JPH06234196A - Laminated resin film - Google Patents

Abstract

PURPOSE:To obtain wrap film excellent in easiness of saw tooth cutting, self- adhesion and flexibility and free from melting and damage when heated in a microwave oven by laminating on a polyamide resin film a crystalline propylene resin film layer formed by copolymerizing ethylene, propylene and alpha-olefin having a specific number of carbon atoms. CONSTITUTION:On a polyamide resin film layer is laminated a crystalline propylene resin film layer formed by copolymerizing ethylene, propylene and alpha-olefin having 4-8 carbon atoms. The crystalline propylene resin film layer contains in an amount of 0.5-15wt.% an anti-fog agent selected from glyceride and the aliphatic ester obtained by esterifying a higher fatty acid having 12-22 carbon atoms and an aliphatic polyhydric alcohol and having at least one alcoholic hydroxide shown in the formula I wherein one of R<1>, R<2> and R<3> in a 2-6C acyl group, another one is a 8-22C acyl group, and the rest is H or a 2-22C acyl group.

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 and feeling.

[0002]

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

Here, food is wrapped by preventing food from drying (water scattering), flavor during storage, scattering of aroma, absorption of aroma and odor from other food, prevention of dust intrusion, and removal from tableware. This is to prevent food from jumping out.
Such a food packaging wrap film has a width of 20 to 45.
It is wound around a paper tube of about 20 to 100 m in cm and stored in a carton box made of paper, and is cut by a saw blade attached to the upper end of the side wall of the box as needed to be used.

The saw blade used for cutting the wrap film is generally a simple one obtained by cutting an iron plate of about 0.2 to 0.3 mm into a saw-tooth shape, or recently,
In any case, a very simple cutting mechanism such as a hard cardboard cut into a saw blade shape is employed. The following points are required for this wrap film.

The contents are transparent enough to be seen through. When pulling back from the carton box by hand, do not tear it into small pieces. Be self-adhesive. It must be heat resistant enough to prevent the film from melting when thawed in a microwave oven. Good tearability when cut with a saw blade. As a material for the wrap film, a biaxially stretched vinylidene chloride resin film, a polyvinyl chloride film, an ethylene resin film containing a surfactant (Japanese Patent Publication No. 38-4).
No. 174, No. 43-8606, and USP 4493867.
No. gazette) is used.

[0006] In recent years, due to global environmental problems, resin materials containing chlorine such as polyvinyl chloride and polyvinylidene chloride began to be suspected of being carcinogenic to these monomers, and plasticizer foods often used for soft vinyl chloride resin. There are many problems, such as food hygiene problems due to the shift to sewage, suspicion of dioxin generation during soil burial and incineration, and chlorine-based gas generated during incineration contributing to acid rain. It is contained.

In addition, when using a wrap film made of vinylidene chloride resin or polyvinyl chloride as a material, when a tear is made in a part of the film at the time of cutting, the tear spreads and spreads along the saw blade. There is a defect that it is cut diagonally without being cut. The wrapping film made of an ethylene resin, which has no problem during incineration, is easily stretched and is not easily torn. Therefore, a considerable tensile force is required at the time of cutting, the film cannot be cut well, or the carton box is deformed. In addition, there are problems such as poor heat resistance during thawing in a microwave oven, lack of adhesiveness to containers such as PSP trays, metal, and ceramics, and low stiffness of the film, making it difficult to handle. It cannot replace vinylidene resin and is used only in a part of the market.

For the purpose of improving the drawbacks of such vinylidene chloride resin film and polyvinyl chloride film, JP-A-3-175030 discloses a laminated film comprising at least three resin layers of an outer layer, an intermediate layer and an inner layer. The outer layer and the inner layer are (A) polypropylene resin 10
0 parts by weight, (B) polybutene or polyisobutylene 5 to
Glycerides 0.1 to 1 having 40 parts by weight and (C) an acyl group having 2 to 6 carbon atoms and an acyl group having 8 to 22 carbon atoms
0 parts by weight of the polypropylene resin composition, and the intermediate layer is composed of 100 parts by weight of the (D) aliphatic polyamide resin and 0 to 60 parts by weight of the (E) semi-aromatic polyamide. A polyamide resin laminated film characterized in that it has been proposed.

