JP6364749B2 - Laminated film, packaging material, and packaging bag - Google Patents

Description

  The present disclosure relates to a laminated film, a packaging material, and a packaging bag.

  JP 2001-247777 A (Patent Document 1) contains a surfactant having a viscosity of 100 to 1500 mPa · s measured at 25 ° C. in an amount of 0.1 to 20% by weight based on the entire resin composition. Disclosed is a resin composition capable of obtaining an antifogging film.

  Japanese Patent Application Laid-Open No. 2002-179812 (Patent Document 2) discloses a multilayer agricultural product having, as a surface layer, a single-layer agricultural film composed of a thermoplastic resin blended with an antifogging agent or a thermoplastic resin layer blended with an antifogging agent. An agricultural film is disclosed in which the antifogging agent forms a smooth layer on the film surface.

  Japanese Unexamined Patent Publication No. 2003-105112 (Patent Document 3) discloses an antifogging resin sheet whose surface is covered with a mixture of a polyglycerin fatty acid ester (A) and a diglycerin fatty acid ester (B).

  Japanese Patent Application Laid-Open No. 2008-239230 (Patent Document 4) is composed of a packaging material in which a heat sealant layer is formed inside a base film having water absorption and oxygen barrier properties, and the heat sealant layers are formed from each other. Disclosed is a bag for moisture-permeable packaging, characterized in that it is formed into a bag shape that is fused and leaves an opening as a whole and is closed on three sides.

Japanese Patent Application Laid-Open No. 2001-146291 (Patent Document 5) discloses a bag-like package using a single-layer or multilayer polymer film having a water vapor permeability of 20 g / m ² · 24 hr (40 ° C., 90% RH) or more. A fruit and vegetables freshness-keeping package is disclosed in which fruits and vegetables are sealed and packaged. The fruit and vegetable freshness-maintaining package is a single unit containing at least one of a polyester resin film, a polyamide resin film, a polyvinyl alcohol resin film, an ethylene vinyl alcohol copolymer resin film, and an ethylene vinyl acetate copolymer resin film. It is a layer or multilayer polymer film, the concentration of carbon dioxide gas in the package is high compared to the atmosphere and the oxygen concentration in the package is low compared to the atmosphere due to the respiration of the contents of the fruits and vegetables themselves, Moreover, it is disclosed that the weight loss of the entire package is less than 1% by weight per day.

JP 2001-247777 A JP 2002-179812 A JP 2003-105112 A JP 2008-239230 A JP 2001-146291 A

  However, when a content (for example, fruits and vegetables) having a high moisture content is packaged, dew condensation occurs on the inner surface of the package, the appearance deteriorates, and the contents (for example, fruits and vegetables) are damaged.

  Therefore, the present disclosure provides a laminated film capable of improving the antifogging property in one or a plurality of embodiments.

  In one or a plurality of embodiments, the present disclosure includes a base film layer (A) having water vapor permeability and a film layer (B) having antifogging property, and the film layer (B) is a surfactant. And at least one surface of the laminate film is coated with the surfactant.

  In one or a plurality of embodiments, the present disclosure relates to a packaging material including the laminated film of the present disclosure, or relates to a packaging bag including the laminated film of the present disclosure, in which the film layer (B) is the innermost layer.

  According to the present disclosure, in one or a plurality of embodiments, a laminated film capable of improving antifogging properties can be provided.

FIG. 1 shows an embodiment of a laminated film 10 comprising a base film layer (A) 1 having water vapor permeability, a film layer (B) 2 having antifogging properties, and an anchor coat layer (C) 3. FIG.

  The present disclosure is based on the knowledge that the antifogging effect can be exhibited while maintaining humidity by combining a base film layer having water vapor permeability and a film layer having antifogging properties into a laminated film. Further, the present disclosure has a structure in which the antifogging film layer of the laminated film contains a surfactant and the surface opposite to the base film layer is coated with the surfactant. This is based on the knowledge that the anti-fogging durability can be improved, the blocking of the laminated film can be suppressed, and the lowering (softening) of the film during moisture absorption can be reduced. In this disclosure, “becomes lower” or “was damaged” means, for example, that when a bag is formed with the laminated film according to the present disclosure and vegetables and other fruits and vegetables are packed, the film is soft. It means that the shape of the bag becomes unstable, such as sticking to fruits and vegetables.

  That is, in one aspect, the present disclosure includes a base film layer (A) having water vapor permeability and a film layer (B) having antifogging property, and the film layer (B) contains a surfactant. In addition, the present invention relates to a laminated film having at least one surface coated with the surfactant (hereinafter, also referred to as “laminated film of the present disclosure”). In one or a plurality of non-limiting embodiments, the laminated film of the present disclosure can maintain anti-fogging property, humidity, and shape for a long time when used as a package for moisture-rich fruits and vegetables. Can be seen clearly.

