JP2019177919A - Odor adsorption sealant film and package bag and packaging material and package formed of the odor adsorption sealant film - Google Patents

Abstract

To provide a packaging material, a package, and a BIB liquid content package formed of an odor adsorption sealant film which can exhibit high adsorption effect to odor generated by decomposition of a resin forming a sealant film for deodorization, in which odor adsorption ability is not deteriorated, which can exhibit high adsorption effect for long term, and which is excellent in odor change resistance to a content, excellent in pinhole resistance to rubbing in transport, and excellent in leakage resistance of the content.SOLUTION: An odor adsorption sealant film 1 comprises an outer layer film 3 and an inner layer film 4, the outer and inner layer films are partially adhered mutually, a sealant layer of the inner layer film includes an odor adsorption layer, the odor adsorption layer includes a low elution polyethylene and an odor adsorption body, the odor adsorption body includes a hydrophobic zeolite, and a content of the hydrophobic zeolite in the sealant layer is 0.1 mass% or more and 13 mass% or less.SELECTED DRAWING: Figure 2

Description

  The present invention is excellent in pinhole resistance, an elution organic substance originally contained in the packaging material, and an odor component generated from the sealant film during the sterilization and sterilization treatment in the liquid content in the package. Prevents the contents from changing and giving odors to the contents. Excellent sealant film with excellent odor resistance, and packaging materials and packages made from the odor-adsorbing sealant film, especially BIB (Bag In Box) liquid content packaging.

As a packaging material, a packaging material containing an odor adsorbent that adsorbs an odor has been proposed (Patent Document 1). In such a packaging material, an odor adsorbent such as synthetic zeolite or activated carbon is kneaded into the resin material.
However, since such a packaging material has a problem of adsorbing not only odor but also moisture in the atmosphere and desorbing the odor once adsorbed, a sufficient odor adsorption effect can be obtained. Not.

  Although a packaging material containing an odor adsorbent obtained by supporting a chemical adsorbent on an inorganic porous material is also known (Patent Document 2), the main adsorption object adsorbs an odor component having a specific functional group. However, in the situation where no resin material is selected, the generation amount of organic substances having no functional group cannot be suppressed, and the odor component cannot be sufficiently adsorbed.

  Furthermore, the BIB liquid contents packing bag filled with liquid contents is easy to cause pinholes in the package due to rubbing during transportation, etc., and is durable to prevent the occurrence of pinholes. A packaging material including a base film or a thick base film has been used, but the packaging material tends to be hard and cost increases, and it has been difficult to balance usability.

Japanese Patent No. 2538487 JP 2014-233408 A

  The present invention solves the above-mentioned problems, is excellent in production suitability, and has an elution organic substance originally contained in the sealant film, and sterilization and sterilization such as UV irradiation, hot pack, boiling, γ-ray irradiation, and EB irradiation. Deodorize by exerting a high adsorbing effect on odors generated by decomposition of the resin that constitutes the sealant film during processing, and odor adsorption that is difficult to desorb once adsorbed odors is performed efficiently Odor adsorption capacity does not decrease, and it exhibits a high adsorption effect over a long period of time, excellent in odor resistance to liquid contents, and pinhole resistance against rubs during transportation. It is an object of the present invention to provide a packaging material excellent in leakage resistance of liquid contents and a liquid content packaging body for BIB made of the packaging material.

As a result of various studies, the present inventors have at least an outer layer film and an inner layer film, and the outer layer film and the inner layer film are only partially bonded to each other, and each of the outer layer film and the inner layer film has a sealant layer. The sealant layer of the inner layer film includes an odor adsorbing layer, and the odor adsorbing layer is a sealant film containing low-elution polyethylene and a specific hydrophobic zeolite as an odor adsorbing body. I found it.