Further, in Japanese Patent Laid-Open No. 4-86259,
An outer layer and an inner layer each made of a polypropylene resin constitute both surface layers, and a multilayer film having an intermediate layer made of an aliphatic polyamide resin between the both surface layers. The film is obtained by coextrusion molding by a conventional inflation molding method, and then stretching in a take-up direction of the film at a draw ratio of 2 to 4.5 times, and the total thickness of the film is 40 μm or less, and
The thickness of the intermediate layer is 10 to 90% of the thickness of the entire film.
The packaging film of the present invention further has at least three layers of an outer layer, an intermediate layer and an inner layer in JP-A-4-249131, and the outer layer and the inner layer are (A) a polypropylene resin. 100 parts by weight, (B) polybutene or polyisobutylene 3 to 30 parts by weight and (C)
The polypropylene-based resin composition comprises 0.2 to 5 parts by weight of polyglycerin fatty acid ester, and the intermediate layer is
(D) A laminate film made of an aliphatic polyamide resin is obtained by stretching the film in the take-up direction at a stretch ratio of 2.0 to 4.5, and the total film thickness is 40 μm.
There has been proposed a packaging film having a thickness of m or less and a thickness of the intermediate layer in the range of 10 to 90% of the total thickness of the film.

The wrap film made of these polyamide / polypropylene laminated films has good heat resistance. However, since propylene homopolymer, propylene / ethylene random copolymer or propylene / ethylene block copolymer is used as polypropylene, when a wrap film having practically sufficient adhesive strength is obtained, It feels sticky and feels bad.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wrap film excellent in heat resistance and adhesive strength, which solves the above-mentioned problem of feeling in a food wrap film made of a polyamide / polypropylene laminated film. .

[0012]

MEANS FOR SOLVING THE PROBLEMS The present invention is a crystalline resin obtained by copolymerizing one side or both sides of a polyamide resin film layer (A) with ethylene, propylene and an α-olefin having 4 to 8 carbon atoms. A laminated resin film in which a resin film layer (B) of a propylene resin is laminated, wherein the layer (B) has a glyceride (a ₁ ) represented by the following formula (I):

[0013]

[Chemical 2]

[In the formula, ^one of R ¹ , R ² and R ³ is an acyl group having 2 to 6 carbon atoms, and the other is an acyl group having 8 to 2 carbon atoms.
2 is an acyl group, the other one is H or has 2 carbon atoms.
~ 22 acyl groups. ] And the carbon number is 12 to 2
2 is an ester of a higher fatty acid and an aliphatic polyhydric alcohol, and an antifog agent selected from fatty acid ester (a ₂ ) having at least one alcoholic hydroxyl group is 0.5 to
A laminated resin film containing 15% by weight is provided. [However, the amount of each component of the propylene-based resin in the layer (B) is 1 to 10% by weight of ethylene, 74 to 96% by weight of propylene, 3 to α-olefin.
It is 25% by weight. ]

Polyamide Resin Layer (A) As the polyamide of the material of the polyamide resin layer for imparting heat resistance, the density is 1.01 to 1.16 g / cm ³ , and the melting point is 165 to 260 ° C., preferably 220 to 260 ° C. , Heat distortion temperature (ASTM D-648; 4.6 kg / c
m ² ) is 85 to 250 ° C., preferably 135 to 230
℃, tensile elongation at break (ASTM D-638) is 250
% Or less is preferable. Specifically, nylon-6,
Nylon-6, 6, Nylon 6, 10, Nylon 11,
Nylon-12, nylon 6/6/6 copolymer, nylon 6/6/6 copolymer and the like can be mentioned.

Crystalline propylene-based resin layer (B) The crystalline propylene-based resin comprising the ethylene / propylene / α-olefin copolymer as the material of the resin layer (B) for imparting flexibility is 74 to 96% by weight of propylene. , A crystalline propylene resin containing 1 to 10% by weight of ethylene and 3 to 25% by weight of α-olefin as constituent components. Preferably, the copolymer has an ethylene content of 1.5 to 4% by weight, a butene-1 content of 8 to 20% by weight, and a propylene content of 90.5 to 76% by weight, and has a melt flow rate (JIS P-7).
210; 230 ° C, 2.16 kg load) is 1 to 12 g /
A propylene-based copolymer having a crystallinity of 20 to 55% (X-ray method) for 10 minutes, more preferably 20 to 40% is preferable.

