JP6816584B2 - Releasable laminated film and packaging - Google Patents

Description

The present invention relates to a releasable laminated film and a package, for example, a releasable laminated film and a package having good releasability for foods containing water and the like.

Conventionally, food packaging using a transparent resin film has been widely used, but with the expansion of the market and the diversification of consumer needs, the required quality for the transparent resin film is increasing. In particular, in the transparent resin film, it is desired to improve the releasability so that the content does not remain in the package when the content is taken out as a food package. In addition to the packaging manufactured by blow molding or injection molding, the film is molded into the packaging by deep drawing molding, and the contents can be filled all at once. For deep drawing molding that can reduce transportation costs. The demand for film is increasing.

In order to impart mold releasability to the transparent resin film, a release agent is coated on the base film and a release agent is added to the base resin when the film is formed. ing. Examples of the transparent resin film imparted with releasability include a releasable film obtained by applying a silicone coat layer to a biodegradable film (see, for example, Patent Document 1), and an anchor coat layer containing an unevenness-imparting agent on a base material layer. A release film coated with a non-adhesive layer containing inorganic particles that have been hydrophobized (see, for example, Patent Document 2) and a film obtained by adding silicone oil and polylactone-modified polysiloxane to a synthetic resin have been proposed (for example,). , Patent Document 3).

JP-A-2007-090652 JP-A-2016-043990 Japanese Patent Application Laid-Open No. 8-003455

However, the releasable film described in Patent Documents 1 and 2 requires a drying step and a long-time aging step after the coating liquid is applied, so that the manufacturing cost may increase. Further, when the coating process is provided, it cannot be applied to the raw fabric of the tube for bag making products, and the manufacturing method of the base film may be limited or the heat sealability may be deteriorated. Further, in the film described in Patent Document 3, since liquid silicone oil is kneaded into the synthetic resin, the screw shape, the type of extruder, etc. are restricted, and the film slips during kneading, resulting in poor dispersion. Is a problem. Further, in all of the techniques described in Patent Documents 1 to 3, the releasability is improved by imparting hydrophobicity to the film, but sufficient releasability may not always be obtained.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a releasable laminated film and a package having excellent releasability and heat sealability.

As a result of diligent studies, the present inventors have found that the above problems can be solved by using a release layer containing a polyolefin resin and a polyalkylene oxide, and have completed the present invention. That is, the present invention is as follows.

The releasable laminated film according to the present invention is characterized by comprising a base material layer and a releasable layer provided on the base material layer and containing a polyolefin resin and a polyalkylene oxide.

According to the releaseable laminated film according to the present invention, the surface of the release layer becomes hydrophilic due to the polyalkylene oxide having a high affinity with water contained in the release layer, and water is formed on the surface of the release layer. Since a film is formed, the releasability is significantly improved as compared with the case where the release layer is provided with hydrophobicity. As a result, the contact angle of the release layer with water is significantly reduced, so that excellent releasability can be obtained even when the surface of the release layer comes into contact with food containing water. Then, sufficient heat-sealing property can be obtained by the polyolefin resin contained in the release layer. Therefore, it is possible to realize a releasable laminated film and a package having excellent releasability and heat sealability.

In the releasable laminated film, the releasable layer preferably has a contact angle with water of 90 ° or less.

In the releasable laminated film, the content of the polyalkylene oxide in the releasable layer is preferably 0.5% by mass or more and 50% by mass or less.

In the releasable laminated film, the releasable layer preferably has a thickness of 1 μm or more and 100 μm or less.

In the releasable laminated film, it is preferable that the base material layer contains at least one selected from the group consisting of a polyolefin resin, a polyamide resin, a polyester resin, and an ethylene vinyl acetate resin.

The releasable laminated film is preferably a coextruded film.

The releasable laminated film is preferably a laminated film.

The package according to the present invention is characterized by containing the above-mentioned releasable laminated film.

In the package, it is preferable that the release layer is provided on the packaged side with respect to the base material layer.

According to the present invention, it is possible to realize a releasable laminated film and a package having excellent releasability and heat sealability.

FIG. 1 is a schematic cross-sectional view of a releasable laminated film according to an embodiment of the present invention. FIG. 2 is a schematic view of a package according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

FIG. 1 is a schematic cross-sectional view of a releasable laminated film according to an embodiment of the present invention. As shown in FIG. 1, the releasable laminated film 1 according to the present embodiment is provided on a base material layer 11 containing a thermoplastic resin or the like and a base material layer 11, and is provided on a polyolefin resin and a polyalkylene oxide. Includes a release layer 12 containing. Hereinafter, various components of the releasable laminated film 1 according to the present embodiment will be described in detail.