The present invention is characterized by the following points.
1. An odor adsorption sealant film comprising at least an outer layer film and an inner layer film,
The outer layer film and the inner layer film are only partially bonded to each other,
Each of the outer layer film and the inner layer film includes a sealant layer containing low-elution polyethylene,
The sealant layer of the inner layer film includes an odor adsorbing layer,
The odor adsorbing layer contains a low-elution polyethylene and an odor adsorbent,
The odor adsorbent contains hydrophobic zeolite,
The hydrophobic zeolite, SiO ₂ / Al ₂ O ₃ molar ratio is 30 / 1-8000 / 1,
The odor adsorbing sealant film, wherein the content of the hydrophobic zeolite in the sealant layer is 0.1% by mass or more and 13% by mass or less.
2. Furthermore, the said odor adsorption sealant film of said 1 with which the said sealant layer of the said outer layer film contains the said odor adsorption layer.
3. The odor adsorbent further includes a chemical adsorbent-supporting inorganic porous material,
2. The odor adsorbing sealant film according to 1 above, wherein the content of the chemical adsorbent-supporting inorganic porous material in the sealant layer is 0.1% by mass or more and 10% by mass or less.
4). The density of the said low elution polyethylene is an odor adsorption sealant film in any one of said 1-3 which is 0.90 g / cm < ³ > or more and 0.94 g / cm < ³ > or less.
5. The odor adsorbing sealant film according to any one of the above 1 to 4, wherein the low-eluting polyethylene is LLDPE.
6). The odor adsorbing sealant film according to any one of 1 to 5 above, wherein the low-eluting polyethylene is one or more selected from the group consisting of C4-LLDPE, C6-LLDPE, and C8-LLDPE.
7). The low-eluting polyethylene has 0, 1 or more pinholes generated after 5000 gelboflexes at 23 ° C. in a 50 μm-thick film made only from the low-eluting polyethylene. The odor-adsorbing sealant film according to any one of 1 to 6 above, wherein
8). The low leaching polyethylene has an odor according to any one of 1 to 7 above, wherein the concentration of the leaching TOC contained in a film made from only the low leaching polyethylene is 1.5 ppm or more and 250 ppm or less. Adsorption sealant film.
9. The hydrophobic zeolite is previously melt-kneaded with a thermoplastic resin and a hydrophobic zeolite / thermoplastic resin in a mass ratio of 0.5 / 99.5 to 40/60. The odor adsorption sealant film according to any one of the above.
10. The chemical adsorbent-supporting inorganic porous material is previously melt-kneaded with a thermoplastic resin and a chemical adsorbent-supporting inorganic porous material / thermoplastic resin at a ratio of 0.5 / 99.5 to 40/60, The odor adsorption sealant film according to any one of 2 to 9.
11. The odor adsorption sealant film according to 9 or 10 above, wherein the thermoplastic resin has a melt flow rate of 0.2 to 10.0 g / 10 min.
12 2. The chemical adsorbent constituting the chemical adsorbent-supporting inorganic porous body has a functional group having reactivity with one or more selected from the group consisting of aldehydes, ketones, and carboxylic acids The odor adsorption sealant film according to any one of to 11.
13. The odor adsorption sealant film according to any one of 2 to 12, wherein the chemical adsorbent constituting the chemical adsorbent-supporting inorganic porous body has an amino group.
14 The odor adsorbing layer includes a non-odor adsorbing layer on one side or both sides,
The non-odor adsorbing layer is a layer containing low-elution polyethylene and not containing the odor adsorbing body.
The odor adsorption sealant film according to any one of 1 to 13 above.
15. 15. The odor adsorbing sealant film according to any one of 1 to 14, wherein the outer layer film further includes a base material layer.
16. The odor adsorption packaging material which consists of the odor adsorption sealant film in any one of said 1-15.
17. A liquid content packaging bag for BIB produced from the odor adsorption packaging material described in 16 above.

  The odor-adsorbing sealant film of the present invention has an odor-adsorbing layer having a specific configuration and contains a specific low-elution polyethylene, so that the leaching organic substances and odors originally contained in the packaging material are not present. Reduced and effective adsorption of odor generated by decomposition of the resin that constitutes the sealant film during long-term sterilization / sterilization treatment such as UV irradiation, γ-ray irradiation, EB irradiation, hot pack, boil, etc. Have.

By these effects, when a liquid content package is produced using the odor adsorbing sealant film of the present invention, the amount of organic matter eluted in the filled liquid content is reduced, and the odor change is suppressed. Can do.
Therefore, the odor-adsorbing sealant film of the present invention is suitable as a packaging bag for liquid foods, pharmaceuticals, and medical products that are subjected to sterilization and sterilization.
Furthermore, since the odor adsorbing sealant film of the present invention consists of an outer layer film and an inner layer film that are only partially bonded to each other, pinhole generation due to rubbing during transportation is suppressed, and liquid leakage and the like can be suppressed. .

