JP6331584B2 - Resin composition and food packaging film - Google Patents

Description

  The present invention relates to a resin composition excellent in antifogging property, transparency, and heat sealability, and a food packaging film.

  With the expansion of the market and the diversification of consumer needs, food packaging containers are required to have various characteristics such as transparency that allows the contents to be visually confirmed during storage, oxygen / water vapor barrier properties, and impact resistance. In particular, the required level of anti-fogging properties against water droplets adhering to the inner surface of the container when it is packaged with moisture and heated with a microwave oven or boil, or condensation on the inner surface of the container when refrigerated is stored. It is expensive.

  The bottom material of these food packaging containers is generally a tray container mainly made of polyolefin, polyester or the like from the viewpoint of food quality control. When the food is stored in the bottom material and sealed, the film used as the container lid is provided with a heat sealable sealant layer.

  That is, food is stored in a tray container, which is the bottom material of the packaging container, and a lid film is applied, and then the lid or chin of the tray container is subjected to a retort process that heat-seals the film to seal and protect the food Thus, it can be stored for a long time.

  In this case, the lid film having the sealant layer is required to have high sealing performance and anti-fogging property, but is also easily opened (easy peel) since it is finally opened by the consumer. It is hoped that.

Various proposals have been made so far for food packaging films having such a sealant layer.
For example, in Patent Document 1, a resin composition composed of an olefinic thermoplastic elastomer is used as a core layer (intermediate layer), and at least one surface thereof is added with linear low density polyethylene, low density polyethylene, and polyoxyethylene sorbitan fatty acid ester. A stretch film for food packaging obtained by blending is disclosed, and is said to be excellent in antifogging property, film reversal property, film slipperiness, transparency, cold resistance, and heat sealability.

  Patent Document 2 discloses an easy-open coextruded film composed of a heat-resistant ethylene-vinyl acetate copolymer saponified product (hrEVOH) resin layer, a polyamide resin layer, and various polyolefin resin layers, and has an oxygen barrier property. It is said to be excellent in easy peel, heat resistance and transparency.

  Patent Document 3 is in contact with an article to be packaged of a film layer formed of a resin composition comprising a polyolefin-based resin, a partial ester compound of an aliphatic polyhydric alcohol and an aliphatic monocarboxylic acid, or an alkali metal salt. A laminated film for packaging formed by applying a partial ester compound of an aliphatic polyhydric alcohol and an aliphatic monocarboxylic acid, or alkyldiethanolamine on the surface to be transparent, antifogging, slippery, It is said to be excellent in heat sealability.

JP 2004-209696 A JP 2006-281675 A JP 2007-290338 A

  As represented by the film disclosed in the above patent document, a resin composition in which an antifogging agent is blended with a polyolefin or an olefin copolymer is mainly used for a sealant layer of a food packaging film. However, not only polyolefin but also polyester, for example, is used as the bottom material of the food packaging container described above, and the heat seal strength is not sufficient depending on the adherend in the conventional polyolefin-based sealant layer. It was desired.

  Therefore, the present invention comprises a resin composition that contributes to the formation of a sealant layer that is excellent in antifogging properties and transparency, and that is excellent in heat sealability regardless of the material of the bottom of the food packaging container, and the resin composition. It aims at providing the food packaging film which has a layer in at least one outermost layer.

As a result of intensive studies in view of the above problems, the present inventor has found that a resin containing a plurality of specific compounds acting as an antifogging agent in an amount within a predetermined range with respect to an ethylene- (meth) acrylate ester copolymer. A food packaging film having a composition and a layer comprising the resin composition in at least one outermost layer is excellent in low-temperature antifogging property, high-temperature antifogging property and transparency, and is related to the material of a food packaging container bottom material As a result, the present invention was completed.
That is, the present invention is as follows.

