JP2017100740A - Package for vegetables and fruits - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for vegetables and fruits excellent in keeping freshness of vegetables and fruits.SOLUTION: A package for vegetables and fruits uses a resin composition, which contains at least more than 5 mass% and 90 mass% or less of a cyclic olefin-based resin and a non-cyclic olefin-based resin, as a material. The package for vegetables and fruits contains a multilayer film, and the outermost layer of the multilayer film may be a layer formed of the resin composition. A quantity of gas generated by heating the package for vegetables and fruits at 80°C for 60 minutes may be 60 μg/g or less to the mass of the resin in the package for vegetables and fruits in terms of toluene, based on total ion chromatogram.SELECTED DRAWING: None

Description

  The present invention relates to a package for fruits and vegetables.

  Conventionally, it has been an important issue to distribute vegetables, fruits, flowers, mushrooms and the like (hereinafter, these foods are collectively referred to as “fruits and vegetables”) without impairing the freshness. This is because maintaining the freshness of fruits and vegetables in the distribution process not only relates to consumer satisfaction with products, but also affects various factors such as the suppression of food waste and ease of management of transportation and storage times.

  Various methods for maintaining the freshness of fruits and vegetables have been proposed. For example, methods described in Patent Documents 1 to 8 can be mentioned.

JP 56-88752 A Japanese Unexamined Patent Publication No. Sho 63-110186 JP-A 63-277249 Japanese Patent Publication No. 8-11036 Japanese Patent Publication No. 8-11037 JP-A-62-235086 JP-A-4-327160 JP 2001-55480 A

  However, there is a need for a technology that exhibits even better effects on maintaining the freshness of fruits and vegetables.

  This invention is made | formed in order to solve the said subject, and it aims at providing the package for fruits and vegetables excellent in the freshness maintenance of fruits and vegetables.

  The present inventors have found that the above problems can be solved by a package for fruits and vegetables obtained from a resin composition containing a cyclic olefin resin and an acyclic olefin resin, and have completed the present invention. Specifically, the present invention provides the following.

  (1) A fruit and vegetable packaging body made of a resin composition containing at least 5% by mass and more than 90% by mass of a cyclic olefin-based resin and an acyclic olefin-based resin.

(2) The fruit and vegetable packaging includes a multilayer film,
The outermost layer of the said multilayer film is a package for fruits and vegetables as described in (1) which is a layer which consists of the said resin composition.

  (3) The amount of gas generated by heating the fruit and vegetable package at 80 ° C. for 60 minutes is 60 μg / in terms of toluene with respect to the mass of the resin in the fruit and vegetable package based on the total ion chromatogram. The package for fruits and vegetables according to (1) or (2), which is g or less.

  (4) The packaging for fruits and vegetables according to any one of (1) to (3), wherein the acyclic olefin-based resin is one or more selected from the group consisting of low-density polyethylene, linear low-density polyethylene, and polypropylene. body.

  (5) A method for maintaining freshness of fruits and vegetables, wherein the fruits and vegetables are hermetically packaged using the package for fruits and vegetables according to any one of (1) to (4).

  ADVANTAGE OF THE INVENTION According to this invention, the package for fruits and vegetables excellent in the freshness maintenance of fruits and vegetables is provided.

  Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment.

<Package for fruits and vegetables>
The fruit and vegetable package of the present invention is made of a resin composition containing at least 5% by mass and 90% by mass or less of a cyclic olefin resin and an acyclic olefin resin.

  Fruits and vegetables are matured after harvesting, resulting in changes in the aroma and color of the fruits and vegetables, and softening of the flesh. This maturation phenomenon after harvesting fruits and vegetables is called “ripening”. Ripening is caused by the action of low molecules (such as ethylene) generated from fruits and vegetables. The decrease in freshness of fruits and vegetables after harvesting is caused by ripening, drying, microbial propagation, etc. that occur during storage.

  As a result of examination by the present inventors, according to the package for fruits and vegetables obtained from a resin composition containing at least a cyclic olefin resin and an acyclic olefin resin, ripening and the like can be suppressed, and the freshness of the fruits and vegetables is maintained. It was found easy. The reason for this is that the amount of gas (low molecular weight compound, etc.) generated from the package varies depending on the type of resin contained in the resin composition constituting the fruit and vegetable package. In combination with the olefin resin, it was found that the amount of gas generated from the package was remarkably low. Such an effect was not recognized in the resin composition containing only a non-cyclic olefin resin (polyethylene etc.) normally utilized as a material for packaging for fruits and vegetables.