Such a propylene-based copolymer contains ethylene in an amount of 0.5 to 12 so that it can be used in JP-B-55-6643, JP-A-50-79195 and JP-A-54-162785. % By weight, preferably 0.5-4.
0% by weight, 60 to 98.5% by weight of propylene, preferably 75 to 92% by weight, and 1.0 to 30 of α-olefin.
It is produced by supplying the polymerization system at a ratio of 5% by weight, preferably 5 to 20% by weight, and carrying out random copolymerization 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 consists of a combination of a transition metal compound component and a reducing metal compound component, and is well known including various modifiers thereof.

As a transition metal compound component, the periodic table IV
Compounds of Group VI transition metals are generally available, of which the titanium compounds are preferred. Examples of the titanium compound include halides, oxyhalides, alkoxy compounds, alkoxyhalides and the like. Specific compounds include titanium halogen compounds such as titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, titanium trichloride, titanium tribromide, titanium triiodide and titanium dichloride,
In particular, titanium trichloride is preferably used. 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, there is TiCl ₃ .1 / 3AlCl ₃ obtained by reducing titanium tetrachloride to aluminum metal.

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 AlRnX _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 3, 2, 1, 5 or 1. Chlorine is suitable as the halogen, at least for economic reasons.

Specific examples of such an aluminum compound include trialkylaluminum (alkyl = methyl to octyl, especially lower alkyl (about C ₄ or less)), dialkylaluminum chloride, alkylaluminum sesquichloride, alkylaluminum dichloride and the like. . These can also be mixed and used. The ratio of these transition metal compound component and reducing metal compound component may be any amount that can be generally adopted in a Ziegler type catalyst. Specifically, for example, in the case of the combination of the titanium compound A and the organoaluminum compound B, B / A
The molar ratio is about 0.5 to 20, preferably 1 to 10.

It is known that the Ziegler type catalyst which basically consists of the above two components can be modified by various modifying agents. One example of such modifiability is an electron donating compound. Examples of electron-donating compounds include acid anhydrides, esters, ketones, amines, glycols and glycol ethers. Specifically, it is, for example, methyl methacrylate.

In carrying out the copolymerization, an inert organic solvent,
For example, in the presence or absence of hydrocarbons such as benzene, toluene, xylene, pentane, hexane, heptane, and cyclohexane, and halogenated hydrocarbons such as chlorobenzene and methylene chloride, or a monomer for polymerization of the above α-olefins. The body is used as a solvent or in a gas phase at any temperature, for example, a temperature of about 0 to 200 ° C. (preferably 30)
˜100 ° C.) and an arbitrary pressure such as a pressure of about atmospheric pressure to 100 atm (preferably atmospheric pressure to 60 atm) with or without a molecular weight regulator such as hydrogen.

Such crystalline propylene resin is available from Mitsubishi Yuka Co., Ltd. as Mitsubishi Polypro "SPX4400", SP
It is sold under the trade name of X1796 by Sumitomo Chemical Co., Ltd. under the trade name of Sumitomo Noblen FL6316. In the case of propylene homopolymer, the rigidity of the laminated resin film becomes too high, the flexibility is impaired, and the fitting property with respect to the enclosed items is poor. Propylene / ethylene (1.5-6% by weight)
In the case of the random copolymer, the rigidity is slightly lowered, but the effect of improving the flexibility is not sufficient.

In the present invention, if the propylene-based constitutional unit of the propylene resin is less than 74% by weight, the resin obtained becomes rubber-like, making molding difficult and impairing the transparency of the film. On the other hand, if it exceeds 96% by weight, 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, if the content of the α-olefin structural unit in the propylene resin is less than 3% by weight, the effect of improving the flexibility of the film is small, and if it exceeds 25% by weight, the transparency of the film is impaired.