The base material layer 11 is not limited as long as it contains, for example, a generally used thermoplastic resin. Among these thermoplastic resins, the base material layer 11 is suitable for the deep draw moldability, pinhole resistance and strength of the releasable laminated film 1 or for the moisture-proof and releasable laminated film 1. From the viewpoint of imparting elasticity, it is preferable to contain at least one selected from the group consisting of polyolefin resins, polyamide resins, polyester resins and ethylene vinyl acetate resins.

The base material layer 11 preferably contains a polyolefin-based resin (PO) layer. Since the base material layer 11 contains the polyolefin-based resin, the interlayer adhesiveness with the release layer 12 is improved, and the strength of the releasable laminated film 1 can be increased by increasing the thickness of the releasable laminated film 1. , The release layer 12 can be made to the minimum necessary thickness.

Examples of the polyolefin-based resin used for the base material layer 11 include a resin similar to the polyethylene-based resin used for the release layer 12, a polypropylene-based resin such as homopolypropylene and a propylene-α-olefin copolymer, and ethylene-acetic acid. Examples include vinyl copolymer (EVA). Examples of the α-olefin include ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-octene and the like.

As the base material layer 11, it is preferable that the releasable laminated film 1 contains a polyamide resin (PA) from the viewpoint of further improving the deep drawing moldability, pinhole resistance, and strength. Further, the base material layer 11 may have a plurality of layers laminated. When a plurality of layers of the base material layer 11 are laminated, it is preferable that the polyamide resin layer is contained in at least one layer of the base material layer 11.

The base material layer 11 preferably contains a polypropylene-based resin (PP) from the viewpoint of imparting appropriate elasticity to the moisture-proof and releasable laminated film 1. From the viewpoint of imparting oxygen barrier properties, it is preferable to dispose a layer made of ethylene-vinyl acetate copolymer saponified product (EVOH) as the base material layer 11. The base material layer 11 preferably contains a polyester-based resin from the viewpoint of imparting strength and printability to the film.

In the releasable laminated film 1, since the releasable layer 12 contains a polyolefin-based resin, it is possible to impart sufficient heat-sealing property when the releasable laminated film 12 is used as a package. Examples of the polyolefin resin include polypropylene resins such as random polypropylene, homopolypropylene and block polypropylene, polybutene resins, low density polyethylene, linear low density polyethylene, ultra low density polyethylene, medium density polyethylene, high density polyethylene and the like. Polyethylene resin such as ultra-high density polyethylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-octen-1 copolymer, propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer , Ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer and other copolymers. These may be used alone or in combination of two or more. Further, as the polyolefin-based resin, easy peeling property (EP) can be imparted by blending a plurality of types. Among these, as the polyolefin resin, random polypropylene, block polypropylene, linear low density polyethylene, low density polyethylene and high density polyethylene are preferable from the viewpoint of improving heat resistance and heat sealability.

Further, the release layer 12 may contain a polyester resin, a polystyrene resin, an acrylic resin, a nylon resin, or the like from the viewpoint of adjusting the heat sealability when packaging the object to be packaged.

As the polyolefin resin, those having a melting point of 100 ° C. or higher and 155 ° C. or lower are preferable from the viewpoint that the heat sealing of the package is generally performed at 120 ° C. or higher and 160 ° C. or lower. Further, the polyolefin-based resin is more preferably in the range of 120 ° C. or higher and 155 ° C. or lower when used for retort packaging. The melting point of the polyolefin resin can be measured by a method according to JIS K 7121.

The melt flow rate (JIS K 7210) of the polyolefin resin of the release layer 12 is preferably 0.1 g / 10 minutes or more and 50 g / 10 minutes or less, and more preferably 1 g / 10 minutes or more and 10 g / 10 minutes or less.

Further, in the release laminated film 1, since the release layer 12 contains a polyalkylene oxide, the oxygen atom of the polyalkylene oxide improves the affinity between the release layer 12 and water. As a result, the surface 12A of the release layer 12 becomes hydrophilic, and it is considered that the releasability is significantly improved as compared with the case where the release layer 12 is imparted with hydrophobicity.