[1] A resin composition containing an ethylene- (meth) acrylic acid ester copolymer as a main component, wherein the monoglycerin fatty acid ester is added in an amount of 0.1 to 100 parts by mass of the ethylene- (meth) acrylic acid ester copolymer. 3 parts by mass or more and 1.0 part by mass or less, and further 0.1 parts by mass or more and 1.0 part by mass or less of ethylene oxide adduct and / or 0.1 parts by mass or more of polyglycerol fatty acid ester A resin composition containing 1.0 part by mass or less , and having a crystal melting peak temperature Tm of the ethylene- (meth) acrylic ester copolymer of 80 ° C. or higher and 110 ° C. or lower .
[2] The resin composition according to [1], wherein the ethylene content of the ethylene- (meth) acrylic acid ester copolymer is 80% by mole to 99% by mole.
[3] The resin composition according to [1] or [2], wherein the ethylene- (meth) acrylic acid ester copolymer is an ethylene-methyl methacrylate copolymer.
[4] The resin composition according to any one of [1] to [3], wherein the monoglycerin fatty acid ester is a monoester or diester of glycerin and a saturated fatty acid having 12 to 20 carbon atoms.
[5] The resin composition according to any one of [1] to [4], wherein the ethylene oxide adduct is a polyoxyethylene alkyl ether having an ethylene oxide addition number of 1 to 10 mol.
[6] A food packaging film having a layer made of the resin composition according to any one of [1] to [5] in at least one outermost layer.

  The resin composition of the present invention is excellent in low-temperature antifogging property, high-temperature antifogging property, and transparency, and contributes to the formation of a sealant layer excellent in heat sealability regardless of the material of the bottom of the food packaging container. And the food packaging film which has the layer which consists of this resin composition in at least one outermost layer can be utilized suitably as a lid | cover material etc. of a food packaging container.

  Hereinafter, a resin composition (hereinafter also referred to as “the present resin composition”) as an example of an embodiment of the present invention, and a food packaging film (hereinafter referred to as “the present film”) having a layer made of the resin composition in at least one outermost layer. Will also be described. However, the scope of the present invention is not limited to the embodiments described below.

<Ethylene- (meth) acrylic ester copolymer>
This resin composition has an ethylene- (meth) acrylic acid ester copolymer as a main component. Here, the “main component” refers to a component occupying the largest content ratio among the components constituting the resin composition, and is preferably 50% by mass or more, and 70% by mass or more in the present invention. Is more preferable, and it is especially preferable that it is 90 mass% or more.

  By using ethylene- (meth) acrylic acid ester copolymer as a main component, this film is preferable because it exhibits heat-sealability with respect to food packaging container bottom materials other than polyolefin, such as polyester. . Further, it is preferable because it is excellent in transparency and thermal stability, and is less likely to be decomposed by heating to generate a volatile component.

In the ethylene- (meth) acrylic acid ester copolymer used in the present invention, “(meth) acrylic acid ester” copolymerized with ethylene is an ester of acrylic acid and a monohydric alcohol, or methacrylic acid and a monohydric alcohol. Any of esters may be used.
Specific examples include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, and isobutyl methacrylate. It is not limited to these.

  Among these, methyl acrylate, ethyl acrylate, butyl acrylate, or methyl methacrylate is preferable from the viewpoint of transparency, heat stability, and heat sealability, and methyl methacrylate is particularly preferable. That is, the ethylene- (meth) acrylic acid ester copolymer used in the present invention is particularly preferably an ethylene-methyl methacrylate copolymer.

The ethylene content of the ethylene- (meth) acrylic acid ester copolymer used in the present invention is preferably 80 mol% or more and 99 mol% or less, and more preferably 85 mol% or more and 95 mol% or less. preferable.
An ethylene content of 80 mol% or more is preferable because it has heat resistance and impact resistance. In addition, an ethylene content of 99 mol% or less is preferable because it has adhesiveness with an acrylic ester.

The crystal melting peak temperature Tm of the ethylene- (meth) acrylic acid ester copolymer used in the present invention measured at a heating rate of 10 ° C./min in differential scanning calorimetry based on JIS K7121 (2012) is 80 ° C. As described above, it is preferably 110 ° C. or lower, more preferably 85 ° C. or higher and 105 ° C. or lower.
A crystal melting peak temperature Tm of 80 ° C. or higher is preferred because it has heat resistance. Moreover, it is preferable if the crystal melting peak temperature Tm is 110 ° C. or lower because of excellent heat sealability.

  The ethylene- (meth) acrylic acid ester copolymers available on the market include the trade name “ACRIFT” manufactured by Sumitomo Chemical Co., Ltd. and the product name “ELVALOY AC” manufactured by Mitsui DuPont Polychemical Co., Ltd. The product name “Horodyne” manufactured by Yashara Chemical Co., Ltd. can be used.

<Monoglycerin fatty acid ester>
It is important that the resin composition contains a monoglycerin fatty acid ester. By containing a monoglycerin fatty acid ester, the antifogging property of the film, particularly the high temperature antifogging property described later, is preferable.