  The compounding quantity of cyclic olefin resin in the resin composition which comprises the package for fruits and vegetables of this invention is more than 5 mass% and 90 mass% or less with respect to a resin composition. If necessary, the resin composition can be formed into a package for fruits and vegetables after being processed into a film or the like. The compounding amount of the cyclic olefin resin in the resin composition corresponds to the compounding amount in the film when the film molded from the resin composition is a single layer film, and the film molded from the resin composition When it is a multilayer film, it corresponds to the blending amount in one layer constituting the film. When the film formed from the resin composition is a multilayer film, the layer constituting the multilayer film may include a plurality of layers in which a cyclic olefin-based resin is blended in an amount of more than 5% by mass and 90% by mass or less.

  The lower limit of the blending amount of the cyclic olefin resin in the resin composition in the present invention is not particularly limited as long as the acyclic olefin resin can be sufficiently blended, preferably 6% by mass or more, more preferably based on the resin composition. Is 10% by mass or more. The upper limit of the amount of the cyclic olefin-based resin in the resin composition in the present invention is preferably 85% by mass or less, more preferably 70% by mass or less, based on the resin composition.

  As the amount of the cyclic olefin-based resin in the resin composition in the present invention increases, the amount of gas (particularly low molecular weight compound) generated from the package is easily reduced. The “gas generated from the package” in the present invention is specified as the amount of gas generated based on the total ion chromatogram described later.

  In the resin composition in the present invention, an acyclic olefin resin is blended together with the cyclic olefin resin. The lower limit of the blending amount of the acyclic olefin-based resin in the resin composition in the present invention is preferably 10% by mass or more, more preferably 20% by mass or more with respect to the resin composition. The upper limit of the amount of the acyclic olefin-based resin in the resin composition in the present invention is preferably less than 95% by mass, more preferably 90% by mass or less, based on the resin composition.

  Hereinafter, the components in the resin composition that is the material of the package for fruits and vegetables will be described in detail. In addition, in this invention, "the resin composition which is a material of the package for fruits and vegetables" refers to the resin composition which can obtain a film and a package by shape | molding with the shaping | molding method mentioned later.

[Cyclic olefin resin]
The cyclic olefin resin in the present invention is not particularly limited as long as it is a polymer or copolymer containing a structural unit derived from a cyclic olefin in the main chain. For example, an addition polymer of a cyclic olefin or a hydrogenated product thereof, an addition copolymer of a cyclic olefin and an α-olefin, or a hydrogenated product thereof can be used. A cyclic olefin resin may be used individually by 1 type, and may use 2 or more types together.

  Examples of the cyclic olefin-based resin include those obtained by grafting and / or copolymerizing an unsaturated compound further having a polar group in the polymer or copolymer having a structural unit derived from a cyclic olefin in the main chain. Examples of the polar group include a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, and a hydroxyl group. Examples of the unsaturated compound having a polar group include (meth) acrylic acid and maleic acid. Acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1-10) ester, maleic acid alkyl (carbon number 1-10) ester, (meth) acrylamide, (meta ) 2-hydroxyethyl acrylate.

（式中、Ｒ^１〜Ｒ^１２は、それぞれ同一でも異なっていてもよく、水素原子、ハロゲン原子、及び、炭化水素基からなる群より選ばれるものであり、
Ｒ^９とＲ^１０、Ｒ^１１とＲ^１２は、一体化して２価の炭化水素基を形成してもよく、
Ｒ^９又はＲ^１０と、Ｒ^１１又はＲ^１２とは、互いに環を形成していてもよい。
また、ｎは、０又は正の整数を示し、
ｎが２以上の場合には、Ｒ^５〜Ｒ^８は、それぞれの繰り返し単位の中で、それぞれ同一でも異なっていてもよい。） Particularly preferable examples of the addition copolymer of cyclic olefin and α-olefin include [1] a structural unit derived from an α-olefin having 2 to 20 carbon atoms and [2] represented by the following general formula (I). And a copolymer containing a structural unit derived from a cyclic olefin.