The polyalkylene oxide is not particularly limited as long as the surface 12A of the release layer 12 is hydrophilic. Examples of the polyalkylene oxide include ethylene oxide (ethylene glycol), propylene oxide (propylene glycol), butylene oxide (butylene glycol), 1,2-butylene oxide, 1,3-butylene oxide, and 1,4-butylene oxide. Polymers such as 2,3-butylene oxide and pentyl oxide (pentyl glycol) can be mentioned. These alkylene oxides may be used alone or may be a copolymer of two or more kinds. Among these, polyethylene oxide, polypropylene oxide, and polyethylene oxide-polypropylene oxide copolymer are preferable, and polyethylene oxide is more preferable, from the viewpoint of exhibiting releasability and being easily available and handled.

The polyalkylene oxide preferably has a weight average molecular weight (Mw) of 10,000 or more and 6 million or less, more preferably 20,000 or more and 5 million or less, and further preferably 30,000 or more and 4 million or less. When the weight average molecular weight of the polyalkylene oxide is 10,000 or more, the decrease in releasability due to bleed-out is unlikely to occur, and when the weight average molecular weight is 6 million or less, the decrease in strength or releasability due to poor dispersion is unlikely to occur.

The content of the polyalkylene oxide in the release layer 12 is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, and 1% by mass in terms of mass ratio from the viewpoint of obtaining sufficient releasability. The above is more preferable. Further, although there is no limit to the upper limit of the content of the polyalkylene oxide in the release layer 12, the viewpoint of preventing the decrease in strength and transparency of the releasable laminated film 1 due to poor dispersion with the polyolefin resin, and the heat treatment. From the viewpoint of improving the heat resistance at the time of applying the above, the mass ratio is preferably 50% by mass or less, more preferably 45% by mass or less, still more preferably 40% by mass or less.

Additives can be added to the release layer 12 as long as the release performance is not impaired. Examples of the additive include an anti-blocking agent, a slip agent, a processing aid, an antioxidant, an ultraviolet absorber and the like.

The contact angle of the release layer 12 with distilled water is preferably 90 ° or less, more preferably 89.5 ° or less, still more preferably 89 ° or less. When the contact angle is 90 ° or more, sufficient mold release performance can be obtained even when used for packaging water-containing foods such as rice cakes. The contact angle with the distilled water was measured as the angle formed by the release layer 12 20 seconds after the distilled water was dropped onto the release layer and the surface of the dropped distilled water.

The thickness of the release layer 12 is preferably 1 μm or more and 100 μm or less, and more preferably 2 μm or more and 50 μm or less, from the viewpoint of obtaining sufficient heat sealability and reducing the manufacturing cost. Further, when another thermoplastic resin layer is arranged on the releasable laminated film 1 to form a multilayer film, the thickness of the releasable layer 12 is appropriately adjusted by considering the function and thickness of the other layer. Can be set to a range.

The internal haze at a thickness of 10 μm according to JIS K 7105 in the release layer 12 is preferably 30% or less, more preferably 20% or less, and more preferably 20% or less, from the viewpoint of ensuring sufficient visibility of the packaged body as the content. % Or less is more preferable.

Further, in the releasable laminated film 1, an adhesive resin (AD) may be laminated between the base material layer 11 and the releasable layer 12, and a plurality of base material layers 11 may be laminated via the adhesive resin layer. May be laminated. Examples of the layer structure of the releasable laminated film 1 include the following. In the following, the description of the adhesive resin layer is omitted, and the description is given in the order of the base material layer (each layer) / release layer. Among these, the layer configurations of (2-1), (2-2), (4-1), and (4-2) are considered in terms of the strength of the releasable laminated film 1, the suitability for deep drawing, and the manufacturing cost. Is preferable.
(1) Base material layer (PO) / Release layer (2-1) Base material layer (PA) / Release layer (2-2) Base material layer (PA) / Base material layer (PO) / Release layer (3-1) Base material layer (PA) / base material layer (EVOH) / release layer (3-2) Base material layer (PA) / base material layer (EVOH) / base material layer (PO) / mold release Layer (4-1) Base material layer (PE or PP) / Base material layer (PA) / Release layer (4-2) Base material layer (PE or PP) / Base material layer (PA) / Release layer ( 5-1) Base material layer (PE or PP) / Base material layer (PA) / Base material layer (EVOH) / Release layer (5-2) Base material layer (PE or PP) / Base material layer (PA) / Base material layer (EVOH) / Base material layer (PO) / Release layer (5-3) Base material layer (PE or PP) / Base material layer (PA) / Base material layer (EVOH) / Release layer ( 6-1) Base material layer (PE or PP) / Base material layer (EVOH) / Base material layer (PA) / Release layer (6-2) Base material layer (PE or PP) / Base material layer (EVOH) / Base material layer (PA) / Base material layer (PO) / Release layer (7-1) Base material layer (EVOH) / Release layer (7-2) Base material layer (EVOH / Base material layer (PO)) / Release layer (8-1) Base material layer (PET) / Release layer (8-2) Base material layer (PET) / Base material layer (PO) / Release layer

