JPH07285200A - Laminated resin film - Google Patents

Abstract

(57) [Summary] [Structure] Saponified ethylene-vinyl acetate copolymer
On one side or both sides of the oil film layer (A), shown by the following formula (I)
Glyceride (a₁) [Chemical 1] [In the formula, R¹, R²And R³One of them has 2 to 6 carbon atoms
Acyl group, and the other one is an acyl group having 8 to 22 carbon atoms.
And the other one is H or acyl having 2 to 22 carbon atoms.
It is a base. ] And a higher fatty acid having 12 to 22 carbon atoms
And an ester of aliphatic polyhydric alcohol,
And fatty acid ester having one alcoholic hydroxyl group
(A ₂0.5 to 15% by weight of an antifogging agent selected from
The crystalline propylene copolymer film layer (B)
Laminated laminated resin film. [Effect] Excellent transparency, heat resistance, cutability and texture,
In addition, it is a laminated resin with excellent adhesion and gas barrier properties.
A film was obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrap film for food packaging which is excellent in tackiness, heat resistance, cuttability, texture and gas barrier property.

[0002]

2. Description of the Related Art A wrapping film for food packaging is used for wrapping food in ordinary households, restaurants, etc. and storing it in a refrigerator or a freezer or heating it in a microwave oven (microwave cooker). Also, ramen, soba,
It is also used for serving soup etc. and for wrapping it on tableware containing the contents.

The food is wrapped here for the purpose of preventing the food from drying (water scattering), preventing dust from entering, and preventing the food from jumping out of the tableware. Such a wrapping film for food packaging has a width of 20 to 45 cm and a paper tube with a width of 20 to 45 cm.
It is wound up to about 100 m and stored in a paper carton box, which is used after being appropriately cut by a saw blade attached to the upper end of the side wall of the box.

The following items are required for this wrap film. Be transparent enough to see through the contents. When pulling back from the carton box by hand, do not tear it into small pieces. Be sticky. It must have heat resistance to the extent that the film does not melt when used in a microwave oven. Good tearability when cut with a saw blade.

At present, a wrap film using a vinylidene chloride resin is mainly used. However, there is a drawback that the wrap film is not cut along the saw blade at the time of cutting and is cut obliquely. As an alternative, ethylene resin is used in fields where heat resistance is not required.

However, since the wrap film made of ethylene resin is easily stretched and is not easily torn, a considerable tensile force is required at the time of cutting, the wrap film cannot be cut well, and the carton box is deformed. In addition, there are problems such as poor heat resistance when used in a microwave oven, and low stiffness of the film, making it difficult to handle.Therefore, it cannot be replaced with vinylidene chloride resin and is used only in a part of the market. It has not been.

Further, in recent years, new performances have been demanded for wrap films with the diversification of eating habits. As one of the performances, there is a demand for a gas barrier property that enables long-term storage of foods, prevents the flavors and aromas of foods from being stored, and prevents the absorption of aromas and odors from other foods.

[0008] As a laminate capable of satisfying this performance, there is disclosed a stretched laminate having a polypropylene-based compounding composition and an ethylene-vinyl alcohol copolymer as laminate constituent layers, as disclosed in JP-A-55-14204. And (b) a grafted polypropylene in which a polypropylene-based compound is graft-polymerized with a radically polymerizable unsaturated compound and (b) α-
Olefin (excluding propylene) content is 1-60
A polypropylene-based resin stretched laminate comprising a propylene-α-olefin random copolymer, which is 100% to 70% by weight of a propylene-α-olefin random copolymer, is proposed.