Although it does not specifically limit as monoglycerin fatty acid ester used for this invention, Especially, it is the said ethylene- (meth) acrylic acid ester copolyester to use the monoester or diester of glycerin and a C12-C20 saturated fatty acid. From the viewpoints of compatibility with the coalescence, antifogging properties and transparency of the film.
Among these, monoesters of glycerin and saturated fatty acids having 12 to 20 carbon atoms are preferable, glycerin monolaurate, glycerin monopalmitate, and glycerin monostearate are more preferable, and glycerin monostearate is antifogging at high temperature. And particularly preferred from the viewpoint of anti-fogging stability over time.

It is important that the monoglycerin fatty acid ester in the resin composition is contained in an amount of 0.3 parts by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the ethylene- (meth) acrylate copolymer. More preferably, the content is 0.4 parts by mass or more and 1.0 part by mass or less.
Containing 0.3 part by mass or more of monoglycerin fatty acid ester is preferable because the antifogging property of the film, particularly the high temperature antifogging property described later, is improved. On the other hand, the monoglycerin fatty acid ester is preferably contained in an amount of 1.0 part by mass or less because the risk of bleeding out of the monoglycerin fatty acid ester to the surface of the film is small and the heat sealability of the film is improved.

<Ethylene oxide adduct and / or polyglycerol fatty acid ester>
It is important that the resin composition further contains an ethylene oxide adduct and / or a polyglycerol fatty acid ester.
In addition to the monoglycerin fatty acid ester, an ethylene oxide adduct and / or a polyglycerin fatty acid ester are used in combination in a predetermined amount as an essential component. It is preferable because it is excellent in anti-fogging stability over time and heat sealability.

The ethylene oxide adduct used in the present invention is not particularly limited, and examples thereof include polyoxyethylene alkyl esters and polyoxyethylene alkyl ethers. Among them, polyoxyethylene alkyl ether having an ethylene oxide addition number of 1 to 10 mol is used. Is preferable from the viewpoints of compatibility with the ethylene- (meth) acrylic acid ester copolymer, improvement of antifogging properties and transparency of the film. If the number of addition of ethylene oxide is 1 mol or more, it is preferable from the viewpoint of antifogging property (hydrophilicity), and if it is 10 mol or less, polyolefin, polyester or the like is mainly preferable from the viewpoint of heat sealability with the substrate.
Specific examples include polyoxyethylene glycerol monostearate, polyoxyethylene monolauryl ether, polyoxyethylene sorbitan oleate and the like, and among them, polyoxyethylene monolauryl ether is particularly preferable.

  Examples of the polyglycerin fatty acid ester used in the present invention include polyglycerin stearate, polyglycerin laurate, polyglycerin oleate, decaglycerin stearate, decaglycerin laurate, and among them, decaglycerin oleate is particularly preferable.

When the ethylene oxide adduct is contained in the resin composition, the content is 0.1 parts by mass or more and 1.0 part by mass or less with respect to 100 parts by mass of the ethylene- (meth) acrylic acid ester copolymer. It is important that the content is 0.2 parts by mass or more and 1.0 part by mass or less.
It is preferable to contain 0.1 part by mass or more of an ethylene oxide adduct because the antifogging property of the film, particularly the low temperature antifogging property described later, is improved. On the other hand, the ethylene oxide adduct is preferably contained in an amount of 1.0 part by mass or less because the possibility of bleeding out of the ethylene oxide adduct onto the film surface is small and the transparency and heat sealability of the film are improved.

Content in case this resin composition contains polyglyceryl fatty acid ester contains 0.1 mass part or more and 1.0 mass part or less with respect to 100 mass parts of ethylene- (meth) acrylic acid ester copolymers. It is important that the content is 0.2 parts by mass or more and 1.0 part by mass or less.
Containing 0.1 part by mass or more of polyglycerin fatty acid ester is preferable because the antifogging property of the film, particularly the low-temperature antifogging property described later, is improved. On the other hand, the polyglycerin fatty acid ester is preferably contained in an amount of 1.0 part by mass or less because the risk of bleeding out of the polyglycerin fatty acid ester to the film surface is small and the transparency and heat sealability of the film are improved.

(Other anti-fogging agents)
In the range which does not impair the effect of this invention, in this resin composition, you may contain other anti-fogging agents other than said monoglycerin fatty acid ester, ethylene oxide adduct, and polyglycerin fatty acid ester.
Examples of other antifogging agents include sorbitotan fatty acid esters.