This propylene resin is a transparent film.
Ethylene-vinyl acetate (vinyl acetate
5-25% by weight), ethylene / acrylic acid (activator
The phosphoric acid content is 5 to 20% by weight)
Methyl acrylate copolymer (methyl acrylate content of 5
20% by weight), ethylene-methyl methacrylate copolymerization
Body, density 0.890-0.910 g / cm³, Melt
Low density polyethylene with an index of 0.1-10g / 10min
Tilene, density 0.886-0.920 g / cm ³Line of
Low density polyethylene, maleic anhydride grafted ethylene
-Vinyl acetate copolymer, maleic anhydride grafted poly
Ethylene, maleic anhydride grafted polypropylene, etc.
For the purpose of improving the flexibility and self-adhesiveness of laminated resin films
40% by weight or less, preferably 20% by weight or less
Good.

The antifogging agent self-adhesive of the layer (B) laminated resin film in the laminated resin film, anti-fogging, flexibility, in both layers in order to improve the feeling, by the following formula (I) The glyceride shown (a ₁ )

[0031]

[Chemical 4]

[Wherein ^one of R ¹ , R ² and R ³ is an acyl group having 2 to 6 carbon atoms, and the other is an acyl group having 8 to 2 carbon atoms]
2 is an acyl group, the other one is H or has 2 carbon atoms.
~ 22 acyl groups. ] And the carbon number is 12 to 2
2 is an ester of a higher fatty acid and an aliphatic polyhydric alcohol, and an antifog agent selected from fatty acid ester (a ₂ ) having at least one alcoholic hydroxyl group is 0.5 to
15% by weight is contained.

Examples of the glyceride (a ₁ ) represented by the above formula (I) include diacetyl monooleyl glycerin, diacetyl monolauryl glycerin, diacetyl monopalmityl glycerin, monoacetyl dioleyl glycerin, monoacetyl dilauryl glycerin, Monoacetyl monopalmityl glycerin, monoacetyl monooleyl glycerin, monoacetyl monolauryl glycerin, monoacetyl monocapryl glycerin, monoacetyl brushyl glycerin, monopropyl monobrassil glycerin, monoacetyl monoerucyl glycerin, dipropionyl monolauryl glycerin Etc. are available.

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, glycerin mono, di-ricinoleate, glycerin acetyl ricinoleate, propylene glycol oleate, propylene glycol laurate, pentaerythritol 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.

When the content is less than 0.5% by weight, sufficient flexibility and tackiness cannot be obtained, while when 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. Further, in the same manner as in the layer (B), the layer (A) contains 0.5 to 15% by weight of the antifogging agent.
It may be contained. The resin layers (A) and (B) may further contain 0.01 to 1% by weight of a nucleating agent such as silica powder and a stabilizer such as butylated hydroxytoluene.

Laminated Resin Film The laminated resin film of the present invention has a wall thickness of (A) of 1 to 10 μm and (B) for use as a film for wrap packaging.
The layer thickness is 2 to 20 μm (however, when the B layer is on both sides, the total thickness of the B layer is 4 to 20 μm). ] And the overall thickness is 7 to 25 microns, and the degree of haze (JIS-Z-6714) is 5% or less,
Elmendorf tear strength (JIS-Z-1702) is 2 to 100 kg / cm in the longitudinal direction and 2 to 150 kg / c in the lateral direction.
It is preferably m. When the thickness of the polyamide resin film layer (A) of the laminated resin film is less than 1 micron,
Insufficient heat resistance when heated by microwave oven. 10
Beyond micron, the rigidity of the laminated resin film increases and the flexibility is impaired.

Manufacture of Laminated Resin Film This laminated film can be formed by a coextrusion method of the polyamide of the (A) layer and the propylene resin of the (B) layer. Specifically, the molten resin for the (A) layer and the (B) layer melt-kneaded by separate extruders is supplied to one multi-layer coextrusion die, or a lamination system including a combination of a multi-layer feed block and a die. Is a co-extrusion through a die, and a co-extruded laminated resin film is cooled to be molded, and a T-die film molding method or an inflation film molding method is available. The blow ratio (BUR) in the blown film molding method is 1.5 to 20 times, preferably 2 to 16 times.
Double. In addition, this laminated resin film has a 1.
It may be uniaxially stretched by 2 to 5.0 times, or biaxially stretched by 2 to 12 times in the machine and transverse directions of the film.