(Wherein R ^{1 to} R ¹² may be the same as or different from each other, and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group;
R ⁹ and R ¹⁰ , R ¹¹ and R ¹² may be integrated to form a divalent hydrocarbon group,
R ⁹ or R ¹⁰ and R ¹¹ or R ¹² may form a ring with each other.
N represents 0 or a positive integer;
When n is 2 or more, R ^{5 to} R ⁸ may be the same or different in each repeating unit. )

[[1] α-olefin having 2 to 20 carbon atoms]
The α-olefin having 2 to 20 carbon atoms is not particularly limited. For example, the thing similar to Unexamined-Japanese-Patent No. 2007-302722 can be mentioned. These α-olefins may be used singly or in combination of two or more. Among these, it is preferable to use ethylene alone.

[[2] Cyclic olefin represented by general formula (I)]
The cyclic olefin represented by the general formula (I) will be described. R ^{1 to} R ¹² in the general formula (I) may be the same or different and are selected from the group consisting of a hydrogen atom, a halogen atom, and a hydrocarbon group. Specific examples of the cyclic olefin represented by the general formula (I) include those similar to those described in JP-A-2007-302722. These cyclic olefins may be used singly or in combination of two or more. In particular, bicyclo [2.2.1] hept-2-ene (common name: norbornene) is preferably used alone.

  [1] A polymerization method of an α-olefin having 2 to 20 carbon atoms and a cyclic olefin represented by [2] general formula (I) and a hydrogenation method of the obtained polymer are not particularly limited. And can be carried out according to known methods. Also, the polymerization catalyst used in the polymerization is not particularly limited, and a known method using a conventionally known catalyst such as a Ziegler catalyst (Ziegler-Natta catalyst, etc.), a metathesis catalyst, a metallocene catalyst or the like. A cyclic olefin resin can be obtained.

  It is preferable that the glass transition point of cyclic olefin resin is 30 degreeC or more and 140 degrees C or less. If the glass transition point of cyclic olefin resin is 30 degreeC or more, it is preferable at the point which is easy to prevent adhesion (blocking) of cyclic olefin resin pellets at the time of shaping | molding of a resin composition. If the glass transition point of cyclic olefin resin is 140 degrees C or less, since it is close to the processing temperature of non-cyclic olefin resin (polyethylene resin etc.) mentioned later, since resin blending etc. are easy, it is preferable.

  The glass transition point of the cyclic olefin resin can be adjusted by adjusting the content of the cyclic olefin skeleton of the main chain. Further, as the glass transition point, a value measured by a DSC method (method described in JIS K7121) under a temperature rising rate of 10 ° C./min is adopted.

  A commercially available resin can also be used as the cyclic olefin resin in the present invention. Examples of commercially available cyclic olefin-based resins include TOPAS (registered trademark) (manufactured by TOPAS Advanced Polymers), Apel (registered trademark) (manufactured by Mitsui Chemicals), Zeonex (registered trademark) (manufactured by Nippon Zeon), and ZEONOR ( (Registered trademark) (manufactured by Zeon Corporation), Arton (registered trademark) (manufactured by JSR Corporation), and the like.

[Acyclic olefin resin]
As the acyclic olefin-based resin in the present invention, a resin usually used for food packaging can be used, for example, low density polyethylene (LDPE), high density polyethylene (HDPE), polyethylene, and C4 to C8 α-. Polyethylene resins such as linear low density polyethylene (LLDPE) that are copolymers with olefin monomers; random polypropylene (rPP) that is a copolymer of polyethylene and homopolypropylene (hPP), ethylene, etc .; block copolymer Polypropylene resins such as polymerized polypropylene (b-PP); ethylene acrylic acid copolymer (EAA), ethylene ethyl acrylate copolymer (EEA), ethylene methyl acrylate copolymer (EMA), ethylene methacrylic acid copolymer Coalescence (EMAA), ethylene methyl methacrylate copolymer Body (EMMA), ethylene-vinyl copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), polyvinyl alcohol (PVA), polystyrene (PS), include ionomers (ION) and the like. Acyclic olefin resin may be used individually by 1 type, and may use 2 or more types together.

  Among the above, the basic properties such as strength and toughness of a molded product (film or package) obtained from the resin composition are easily improved, and are excellent in versatility and film-forming properties, and can control costs. The acyclic olefin resin is preferably at least one selected from the group consisting of low density polyethylene, linear low density polyethylene and polypropylene.

[Other ingredients]
In the resin composition in the present invention, in addition to the cyclic olefin-based resin and the non-cyclic olefin-based resin, components usually used as components of a film or a package may be appropriately blended. Examples of such components include resins other than cyclic olefin resins and non-cyclic olefin resins (polyamide, polyester, polycarbonate, etc.), antioxidants, colorants, antiblocking agents, slip materials, antifogging agents, and the like. . The amount of these components in the resin composition is appropriately adjusted according to the effect to be obtained.