Further, in Japanese Patent Laid-Open No. 58-8644,
The polypropylene resin layer, the adhesive resin layer, the ethylene-vinyl acetate copolymer saponified resin layer, the adhesive resin layer and the polyolefin resin layer are multilayer plastic films that are adjacent in this order, and the total thickness of the film is 10 μm. To 150 μm, and the dimensional shrinkage ratio after 10 seconds in an atmosphere of 100 ° C. exceeds 10% in both length and width, a heat-shrinkable multilayer film, JP-A-3-13.
No. 2326, an outer layer is a layer made of a saponified ethylene-vinyl acetate copolymer, and this layer and a polypropylene resin layer are made of a polyolefin resin modified with an unsaturated carboxylic acid or an anhydride thereof. A resin is used as an adhesive layer, and the layer thickness of the saponified ethylene-vinyl acetate copolymer is 2 to 30 times that of the polypropylene resin layer.
Laminated films or sheets within the range of% have been proposed. However, these laminates have problems in tackiness, texture, antifogging property, etc. required for a wrap film, and are practically difficult to use.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems in a wrap film for food packaging, and the object thereof is, of course, transparency and anti-fogging property. Another object of the present invention is to provide a wrap film which is excellent in heat resistance, cuttability and texture, and is extremely excellent in tackiness and gas barrier property.

[0011]

Means for Solving the Problems A glyceride (a ₁ ) represented by the following formula (I) is formed on one side or both sides of an ethylene-vinyl acetate copolymer saponified resin film layer (A).

[0012]

[Chemical 2]

[Wherein R¹, R²And R³One of them is charcoal
An acyl group having a prime number of 2 to 6, and the other one having a carbon number of 8 to 22
And the other one is H or has 2 to 2 carbon atoms.
22 is an acyl group. ] And 12 to 22 carbon atoms
Is an ester of higher fatty acid and aliphatic polyhydric alcohol
A fat having at least one alcoholic hydroxyl group
Fatty acid ester (a ₂) 0.5 to 1 antifogging agent selected from
Crystalline propylene-based copolymer film containing 5% by weight
Laminated resin film characterized by laminating layers (B)
Is provided.

Of the saponified ethylene-vinyl acetate copolymer
Resin layer (A) The saponified ethylene-vinyl acetate copolymer resin of layer (A) that imparts gas barrier properties has an ethylene content of 25 to 25%.
It is preferably 50 mol% and the saponification degree is 90 mol% or more. Such an ethylene-vinyl acetate copolymer saponified product,
"Eval" (trade name) series E from Kuraray Co., Ltd.
PF 101, EP-H 101, EP-E 105
Are commercially available from Nippon Synthetic Chemical Industry Co., Ltd. under the grade names of D2908 and A4412 in the "Soarnol" (trade name) series.

Crystalline Propylene Copolymer Layer (B) Ethylene-Vinyl Acetate Copolymer Saponified resin (A) Layer laminated on one or both sides of the crystalline propylene copolymer copolymer for the surface layer (B). The coalesced is a copolymer of propylene and α-olefin such as ethylene, butene-1, hexene-1, octene-1, pentene-1, 4-methylpentene-1, 3-methylpentene-1. Among them, in order to improve the tackiness and the texture as a wrap film, in combination with ethylene 1 to 10% by weight, propylene 74 to 96% by weight, and α to olefin having 4 to 8 carbon atoms 3 to 25% by weight. Polymer is good.

Preferably, ethylene is 1.5 to 8% by weight, butene-1 is 8 to 17% by weight, and propylene is 75 to 7.
90.5 wt% random copolymer, melt flow rate (JIS P-7210; 230 ° C., 2.16 kg)
Load) 1 to 12 g / 10 minutes, Q value (Mw / Mn) 3.5 to 5, crystallinity 20 to 55% (X-ray method), more preferably 20 to 40% crystalline propylene-based Copolymer is good.

Such crystalline propylene-based copolymers are disclosed in JP-B-55-6643 and JP-A-50-79195.
No. 54,162,785, a mixture of ethylene, propylene and α-olefin is supplied to a polymerization system, and random copolymerization is carried out using a Ziegler-Natta catalyst. As the α-olefin, butene-1, pentene-1, hexene-1, heptene-1, octene-1, 4-methylpentene-1 can be used, and these can be used alone or in admixture of two or more.