[Base film layer (A)]
The base film layer (A) is a resin film layer having water vapor permeability. “The base film layer (A) has water vapor permeability” means that, in one or a plurality of embodiments, 40 g / m ² · day (40 ° C., 90% RH) from the viewpoint of maintaining the antifogging property longer. ) Or more, more preferably 50 g / m ² · day (40 ° C., 90% RH) or more, even more preferably 60 g / m ² · day (40 ° C., 90% RH) or more, still more preferably 70 g / m. ² days (40 ° C, 90% RH) or more. Further, the water vapor permeability of the base film layer (A) is 400 g / m ² · from the point of maintaining the internal humidity when the laminated film of the present disclosure is formed into a bag shape in one or a plurality of embodiments. Day (40 ° C., 90% RH) or less is preferable, more preferably 300 g / m ² · day (40 ° C., 90% RH) or less, more preferably 200 g / m ² · day (40 ° C., 90% RH) or less. Even more preferably, it is 150 g / m ² · day (40 ° C., 90% RH) or less. Further, in one or a plurality of embodiments, the water vapor permeability of the base film layer (A) is to maintain the anti-fogging property longer and to reduce the internal humidity when the laminated film of the present disclosure is formed into a bag shape. From the standpoint of maintenance, it is preferably 40 g / m ² · day (40 ° C., 90% RH) or more and 400 g / m ² · day (40 ° C., 90% RH) or less, more preferably 50 g / m ² · day (40 ° C. 90% RH) to 300 g / m ² · day (40 ° C., 90% RH), more preferably 60 g / m ² · day (40 ° C., 90% RH) to 200 g / m ² · day (40 ° C., 90% RH) or less, even more preferably 70 g / m ² · day (40 ° C., 90% RH) or more and 150 g / m ² · day (40 ° C., 90% RH) or less. In addition, in this indication, "water vapor permeability" is measured according to JIS Z 0208, and is specifically measured by the method of the example described.

  In one or a plurality of embodiments, the base resin constituting the base film layer (A) satisfies the water vapor permeability. In one or a plurality of embodiments, the base resin is a non-stretched polypropylene (CPP), low Density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium / high density polyethylene (HDPE), ethylene / vinyl acetate copolymer (EVA), polystyrene (PS), biaxially oriented nylon (ONY), polyvinylidene chloride Coated stretched nylon (KON), unstretched nylon (CN), polyvinyl alcohol (PVA), ethylene vinyl alcohol copolymer (EVOH), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), cellophane (PT), poly Acrylonitrile (PAN), polyamide, polyester Ethylene terephthalate (PET), polylactic acid (PLA), copolyesters, etc.), those drawn Helsingborg carbonate, and these, as well as combinations thereof. The stretching includes uniaxial stretching and biaxial stretching. Among these, biaxially stretched nylon, biaxially stretched polystyrene, and biaxially stretched polylactic acid are preferable from the viewpoint of easy adjustment of water vapor permeability and good gloss and good appearance.

  The content of the base resin in the base film layer (A) is preferably 60% by weight or more, more preferably 90%, based on the total weight of the base film layer (A), from the viewpoint of maintaining the function as a base material. % By weight or more. Moreover, 95 weight% or less or 99 weight% or less is mentioned with respect to the total weight of a base film layer (A) from the same point as content of the said resin in a base film layer (A).

  In one or a plurality of embodiments, the base film layer (A) is used to adjust its water vapor permeability, such as zeolite, sepiolite, diatomaceous earth, silica gel, arobene, imogolite, montmorillonite, attapulgite, or zonotrite. Minerals (inorganic crystals) may be included. In addition, in one or a plurality of embodiments, the base film layer (A) includes, in addition to the resin, a thermal stabilizer, a lubricant, an antifogging agent, an impact resistance improving agent, a processing aid, an antistatic agent, and an ultraviolet ray. You may contain well-known additives, such as an absorber, antioxidant, a wrinkle-resistant deterioration inhibitor, an inorganic particle, a filler, and a pigment, in the range which does not impair the performance of a resin film.

  In one or more embodiments, the thickness of the base film layer (A) is preferably 15 μm or more, more preferably 20 μm or more, from the viewpoint of improving the strength of the laminated film of the present disclosure. In addition, in one or a plurality of embodiments, the thickness of the base film layer (A) is preferably 40 μm or less, more preferably 30 μm or less, from the viewpoint of economy and flexibility.

[Film layer having antifogging property (B)]
The film layer (B) having anti-fogging property has a configuration in which a surfactant is contained and at least one surface is coated with the surfactant. In one or a plurality of embodiments, the surfactant coat is formed from a mixture containing the base resin of the film layer (B) and the surfactant from the viewpoint of improving the antifogging durability and suppressing the blocking. It is preferably formed of a surfactant bleed out from the resin layer to the surface.

  Therefore, in another aspect, the present disclosure includes a base film layer (A) having water vapor permeability and a film layer (B) having antifogging property, and the film layer (B) is a surfactant. The present invention relates to a laminated film which is a film layer formed using a mixture with a resin. Hereinafter, unless otherwise specified, the laminated film of this embodiment is also referred to as “the laminated film of the present disclosure”.

  In the laminated film of the present disclosure, the film layer (B) is arranged or configured so that the surface of the film layer (B) coated with a surfactant is in contact with a space where antifogging properties are desired. In one or a plurality of non-limiting embodiments, when the laminated film of the present disclosure is used as a package for fruits and vegetables, the innermost layer is the film layer (B), and the inner surface thereof is coated with a surfactant. FIG. 1 is a schematic view of a laminated film 10 that is a non-limiting embodiment of the laminated film of the present disclosure. The laminated film 10 has a structure in which an antifogging film layer (B) 2 is laminated on a base film layer (A) 1 via an anchor coat layer (C) 3. In this configuration, although not shown, a surfactant coat is formed on the upper surface of the antifogging film layer (B) 2.

