C1-20 silicon-containing Represents a hydrocarbon group. R ¹ and R ² each independently represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen, an alkoxy group, a silicon-containing hydrocarbon group, a phosphorus-containing hydrocarbon group, a nitrogen-containing hydrocarbon group, or a boron-containing hydrocarbon group. the stands, two ^{R 1} and ^{R 2} adjacent the two ^R 1, ^{R 2} may be bonded to each other to form a ring. a and b are integers satisfying 0 ≦ a ≦ 4, and 0 ≦ b ≦ 4. However, the two five-membered ring ligands having R ¹ and R ² are asymmetric with respect to the plane containing Me in terms of relative position via the group Q. ]
[0024]
Q in the general formula (1) is a binding group that bridges two conjugated five-membered ring ligands. Specifically, (A) divalent having 1 to 20 carbon atoms, preferably 1 to 6 carbon atoms; Hydrocarbon group, more specifically, for example, an unsaturated hydrocarbon group such as an alkylene group, a cycloalkylene group, an arylene group, or a (ii) silylene group having a hydrocarbon group having 1 to 20, preferably 1 to 12 carbon atoms. And (c) a germylene group having a hydrocarbon group having 1 to 20, preferably 1 to 12 carbon atoms.
[0025]
Such a metallocene transition metal compound is used as a catalyst in combination with a cocatalyst for activating the metallocene transition metal compound. As such a cocatalyst (component b), the following components (b-1) to (b-4) can be selected and used.
[0026]
Component (b-1): an aluminum oxy compound,
Component (b-2): Lewis acid,
Component (b-3): an ionic compound capable of converting component a into a cation;
Component (b-4): ion-exchange layered silicate
The aluminum oxy compound (component (b-1)) is a compound also called alumoxane, and a product obtained by reacting a trialkylaluminum with water can be used.
[0028]
Further, as the ionic compound (component (b-3)) capable of converting the component a into a cation, a compound represented by the general formula (3) is preferable.
[0029]
[K] ^{e +} [Z] ^e- (3)
[0030]
Here, K is an ionic cation component, and examples thereof include a carbonium cation, a tropylium cation, an ammonium cation, and an oxonium cation.
[0031]
Z in the above general formula (3) is an ionic anion component, and examples thereof include an organic boron compound anion and an organic aluminum compound anion.
[0032]
In the present invention, at least one compound selected from the group consisting of ion-exchanged layered silicates used as the component (b-4) is stacked in parallel with planes formed by ionic bonds or the like with weak bonding force. Is a silicate compound having a crystal structure that has an exchangeable ion.
[0033]
Most ion-exchanged phyllosilicates naturally occur mainly as a main component of clay minerals, but these ion-exchanged phyllosilicates are not limited to natural ones but are artificially synthesized. May be.
[0034]
Examples of the ion-exchange layered silicates include, for example, sericite groups such as dickite, nacrite, kaolinite, anoxite, metahaloisite, halloysite, etc., chrysotile, lizardite, antigolite, serpentine group, montmorillonite, zaukonite, beidellite, Examples include smectites such as nontronite, saponite, hectorite, and stevensite; vermiculites such as vermiculite; mica such as mica, illite, sericite, and chlorite.
[0035]
The polypropylene resin of the present invention uses a propylene homopolymer obtained by polymerizing propylene alone, or a propylene copolymer obtained by copolymerizing propylene and a small amount of ethylene or an α-olefin other than propylene with such a catalyst. Can be
[0036]
Such a polypropylene resin can be used alone, or can be melt-kneaded with another polyolefin and used as a resin composition according to the purpose.
[0037]
As the other polyolefin, a homopolymer or a copolymer of an α-olefin having 2 to 12 carbon atoms can be used. Specifically, high-density polyethylene, high-pressure low-density polyethylene, linear low- Olefin polymers such as high density polyethylene, polypropylene, ethylene / propylene random copolymer, ethylene / propylene block copolymer, and polybutylene can be used.
[0038]
It is desirable that the polypropylene resin satisfying the above formula (1) is blended in an amount of 30% by weight or more based on the resin composition. If it is less than 30% by weight, the effect of the addition becomes small. It is preferably at least 50% by weight, more preferably at least 80%.