As is well known, the Ziegler-Natta type catalyst basically comprises a combination of a transition metal compound component and a reducing metal compound component, and is well known including various modifiers thereof. As the transition metal compound component, compounds of transition metals of groups IV to VI of the periodic table can be generally used, and among them, titanium compounds are preferable.

Examples of the titanium compound include halides, oxyhalides, alkoxy compounds, and alkoxyhalides. Specific compounds include titanium halogen compounds such as titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium trichloride, titanium tribromide, titanium triiodide, titanium dichloride, etc. Used by preference. These can also be mixed and used.

A compound having a valence of less than the highest valence can be prepared by reducing the highest valence compound with hydrogen, a metal, an organometallic compound, a metal hydride, etc., depending on the reducing agent and / or the reducing method. Depending on the case, decomposition or modification compounds of reducing agents may coexist.
Such can also be used. In particular,
For example, T obtained by reducing metallic aluminum of titanium tetrachloride
There is iCl ₃ · 1 / 3AlCl ₃ .

Suitable reducing metal compound components are hydrides of metals of groups I to III of the periodic table and organometallic compounds. Particularly suitable compounds are aluminum hydrides and organoaluminum compounds of general formula (II) below.

[0022]

Embedded image AlR _n X _3-n (II)

Here, R is a hydrocarbon residue, especially 8 carbon atoms.
Less than or equal to alkyl, cycloalkyl, aryl groups, X
Is halogen and n is an integer of 1 to 3. Chlorine is suitable as the halogen, at least for economic reasons. Specific examples of such a aluminum compound include trialkylaluminum (alkyl = methyl to octyl), dialkylaluminum chloride, alkylaluminum sesquichloride, alkylaluminum dichloride. These can also be mixed and used.

The amount ratio of the transition metal compound component and the reducing metal compound component may be any that can be generally adopted in a Ziegler type catalyst. Specifically, for example, in the case of a combination of the titanium compound A and the organic aluminum compound B, the B / A molar ratio is about 0.5 to 20, preferably 1 to 10. It is known that the Ziegler type catalyst basically consisting of the above two components can be modified by various modifying agents.

One example of such a modifier is an electron donating compound. As the electron-donating compound, an acid anhydride,
Examples include esters, ketones, amines, glycols and glycol ethers. Specifically, it is, for example, methyl methacrylate. In carrying out the copolymerization, an inert organic solvent such as benzene, toluene, xylene, pentane,
Hexane, heptane, hydrocarbons such as cyclohexane, or in the presence or absence of halogenated hydrocarbons such as chlorobenzene and methylene chloride, or using a monomer for polymerization such as the α-olefin as a solvent, or in a gas phase. Arbitrary temperature, for example, temperature of about 0 to 200 ° C. (preferably 30 to 100 ° C.), and arbitrary pressure such as normal pressure to 100
It may be carried out at a pressure of about atmospheric pressure (preferably atmospheric pressure to 60 atmospheric pressure) with or without a molecular weight regulator such as hydrogen.

Such propylene / ethylene and butene-1
A crystalline propylene-based copolymer made of a copolymer is available from Mitsubishi Yuka Co., Ltd. as Mitsubishi Polypro "SPX4400""SP.
It is sold under the trade name of X4400G "by Sumitomo Chemical Co., Ltd. under the trade name of Sumitomo Noprene" FL6316 ". Propylene homopolymer has a low adhesiveness of the laminated resin film, and the rigidity is too high. The flexibility is impaired, and the fit with the packaged items is poor.