[0038]

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 Nylon 66, "Ultramid A A5" manufactured by BASF Engineering Plastics Co., Ltd. [trade name; density 1.13 g / cm ³ , melting point 260 ° C., elongation at break 200]
%] (A) was melt-kneaded at 295 ° C. using an extruder having a diameter of 50 mm and an L / D of 25, and was introduced into the intermediate layer of a three-layer T-die. Propylene (88.
7% by weight) / Ethylene (2.4% by weight) / Butene-1
(9.3% by weight) Random copolymer "Mitsubishi Polypro SP
X4400 "[trade name; density 0.896 g / cm ³ , M
FR 5.0 g / 10 min, crystallinity 35%] 94% by weight and a resin composition (B) comprising 6 parts by weight of polyglycerin oleic acid ester "Rikemar O-71D" (trade name) of Riken Vitamin Co., Ltd. , Caliber 65mm, L / D 25
Melt-kneaded at 250 ° C. using an extruder of No. 3, and supplied to the upper and lower surface layers of the above-mentioned three-layer T-die, the intermediate layer 3.6 μm, the upper and lower surface layers 4.7 μm each, and the total film thickness 13 μm.
Co-extruded to be m, cooled with a chill roll, width 300
Slit to mm to obtain a three-layer film (B / A / B). The physical properties of this film are shown in Table 2.

Comparative Example 1 Low density polyethylene "Mitsubishi Polyethylene" manufactured by Mitsubishi Petrochemical Co., Ltd.
LDZH-51 "(trade name; MFR 2.8g / 10
Min, density 0.925 g / cm ³ ] 98.5% by weight and a mixture of Riken Vitamin Co., Ltd.'s monoglycerine oleate “Rikemar OL100” 1.5% by weight, with a caliber of 65
mm, L / D of 25, melt-kneaded at 180 ° C., co-extruded with T-die to a total film thickness of 13 μm, cooled with a cooling roll, and slit into a width of 300 mm. A layer film was obtained. The physical properties are shown in Table 2.

Reference Example 1 Table 2 shows the physical properties of a commercially available vinylidene chloride resin wrap film manufactured by K Company. Examples 2 to 8 and Comparative Examples 2 to 4 The resin having the composition shown in Table 1 was used as the resin for the intermediate layer and the front and back layers,
A film was formed in the same manner as in Example 1 except that the extrusion temperature was set under the conditions shown in the table and the thickness constitution was set as shown in Table 2 to obtain a laminated resin film. The physical properties are shown in Table 2.

Example 9 Nylon 66 of BASF Engineering Plastics Co., Ltd., "Ultramid A A5" (trade name) 97% by weight, and glycerin diacetyl monolaurate "Rikemar PL004" (trade name) 3 of Riken Vitamin Co., Ltd. The mixture (A) with the weight% has a caliber of 50 mm and an L / D of 25.
A film was formed in the same manner as in Example 1 except that melt kneading was performed at 295 ° C. using the extruder of
A laminated resin film having the physical properties shown in Table 2 was obtained.

The abbreviations of the components in Tables 1 and 2 are as follows. Polyamide: Ultramid A (PA66) A5; [manufactured by BASF Engineering Plastics Co., Ltd .; physical properties are described in Example 1] Ultramid C (copolymerized PA 6/66) C35;
[Manufactured by BASF Engineering Plastics Co., Ltd .; density 1.13 g / cm ³ , melting point 196 ° C., elongation at break 25
0%] Ultramid B (PA6) B4K; [manufactured by BASF Engineering Plastics Co., Ltd .; density 1.13 g / c
m ³ , melting point 220 ° C., elongation at break 200%] Daiamide (PA12) L1901; [manufactured by Daicel Hüls Ltd .; density 1.01 g / cm ³ , melting point 178
C., elongation at break 250%] Propylene-based resin; Propylene-ethylene-butene-1 random copolymer SPX4400; [Mitsubishi Yuka Co., Ltd .;
SPX1796; manufactured by Mitsubishi Petrochemical Co., Ltd .; propylene content 85.8% by weight, ethylene content 1.7% by weight, butene-
1 content 12.5% by weight, MFR 5 g / 10 minutes, crystallinity 30%] Propylene / ethylene random copolymer FX4; [Mitsubishi Yuka Co., Ltd. propylene / ethylene (ethylene content 4.2% by weight) Polymer; MFR 9g / 10
Min, crystallinity 35%] Propylene homopolymer FB3; [Mitsubishi Yuka Co., Ltd., MFR 2.5 g / 10
Min, crystallinity 64%] Low-density polyethylene: ZH-51; [Mitsubishi Yuka Co., Ltd., physical properties are described in Comparative Example 1] Polybutene: HV35; [Nippon Petrochemicals Co.] PB8640; Product] Additive: O71D; [Polyglycerin oleic acid ester manufactured by Riken Vitamin Co., Ltd.] PL002; [Diacetylmonolaurylglycerin manufactured by Riken Vitamin Co., Ltd.] PL004; [Deodorized product of the above product] O250; [Riken Vitamin Co., Ltd.] ) Sorbitan mono, dioleate] OL100; [Riken Vitamin Co., Ltd. monoglycerin oleate] L250A; [Riken Vitamin Co., sorbitan laurate] Direction: TD (horizontal), MD (vertical)