It is a schematic overhead view which shows an example of the odor adsorption sealant film of this invention. It is an example of the schematic sectional drawing by the sectional line A of the odor adsorption sealant film of FIG. It is sectional drawing which shows an example of a layer structure of an outer layer film or an inner layer film. It is sectional drawing which shows an example of another aspect of the layer structure of an outer layer film or an inner layer film. It is sectional drawing which shows an example of another aspect of the layer structure of an outer layer film or an inner layer film. It is sectional drawing which shows an example of another aspect of the layer structure of an outer layer film or an inner layer film. It is sectional drawing which shows an example of another aspect of the layer structure of an outer layer film. It is a figure which shows the adsorption mechanism with respect to the odorous substance of a chemical adsorbent carrying | support inorganic porous body. It is a schematic overhead view which shows an example of the liquid content packaging bag for BIB. It is an example of the schematic sectional drawing by the sectional line A of the liquid content packaging bag for BIB of FIG.

  The odor adsorbing sealant film, odor adsorbing packaging material, and odor adsorbing packaging body of the present invention will be described in more detail below. This will be described with reference to specific examples, but the present invention is not limited to this.

<Odor adsorption sealant film>
As shown in FIGS. 1 and 2, the odor-adsorbing sealant film of the present invention comprises at least an outer layer film and an inner layer film, and the outer layer film and the inner layer film are only partially bonded to each other.
The partial adhesion part between the outer layer film and the inner layer film is preferably at least at the peripheral edge of the odor adsorbing sealant film, whether it is a lattice shape with continuous lines or a shape with discontinuous lines, It may be a point shape.

The odor-adsorbing sealant film of the present invention, when used as a packaging material, undergoes fatigue breakage due to local repeated bending due to vibration during the packaging process or transportation, or contact with packaging parts such as the contents extraction port. When used as a BIB liquid contents package, pinholes that leak liquid contents may be generated, so pinhole resistance is especially important for packaging materials for food and medical supplies. is there.
When used for aseptic filling, the package is sterilized with an electron beam, gamma rays, ethylene oxide gas, or the like, and then supplied to the next step or the user.

<Layer structure of outer layer film and inner layer film>
Each of the outer layer film and the inner layer film is a film having a sealant layer containing at least low-elution polyethylene.
And the sealant layer of an inner layer film contains an odor adsorption layer. Further, if necessary, the sealant layer of the outer film can also include an odor adsorbing layer.

  The sealant layer having an odor adsorbing layer may be a layer composed only of the odor adsorbing layer as shown in FIG. 3, in order to improve the seal strength and interlayer adhesion strength as shown in FIGS. 4 and 5. Furthermore, it may have a multilayer structure with a non-odor adsorbing layer that contains low-elution polyethylene but does not contain an odor adsorbent.

  As shown in FIG. 6, the odor adsorbing layer may have a multilayer structure in which the kind of low-elution polyethylene as the main component, the kind and content of the odor adsorbing substance are the same or different.

  In the packaging bag using the odor adsorbing sealant film of the present invention, the innermost layer in contact with the liquid content may be an odor adsorbing layer or a non-odor adsorbing layer. When the non-odor adsorbing layer is the innermost layer, the sealing strength of the packaging bag can be improved, and when the odor adsorbing layer is the innermost layer, the interlayer adhesion strength in the packaging bag can be improved.

  Each of the outer layer film and the inner layer film has a base layer, a functional layer such as a reinforcing layer, and an adhesive layer as shown in FIG. 7 in order to improve the strength of the film and to give various functions. In particular, the outer layer film preferably includes a base material layer. A well-known thing can be laminated | stacked and used for a base material layer, a functional layer, and an adhesive bond layer by a well-known method.

<Outer layer film and inner layer film sealant layer>
The sealant layer of the inner layer film includes an odor adsorbing layer, and may further include a non-odor adsorbing layer.
The sealant layer of the outer layer film may include a non-odor adsorption layer and / or an odor adsorption layer.