  The base resin constituting the film layer (B) is a thermoplastic resin in one or a plurality of embodiments. As the thermoplastic resin, in one or a plurality of embodiments, ethylene-vinyl alcohol copolymer (EVOH), vinyl chloride-vinyl alcohol-vinyl acetate copolymer, styrene resin, acrylic resin, ester resin, olefin resin, chloride Examples include vinyl resins, polyamide resins, ethylene / vinyl acetate copolymers (EVA), and combinations thereof. Among these, EVOH is preferable from the viewpoint of blocking prevention.

[Surfactant]
In one or more embodiments, the surfactant contained in the film layer (B) is preferably a nonionic antifogging agent from the viewpoint of exhibiting antifogging properties. Examples of the surfactant that is a nonionic antifogging agent include polyhydric alcohol fatty acid esters, polyoxyethylene compounds, and combinations thereof in one or more embodiments. Among these, a polyhydric alcohol fatty acid ester is preferable from the viewpoint of exhibiting more antifogging properties. Moreover, as polyhydric alcohol fatty acid ester, in one or some embodiment, polyglycerol fatty acid ester (a), diglycerol fatty acid ester (b), and these combination are mentioned. Among these, it is preferable to use a combination of polyglycerin fatty acid ester (a) and diglycerin fatty acid ester (b) as a surfactant that is an antifogging agent from the viewpoint of more exhibiting antifogging properties.

[Polyglycerin fatty acid ester (a)]
As polyglyceryl fatty acid ester (a), in one or a plurality of embodiments, 70% by weight or more of the constituent fatty acid is a saturated and / or unsaturated fatty acid having 12 to 18 carbon atoms, preferably 12 to 16 carbon atoms, preferably saturated. It is a fatty acid. Further, those having a polycondensation degree of 4 to 20 and a monoester of 50 mol% or more are preferred. Specific examples of the constituent fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, aragydic acid, oleic acid, elaidic acid, ricinoleic acid, 2-butyloctanoic acid, 2-hydroquindecanoic acid and the like. More specifically, it is preferable to contain lauric acid, myristic acid, palmitic acid alone or two or more of 70% by weight or more of the total constituent fatty acids, and the remainder is 10 carbon atoms or less such as capric acid or caprylic acid and / or Alternatively, it may contain a saturated fatty acid having 18 or more carbon atoms such as stearic acid or arachidic acid, or an unsaturated fatty acid such as myristoleic acid, palmitoleic acid or oleic acid.

  As a polyglycerol fatty acid ester (a), decaglycerol laurate is mentioned in one or some embodiment.

[Diglycerin fatty acid ester (b)]
As the diglycerin fatty acid ester (b), in one or a plurality of embodiments, 70% by weight or more of the constituent fatty acid is a saturated and / or unsaturated fatty acid having 12 to 18 carbon atoms, preferably 12 to 16 carbon atoms, preferably saturated. It is a fatty acid. Further, those having a polycondensation degree of 2 and a monoester of 80 mol% or more are preferred. Here, it is more preferable to increase the monoester ratio to 90 mol% or more by distillation or the like. Specific examples of the constituent fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, aragydic acid, oleic acid, elaidic acid, ricinoleic acid, 2-butyloctanoic acid, 2-hydroquindecanoic acid and the like. More specifically, it is preferable to contain lauric acid, myristic acid, palmitic acid alone or two or more of 70% by weight or more of the total constituent fatty acids, and the remainder is 10 carbon atoms or less such as capric acid or caprylic acid and / or Alternatively, it may contain a saturated fatty acid having 18 or more carbon atoms such as stearic acid or arachidic acid, or an unsaturated fatty acid such as myristoleic acid, palmitoleic acid or oleic acid.

  Examples of the diglycerin fatty acid ester (b) include diglycerin laurate and diglycerin oleate in one or more embodiments.

  When the polyglycerin fatty acid ester (a) and the diglycerin fatty acid ester (b) are used in combination as the surfactant, the mixing ratio a / b (weight ratio) is the initial antifogging property in one or more embodiments. From the viewpoint of maintaining the improvement and antifogging property, 1/99 or more, 1.5 / 98.5 or more, or 2/98 or more can be mentioned. In one or a plurality of embodiments, the mixing ratio a / b (weight ratio) is 20/80 or less, 10/90 or less, 7/93 or less, or 5/95 or less from the same viewpoint. .

  In one or a plurality of embodiments, the content of the surfactant in the film layer (B) is 0.2% by weight or more based on the resin of the film layer (B) from the viewpoint of maintaining the antifogging property. 5 weight% or more, or 0.6 weight% or more is mentioned. Moreover, content of surfactant in a film layer (B) is 10 weight% or less with respect to resin of a film layer (B), and 8.0 weight% from a viewpoint of blocking prevention in one or some embodiment. Hereinafter, 5.0 weight% or less, or 4.0 weight% or more is mentioned.

  The content of the base resin in the film layer (B) is preferably 90% by weight or more, more preferably 95% by weight or more, based on the total weight of the film layer (B), from the viewpoint of exhibiting and maintaining the antifogging function. It is. Moreover, 90 weight% or less or 95 weight% or less is mentioned with respect to the total weight of a film layer (B) from content similar to content of the said resin in a base film layer (A).