The ratio of the thickness of the base material layer 11 and the release layer 12 is not particularly limited. The ratio of the thickness of the base material layer 11 to the release layer 12 is preferably 1: 500 to 1: 1, for example.

The releasable laminated film 1 can be produced by a known method, for example, a coextrusion method, a dry laminating method, an extrusion laminating method, a hot melt laminating method, or the like. The releasable laminated film 1 is preferably manufactured by the dry laminating method because the base material layer 11 and the releasable layer 12 can be laminated even if the extrusion temperature and the manufacturing method are different. From the viewpoint of reducing the manufacturing cost, it is preferable that the release layer 12 can be laminated on the film made of the base material layer 11 manufactured in advance by the extrusion laminating method, and the base material layer 11 can be laminated by the coextrusion method. And the release layer 12 can be laminated and manufactured, which is more preferable.

The packaging form and layer structure of the releasable laminated film 1 can be appropriately selected according to the contents. An example of the packaging form is shown below.
(1) Deep drawing packaging (2) Pouch packaging (3) Pillow packaging (4) Vacuum packaging

For deep-drawing packaging applications, the above-mentioned releasable laminated film produced without stretching, which is easy to stretch when drawing, is preferable. For pouch packaging, pillow packaging, and vacuum packaging, the releasable laminated film according to the above-described embodiment produced without stretching and, for example, stretched biaxially stretched polyester film from the viewpoint of imparting strength and gas barrier properties. A releasable laminated film in which a film is laminated by a dry laminating method or the like is preferable.

Next, a package using the releasable laminated film according to the above embodiment will be described. FIG. 2 is a schematic view of the package 2 according to the present embodiment. As shown in FIG. 2, the package 2 wraps rice cake 13, which is a food containing water, between a pair of releasable laminated films 1A and 1B according to the above embodiment. .. In the package 2, the pair of releasable laminated films 1A and 1B are arranged on the rice cake 13 side in which the releasable layer 12 (not shown in FIG. 2, see FIG. 1) is the packaged body, and the releasable layer 12 is arranged. 12 and rice cake 13 come into contact with each other. The releasable laminated films 1A and 1B are provided with sealing portions 21A and 21B at the ends, and a frozen or chilled rice cake 13 is arranged at the center. Then, in the package 2, after the air between the pair of releasable laminated films 1A and 1B is exhausted, the sealing portions 21A and 21B are adhered by heat sealing between the releasable laminated films 1A and 1B. The rice cake 13 is packaged. After that, it is sterilized by heating and then stored. In the package 2, when the rice cake 13 is taken out from the package 2, the surface of the release layer 12 on the surface of the releasable laminated films 1A and 1B that come into direct contact with the rice cake 13 becomes hydrophilic. The rice cake 13 can be peeled off without sticking to the releasable laminated films 1A and 1B. Further, since the release layer 12 contains a polyolefin resin and a polyalkylene oxide, not only the release property of the rice cake 13 is excellent, but also heat resistance due to heat sterilization and curling due to heating can be prevented. The releasable laminated films 1A and 1B according to the above embodiment have good releasability for foods and articles containing water such as tofu, in addition to the packaging of the rice cake 13 described above. , Has the heat sealability required when used as a package.

As described above, according to the releaseable laminated film according to the above embodiment, the surface of the release layer becomes hydrophilic due to the polyalkylene oxide having a high affinity with water contained in the release layer. Since a water film is formed on the surface of the release layer, the releasability is significantly improved as compared with the case where the release layer is provided with hydrophobicity. As a result, the contact angle of the release layer with water is significantly reduced, so that excellent releasability can be obtained even when the surface of the release layer comes into contact with food containing water. Then, sufficient heat-sealing property can be obtained by the polyolefin resin contained in the release layer. Therefore, it is possible to realize a releasable laminated film and a package having excellent releasability and heat sealability.