In the present invention, propylene / ethylene /
In the case of an α-olefin copolymer, when the propylene-based constitutional unit is less than 74% by weight, the resin obtained becomes rubber-like, making molding difficult and impairing the transparency of the film. On the contrary, when it exceeds 96% by weight, the expression of tackiness is insufficient, the rigidity is increased, and the flexibility is impaired. Further, when the content of the ethylene structural unit is less than 1% by weight, slurry polymerization of the propylene resin is difficult. When it exceeds 10% by weight, the crystallinity of the copolymer is impaired, the moldability and the transparency of the film are impaired. Further, the content of the constituent unit of the α-olefin having 4 to 8 carbon atoms in the propylene-based copolymer is 3
If it is less than 10% by weight, the tackiness is not sufficiently expressed and the effect of improving the flexibility of the film is small. On the other hand, if it exceeds 25% by weight, the transparency of the film is impaired.

When the Q value (Mw / Mn) of this crystalline propylene-based copolymer is less than 3.5, the film surface is smooth, but neck-in at the time of molding becomes large and molding becomes difficult. On the other hand, when it exceeds 5, the neck-in at the time of molding becomes small, but the film surface is not smooth and the adhesiveness is not sufficiently expressed.

The crystalline propylene-based copolymer of the layer (B) contains an ethylene-vinyl acetate copolymer (vinyl acetate content of 5 to 25% by weight), an ethylene-vinyl acetate copolymer within a range not impairing the transparency of the film. Acrylic acid copolymer (acrylic acid content 5-20 wt%), ethylene-methyl acrylate copolymer (methyl acrylate content 5-20 wt%), ethylene-methyl methacrylate copolymer, α-olefin And a metal salt of a copolymer composed of acrylic acid, methacrylic acid, maleic acid, etc. (Zn, Na, K, Li, Mg, etc.), a density of 0.890 to 0.910 g / cm ³ , and a melt index of 0.1. -10 g / 10 min low density polyethylene, linear low density polyethylene having a density of 0.886-0.920 g / cm ³ , maleic anhydride grafted ethylene-
A vinyl acetate copolymer, maleic anhydride-grafted polyethylene, maleic anhydride-grafted polypropylene, etc. may be added in an amount of 40% by weight or less for the purpose of improving the adhesiveness and flexibility of the laminated resin film. Alternatively, it may be laminated between the saponified ethylene-vinyl acetate copolymer resin film layer (A) and the crystalline propylene-based copolymer film layer (B). The crystalline propylene-based copolymer of the layer (B) of this laminated resin film has a glyceride represented by the following formula (I) in order to impart tackiness, antifogging property, flexibility and texture to the film. a ₁ )

[0030]

[Chemical 4]

[Wherein R¹, R²And R³One of them is charcoal
An acyl group having a prime number of 2 to 6, and the other one having a carbon number of 8 to 22
And the other one is H or has 2 to 2 carbon atoms.
22 is an acyl group. ] And 12 to 22 carbon atoms
Is an ester of higher fatty acid and aliphatic polyhydric alcohol
A fat having at least one alcoholic hydroxyl group
Fatty acid ester (a ₂) 0.5 to 1 antifogging agent selected from
5 wt% is included. The grease represented by the above formula (I)
Cerido (a₁), For example, diacetyl monoole
Ilglycerin, diacetylmonolaurylglycerin,
Diacetyl monopalmityl glycerin, monoacetyl di
Oleyl glycerin, monoacetyl dilauryl glycerin
, Monoacetyl monopalmityl glycerin, monoacetate
Chill monooleyl glycerin, monoacetyl monolauri
Luglycerin, monoacetyl monocaprylglycerin,
Monoacetyl brush dill glycerin, monopropyl mono
Brassil glycerin, monoacetyl mono-elucyl
Serine, dipropionyl monolauryl glycerin, etc.
Can be used.