  In one or a plurality of embodiments, the film layer (B) is a zeolite, sepiolite, diatomaceous earth, silica gel, arobene, imogolite, montmorillonite, attapulgite, or zonotrite for the purpose of adjusting its water vapor permeability and water contact angle. Such a mineral (inorganic crystal) may be contained. In addition, in one or a plurality of embodiments, the film layer (B) includes, in addition to the resin, a thermal stabilizer, a lubricant, an antifogging agent, an impact resistance improving agent, a processing aid, an antistatic agent, and an ultraviolet absorber. Moreover, you may contain well-known additives, such as antioxidant, an anti-wrinkle deterioration inhibitor, an inorganic particle, a filler, and a pigment, in the range which does not impair the performance of a resin film.

  In one or more embodiments, the thickness of the film layer (B) is preferably 0.2 μm or more, more preferably 0.3 μm or more, and still more preferably 0, from the viewpoint of improving the antifogging property of the laminated film of the present disclosure. .4 μm or more, more preferably 0.6 μm or more. In addition, in one or a plurality of embodiments, the thickness of the base film layer (A) is preferably 5.0 μm or less, more preferably 4.0 μm or less, and still more preferably 3. It is 0 μm or less, more preferably 2.0 μm or less.

  The water contact angle of one surface of the film layer (B), that is, the surface coated with the surfactant, is 0 ° or more and 50 ° or less from the viewpoint of exhibiting antifogging properties in one or more embodiments. More preferably, it is 0 degree or more and 40 degrees or less, More preferably, it is 0 degree or more and 30 degrees or less. In the present disclosure, “water contact angle” is measured with a contact angle meter (using DM-SA manufactured by Kyowa Interface Science Co., Ltd., 7 seconds after 2.0 μL of water is deposited on the film) It is measured by the method of the embodiment specifically described.

[Anchor coat layer (C)]
In one or more embodiments, the laminated film of the present disclosure preferably includes an anchor coat layer (C) from the viewpoint of preventing peeling of the antifogging film layer (B) (see FIG. 1). Examples of the material for forming the undercoat layer include urethane, titanate, imine, butadiene, polyester, and olefin.

Coating amount of the anchor coat layer (C), in one or more embodiments, in terms of the anchor effect, preferably 0.001 g / m ² or more, more preferably 0.005 g / m ² or more, more preferably 0 0.010 g / m ² or more. The thickness of the base film layer (A), in one or more embodiments, from the viewpoint of preventing dew condensation effects, preferably 0.040 g / m ² or less, more preferably 0.030 g / m ² or less, further Preferably it is 0.010 g / m ² or less.

In one or more embodiments of the laminated film of the present disclosure, when the mass of the anchor coat layer (C) is C and the mass of the film layer (B) is B, the antifogging performance and sustainability, ease of manufacture, And it is preferable to satisfy | fill all the following three formulas from the point of peeling suppression of a film layer (B).
C ≦ 0.03 (g / m ² )
B ≧ 0.40 (g / m ² )
210 ≧ B / C ≧ 13

  In one or more embodiments of the laminated film of the present disclosure, the layers (A), (B), and (C) may be each independently a single layer or may be a laminate of a plurality of layers. . Moreover, the laminated film of this indication WHEREIN: In one or some embodiment, layers other than a layer (A), a layer (B), and a layer (C) may be laminated | stacked.

[Water vapor permeability of laminated film]
In one or a plurality of embodiments, the water vapor permeability of the laminated film of the present disclosure is preferably 40 g / m ² · day (40 ° C., 90% RH) or more, more preferably, from the viewpoint of maintaining the antifogging property longer. Is 50 g / m ² · day (40 ° C., 90% RH) or more, more preferably 60 g / m ² · day (40 ° C., 90% RH) or more. Moreover, the water vapor permeability of the base film layer (A) is 250 g / m ² · from the point of maintaining the internal humidity when the laminated film of the present disclosure is formed into a bag shape in one or a plurality of embodiments. Day (40 ° C., 90% RH) or less, preferably 180 g / m ² · day (40 ° C., 90% RH) or less, more preferably 150 g / m ² · day (40 ° C., 90% RH) or less It is. Further, in one or a plurality of embodiments, the water vapor permeability of the base film layer (A) is to maintain the anti-fogging property longer and to reduce the internal humidity when the laminated film of the present disclosure is formed into a bag shape. From the standpoint of maintenance, it is preferably 40 g / m ² · day (40 ° C., 90% RH) or more and 250 g / m ² · day (40 ° C., 90% RH) or less, more preferably 40 g / m ² · day (40 ° C. 90% RH) to 180 g / m ² · day (40 ° C., 90% RH), more preferably 50 g / m ² · day (40 ° C., 90% RH) to 180 g / m ² · day (40 ° C., 90% RH) or less, even more preferably 60 g / m ² · day (40 ° C., 90% RH) or more and 150 g / m ² · day (40 ° C., 90% RH) or less.

[Haze of laminated film]
In one or more embodiments, the haze of the laminated film of the present disclosure is 2.0% or more, 3.0% or more, 4.0% or more, 5.0% or more from the viewpoint of the visibility of the film, It is 9.0% or less, 8.0% or less, 7.0% or less, or 6.0% or less from the point of appearance (the contents are clearly visible). In the present disclosure, “haze” is the ratio of scattered light to the total transmitted light, and is specifically measured by the method of the embodiment described.

[Packaging]
In another aspect, the present disclosure relates to a packaging material including the laminated film of the present disclosure. The packaging material of this indication is processed into a packaging bag and a package in one or a plurality of non-limiting embodiments.