[Method for Producing Resin Composition]
The method for producing the resin composition is not particularly limited as long as the components in the resin composition can be uniformly mixed. For example, using a melt-kneading apparatus such as a single-screw or twin-screw extruder, the components are mixed. Examples thereof include a method of processing the obtained resin composition into a desired form such as powder, flakes, pellets, etc. after melt-kneading and extruding.

[Film Production Method]
The package for fruits and vegetables can be produced as it is from the resin composition, or can be produced from a film molded from the resin composition. As a film forming method, inflation molding, cast molding using a T-die, calendar molding, dry lamination, extrusion lamination, or the like can be employed.

  The film structure may be a single layer film made of the above resin composition, but a film made of the above resin composition and paper, a resin film (polyethylene film, PET film, nylon film, etc.) and the like are laminated. It may be a multilayer film. Moreover, when preparing the film in this invention as a multilayer film, multiple layers which consist of the said resin composition may be included.

  The film constituting the package for fruits and vegetables is preferably a multilayer film because it is easy to reduce the amount of gas generated based on the total ion chromatogram described later.

  When the film in the present invention is prepared as a multilayer film, the constitution of the layer is not particularly limited. For example, a two-layer multilayer film including a layer composed of the resin composition and a paper layer, an intermediate layer, and the intermediate layer It may be a multilayer film of three or more layers including two outer layers (hereinafter, the two outer layers sandwiching the intermediate layer are also referred to as “inner layer” and “outer layer”) disposed on both outer sides of the sandwich. Further, in addition to the three layers of the intermediate layer, the inner layer, and the outer layer, additional layers such as a second intermediate layer and a third intermediate layer may be provided. That is, the intermediate layer may be composed of a plurality of layers.

  As will be described later, in the fruit and vegetable package of the present invention, the generation of gas from the package is suppressed. The effect is that the film made of the above resin composition (that is, a film containing at least 5% by mass of 90% by mass or less of a cyclic olefin resin and an acyclic olefin resin) is the outermost layer of the package (that is, outside air). It is easy to play when it is a layer in contact with. Therefore, when preparing the film in this invention as a multilayer film, it is preferable that the outermost layer is a layer which consists of the said resin composition.

  The composition ratio of the thickness of each layer in the multilayer film is not particularly limited, and the thickness of each layer may be the same or different. For example, the ratio of the thickness of each layer may be the thickness of the outer layer: the thickness of the intermediate layer: the thickness of the inner layer = 3: 1: 3 to 1.5: 1: 1.5. The thickness of the inner layer and the thickness of the outer layer are preferably the same in that the curling of the film can be prevented. The total layer thickness of the film (that is, the total thickness of each layer) is not particularly limited. The total thickness of the film can be adjusted to, for example, 20 μm or more and 200 μm or less.

<Manufacturing method of packaging for fruits and vegetables>
The package for fruits and vegetables can be obtained by molding the resin composition or the film. For example, a bag-shaped package can be obtained by laminating a plurality of the above films or by laminating the above films and paper.

  You may shape | mold the package for fruits and vegetables as a package which has a zipper shape which combined the film, the extrusion molding component, etc.

  In the manufacture of the package for fruits and vegetables, after forming a film, the package may be obtained by processing the film. Examples of the film processing method include vacuum forming.

  The package for fruits and vegetables may be obtained by injection molding the resin composition.

  Although it will not specifically limit as a form of the package for fruits and vegetables, if a shape which can package fruits and vegetables, A wrap film, a bag shape, a box shape, a container shape etc. are mentioned.

<Properties of packaging for fruits and vegetables>
According to the package for fruits and vegetables of the present invention, the freshness of fruits and vegetables can be maintained over a long period of, for example, three days or longer. Examples of the method for preserving fruits and vegetables using the package for fruits and vegetables of the present invention include a method in which the fruits and vegetables are placed in the package for fruits and vegetables and sealed as necessary. Storage temperature can be selected according to the kind of fruit and vegetables, and it is 0-40 degreeC normally.