[0039]
Various additives can be added to the polyolefin composition constituting the polypropylene resin layer (A) according to the purpose. Specifically, phenolic, organic phosphite-based, organic phosphorus-based antioxidants such as phosphite, thioether-based antioxidants; hindered amine-based light stabilizers; benzophenone-based, benzotriazole-based, benzoate-based ultraviolet absorbers, etc. Nonionic, cationic and anionic antistatic agents;
[0040]
These additives are appropriately combined and blended in any step of producing a polyolefin composition. The compounding of the additives may be prepared by mixing at a predetermined ratio using a kneading device such as a conventionally known twin-screw extruder, a Banbury mixer, a kneader, a mixing roll, and melt-kneading the mixture. A so-called masterbatch having a high concentration may be prepared, and may be diluted for use.
[0041]
The polyolefin composition forming the polypropylene resin layer (A) is molded by an air-cooled inflation molding method. The air-cooled inflation molding method can be performed by a method known per se. The polypropylene resin layer (A) can be biaxially stretched after forming the polyolefin composition into a film, and is a preferable method.
[0042]
The polypropylene-based resin layer (A) contains a 0.3% to 1.0% by weight of an antifogging agent in contact with the polypropylene-based resin layer (A), and is made of a polyolefin having a thickness of 4 to 25 μm. The cloudy layer (B) is laminated.
[0043]
As the polyolefin for forming the anti-fog layer (B), general polyolefins can be widely used, but those having excellent transparency are desirable. Specifically, α-olefins having 2 to 12 carbon atoms alone are used. Polymers, or copolymers can be used, specifically, high-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene random copolymer, ethylene-propylene block A copolymer or the like can be used alone or as a mixture of two or more.
[0044]
These polyolefins for the antifogging layer (B) are compounded with an antifogging agent. As the anti-fogging agent, an anionic surfactant, a nonionic surfactant, a cationic surfactant, an amphoteric surfactant and the like can be used.
[0045]
Specific examples include polyoxyalkylene ethers, partial esters of polyhydric alcohols, partial esters of alkylene oxide adducts of polyhydric alcohols, alkali metal salts of higher alcohol sulfates, alkylaryl sulfonates, quaternary ammonium, and fatty acid amine derivatives. be able to.
[0046]
Among them, nonionic surfactants mainly containing an ester of a fatty acid having 14 to 22 carbon atoms with a polyhydric alcohol such as sorbitan, sorbitol, glycerin, propylene glycol or an alkylene oxide adduct thereof are preferable.
[0047]
When the antifogging laminated film of the present invention is used for food packaging, it is selected from these surfactants in view of food hygiene.
[0048]
The antifogging agent is added in an amount of 0.3 to 1.0% by weight, preferably 0.4 to 0.8% by weight. When the amount of the antifogging agent is less than 0.3% by weight, the antifogging property is poorly expressed. Easy to cause.
[0049]
The thickness of the antifogging layer is desirably 4 to 25 μm, preferably 5 to 15 μm. When the thickness of the antifogging layer is less than 4 μm, the heat sealing property when used as a packaging bag or an easy-peeling sealant decreases, and when it exceeds 25 μm, the transparency decreases.
[0050]
When the antifogging laminated film of the present invention is used as an easy-peeling sealant, it is preferable to add a release improver. As the releasability improver, a composite resin obtained by impregnating an olefin polymer with a vinyl monomer and then subjecting the same to polymerization conditions can be used.
[0051]
As the olefin polymer impregnated with the vinyl monomer, the same olefin polymer as the olefin polymer forming the anti-fogging layer (B) can be used. Low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene block copolymer, or the like can be used.
[0052]
These olefin polymers are impregnated with a vinyl monomer and subjected to polymerization conditions. The amount of the vinyl monomer impregnated is in the range of 10 to 80 parts by weight, preferably 20 to 80 parts by weight, based on 100 parts by weight of the olefin polymer. When the impregnation amount of the vinyl monomer is less than 10 parts by weight, the vinyl polymer in the obtained composite resin becomes excessively fine particles, and the release effect is reduced. Is more than 80 parts by weight, the dispersed particles of the vinyl polymer in the composite resin become coarse and the transparency is reduced.