[Odor adsorption layer]
The odor adsorbing layer in the present invention includes a resin composition containing low-eluting polyethylene and an odor adsorbing body.
Furthermore, it may contain general-purpose polyethylene, polypropylene, methylpentene polymer, acid-modified polyolefin resin, and a mixture of these thermoplastic resins within a range that does not impair the low elution property and heat sealability of the sealant film. Although possible, it is not limited to these resins.

In one embodiment of the present invention, the odor adsorbing layer has a single layer structure formed using a resin composition obtained by kneading an odor adsorbing body and low-elution polyethylene. Here, the odor adsorbent may be uniformly dispersed in the layer, or may be dispersed with a concentration gradient.
For example, you may disperse | distribute with the density | concentration gradient of an increasing tendency toward the outer surface from the inner surface at the time of package formation, and heat seal property improves by this structure. On the contrary, it may be dispersed with a decreasing concentration gradient from the inner surface to the outer surface when the package is formed, and this configuration improves the interlayer adhesion strength.
Furthermore, it may be dispersed with a decreasing concentration gradient from the center in the thickness direction of the odor adsorbing layer toward the both surfaces, and this configuration improves heat sealability and interlayer adhesion strength.

In another embodiment, the odor adsorbing layer may have a multilayer structure in which two or more layers are laminated, wherein each layer is a kind of a low-elution polyethylene as a main component or an odor adsorbing body. You may consist of a resin composition from which a kind and content differ, respectively.
Film formation is possible if the total thickness of the odor adsorbing layer is 5 μm or more, but 10 μm to 200 μm is preferable in order to obtain good film forming properties, heat sealability, interlayer adhesion strength, and odor adsorbing properties.
The odor adsorbent includes a hydrophobic zeolite, and may further include a chemical adsorbent-supporting inorganic porous body.

  Hydrophobic zeolite and chemical adsorbent-supporting inorganic porous material can be directly mixed with low-elution polyethylene and kneaded, or hydrophobic zeolite and chemical adsorbent-supporting inorganic porous material can be thermoplastic resin at high concentration. It is also possible to prepare a master batch by melting and kneading the mixture, and mixing this with a low-elution polyethylene at a ratio corresponding to the target content, followed by melt kneading.

  In the present invention, if the amount of the hydrophobic zeolite added is 0.05% by mass or more in the sealant layer including the odor adsorbing layer, a sufficient odor adsorbing effect can be exhibited. In order to obtain a good odor adsorption effect, it is preferably 0.1% by mass or more, and more preferably 0.25% by mass or more. On the other hand, in order to obtain a good film forming property at the time of producing the laminate, in addition, in order to achieve a good heat sealability, the content of the hydrophobic zeolite is preferably 13% by mass or less, and 10% by mass. The following is more preferable.

  If the content of the chemical adsorbent-supporting inorganic porous material is 0.05% by mass or more in the sealant layer including the odor adsorbing layer, a sufficient adsorbing effect can be exhibited. In order to obtain a good adsorption effect, the content is preferably 0.1% by mass or more, and more preferably 0.25% by mass or more.

  On the other hand, in order to obtain a good film-forming property at the time of producing the laminate, and in addition to achieve a good heat-sealability, the content of the chemical adsorbent-supporting inorganic porous material is contained in the sealant layer including the odor adsorbing layer. In addition, the content is preferably 10% by mass or less, and more preferably 9% by mass or less.

[Low-eluting polyethylene]
In the present invention, the sealant layer of the outer layer film and the inner layer film has a heat-sealability and contains a low-elution polyethylene having a small organic substance elution amount.
By reducing the elution amount of the organic substance, the concentration of the organic substance eluted in the liquid content filled in the package of the present invention can be reduced, and the odor change can be suppressed.
Here, the concentration of the organic substance in the liquid content is indicated by the concentration of total organic carbon (TOC = Total Organic Carbon) in the present invention.
The TOC indicates the concentration of the total amount of organic matter (organic carbon body) that can be oxidized in water as the concentration of carbon, and is used as one of the representative water quality indicators. TOC K0805 ( (Organic carbon (TOC) automatic measuring instrument)).

The concentration of the elution TOC contained in the film made of the low elution polyethylene is 1.5.
It is ppm or more and 250 ppm or less.
Here, the reason for measuring the concentration of the elution TOC related to the low elution polyethylene as a single raw material in a filmed state, not in the state of raw material pellets, is that the low elution polyethylene is used for forming a sealant layer, etc. This is because when the film is formed, various heat histories and the like are given to increase the TOC elution amount.