  In the package for fruits and vegetables of the present invention, the generation of gas from the package is suppressed. Specifically, the amount of gas generated by heating the fruit and vegetable package at 80 ° C. for 60 minutes is toluene based on the total ion chromatogram (TIC) relative to the mass of the resin in the fruit and vegetable package. In conversion, it can be 60 μg / g or less, preferably 50 μg / g or less, and more preferably 20 μg / g or less. The lower limit of the amount of generated gas based on TIC (in terms of toluene) is preferably 0 μg / g or more with respect to the mass of the resin in the package for fruits and vegetables. The amount of gas generated based on TIC is specified based on the total mass of the resin (cyclic olefin resin or acyclic olefin resin) in the package for fruits and vegetables. That is, when the package for fruits and vegetables includes, for example, a multilayer film including a layer that does not include a resin (such as a paper layer), the amount of gas generated based on the TIC is calculated excluding the mass of components other than the resin (such as paper). .

  Since the amount of generated gas based on TIC (in terms of toluene) indicates the amount of low-molecular compound (C2 to C16 compound) generated, the package for fruits and vegetables of the present invention with a small amount of generated gas contains low-molecular compounds such as ethylene. It is unlikely to occur, it can suppress the ripening of fruits and vegetables, and it is presumed that the freshness is hardly impaired.

  The amount of generated gas based on TIC (in terms of toluene) is specified by the method shown in the examples.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these.

<Preparation of resin composition and film>
The components shown in Tables 1 and 2 were melted and kneaded by a twin-screw extruder and extruded to obtain a pellet-shaped resin composition. Next, a three-layer inflation film having an intermediate layer, an outer layer and an inner layer sandwiching the intermediate layer was prepared from the resin composition using a three-layer inflation molding machine (manufactured by Tommy Machinery Co., Ltd.). Films having the same composition in the outer layer, the intermediate layer, and the inner layer (for example, Example 4 and Comparative Example 1) were prepared as an inflation film having a single layer structure by laminating three layers made of the same raw material with a molding machine. The conditions for forming the inflation film are as follows.

[Film forming conditions]
A die (die diameter: 106 mm, lip clearance: 2.5 mm) and a screw (φ = 40 mm, L / D = 26) were used. The cylinder temperature of the outer layer and the inner layer of the film was set to 190 ° C., and the cylinder temperature of the intermediate layer of the film was set to 210 ° C. The die temperature was set to 190 ° C., the blow ratio was set to 2.0, and the take-up speed was set to 11 m / min.

The abbreviations in the table indicate the names of the components of the film and indicate the following contents, respectively. In addition, the numerical value shown in the parenthesis in the composition of each layer in the table indicates the mass% of each component when the total composition in each layer is 100 mass%. For example, in the outer layer of Example 1, “2045G” is 40% by mass with respect to the entire outer layer, and “8007F” is 60% by mass with respect to the entire outer layer.
2045G: Trade name “DOWLEX 2045G”, linear low density polyethylene (manufactured using a Ziegler-Natta catalyst) copolymerized with an α-olefin having 8 carbon atoms, 1001XV manufactured by Dow Chemical Co. : Linear low-density polyethylene (manufactured using Ziegler-Natta catalyst) copolymerized with α-olefin having 4 carbon atoms, ExxonMobil Chemical Company 8007F: Trade name “8007F-600 ”, Cyclic olefin resin, manufactured by TOPAS Advanced Polymers

<Evaluation of film>
The amount of gas generated from the obtained inflation film, water vapor barrier property, and oxygen permeability were evaluated by the following methods. The results are shown in Tables 1 and 2.

[Quantification method of generated gas volume]
1 g of inflation film (about 10 cm × 20 cm for a film with a total thickness of 50 μm, about 10 cm × 33 cm for a film with a total thickness of 30 μm) in a horizontal tubular furnace (trade name “VOC-400”, manufactured by KPI) Heating was performed at a constant temperature (80 ° C.), and the generated gas was trapped by a Tenax tube. The carrier gas was He, and the flow rate was 100 ml / min. Tenax tube TA trap temperature was set to 5 ° C.
Next, a Tenax tube was attached to the autosampler, and the trapped generated gas was heated and desorbed (trade name “Gerstel TDS-3”, manufactured by Gester Co.) and a gas chromatograph mass spectrometer (trade name “Agilent 7890/5975” (Agilent Technology Co., Ltd.). Furthermore, a fixed amount (10 μg) of standard toluene was collected and supported on a Tenax tube, and the same analysis was performed. Through these operations, the total ion chromatogram (TIC) value was converted to toluene, and the total amount of gas generated from the film was calculated. Desorption conditions were 280 ° C. and 10 min, trap temperature was 130 ° C., and re-desorption temperature was 300 ° C. DB-5ms (30m, ID = 0.25mm, IF = 0.1micrometer) was used for the column. By measuring the amount of gas generated based on TIC, the amount of low-molecular compound (C2-C16 compound) generated can be specified.