[0053]
Examples of the vinyl monomer include styrene-based monomers such as styrene, α-methylstyrene, monochlorostyrene, p-methylstyrene, and ethylstyrene, and acrylics such as acrylic acid, acrylic acid ester, acrylamide, methacrylic acid, and methacrylic acid ester. A system monomer can be used. The alcohol residue in the acrylate monomer is preferably an alkyl group having 1 to 8 carbon atoms.
[0054]
The polymerization of the vinyl monomer can be carried out by using a radical generator. Examples of the radical generator include cumene hydroperoxide, acetyl peroxide, succinic acid peroxide, benzoyl peroxide, and dicumyl peroxide. And azo compounds such as azobisisobutylnitrile, diazoaminobenzene, and bisazoester.
[0055]
The amount of the composite resin impregnated and polymerized with the vinyl monomer added to the antifogging layer (B) is 10 to 70 parts by weight, preferably 20 to 100 parts by weight, based on 100 parts by weight of the olefin polymer forming the antifogging layer (B). -40 parts by weight is desirable.
[0056]
As a means for laminating the polypropylene resin layer (A) and the antifogging layer (B), a method known per se can be adopted, and the polypropylene resin layer (A) and the antifogging layer (B) To form a multilayer by using a heat laminating method or the like, a method of extruding and laminating an antifogging layer (B) on the surface of a film to be a polypropylene resin layer (A), or a multilayer coextrusion method. It can be appropriately selected from known means such as extrusion molding as a laminated film and used.
[0057]
Further, in the antifogging laminated film of the present invention, a thermoplastic resin protective layer (C) can be formed outside the polypropylene resin layer (A) as shown in FIG. 2 according to the purpose. As the thermoplastic resin protective layer (C), a resin excellent in surface gloss, a resin excellent in mechanical strength such as scratch resistance, tensile strength, and the like can be appropriately selected according to the purpose. For example, high-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, polypropylene, polyester, polyamide and the like can be used, and among them, biaxially stretched polyolefin and polyester are preferable.
[0058]
Since the anti-fogging laminated film 1 of the present invention is excellent in transparency, it can be formed into a bag shape and used as a packaging bag for various products. In particular, as a packaging bag for food containing a large amount of water, Alternatively, it can be used as a film for sealing an easy-open container (easy peeling sealant).
[0059]
As shown in FIG. 3, the antifogging laminated film 1 of the present invention can be used as a sealing material for the easily-openable container 4. Can be widely selected according to the purpose. For example, high-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, polyolefin such as polypropylene, polyester, polyamide, polyvinyl chloride, polystyrene, impact-resistant polystyrene, ABS resin and the like can be used. As a molding method, injection molding, vacuum molding, or the like can be used.
[0060]
【The invention's effect】
Since the antifogging laminated film of the present invention has such a structure, a film having excellent transparency can be obtained even by a slow cooling method, and a simple and highly productive molding method such as air-cooled inflation molding can be used. Can be adopted. Therefore, a packaging film can be obtained at low cost, and since it is excellent in transparency, when used for packaging foods and the like, the contents can be clearly seen and the image of the product can be enhanced. Because of this, it shows excellent properties as a packaging film for products.
[0061]
【Example】
Hereinafter, examples will be described with reference to Tables 1 and 2 to describe the present invention in detail, but these examples do not limit the scope of the present invention in any way.
[0062]
(Evaluation method)
(1) Anti-fogging property: A black colored plate is fixed to the bottom of a polypropylene container, water at 15 ° C. is poured into about half of the container, and the opening is melted and sealed with a sealing material. For 24 hours. The visual recognition state of the black colored plate was observed, and the fogging state of the inner surface of the sealing material was determined.
(2) Transparency: Haze was measured according to JIS K7105.
(3) Peel strength: The heat seal strength for a 0.3 mm thick polypropylene sheet was determined according to JIS Z0238 sealed soft packaging bag.