Evaluation method Heat resistance: A strip film having a width of 5 cm and a length of 20 cm is attached with a weight of 10 g on the lower end thereof and hung in a constant temperature atmosphere for 1 hour, and the temperature until the film is cut is measured. (The higher it is, the more it can withstand heating by a microwave oven.) Adhesive force: Films are stacked in an area having a width of 1 cm and a length of 2 cm, and a load of 20 kg is hung on the overlapping portion for 2 minutes, and then the sample is a shopper type. Tensile speed is 500 with a tensile tester
Maximum load when peeled off at mm / min. Feeling: The presence or absence of stickiness and the rigidity of the film when touched with the hands are evaluated visually. Evaluation criteria ◯: No stickiness and good flexibility. Δ ^* : Sticky. △ ^** : Low waist strength. Adhesiveness: Adhesion to ceramics when a ceramics dish is wrapped with a film Evaluation criteria ○: Good ×: Peeling

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Application] When a ceramic dish containing 200 cc of stew was wrapped with the laminated resin film obtained in Example 1 and Comparative Example 1, and the stew was warmed by heating in a microwave oven for 3 minutes. No breakage was observed, and peeling from the ceramic dish was easy, but that in Comparative Example 1 was melt fractured, and peeling from the ceramic dish was also fused and it was difficult.

[0047]

Industrial Applicability The product of the present invention has transparency, heat resistance, adhesiveness,
It is excellent in feeling, and even if you wrap a ceramic container containing food with this laminated resin film and heat it in a microwave oven, there is no phenomenon such as melt fracture, it is sufficient for use in a microwave oven. It bears.

Front Page Continuation (72) Inventor Mie Toyoda, Toho-cho, Yokkaichi-shi, Mie Prefecture Yokkaichi Research Institute, Mitsubishi Petrochemical Co., Ltd.

Claims (2)

[Claims] 1. A resin film layer of a crystalline propylene resin obtained by copolymerizing ethylene, propylene and an α-olefin having 4 to 8 carbon atoms on one or both sides of the polyamide resin film layer (A) ( A laminated resin film in which B) is laminated, wherein the layer (B) has a glyceride (a ₁ ) represented by the following formula (I): [In the formula, ^one of R ¹ , R ² and R ³ has 2 to 6 carbon atoms.
And the other one is an acyl group having 8 to 22 carbon atoms, and the other one is H or an acyl group having 2 to 22 carbon atoms. ] And an antifogging agent selected from a fatty acid ester (a ₂ ) having 12 to 22 carbon atoms and an aliphatic polyhydric alcohol and having at least one alcoholic hydroxyl group. 5 to 15% by weight of a laminated resin film (provided that the amount of each component of the propylene resin in the layer (B) is 1 to 10% by weight of ethylene, 74 to 96% by weight of propylene, α-
The olefin is 3 to 25% by weight. ]. 2. The thickness of the layer (A) is 1 to 10 μm,
The thickness of the (B) layer is 2 to 20 microns (however, when the B layer is on both sides, the total thickness of the B layer is 4 to 20 microns. ] And the overall thickness is 7 to 25 microns, and the degree of haze (JIS-Z-6714) is 5
% Or less, Elmendorf tear strength (JIS-Z-170
2) is 2 to 100 kg / cm in the vertical direction and 2 to 150 in the horizontal direction
The laminated resin film according to claim 1, which is kg / cm.