The increased concentration of TOC in the filled water after 1 kg of distilled water as a filling water was dissolved in a 15 cm × 44 cm × 50 μm thick pouch packaging bag made from the low-elution polyethylene in the present invention. 0.01 ppm or more and 1.5 ppm or less, more preferably 0.02 ppm or more and 1.45 ppm or less, and further preferably 0.025 ppm or more and 1.4 ppm or less.
If the increasing concentration of TOC in the filling water is larger than 1.5 ppm, it is difficult to suppress the change in the odor of the filling water, while the cost becomes high to obtain a smaller one than 0.01 ppm. The effect is limited. From the viewpoint of achieving both cost and performance, the above range is preferable.

  As a specific method for determining the increased concentration of TOC, for example, 1000 g of distilled water at 40 ° C. to 80 ° C. is filled as filling water in the above pouch packaging bag, and 25 ° C. to 50 ° C. for several days to 4 weeks. The TOC concentration of the filled water after storage can be determined by measuring the total organic carbon meter or HS-GC, and subtracting the TOC concentration of the distilled water as a blank.

In the present invention, a packaging body of a pouch bag (15 cm × 44 cm) is prepared using an outer layer film, an inner layer film, and an odor-adsorbing sealant film, and water at 65 ° C. (distilled water for high-performance liquid chromatography, Pure Chemical) 1000 g The standard method is to measure the TOC concentration of the filling water with a TOC-L total organic carbon meter manufactured by Shimadzu Corporation after storage for 2 weeks at 35 ° C. Determine the increasing concentration of TOC.
And the elution TOC density | concentration contained in the sealant film is computed from the TOC increase density | concentration of the obtained filling water, a filling water mass part, and a sealant film mass part.

Specific examples of low-elution polyethylene include low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear (linear) low density polyethylene (LLDPE), and ethylene-vinyl acetate. Low elution of polymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylic acid copolymer, ethylene-propylene copolymer, etc. And mixtures of these resins, but are not limited to these resins.
In order to reduce the elution amount of the organic substance from the low-elution polyethylene film, the following methods are exemplified, but the present invention is not limited thereto.

  When producing polyethylene, it is effective to reduce the amount of unreacted raw material remaining, low molecular weight products and by-products, and to remove the polymerization catalyst. Specifically, improving raw material purity, precisely controlling conditions such as reaction temperature and pressure, removing unreacted raw materials, low molecular weight products, by-products and polymerization catalysts by distillation or washing, Examples include a method of preventing oxidation due to contact with oxygen in the air at a high temperature.

When pelletizing the manufactured polyethylene, there is a method of restricting the use of lubricants, antioxidants, and other additives that are likely to increase the elution amount of organic matter.
When filming polyethylene, there is a method to limit the use of lubricants, antioxidants, solvents, and other additives that may increase the elution amount of organic substances, and to prevent oxidation at high temperatures. Can be mentioned.

  In the present invention, the sealant layer has heat sealability and contains low elution polyethylene, so that the packaging material produced from the odor adsorbing sealant film has excellent heat sealability and the amount of organic matter eluted. Therefore, the increase in the TOC concentration of the liquid content in the package can be reduced.

Polyethylene is preferable in that it has a property of being resistant to sterilization and sterilization treatment such as UV rays and hardly decomposed.
Among these low-elution polyethylenes, LLDPE is preferred as the type, and furthermore, LLDPE having side chains of C4, C6, and C8 tends to reduce the elution amount of organic matter, so C4-LLDPE C6-LLDPE, C8-LLDPE and the like are more preferable.

Here, C4, C6, and C8 are partially copolymerized with LLDPE to indicate that a monomer having the described numerical value of carbon number is present in the side chain. For example, C4 represents butene-1, C6 represents hexene-1, or 4 methylpentene-1, and C8 represents a side chain of the structure of octene-1.
Alternatively, a low-elution polyethylene having a density of 0.90 g / cm ³ or more and 0.94 g / cm ³ or less is preferable, and a low-elution polyethylene having a density of 0.905 g / cm ³ or more and 0.933 g / cm ³ or less. More preferred. Low-elution polyethylene having a density in this range tends to reduce the elution amount of organic matter.
The low-elution polyethylene can also contain a small amount of additives such as antioxidants and antiblocking agents.
Furthermore, it is preferable that the low-elution polyethylene in the present invention is excellent in resistance to pinholes due to bending when formed into a single film.