[Packaging bags and packages]
In another aspect, the present disclosure relates to a packaging bag including the laminated film of the present disclosure, wherein the film layer (B) is an innermost layer. The packaging bag of this indication can be used as a packaging bag of articles, such as fruit and vegetables, in one or a plurality of non-limiting embodiments, and can form a package consisting of the article and a packaging bag for packaging the article. In other embodiments, the present disclosure may also relate to the package.

The present disclosure further relates to one or more of the following embodiments.
<1> A laminated film comprising a substrate film layer (A) having water vapor permeability and a film layer (B) having antifogging properties, wherein the film layer (B) contains a surfactant, and The laminated film in which the surface opposite to the surface on which the base film layer (A) of the film layer (B) is laminated is coated with the surfactant.
<2> A laminated film comprising a substrate film layer (A) having water vapor permeability and a film layer (B) having antifogging properties, wherein the film layer (B) comprises a surfactant and a resin. A laminated film or a laminated film according to <1>, which is a film layer formed using a mixture.
<3> The laminated film according to <1> or <2>, wherein the base film layer (A) and the film layer (B) are laminated via the anchor coat layer (C).
<4> The water vapor permeability of the laminated film is 40 g / m ² · day (40 ° C., 90% RH) or more and 180 g / m ² · day (40 ° C., 90% RH) or less, from <1> to <3> The laminated film according to any one of the above.
<5> The laminated film according to any one of <1> to <4>, wherein a water contact angle on one surface of the film layer (B) is 0 ° or more and 50 ° or less.
<6> The laminated film according to any one of <1> to <5>, wherein the haze of the laminated film is 5.0 or more and 7.0% or less.
<7> The laminated film according to any one of <1> to <6>, wherein the base film layer (A) has a thickness of 15 μm or more and 40 μm or less.
<8> The laminated film according to any one of <1> to <7>, wherein the film layer (B) has a thickness of 0.3 μm or more and 4.0 μm or less.
<9> The resin constituting the film layer (B) is an ethylene-vinyl alcohol copolymer (EVOH), a vinyl chloride-vinyl alcohol-vinyl acetate copolymer, a styrene resin, an acrylic resin, an ester resin, an olefin resin, The laminated film according to any one of <1> to <8>, comprising a resin selected from the group consisting of vinyl chloride resins and combinations thereof.
<10> The laminated film according to any one of <1> to <9>, wherein the surfactant of the film layer (B) is a nonionic antifogging agent.
<11> The surfactant of the film layer (B) is at least two selected from the group consisting of polyhydric alcohol fatty acid esters, polyoxyethylene compounds, and combinations thereof, <1> to <10> A laminated film according to any one of the above.
<12> The laminated film according to any one of <1> to <11>, wherein the surfactant of the film layer (B) contains a polyglycerol fatty acid ester (a) and a diglycerol fatty acid ester (b).
<13> The content of the surfactant in the film layer (B) is from 0.5% by mass to 4.0% by mass with respect to the resin content of the film layer (B), from <1> to <12 > The laminated film according to any one of the above.
<14> The base film layer (A) is a film selected from the group consisting of a polystyrene film, a polyester film, a nylon 1 film, an ethylene-vinyl alcohol copolymer, and a combination thereof. <1> to <13 > The laminated film according to any one of the above.
<15> When the mass of the anchor coat layer (C) is C and the mass of the film layer (B) is B, the laminated film according to any one of <1> to <14> satisfying all of the following three formulas: .
C ≦ 0.03 (g / m ² )
B ≧ 0.40 (g / m ² )
210 ≧ B / C ≧ 13
<16> A packaging material comprising the laminated film according to any one of <1> to <15>.
<17> A packaging bag comprising the laminated film according to any one of <1> to <15>, wherein the film layer (B) is an innermost layer.

  The present disclosure will be described in more detail by way of examples, but this is merely an example, and the present disclosure is not limited thereto.

[Production of laminated film]
The laminated films (X) of Examples 1 to 24 and Comparative Examples 1 to 5 were produced as follows.
Example 1
The coating amount after drying on a biaxially stretched nylon film (emblem ONBC-25, Unitika, water vapor permeability 110 g / m ² · day) with a thickness of 25 μm, which is corona-treated on both sides of the base film layer (A) After coating with Titabond T-180E (polybutadiene, Nippon Soda) as a anchor coat layer (C) so as to be 0.008 g / m ² with a guavia coater, it was immediately dried at 100 ° C. for 15 seconds.
Further, ethylene-vinyl of 29 mol% ethylene content dispersed in this anchor coat layer (C) in a dispersion medium (mixed solution of 50 parts of n-propanol and 50 parts of water) so that the solid content is 13.3% by weight. Alcohol copolymer (EVOH) (Soarnol 16DX (solid content 16% by weight diluted), Nippon Synthetic Chemical Industry Co., Ltd.), 3.5% by weight surfactant (diglycerin laurate (EV) Riquemar L-71-D, RIKEN VITAMIN) 95 parts by weight and decaglycerin laurate (Poem J-0021, RIKEN VITAMIN) 5 parts by weight) was added and stirred to prepare a uniform solution. After coating with a gravure coater so that the work amount was 1.0 g / m ² , the film layer (B) was formed by quickly drying at 100 ° C. for 15 seconds. The total thickness of the produced film (X) was 25.8 μm. In addition, the coating agent coating amount (g / m ² ) after drying when the biaxially stretched PET film having a thickness of 25 μm is coated under the same conditions as those for coating the base film layer (A) is a microchemical scale (0. The thickness of the film layer (B) was determined by dividing the coating amount by the specific gravity of the coating agent resin. The total thickness of the film (X) was determined as the sum of the thickness of the film layer (B) and the thickness of the base film layer (A) (the same applies hereinafter).