[Evaluation of water vapor barrier properties]
Using a water vapor transmission meter (trade name “L80 series”, manufactured by Lyssy), moisture sensitivity of the water vapor transmission rate of the inflation film (also referred to as “MVTR”, the unit is g / m ² · day). Measured based on the sensor method. The measurement temperature was set to 40 ° C., a film was placed at the chamber interface between 90% relative humidity and 10% relative humidity, and the water vapor transmission rate was measured. The measurement area was 50 cm ² . The lower the water vapor transmission rate, the less water vapor can pass through and the better the water vapor barrier property.

[Evaluation of oxygen permeability]
The oxygen permeability of the inflation film (also referred to as “OTR”, the unit is cc / m ² · day) is measured using an oxygen permeability measuring device (trade name “OX-TRAN series”, manufactured by MOCON). , Measured based on the MOCON method. The measurement temperature was set to 23 ° C., and the measurement humidity was 0% RH. The measurement area was 0.78 cm ² . The lower the oxygen permeability, the more difficult it is to pass oxygen.

<Evaluation of packaging for fruits and vegetables>
Two each of the resulting inflation films were used, and the inner layers were overlapped to produce a 20 cm × 20 cm bag-shaped package (corresponding to a package for fruits and vegetables) in which three sides were heat-sealed. Using the package, its freshness retention ability was evaluated. The results are shown in Tables 1 and 2.

[Freshness test]
After putting fruits and vegetables (chopped cabbage, cucumber, or eggplant) in the package, the opening was heat sealed and sealed. However, in Comparative Example 3, after the fruits and vegetables were put into the package, heat release was not performed and the fruits and vegetables were released. These packagings were left in a constant temperature and humidity environment (23 ° C., 50% RH), and the freshness maintaining state of the fruits and vegetables was visually observed. For each fruit and vegetable, the freshness retention period was specified from the time when it was left to stand until the time when it was recognized that the freshness was lost.

The criteria for the loss of freshness for each fruit and vegetable are as follows.
(Chopped cabbage)
The leaves became wet and discoloration was observed.
(Cucumber)
The surface lost gloss and discoloration was observed.
(Nasu)
The surface lost gloss and wrinkles were observed.

  As shown in Table 1, the film satisfying the requirements of the present invention tended to generate less gas based on TIC. This is presumed that the film in the present invention hardly generates a low molecular compound (C2 to C16 compound such as ethylene) and does not easily impair the freshness of fruits and vegetables. In fact, the packaging obtained from the film satisfying the requirements of the present invention was able to maintain the freshness of fruits and vegetables for a long time. This tendency was more remarkable as the amount of the cyclic olefin resin blended in the film was larger.

  On the other hand, as shown in Table 2, it was speculated that a film that does not satisfy the requirements of the present invention has a large amount of generated gas and is likely to generate a low molecular compound. As expected, a package obtained from a film that does not satisfy the requirements of the present invention could not maintain the freshness of fruits and vegetables over a long period of time. As shown in Comparative Example 2, even if the water vapor barrier property was increased by increasing the thickness and the oxygen permeability was lowered, the freshness of the fruits and vegetables could not be sufficiently maintained. It was understood that it was necessary to suppress the generation of low molecular weight compounds from the package.

Claims (5)

  A package for fruits and vegetables made of a resin composition containing at least 5% by mass and 90% by mass or less of a cyclic olefin-based resin and an acyclic olefin-based resin. The package for fruits and vegetables includes a multilayer film,
The package for fruits and vegetables according to claim 1, wherein the outermost layer of the multilayer film is a layer made of the resin composition.   The amount of gas generated by heating the fruit and vegetable package for 60 minutes at 80 ° C. is 60 μg / g or less in terms of toluene with respect to the mass of the resin in the fruit and vegetable package based on the total ion chromatogram. The package for fruits and vegetables according to claim 1 or 2.   The fruit and vegetable package according to any one of claims 1 to 3, wherein the acyclic olefin-based resin is at least one selected from the group consisting of low-density polyethylene, linear low-density polyethylene, and polypropylene.   A method for maintaining freshness of fruits and vegetables, wherein the fruits and vegetables are sealed and packaged using the fruits and vegetables package according to any one of claims 1 to 4.