In the present resin composition, the total content of the antifogging agent including the monoglycerin fatty acid ester, the ethylene oxide adduct, and the polyglycerin fatty acid ester is 0.5% by mass or more based on the entire resin composition. The content is preferably 0% by mass or less, and more preferably 0.5% by mass or more and 1.5% by mass or less.
It is preferable that the total content of the antifogging agent is 0.5% by mass or more because the antifogging property of the film is improved. On the other hand, it is preferable that the total content of the antifogging agent is 2.0% by mass or less because the risk of bleeding out of the antifogging agent to the film surface is small and the transparency and heat sealability of the film are improved.

<Other ingredients>
In addition to the ethylene- (meth) acrylic acid ester copolymer and the antifogging agent, the resin composition contains other resins and additives as necessary within a range not impairing the effects of the present invention. be able to.
Examples of other resins include polyolefin resins, particularly polyethylene resins and acrylic resins, from the viewpoint of maintaining the transparency and heat sealability of the film. Examples of the additive include inorganic fillers, organic fillers, ultraviolet absorbers, light stabilizers, antioxidants, lubricants, hydrolysis inhibitors, antistatic agents, and plasticizers.

<Food packaging film>
This film is a food packaging film having a layer composed of the present resin composition in at least one outermost layer. That is, when the layer which consists of this resin composition in this film plays a role as a sealant layer, this film will have the outstanding anti-fogging property, transparency, and heat seal property.

If this film has the layer which consists of this resin composition in at least one outermost layer, the structure will not be specifically limited.
For example, it may be a film consisting only of a layer comprising the resin composition, but in view of various required characteristics such as handling properties during production and transportation, oxygen / water vapor barrier properties and impact resistance in food packaging applications, In addition to the composition layer, the food packaging film has various resin layers such as polyolefin resin layers, polyester resin layers, polyamide resin layers, adhesive layers, vapor deposition layers, printing layers, antistatic layers, etc. Can do.

  It does not specifically limit as a manufacturing method of this film. For example, the layer composed of the present resin composition and the various resin layers and the adhesive layer may be manufactured by lamination by coextrusion using an extrusion method using a T-die or an inflation method, and each layer is a single layer. After manufacturing as a film, it may be laminated and laminated. Moreover, an adhesive layer, an antistatic layer, a vapor deposition layer, a printing layer, etc. can be provided as needed on the surface of various resin layers by a known coating method, vapor deposition method or printing method.

The thickness of the layer made of the resin composition in the film is preferably 10 μm or more and 30 μm or less, more preferably 15 μm or more and 25 μm or less.
By setting the thickness of the layer made of the resin composition to 10 μm or more, when the present film is used as a lid for a food packaging container, it is preferable because good heat sealability is exhibited. Moreover, by making the thickness of the layer made of the resin composition 30 μm or less, it is possible to make it difficult to generate fuzz and resin residue when the film is peeled from the bottom material of the food packaging container, and a good peeling appearance. Is preferable.
In addition, about the total thickness of this film, it does not restrict | limit in particular, It determines by setting suitably the thickness of other layers other than the layer which consists of this resin composition according to the use.

  As described above, this film is a film excellent in antifogging properties, and more specifically, a film excellent in both high temperature antifogging properties and low temperature antifogging properties. The inventor of the present invention has added a monoglycerin fatty acid ester, an ethylene oxide adduct and / or a polyglycerin fatty acid ester in a predetermined amount to the ethylene- (meth) acrylic acid ester copolymer, respectively. It was found that such an effect that could not be achieved with this film was exhibited.

  In this film, hot water (85 to 95 ° C.) is placed in a depth of 2.0 cm in a polypropylene cylindrical container having a bottom diameter of 9.5 cm and a depth of 12.0 cm, and the layer made of the resin composition is the container. Even if it is a case where the opening of the container is hermetically sealed and packaged and left to stand for 10 seconds, the contents can be confirmed clearly without condensing on the film surface. Even when moisture condenses on the film surface, the water film does not become lens-like and the contents can be confirmed clearly. That is, this film is a film excellent in high temperature anti-fogging property.

  In addition, the present film is prepared by placing water (20 to 25 ° C.) in a depth of 2.0 cm in a polypropylene cylindrical container having a bottom diameter of 9.5 cm and a depth of 12.0 cm. Even when the container opening is sealed with this film so as to come into contact with the container, and the container is stored in a refrigerator at 5 to 8 ° C. for 24 hours, moisture does not condense on the film surface. The contents can be clearly confirmed, or even if moisture condenses on the film surface, the water film does not form a lens and can be confirmed uniformly and clearly. That is, this film is a film excellent in low-temperature antifogging properties.