(Example 2)
A film was prepared and evaluated in the same manner as in Example 1 except that the addition amount of the surfactant was changed to 2.5% by weight. The total thickness of the produced film (X) was 25.8 μm.
(Example 3)
A film was prepared and evaluated in the same manner as in Example 1 except that the addition amount of the surfactant was changed to 2% by weight. The total thickness of the produced film (X) was 25.8 μm.
Example 4
A film (X) was produced and evaluated in the same manner as in Example 1 except that the addition amount of the surfactant was changed to 0.6% by weight. The total thickness of the produced film (X) was 25.8 μm.
(Example 5)
A film (X) was produced and evaluated in the same manner as in Example 1 except that the addition amount of the surfactant was changed to 0.3% by weight. The total thickness of the produced film (X) was 25.8 μm.
(Example 6)
The surfactant is a mixture of 98 parts by weight of diglycerin laurate and 2 parts by weight of decaglycerol laurate, the added amount of the surfactant is 3.3% by weight, and the film layer (A) after drying is coated A film (X) was prepared and evaluated in the same manner as in Example 1 except that the amount was 3.2 g / m ² . The total thickness of the produced film (X) was 27.6 μm.
(Example 7)
A film (X) was produced and evaluated in the same manner as in Example 6 except that the coating amount of the dried film layer (B) was 1.9 g / m ² . The layer thickness of the produced film (X) was 26.6 μm.
(Example 8)
A film (X) was produced and evaluated in the same manner as in Example 6 except that the coating amount of the dried film layer (B) was 0.9 g / m ² . The layer thickness of the produced film (X) was 25.7 μm.
Example 9
A film (X) was produced and evaluated in the same manner as in Example 6 except that the coating amount of the dried film layer (B) was 0.4 g / m ² . The layer thickness of the produced film (X) was 25.3 μm.
(Example 10)
A film (X) was produced and evaluated in the same manner as in Example 6 except that the coating amount of the dried film layer (B) was 5.4 g / m ² . The layer thickness of the produced film (X) was 29.5 μm.
(Example 11)
A film (X) was produced in the same manner as in Example 1 except that the base film layer (A) was biaxially stretched polystyrene (OPS film GM, Asahi Kasei, water vapor permeability 119 g / m ² · day) having a thickness of 30 μm. Evaluation was performed. The layer thickness of the produced film (X) was 31 μm.
(Example 12)
Film (X) as in Example 1 except that the base film layer (A) is a 25 μm thick biaxially stretched polylactic acid film (Pal Green LC, Mitsui Chemicals Tosero, water vapor permeability 240 g / m ² · day) Were made and evaluated. The thickness of the produced film (X) was 25.8 μm.
(Example 13)
A film (X) as in Example 1 except that the base film layer (A) is a biaxially stretched polyethylene terephthalate film (Lumirror (P60), Toray film processing, water vapor permeability 50 g / m ² · day) having a thickness of 12 μm. ) And evaluated. The thickness of the produced film (X) was 12.8 μm.
(Example 14)
A film (X) was prepared in the same manner as in Example 1 except that the base film layer (A) was a biaxially stretched EVOH film (Eval film EF-CR, Kuraray, water vapor permeability 101 g / m ² · day) having a thickness of 25 μm. It produced and evaluated. The thickness of the produced film (X) was 25.8 μm.
(Example 15)
A film (X) was produced and evaluated in the same manner as in Example 1 except that the anchor coat layer was not provided. The thickness of the produced film (X) was 25.8 μm.
(Example 16)
A film (X) was produced and evaluated in the same manner as in Example 7 except that the coating amount of the anchor coat layer (C) was 0.002 g / m ² . The total thickness of the produced film (X) was 26.6 μm.
(Example 17)
A film (X) was produced and evaluated in the same manner as in Example 7 except that the coating amount of the anchor coat layer (C) was 0.011 g / m ² . The total thickness of the produced film (X) was 26.6 μm.
(Example 18)
A film (X) was produced and evaluated in the same manner as in Example 7 except that the coating amount of the anchor coat layer (C) was 0.017 g / m ² . The total thickness of the produced film (X) was 26.6 μm.
(Example 19)
Film as in Example 7 except that the coating amount of the dried film layer (B) is 0.5 g / m ² and the coating amount of the anchor coat layer (C) is 0.004 g / m ^2. (X) It produced and evaluated. The total thickness of the produced film (X) was 25.4 μm.
(Example 20)
A film (X) was prepared and evaluated in the same manner as in Example 17 except that the coating amount of the dried film layer (B) was 0.3 g / m ² . The total thickness of the produced film (X) was 25.2 μm.
(Example 21)
A film (X) was prepared in the same manner as in Example 1 except that the surfactant was a mixture of 95 parts by weight of diglycerin oleate and 5 parts by weight of decaglycerol laurate (Riquemar O-71-DE, RIKEN vitamin). Evaluation was performed. The total thickness of the produced film (X) was 25.8 μm.
(Example 22)
A film (X) was produced and evaluated in the same manner as in Example 1 except that the thickness of the base film (A) was 50 μm. The total thickness of the produced film (X) was 50.8 μm.
(Example 23)
A film (X) was produced and evaluated in the same manner as in Example 1 except that the surfactant was diglycerin laurate and 7 wt% was added to EVOH. The total thickness of the produced film (X) was 25.8 μm.
(Example 24)
A film (X) was produced in the same manner as in Example 1 except that the film layer (A) was a vinyl chloride-vinyl alcohol-vinyl acetate copolymer (92: 3: 5) (Solvine A, Nissin Chemical Industry). The evaluation was conducted. The total thickness of the produced film (X) was 25.8 μm.
(Comparative Example 1)
A film (X) was produced and evaluated in the same manner as in Example 1 except that the surfactant was not added.
(Comparative Example 2)
A film (X) was produced in the same manner as in Example 1 except that the base film (A) was a biaxially stretched polypropylene film (pyrene film-OT P2108, water vapor permeability 4 g / m ² · day) having a thickness of 30 μm. The evaluation was conducted. The thickness of the produced film (X) was 31 μm.
(Comparative Example 3)
The base film (A) is a biaxially stretched polypropylene film (pyrene film-OT P2108, water vapor permeability 4 g / m ² · day) having a thickness of 30 μm, and the surfactant is sorbitan trioleate (Riquemar OR-85, RIKEN). Vitamin), the amount added is 12.3% by weight, and the film (X) is produced in the same manner as in Example 1 except that the amount of the anchor coat layer (C) applied is 0.05 g / m ^2. And evaluated. The total thickness of the produced film (X) was 30.8 μm.
(Comparative Example 4)
Evaluation was carried out in the same manner as in Example 1 except that the anchor coat layer (C) and the film layer (B) were not provided on the film layer (A). The thickness of the produced film (X) was 25 μm.
(Comparative Example 5)
Evaluation was carried out in the same manner as in Example 1 except that the film layer (A) was directly coated with diglycerin oleate at 100 mg / m ² . The thickness of the produced film (X) was 25 μm.