Hereinafter, the present invention will be described in more detail based on examples carried out to clarify the effects of the present invention. The present invention is not limited to the following examples and comparative examples.

(Example 1)
A polyamide resin (manufactured by BASF) was used as the base material layer. As the release layer, 97% by mass of polyolefin resin A (random polypropylene resin, made of prime polymer, melting point 148 ° C., MFR about 7.0 g / 10 minutes) and polyalkylene oxide A (polyethylene oxide, manufactured by Meisei Chemical Industry Co., Ltd., weight). An average molecular weight of 110,000) 3% by mass was blended and a dry blend was used. The resin of the base material layer and the resin of the release layer are co-extruded by the T-die method at a resin temperature of 250 ° C. using a single-screw extruder, and then rapidly cooled and formed with a cast roll at 50 ° C. A releasable laminated film as a stretched multilayer heat-sealing film was obtained. The contact angle, seal evaluation, releasability and haze of the obtained releasable laminated film were measured. The results are shown in Table 1 below.

(Example 2)
Implemented except that the polyolefin resin A was 99% by mass and 1% by mass of polyalkylene oxide B (polyethylene oxide, manufactured by Meisei Kagaku Kogyo Co., Ltd., weight average molecular weight 400,000 to 550,000) was used instead of polyalkylene oxide A. A releasable laminated film was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1 below.

(Example 3)
A releasable laminated film was prepared and evaluated in the same manner as in Example 2 except that 3% by mass of polyalkylene oxide B was used instead of polyalkylene oxide A. The results are shown in Table 1 below.

(Example 4)
A releasable laminated film was produced in the same manner as in Example 1 except that 3% by mass of polyalkylene oxide C (polyethylene oxide, manufactured by Meisei Kagaku Kogyo Co., Ltd., weight average molecular weight 3 million) was used instead of polyalkylene oxide A. And evaluated. The results are shown in Table 1 below.

(Example 5)
Release in the same manner as in Example 3 except that 97% by mass of polyolefin resin B (random polypropylene resin, manufactured by Japan Polypropylene Corporation, melting point 121 ° C., MFR about 7.0 g / 10 minutes) was used instead of polyolefin resin A. A mold-type laminated film was prepared and evaluated. The results are shown in Table 1 below.

(Example 6)
A releasable laminated film was prepared and evaluated in the same manner as in Example 3 except that 95% by mass of the polyolefin resin A was used and 5% by mass of the polyalkylene oxide B was used. The results are shown in Table 1 below.

(Example 7)
A releasable laminated film was prepared and evaluated in the same manner as in Example 3 except that 90% by mass of the polyolefin resin A was used and 10% by mass of the polyalkylene oxide B was used. The results are shown in Table 1 below.

(Example 8)
A releasable laminated film was prepared and evaluated in the same manner as in Example 3 except that 85% by mass of the polyolefin resin A was used and 15% by mass of the polyalkylene oxide B was used. The results are shown in Table 1 below.

(Example 9)
A releasable laminated film was prepared and evaluated in the same manner as in Example 3 except that 60% by mass of the polyolefin resin A was used and 40% by mass of the polyalkylene oxide B was used. The results are shown in Table 1 below.

(Example 10)
Releasable lamination as in Example 6 except that 5% by mass of polyalkylene oxide D (polyethylene oxide, manufactured by Meisei Chemical Industry Co., Ltd., weight average molecular weight 250,000 to 400,000) was used instead of polyalkylene oxide B. A film was prepared and evaluated. The results are shown in Table 1 below.

(Example 11)
Example 4 except that 97% by mass of polyolefin resin C (linear low density polyethylene (LLDPE) (manufactured by Prime Polymer Co., Ltd., melting point 123 ° C., MFR 2.1 g / 10 minutes) was used instead of polyolefin resin A). A releasable laminated film was prepared and evaluated in the same manner as in the above. The results are shown in Table 1 below.

(Comparative Example 1)
A releasable laminated film was prepared and evaluated in the same manner as in Example 1 except that 100% by mass of the polyolefin resin A was used and no polyalkylene oxide A was used. The results are shown in Table 1 below.