Furthermore, this film expresses excellent heat-sealability at a general bonding temperature regardless of the material of the bottom material of food packaging containers other than polyolefin, such as polyester.
For example, when the layer of the present resin composition in the present film and the amorphous polyethylene terephthalate film are stacked and heat sealed at 120 to 180 ° C. which is a general bonding temperature range at room temperature (23 ° C.) Furthermore, it has a good sealing property.
In this case, the heat seal strength as the maximum stress in the 180 degree peel test measured at a peel rate of 200 mm / min is preferably 3N / 15 mm or more, and more preferably 4N / 15 mm or more.

  This composition is excellent in transparency, and the total haze value of this film having a single layer thickness of 20 μm is measured based on JIS K7136 (2000) from the viewpoints of designability, visibility of contents, and the like. It is preferably 3.0% or less, more preferably 1.0% or less, and particularly preferably 0.5% or less. The lower limit of the total haze value is not particularly limited, and is preferably as small as possible.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not restrict | limited by the following Example.

<Evaluation method>
The samples obtained in Examples and Comparative Examples were measured and evaluated by the following methods, and the results are shown in Table 1.

(Low temperature anti-fogging evaluation)
Put water (23 ° C) in a depth of 2.0 cm into a polypropylene cylindrical container with a bottom diameter of 9.5 cm and a depth of 12.0 cm, and then seal the opening of the container with a sample. The film was wrapped and stored in a refrigerator at 5 to 8 ° C. for 1 day, and the degree of fogging after storage was evaluated according to the following criteria.
☆: The contents can be clearly confirmed.
A: Water does not condense on the film surface, and the contents can be confirmed.
○: Water is condensed on the film surface, but the contents can be confirmed.
X: Water becomes fine water droplets on the film surface, and the contents cannot be confirmed.

(High temperature anti-fogging evaluation)
Hot water (85-95 ° C.) is poured into a cylindrical cylindrical container made of polypropylene having a bottom diameter of 9.5 cm and a depth of 12.0 cm, and then the opening of the container is sealed using a sample. The film was wrapped as described above, and the degree of haze after standing for 10 seconds was evaluated according to the following criteria.
☆: The contents can be clearly confirmed.
A: Water does not condense on the film surface, and the contents can be confirmed.
○: Water is condensed on the film surface, but the contents can be confirmed.
X: Water becomes fine water droplets on the film surface, and the contents cannot be confirmed.

(Heat sealability)
The obtained sample and an amorphous polyethylene terephthalate film (“Diafoil S-100” manufactured by Mitsubishi Plastics, Inc., thickness: 50 μm) were cut out into a strip shape having a length of 100 mm and a width of 15 mm, respectively, and the short sides thereof One end of the sample was heat-sealed at a set temperature of 165 ° C. for 2 seconds using a heat sealer at room temperature (23 ° C.) to obtain a test piece.
With the heat seal part of this test piece at the center, both ends are attached to both grips of a tensile tester, tensile stress is applied until it breaks at a peel angle of 180 degrees and a peel speed of 200 mm / min, and the maximum stress is heat sealed. The strength was determined to be acceptable if the heat seal strength was 3 N / 15 mm or more.

(transparency)
With respect to the obtained film having a thickness of 20 μm, the total haze was measured and calculated based on JIS K7136 (2000). A sample having a total haze value of 3.0% or less was accepted.

<Materials used>
[Ethylene- (meth) acrylic acid ester copolymer (A)]
(A) -1: Ethylene-methyl methacrylate copolymer (EMMA) (manufactured by Yashara Chemical Co., Ltd., trade name “Hirodyne 7401”, ethylene content: 92.3%, average refractive index: 1.51, Tm: (95.8 ° C, flow start temperature: 101.2 ° C)

[Anti-fogging agent (B)]
(B) -1: glycerin monostearate (manufactured by Riken Vitamin Co., Ltd., monoglycerin fatty acid ester, trade name “Riquemar S-100”)
(B) -2: Polyoxyethylene lauryl ether (manufactured by Riken Vitamin Co., Ltd., ethylene oxide adduct, trade name “Riquemar B-205”)
(B) -3: Decaglycerin oleate (Riken Vitamin Co., Ltd., polyglycerin fatty acid ester, trade name “Poem J-0381V”)
(B) -4: Polyethylene glycol oleate (manufactured by Riken Vitamin Co., Ltd., polyalkylene glycol fatty acid ester, trade name “Riquemar OE-809”)