[Evaluation of laminated film]
About the produced laminated films (X) of Examples 1 to 24 and Comparative Examples 1 to 5, haze, contact angle, water vapor permeability, condensation, visibility of the contents (fruits and vegetables) at the time of condensation evaluation, blocking, and The shape of the package was evaluated under the following conditions.

[Measurement method of haze]
The haze (cloudiness) of the laminated film (X) was measured using a turbidity and cloudiness system (Nippon Denshoku Industries Co., Ltd., NDH2000) (JIS K 7136). The results are shown in Table 1.

[Measurement method of contact angle]
The contact angle of water on the surface of the film layer (B) of the laminated film (X) was determined by a droplet method using a contact angle meter (Kyowa Interface Science Co., Ltd., DM-501) (2 μL of purified water on the film measurement surface). The contact angle was 7 seconds after dropping, and was measured at 10 points at 5 cm intervals. The results are shown in Table 1.

[Measurement method of water vapor permeability]
The water vapor permeability of the laminated film (X) was measured according to JIS Z 0208 (40 ° C., 90% RH). The results are shown in Table 1.

[Method for evaluating condensation]
Using the laminated film (X), a packaging bag having an inner size of 130 × 180 mm is prepared so that the film layer (B) is on the inside, and then 100 g of shiitake is put into the packaging bag and the opening is sealed with a heat seal. Thus, a shiitake package was obtained.
First, this package was stored at 25 ° C. for 1 hour to stabilize the temperature of the package, then transferred to a refrigerator having an internal temperature of 10 ° C., and then stored for 5 days.
The degree of cloudiness of the packaging bag was observed from the start of storage in the refrigerator to immediately after storage (after 30 minutes), 1 day, 3 days and 5 days, and evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: Good B: Somewhat good C: Bad D: Remarkably bad Table 1 shows the evaluation results.

[Evaluation method for visibility of contents (Shiitake)]
Using the laminated film (X), a packaging bag having an inner size of 130 × 180 mm is prepared so that the film layer (B) is on the inside, and then 100 g of shiitake is put into the packaging bag and the opening is sealed with a heat seal. Thus, a shiitake package was obtained.
First, this package was stored at 25 ° C. for 1 hour to stabilize the temperature of the package, then transferred to a refrigerator having an internal temperature of 10 ° C., and then stored for 5 days.
From the start of storage in the refrigerator, immediately after storage (after 30 minutes), 1 day, 3 days and 5 days later, the visibility of shiitake mushrooms was observed and evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: Good throughout the storage period B: Almost good throughout the storage period C: Almost bad throughout the storage period D: Bad throughout the storage period These evaluation results are shown in Table 1.

[Quality evaluation method for fruits and vegetables]
Using the laminated film (X), a packaging bag having an inner size of 130 × 180 mm is prepared so that the film layer (B) is on the inside, and then 100 g of shiitake is put into the packaging bag and the opening is sealed with a heat seal. Thus, a shiitake package was obtained.
First, this package was stored at 25 ° C. for 1 hour to stabilize the temperature of the package, then transferred to a refrigerator having an internal temperature of 10 ° C., and then stored for 5 days.
The change to the dark brown of the part which the condensed water 5 days after the storage start by a refrigerator contacted the shiitake mushroom was observed, and it evaluated according to the evaluation criteria shown below.
(Evaluation criteria)
A: No change in dark brown B: Change in dark brown These evaluation results are shown in Table 1.