(Comparative Example 2)
A releasable laminated film was prepared in the same manner as in Example 1 except that 3% by mass of a surfactant (nonionic surfactant, manufactured by Toho Chemical Industry Co., Ltd., melting point 58 ° C.) was used instead of polyalkylene oxide A. And evaluated. The results are shown in Table 1 below.

(Comparative Example 3)
A releasable laminated film was prepared and evaluated in the same manner as in Comparative Example 2 except that 3% by mass of glycerin acid ester (manufactured by RIKEN Vitamin Co., Ltd.) was used instead of the surfactant. The results are shown in Table 1 below.

(Comparative Example 4)
A silicone-coated PET film (manufactured by Mitsubishi Plastics) was used as a releasable laminated film and evaluated in the same manner as in Example 1. The results are shown in Table 1 below.

(1) Measurement of contact angle The angle between the surface of the release layer and the surface of the droplet 20 seconds after dropping distilled water on the surface of the releasable laminated film was measured. Evaluation was performed based on the following criteria.
◯: Less than 90 degrees
×: 90 degrees or more

(2) Heat-sealing property The release properties of the obtained releasable laminated film are heat-sealed with a heat sealer under the conditions of 160 ° C., 3 kg / cm ² , and a sealing time of 2 seconds, and then placed on a strip with a width of 15 mm. I disconnected. In a 180 ° peeling test, peeling was performed at a peeling speed of 200 mm / min, and the peeling strength was measured and evaluated according to the following criteria.
◯: 1 kgf / 15 mm width or more Δ: 0.5 kgf / 15 mm width or more and less than 1 kgf / 15 mm width ×: 0.5 kgf / 15 mm width or less

(3) Release property The rice cake was placed on the release layer of the release property laminated film, wrapped, and then allowed to stand in a refrigerator for 6 hours. After allowing to stand for 6 hours, the releasable laminated film was taken out, and the adhesion of the mochi on the releasable layer when the mochi was peeled off from the releasable laminated film was evaluated according to the following criteria.
○: No rice cake adheres to the release layer ×: Mochi sticks on the release layer and the rice cake grows

(4) Internal haze The internal haze of the release layer was measured according to JIS K 7105.

As can be seen from Table 1, in the releasable laminated film according to the above embodiment, since the releasable layer contains a polyalkylene oxide and a polyolefin resin, the contact angle with water is 90 ° or less, and good releasability is achieved. In addition to having properties, it also had sufficient heat-sealing properties. On the other hand, in Comparative Examples 1, 2 and 4, none of them contained polyalkylene oxide and the contact angle with water was 90 ° or more, so that they were not hydrophilic and the releasability was deteriorated. In Comparative Example 3, the contact angle with water was 90 ° or less, but since it did not contain polyalkylene oxide, the releasability was insufficient. Further, since Comparative Example 4 was coated with silicone, the heat sealability was not exhibited.

The present invention has the effect of obtaining a releasable laminated film having excellent releasability by imparting hydrophilicity and also having the heat-sealing property required when used as a packaging material. For example, it can be suitably used as a packaging material for foods and articles containing water.

1 Releasable laminated film 11 Base material layer 12 Releasable layer 13 Mochi 21A, 21B Seal part

Claims (9)

Base layer and
A releasable laminated film provided on the base material layer and comprising a polyolefin resin and a releasable layer containing a polyalkylene oxide having a weight average molecular weight (Mw) of 10,000 or more and 6 million or less. .. The releasable laminated film according to claim 1, wherein the releasable layer has a contact angle with water of 90 ° or less. The releasable laminated film according to claim 1 or 2, wherein the release layer has a polyalkylene oxide content of 0.5% by mass or more and 50% by mass or less. The releasable laminated film according to any one of claims 1 to 3, wherein the release layer has a thickness of 1 μm or more and 100 μm or less. Any one of claims 1 to 4, wherein the base material layer contains at least one selected from the group consisting of a polyolefin resin, a polyamide resin, a polyester resin, and an ethylene vinyl acetate resin. The releasable laminated film according to. The releasable laminated film according to any one of claims 1 to 5, which is a coextruded film. The releasable laminated film according to any one of claims 1 to 5, which is a laminated film. A package containing the releasable laminated film according to any one of claims 1 to 7. The package according to claim 8, wherein the release layer is provided on the side to be packaged with respect to the base material layer.

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