Among these, it is more preferable that ^{two of} R ¹ , R ² and R ³ are acyl groups having 2 to 4 carbon atoms and the other one is an acyl group having 8 to 22 carbon atoms. The fatty acid ester (a ₂ ) is an ester compound of a polyhydric alcohol such as glycerin, sorbitol, pentaerythritol, propylene glycol, polyethylene glycol and polypropylene glycol, and a higher fatty acid such as oleic acid, linoleic acid and lauric acid. Specifically,
Monoglycerin oleate, polyglycerin oleate, polyglycerin stearate, polyglycerin polyricinoleate, glycerin mono, di-ricinoleate, glycerin acetyl ricinoleate, glycerin diacetomonolaurate, propylene glycol oleate, propylene glycol laurate, penta Erythritol oleate, polyethylene glycol oleate, polypropylene glycol oleate, sorbitan oleate, sorbitan laurate, polyethylene glycol sorbitan oleate, polyethylene glycol sorbitan laurate and the like can be used.

If the blending amount is less than 0.5% by weight, sufficient tackiness and flexibility cannot be obtained. On the contrary, if it exceeds 15% by weight, a large amount of bleeding deteriorates the appearance of the laminated resin film.
It is preferably 3 to 12% by weight. Moreover, you may mix | blend the above-mentioned additive with 0.5 to 15 weight% also to a (A) layer like a (B) layer. The resin layers (A) and (B) may contain 0.01 to 1% by weight of a commonly used nucleating agent such as silica powder and a stabilizer such as butylated hydroxytoluene.

Usually, the crystalline propylene-based copolymer and the saponified ethylene-vinyl acetate copolymer do not adhere to both layers even if they are co-extruded. However, the crystalline propylene-based copolymer described above is added to the crystalline propylene-based copolymer as in the present invention. By adding an antifogging agent, an interlaminar adhesive force can be obtained, and there is no practical problem in using it as a wrap film without providing an adhesive layer. However, an adhesive layer of maleic anhydride grafted polyethylene, ethylene / acrylic acid copolymer, or the like between the former ethylene-vinyl acetate copolymer saponified resin layer (A) and the crystalline propylene-based copolymer resin layer (B). May be interposed. Further, between the layer (A) of the saponified ethylene-vinyl acetate copolymer and the layer (B) of the crystalline propylene-based copolymer, poly-4-methylpentene- One resin film layer may be interposed.

Laminated Resin Film In the laminated resin film of the present invention, the thickness of the (A) layer is 1 to 1.
5 μm, preferably 2 to 5 μm, and the thickness of the (B) layer is 2 to
A laminated film having a thickness of 20 μm, preferably 2 to 6 μm, and a total thickness of 7 to 50 μm, preferably 8 to 22 μm, and a degree of haze (JIS-Z-6714) of 5% or less, preferably 3% or less. , Elmendorf tear strength (J
IS-Z-1702) has a longitudinal length of 1 to 150 kg / cm,
Preferably 2 to 50 kg / cm, lateral direction 1 to 150 kg
/ Cm, preferably 2 to 30 kg / cm.

The resin film layer (A) of saponified ethylene-vinyl acetate copolymer of the laminated resin film has a thickness of 1 μm.
If it is less than m, the gas barrier property is insufficient. 15 μm
Above that, the rigidity is increased and the flexibility is impaired. This laminated film is produced by inflation molding or T-die molding of the resin of the layers (A) and (B), optionally an adhesive layer, and a poly (4-methylpentene-1) film layer using a plurality of extruders. It is laminated and molded by a known method such as a coextrusion method or an extrusion laminating method. In the case of the inflation molding method, the blow ratio is preferably 1.5 to 20 times, preferably 2 to 16 times in order to obtain a film in which mechanical strength such as tear strength in the machine direction and the transverse direction are sufficiently balanced. . Moreover, in order to improve the cuttability of the film, this laminated resin film has 1.
2 to 5.0 times uniaxial stretching, or 3 to 4 in the longitudinal direction of the film.
It may be biaxially stretched 5 times and 6 to 10 times in the transverse direction.

[0037]

EXAMPLES The present invention will be described in detail with reference to Examples and Comparative Examples. These do not limit the invention in any way.