[Evaluation of blocking]
Using the laminated film (X), a packaging bag having an inner size of 130 × 180 mm is prepared so that the film layer (B) is on the inside, and then 100 packaging bags are bundled and sandwiched between plywoods to be horizontal. The sample was placed on a table, and a weight was placed on the top plywood so that the bag was loaded with a plywood together with the plywood and stored at 25 ° C. for 1 week.
The ease of opening the bag after storage was confirmed and evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: Blocking was suppressed (the bag opening was easy to open).
B: Slightly blocking (the bag opening was somewhat difficult to open).
C: Obviously blocking (bag opening is difficult to open).
The evaluation results are shown in Table 1.

[Evaluation method of film waist (shape of package)]
Using the laminated film (X), a packaging bag having an inner size of 130 × 180 mm is prepared so that the film layer (B) is on the inside, and then 100 g of shiitake is put into the packaging bag and the opening is sealed with a heat seal. Thus, a shiitake package was obtained.
First, this package was stored at 25 ° C. for 1 hour to stabilize the temperature of the package, then transferred to a refrigerator having a temperature of 10 ° C., and then stored for 1 day.
The state of the packaging bag immediately after taking out from the refrigerator was observed and evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: The shape of the package is maintained. B: The film is softened and the shape of the package is broken. Table 1 shows the evaluation results.

See below for other columns in Table 1.
* 1 The film layer (B) is difficult to dry.
* 2 Haze is slightly bad.
* 3 After 5 days, shiitake is slightly moistened.
* 4 The film layer (B) is easy to peel off.
* 5 The film layer (B) is slightly peeled off.
* 6 Price (cost) is high.
* 7 The film layer (B) is easy to peel off.
* 8 The film layer (B) is easy to peel off. Haze is slightly bad.

  As shown in Table 1, the laminated films (X) of Examples 1 to 24 were superior in antifogging properties (dew condensation suppression) as compared to Comparative Examples 1 to 5.

Claims (15)

A laminated film comprising a substrate film layer (A) having water vapor permeability and a film layer (B) having antifogging properties, wherein the film layer (B) contains a surfactant and the film The surface of the layer (B) opposite to the surface on which the base film layer (A) is laminated is coated with the surfactant,
The water vapor permeability of the laminated film is 40 g / m ² · day (40 ° C., 90% RH) or more and 180 g / m ² · day (40 ° C., 90% RH) or less,
As the surfactant , a polyglycerin fatty acid ester (a) having a degree of polycondensation of 4 to 20 and a diglycerin fatty acid ester (b) having a weight ratio (a / b) of 1/99 or more, 5/95 Laminated film contained below. A laminated film comprising a substrate film layer (A) having water vapor permeability and a film layer (B) having antifogging properties, wherein the film layer (B) uses a mixture of a surfactant and a resin. A film layer formed by
The water vapor permeability of the laminated film is 40 g / m ² · day (40 ° C., 90% RH) or more and 180 g / m ² · day (40 ° C., 90% RH) or less,
As the surfactant , a polyglycerin fatty acid ester (a) having a degree of polycondensation of 4 to 20 and a diglycerin fatty acid ester (b) having a weight ratio (a / b) of 1/99 or more, 5/95 Laminated film contained below.   The laminated film according to claim 1 or 2, wherein the base film layer (A) and the film layer (B) are laminated via the anchor coat layer (C).   The laminated film according to any one of claims 1 to 3, wherein a water contact angle on one surface of the film layer (B) is 0 ° or more and 50 ° or less.   The laminated film according to any one of claims 1 to 4, wherein the laminated film has a haze of 5% or more and 7% or less.   The laminated film according to any one of claims 1 to 5, wherein the base film layer (A) has a thickness of 15 µm or more and 40 µm or less.   The laminated film according to any one of claims 1 to 6, wherein the film layer (B) has a thickness of 0.3 µm or more and 4.0 µm or less.   The resin constituting the film layer (B) is ethylene-vinyl alcohol copolymer (EVOH), vinyl chloride-vinyl alcohol-vinyl acetate copolymer, styrene resin, acrylic resin, ester resin, olefin resin, vinyl chloride resin. And a laminated film according to any one of claims 1 to 7, comprising a resin selected from the group consisting of a combination thereof.   The laminated film according to any one of claims 1 to 8, wherein the surfactant of the film layer (B) is a nonionic antifogging agent. The laminated film according to any one of claims 1 to 9 , wherein the surfactant of the film layer (B) contains a polyglycerol fatty acid ester (a) and a diglycerol fatty acid ester (b). The content of the surfactant in the film layer (B) is not less than 0.5 mass% 4.0 mass% or less with respect to the resin content of the film layer (B), in any one of claims 1 to 10 The laminated film as described. The base film layer (A), a polystyrene film, a polyester film, a nylon film, an ethylene - a film selected from vinyl alcohol copolymer, and combinations thereof comprising the group, according to any of claims 1 to 11 Laminated film. The laminated film according to claim 3, wherein all of the following three formulas are satisfied, where C is the mass of the anchor coat layer (C) and B is the mass of the film layer (B).
C ≦ 0.03 (g / m ² )
B ≧ 0.40 (g / m ² )
210 ≧ B / C ≧ 13 Comprising a laminated film according to claim 1 to 13, packaging material. A packaging bag comprising the laminated film according to any one of claims 1 to 13 , wherein the film layer (B) is an innermost layer.

Images