(4) Peeling appearance: At the time of peeling strength measurement, the state after peeling was visually observed.
[0063]
The evaluation criteria were as shown in Table 2.
[0064]
(Test method)
As the polypropylene-based resin layer (A), polypropylene resin obtained by polymerizing propylene containing a small amount of ethylene using a metallocene catalyst as a single-site catalyst (Nippon Polychem Co., Ltd., brand name; Wintech WFX6, crystallization temperature ( Tc): 87.5 ° C., heat of crystal fusion (ΔHm) of 69.5 J / g), and polymerized using a titanium trichloride-based Ziegler catalyst as a multisite catalyst to produce a polypropylene resin (manufactured by Nippon Polychem Co., Ltd., brand name; X1804, crystallization temperature (Tc): 92.5 ° C., heat of crystal fusion (ΔHm) 72 J / g), and a polyethylene obtained by polymerizing ethylene containing a small amount of 1-hexene using a metallocene catalyst. Kernel KF273, manufactured by Nippon Polychem Co., Ltd., was blended in the ratio shown in Table 1, and an air-cooled inflation molding machine ( With chair diameter 80 mm), it was molded to a thickness of the film shown in Table 1.
[0065]
Further, as the anti-fog layer B, an easy-peel composite resin (VMX manufactured by Mitsubishi Chemical Co., Ltd., brand name: X260F), and as an anti-fogging agent, anti-fogging agent masterbatch (trade name, manufactured by Takemoto Yushi Co., Ltd.) Name: Elecut Master E-128 active ingredient 12%), using the antifogging resin obtained by blending the antifogging agent imparting the active ingredient in the amount shown in Table 1, using the polypropylene resin obtained above. Extruded and laminated on the film for layer (A).
[0066]
The obtained two-layer film was reheated with a hot plate, and a 12 μm-thick stretched polyethylene terephthalate film was heat-laminated to obtain a three-layer film.
[0067]
About the obtained laminated film, antifogging property, transparency, peel strength, and peel appearance were evaluated. Table 1 shows the results.
[0068]
[Table 1]

[0069]
[Table 2]

[Brief description of the drawings]
FIG. 1 is a longitudinal section showing an example of the anti-fogging laminated film of the present invention. FIG. 2 is a longitudinal section showing another example of the anti-fogging laminated film of the present invention. FIG. 3 is easily opened. Sectional view showing an example of use for a fusible container [Explanation of reference numerals]
1: Antifogging laminated film A: Polypropylene resin layer B: Antifogging layer C: Thermoplastic resin protective layer 4: Container

Claims (5)

An anti-fogging laminated film comprising: the following polypropylene resin layer (A); and the following anti-fogging layer (B) laminated in contact with the polypropylene resin layer (A).
(A) A polypropylene-based resin layer obtained by forming a polyolefin composition containing at least 30% by weight of a polypropylene-based resin which is polymerized using a single-site catalyst and satisfies the following formula (1) by an air-cooled inflation method. System resin:
When the crystallization temperature (Tc) is expressed in ° C. and the heat of crystal fusion (ΔHm) is expressed in J / g, the following relationship is obtained: 1.4 Tc-50 ≧ ΔHm ≧ 1.4 Tc-60 (1)
(B) An antifogging layer comprising a polyolefin having a thickness of 4 to 25 μm containing 0.3 to 1.0% by weight of an antifogging agent. The anti-fogging laminated film according to claim 1, wherein a thermoplastic resin protective layer is laminated on the outside of the polypropylene resin layer (A). The antifogging laminated film according to claim 1 or 2, wherein the antifogging layer contains a composite resin obtained by impregnating a vinyl compound with a polyolefin and polymerizing the polyolefin. The antifogging laminated film according to any one of claims 1 to 3, which is used as a sealing material that is welded to a peripheral edge of the container opening to seal the container opening. The anti-fogging laminated film according to any one of claims 1 to 4, wherein the anti-fogging layer side is inside, and the opening is sealed by heat welding to the periphery of the opening of the resin container. Easy opening container.

Images