The pinhole resistance of the low-elution polyethylene in the present invention is, for example, that the number of pinholes generated after 5,000 gelboflexes at 23 ° C. in a 50 μm-thick film made of low-elution polyethylene alone is 0, Or it is preferable that they are 1 or more and 160 or less.
When the number of pinholes generated in the sealant film is within the above range, a packaging material that can withstand practical use can be produced for applications that require pinhole resistance.

[Odor adsorbent]
In the present invention, the odor adsorbent contains a specific hydrophobic zeolite, and can further contain a chemical adsorbent-supporting inorganic porous material.

(Hydrophobic zeolite)
Generally, the higher the molar ratio of SiO ₂ / Al ₂ O ₃ is, the higher the hydrophobicity of the zeolite, and the hydrophobic zeolite contained in the odor adsorbing layer in the present invention is the molar ratio of SiO ₂ / Al ₂ O ₃ . The ratio is preferably 30/1 to 8000/1.
Hydrophobic zeolite does not lose its odor adsorbing ability even when the package or the packaging material is exposed to 230 ° C. or higher, and can exert a deodorizing effect due to adsorption of odor components.
Hydrophobic zeolite may have any outer shape such as a spherical shape, a rod shape, an elliptic shape, etc., and may have any shape such as a powder shape, a lump shape, and a granular shape. From the viewpoint of uniform dispersion and kneading characteristics, powder form is preferable.

  In the present invention, the average particle size of the hydrophobic zeolite can be appropriately selected from those having an average particle size depending on the application, but those having an average particle size of 0.01 μm to 10 μm are preferable. Here, the average particle diameter is a value measured by a dynamic light scattering method.

  When the average particle size is smaller than 0.01 μm, aggregation of the hydrophobic zeolite tends to occur, and the dispersibility in the low-elution polyethylene tends to decrease. In addition, when the average particle size is larger than 10 μm, the film forming property of the odor adsorbing layer tends to be inferior, so that it is difficult to add a large amount of hydrophobic zeolite and the surface area is further reduced. There is a possibility that the odor effect cannot be obtained.

  Hydrophobic zeolite is hydrophobic, so it is difficult to adsorb highly polar water molecules etc. Conversely, it has low affinity for odor molecules, hydrophobic gas, lipophilic gas (including solvent-based gas). These are high and are easy to adsorb these. Furthermore, due to the effects of alkali metals such as Ca, Na, K, and alkaline earth metals present on the zeolite surface, the zeolite surface exhibits basicity, and acid gases are easily adsorbed by a neutralization reaction.

(Chemical adsorbent-supporting inorganic porous material)
In the present invention, the chemical adsorbent-supporting inorganic porous material is a material in which a chemical adsorbent is supported on an inorganic porous material, such as an elution organic substance, UV irradiation, γ-ray irradiation, EB irradiation, hot pack, boil It has a function of adsorbing odorous substances generated from the package during sterilization and sterilization treatment.

  As the loading method, a known or conventional loading method can be applied. For example, the inorganic porous body is impregnated with a solution containing a chemical adsorbent described below and dried. it can.

  In the present invention, by containing the odor adsorbent in which the chemical adsorbent is supported on the inorganic porous body in the odor adsorbing layer, the adsorbing capacity per unit mass of the chemical adsorbent can be greatly increased, The content of the chemical adsorbent-supporting inorganic porous material can be reduced. In addition, physical adsorption characteristics for the pores of the inorganic porous material can be expected.

By reducing the content, high sealing strength can be obtained, and excellent heat sealability and film forming properties required as a sealant film can be maintained.
In addition, the chemical adsorbent-supporting inorganic porous material may have an arbitrary outer shape such as a spherical shape, a rod shape, an elliptical shape, and may have any shape such as a powder shape, a lump shape, and a granular shape. From the viewpoint of film properties, uniform dispersion in a thermoplastic resin, kneading characteristics, and the like, a powder form is preferable.