Example 1 Saponified ethylene-vinyl acetate copolymer [ethylene content 44 mol%, density 1.14 g / cc, melting point 165
C; manufactured by Kuraray Co., Ltd., trade name "Eval EP-E10"
5 "] (A), caliber 50 mm, screw diameter L / D
The mixture was kneaded using an extruder of No. 25 at 210 ° C. and led to the resin path of the intermediate layer of the three-layer T-die. On the other hand, propylene-ethylene random copolymer resin [propylene content 95.8% by weight, ethylene content 4.2% by weight, density 0.89 g / cm 2
³ , MFR 8g / 10min, melting point 140 ° C, crystallinity 35
%; Manufactured by Mitsubishi Petrochemical Co., Ltd., trade name "Mitsubishi Polypro FX
4 "] 94% by weight, and diglycerin oleate [manufactured by Riken Vitamin Co., Ltd., trade name" Rikemar O-71-D "] 6
The resin composition (B) consisting of the weight% has a diameter of 65 mm, L
/ D25 extruder at 250 [deg.] C., the mixture is fed to the resin paths of the upper and lower surface layers of the three-layer T-die and laminated in the T-die, and the intermediate layer 3 [mu] m and upper and lower surface layers 5 [mu] m Coextrusion so that the total thickness of the laminated film is 13 μm), and the laminated film is cooled with a cooling roll to give a width of 300
The film was slit into mm to obtain a three-layer film (B / A / B). The physical properties of this film are shown in Table 2.

Comparative Example 1 Table 2 shows the physical properties of a commercially available vinylidene chloride resin wrap film manufactured by K Company.

Comparative Example 2 Low density polyethylene resin [density 0.93 g / cm ³ , M
FR 3 g / 10 minutes, melting point 113 ° C .; manufactured by Mitsubishi Petrochemical Co., Ltd.
Product name "Mitsubishi Poly-LD ZH-51"] 98.5
Wt% and glycerin monooleate [RIKEN VITAMIN CO., LTD.
Made, product name "Rikemar OL-100"] 1.5% by weight
The resulting resin composition was kneaded at 180 ° C. using an extruder having a diameter of 65 mm and L / D25, and extruded with a T die so that the total thickness of the film was 13 μm. Slit to 300 mm to obtain a monolayer film.

Examples 2 to 5 and Comparative Examples 3 to 4 The resin for the intermediate layer and the surface layer having the composition shown in Table 1 was used, and the extrusion temperature was set under the conditions shown in the table. Film forming was performed in the same manner as in Example 1 except that the setting was made as shown in 2, to obtain a laminated resin film. Table 2 shows these physical properties. The abbreviations of the components in Table 1 and the evaluation methods in Table 2 are as follows.

Ethylene-vinyl acetate copolymer saponified product Eval EP-E 105; [Physical properties are described in Example 1; Kuraray Co., Ltd. trade name] Eval EP-H 101; [Ethylene content 38
mol%, density 1.17 g / cc, melting point 175 ° C .;
Kuraray Co., Ltd. product name]

Crystalline propylene resin Propylene / ethylene random copolymer FZ4; [Physical properties are described in Example 1; trade name of Mitsubishi Petrochemical Co., Ltd.] Propylene / ethylene / butene-1 random copolymer SPX 4400; Propylene content 88.7% by weight,
Ethylene content 2.4 wt%, butene-1 content 9.3 wt%, density 0.89 g / cm ³ , MFR 5 g / 10 min, Q
Value 4.5, crystallinity 35%; trade name of Mitsubishi Petrochemical Co., Ltd.] SPX 4400G; [Propylene content 85.8% by weight, ethylene content 1.7% by weight, butene-1 content 12.
5% by weight, density 0.89 g / cm ³ , MFR 5 g / 10
Min, Q value 4.8, crystallinity 30%; trade name of Mitsubishi Petrochemical Co., Ltd.] Propylene homopolymer FL-6CK; [Density 0.90 g / cm ³ , MFR 2.
3 g / 10 minutes, Q value 4.5, crystallinity 60%, trade name manufactured by Mitsubishi Petrochemical Co., Ltd.]