<Examples and comparative examples>
Example 1
(A) -1, (B) -1 and (B) -2 were weighed at a mixing mass ratio of 99: 0.5: 0.5, and these were kneaded at a laboratory plast mill manufactured by Toyo Seiki Seisakusho Co., Ltd. After kneading for 5 minutes under the conditions of 200 ° C. and a rotational speed of 80 rpm, a film sample having a thickness of 20 μm was obtained between the PET films using a laminator apparatus set so that the cast roll temperature was 200 ° C. The PET film was peeled off, and each measurement and evaluation was performed.

(Example 2)
Production of a film by the same method as in Example 1 except that (A) -1, (B) -1 and (B) -2 were weighed at a mixing mass ratio of 99: 0.75: 0.25, and Evaluation was performed.

(Example 3)
Production of a film in the same manner as in Example 1 except that (A) -1, (B) -1 and (B) -3 were weighed at a mixing mass ratio of 99: 0.5: 0.5, and Evaluation was performed.

Example 4
Production of a film in the same manner as in Example 1 except that (A) -1, (B) -1 and (B) -3 were weighed at a mixing mass ratio of 99: 0.75: 0.25, and Evaluation was performed.

(Comparative Example 1)
Films were prepared and evaluated in the same manner as in Example 1 except that (A) -1 and (B) -1 were weighed at a mixing mass ratio of 99: 1.

(Comparative Example 2)
Films were prepared and evaluated in the same manner as in Example 1 except that (A) -1 and (B) -3 were weighed at a mixing mass ratio of 99: 1.

(Comparative Example 3)
Films were prepared and evaluated in the same manner as in Example 1 except that (A) -1 and (B) -4 were weighed at a mixing mass ratio of 99: 1.

(Comparative Example 4)
(A) -1, (B) -1 and (B) -4 were prepared in the same manner as in Example 1 except that they were weighed at a mixing mass ratio of 99: 0.5: 0.5, and And evaluated.

  As is clear from Table 1, the films using the resin compositions of the examples were all excellent in high temperature antifogging properties, low temperature antifogging properties, and heat sealability to amorphous polyethylene terephthalate films. .

On the other hand, since the film of Comparative Example 1 did not contain an ethylene oxide adduct or a polyglycerin fatty acid ester, the low-temperature antifogging property was insufficient.
Since the film of Comparative Example 2 did not contain a monoglycerin fatty acid ester, the low-temperature antifogging property was acceptable, but the high-temperature antifogging property and heat sealability were insufficient.
The film of Comparative Example 3 did not contain the essential antifogging agent in this film, and although the antifogging property was acceptable, the heat sealability was insufficient.
The film of Comparative Example 4 uses a polyalkylene glycol fatty acid ester instead of the ethylene oxide adduct or the polyglycerin fatty acid ester, and although the antifogging property is acceptable, the heat sealability is insufficient.

Claims (6)

A resin composition comprising an ethylene- (meth) acrylic acid ester copolymer as a main component, and 0.3 parts by mass of a monoglycerin fatty acid ester with respect to 100 parts by mass of the ethylene- (meth) acrylic acid ester copolymer As mentioned above, 1.0 mass part or less is contained, Furthermore, 0.1 mass part or more and 1.0 mass part or less of ethylene oxide adduct, and / or 0.1 mass part or more of polyglycerol fatty acid ester. A resin composition containing 0 part by mass or less and having a crystal melting peak temperature Tm of the ethylene- (meth) acrylic ester copolymer of 80 ° C. or more and 110 ° C. or less .   The resin composition of Claim 1 whose ethylene content of the said ethylene- (meth) acrylic acid ester copolymer is 80 to 99 mol%. The resin composition according to claim 1 or 2 , wherein the ethylene- (meth) acrylic acid ester copolymer is an ethylene-methyl methacrylate copolymer. The resin composition according to any one of claims 1 to 3 , wherein the monoglycerin fatty acid ester is a monoester or diester of glycerin and a saturated fatty acid having 12 to 20 carbon atoms. The resin composition according to any one of claims 1 to 4 , wherein the ethylene oxide adduct is a polyoxyethylene alkyl ether having an ethylene oxide addition number of 1 to 10 mol. The food packaging film which has a layer which consists of a resin composition of any one of Claims 1-5 in an at least one outermost layer.