As the chemical adsorbent-supporting inorganic porous material, those having an arbitrary average particle size can be appropriately selected according to the use, but in the present invention, those having an average particle size of 0.01 μm to 10 μm are particularly preferable. More preferably, the thickness is 1 μm to 8 μm, and more preferably 1 μm to 7 μm. Here, the average particle diameter is a value measured by a dynamic light scattering method.
When the average particle size is smaller than 0.01 μm, the chemical adsorbent-carrying inorganic porous body tends to aggregate, and the dispersibility of the chemical adsorbent-carrying inorganic porous body in the low-elution polyethylene tends to be lowered.
In addition, when the average particle size is larger than 10 μm, the film formation of the odor adsorbing layer is inferior, so that it is difficult to contain a large amount of the chemical adsorbent-supporting inorganic porous material, and a sufficient adsorption effect may not be obtained. Sex occurs.

(Inorganic porous material)
In the present invention, as the inorganic porous material, any inorganic compound having a large number of pores on its surface can be used. For example, inorganic phosphoric acid such as zeolite, silicon dioxide, silicate, activated carbon, titania, calcium phosphate, etc. Examples include salts, alumina, aluminum hydroxide, magnesium hydroxide, and mixtures thereof.

In particular, it is preferable to apply aluminum hydroxide, zeolite, or silicate from the viewpoint of having a porous state having an effective pore size with respect to the molecular size or cluster size of the substance to be adsorbed and from the viewpoint of safety.
In addition, these may be any external shape such as a spherical shape, a rod shape, an elliptical shape, and may be any shape such as a powder shape, a lump shape, and a granular shape. After that, the powder form is preferable from the viewpoint of the film forming property of the odor adsorbing layer, the uniform dispersion in the thermoplastic resin, the kneading characteristics, and the like.

  The inorganic porous material can be appropriately selected from those having any average particle size depending on the application, but in the present invention, in particular, in order to obtain the chemical adsorbent-carrying inorganic porous material having the above average particle size, Those having an average particle diameter of 0.01 μm to 10 μm are preferable, those having an average particle diameter of 0.1 μm to 8 μm are more preferable, and those having an average particle diameter of 1 μm to 7 μm are still more preferable.

(Chemical adsorbent)
In the present invention, the chemical adsorbent has a reactive functional group that causes a chemical reaction with and binds to an eluting organic substance or an odorous substance generated by decomposition of a resin during sterilization / sterilization treatment, and It is a compound that can be supported on an inorganic porous material.
More specifically, reactive functional groups that bind to various aldehydes, ketones, carboxylic acids and the like generated during UV irradiation, γ-ray irradiation, EB irradiation, sterilization / sterilization treatment of hot packs, boil, etc. It is a compound that has.

  Examples of such compounds include compounds having basic functional groups such as amino groups and hydroxyl groups, metal carbonates, metal hydrogen carbonates, amide group-containing compounds, and the like. However, it is not limited to these.

Examples of the compound containing an amino group include alkylamine, ethylenediamine, tetramethylenediamine, diethylenetriamine, triethylenetriamine, tetraethylenepentamine, piperazine, metaphenylenediamine, and polyamine.
Examples of the compound having a hydroxyl group include metal hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, and iron hydroxide.
Examples of the metal carbonate include sodium carbonate and calcium carbonate.
Examples of the hydrogen carbonate include sodium hydrogen carbonate.
Examples of the amide group-containing compound include 2-acrylamido-2-methylpropanesulfonic acid.

In the present invention, a compound having an amino group is preferable as the chemical adsorbent exhibiting a particularly excellent adsorption effect.
Although the adsorption mechanism with respect to adsorption | suction object substances, such as an eluting organic substance and an odor substance, of a chemical adsorbent is demonstrated in more detail using the specific example of Fig.8 (a)-(b), this invention is not limited to these.

For example, when the adsorption target substance (odor substance) is an acid odor substance, as shown in FIG. 8 (a), as the chemical adsorbent, for example, a compound having a hydroxyl group is selected on the inorganic porous body. It can be used as a chemically adsorbent-supported inorganic porous material. Thereby, a carboxyl group and a hydroxyl group cause a chemical reaction and combine to adsorb the substance to be adsorbed.
When the adsorption target substance is an aldehyde, as shown in FIG. 8 (b), for example, a compound having an amino group is selected as the chemical adsorbent and is supported on the inorganic porous body and is adsorbed on the chemical adsorbent. It can be used as a supported inorganic porous material. Thereby, an aldehyde group and an amino group cause a chemical reaction and combine to adsorb the substance to be adsorbed.