Low-density polyethylene resin ZH-51; [Physical properties described in Comparative Example 2; Mitsubishi Petrochemical Co., Ltd.
Product name]

Anti-fogging agent, antistatic agent Riquemar O-71-D; [diglycerin oleate;
Riken Vitamin Co., Ltd. product name] Rikemar O-250; [Sorbitan oleate; Riken Vitamin Co., Ltd. product name] Rikemar PL-004; -100; [glycerin monooleate; product name manufactured by Riken Vitamin Co., Ltd.]

Evaluation method Degree of haze JIS-Z-6714 (The smaller the value, the better the transparency.) Tear strength JIS-Z-1702 Self-adhesive force The films are overlapped with each other in an area of 1 cm in width and 2 cm in length, and a load is applied. After loading 20 kg on this overlapped portion for 2 minutes, this sample was pulled at a pulling speed of 50 with a Shopper type tensile tester.
Maximum load when peeled off at 0 mm / min.

Heat resistance 10 g at the lower end of a strip film having a width of 5 cm and a length of 20 cm
The film is hung in a constant temperature atmosphere for 1 hour under a load of, and the temperature until the film is cut is measured. (The higher it is, the more it can endure long-time heating by a microwave cooker.) Adhesiveness Adhesion to pottery when a ceramic dish is wrapped with a film ○: Good ×: Peeling off

Texture The presence or absence of sticky feeling and the rigidity of the film when touched with hands are evaluated by feeling. ◯: No stickiness and good flexibility. Δ: The slip is bad. X: Low waist strength. XX: The waist strength is too high. Cutability The cutability of the film with the saw blade attached to the wrap film box. ○: Good ×: Bad

Smell A ceramic dish containing 100 cc of warm corn soup was wrapped in a film, and after 0.5 hours, the presence or absence of odor on the film was visually evaluated. ◯: No smell x: Smell microwave oven characteristics A ceramic dish containing 100 cc of corn soup was wrapped in a film and heated in a microwave for 4 minutes. ○: No change △: Shrinking ×: Damaged delamination The film wound on the roll in the wrap film box is
When the film was pulled out by hand, the sample without delamination was evaluated as good (◯), and the sample with it was evaluated as bad (×).

[0050]

[Table 1]

[0051]

[Table 2]

[0052]

EFFECTS OF THE INVENTION The product of the present invention is a laminated resin film having excellent transparency, heat resistance, cuttability and texture, and also having excellent adhesiveness and gas barrier property. Food products are stored in this laminated resin film. Even if you wrap the pottery container and heat it in a microwave oven, there is no phenomenon such as melt fracture,
It can withstand use in a microwave oven.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location // C08K 5/10 C08L 23/10 KEQ

Claims (2)

[Claims] 1. Saponified ethylene-vinyl acetate copolymer
On one or both sides of the resin film layer (A) of
The glyceride represented by (I) (a₁) [Chemical 1][In the formula, R¹, R²And R³One of them has 2 to 6 carbon atoms
Acyl group, and the other one is an acyl group having 8 to 22 carbon atoms.
And the other one is H or acyl having 2 to 22 carbon atoms.
It is a base. ] And a higher fatty acid having 12 to 22 carbon atoms
And an ester of aliphatic polyhydric alcohol,
And fatty acid ester having one alcoholic hydroxyl group
(A ₂0.5 to 15% by weight of an antifogging agent selected from
The crystalline propylene-based copolymer film layer (B)
Layered laminated resin film. 2. The crystalline propylene-based copolymer of the layer (B) comprises 1 to 10% by weight of ethylene and 74 to 9 of propylene.
It is obtained by copolymerizing 6% by weight and 3 to 25% by weight of α-olefin having 4 to 8 carbon atoms, and has a melt flow rate (JIS P-7210; 230 ° C., 21.
The laminated resin film according to claim 1, which is a copolymer having a load of 6 kg) of 1 to 12 g / 10 min.