At this time, by the chemical adsorption, the adsorption target substance (odor substance) once adsorbed is not desorbed, and the odor adsorption can be performed efficiently.
Furthermore, unlike the physical adsorbent in which the adsorption target substance (odor substance) and water vapor are adsorbed at the same adsorption site, the chemical adsorbent in the present invention binds the adsorption target substance to a specific functional group of the chemical adsorbent. Therefore, it is difficult to be affected by various substances that reduce the odor adsorption ability, such as water vapor.

<Non-odor adsorption layer>
The non-odor adsorbing layer in the present invention is a layer containing low-elution polyethylene and not containing an odor adsorbing body.
Furthermore, high-elution polyethylene, polypropylene, methylpentene polymer, acid-modified polyolefin resins, and mixtures of these thermoplastic resins are included within a range that does not impair the low-elution property and heat sealability of the sealant film. It is possible, but not limited to these resins.

<Method for producing outer layer film or inner layer film>
(Odor adsorbent dispersion method)
As a method for kneading the odor adsorbent and the low-elution polyethylene, a known or conventional kneading method can be applied.
It is also possible to mix the odor adsorbent directly with low-elution polyethylene and knead, or mix the odor adsorbent with a thermoplastic resin at a high concentration and then melt-knead to prepare a master batch. It is also possible to use a so-called masterbatch method in which the low-elution polyethylene is mixed, melted and kneaded at a ratio corresponding to the target content.

The content of the hydrophobic zeolite in the master batch is preferably 0.5% by mass or more and 40% by mass or less, and more preferably 1% by mass or more and 20% by mass or less.
The content of the chemical adsorbent-supporting inorganic porous material in the master batch is preferably 0.5% by mass or more and 40% by mass or less, and more preferably 1% by mass or more and 20% by mass or less.

In the case of the master batch method, even if the combination of an odor adsorbent and low-elution polyethylene that are likely to agglomerate, the odor adsorbent can be uniformly dispersed in the low-elution polyethylene.
At this time, the thermoplastic resin in the master batch may or may not be the same as the low-elution polyethylene in the odor adsorbing layer. Depending on the purpose, it is possible to combine the same low-elution polyethylene and other types of thermoplastic resins.

  For example, if the odor adsorbent and low-elution polyethylene are melt-mixed in advance, they are homogeneous and have good film-forming properties, heat-sealability, and interlayer adhesion strength when mixed or melt-kneaded with low-elution polyethylene again. And odor adsorption.

  Examples of thermoplastic resins other than the low-elution polyethylene in the odor adsorbing layer include general-purpose non-elution polyethylene, polypropylene, methylpentene polymer, polyolefin resins such as acid-modified polyolefin resins, and mixtures of these resins. However, it is not limited to these resins.

  The thermoplastic resin preferably has a low elution property comparable to that of the low elution polyethylene in the present invention, but a general-purpose resin is used within a range that does not greatly affect the elution amount of organic matter from the entire sealant layer. Can be used.

(Film forming / laminating method)
In the present invention, the method for forming and laminating each layer of the outer layer film or the inner layer film is not particularly limited, and a known or conventional film forming method or laminating method can be applied.
Laminating an odor adsorbing layer or a non-odor adsorbing layer by extrusion coating on another layer, optionally via an adhesive layer, for example, a plurality of odor adsorbing layers and non-odor adsorbing layers, It can also be formed by coextrusion by an inflation method or a casting method.

  When laminating by extrusion coating, first, the resin composition forming the odor adsorbing layer and the resin composition forming the non-odor adsorbing layer are heated and melted, and then expanded and expanded in the width direction required by the T-die. Extruded into a curtain shape, the molten resin is allowed to flow down on the surface to be laminated, and sandwiched between a rubber roll and a cooled metal roll, thereby forming an odor adsorbing layer and a non-odor adsorbing layer and bonding to the layer to be laminated And laminating at the same time.

The melt flow rate (MFR) of the low-elution polyethylene contained in the odor adsorbing layer and the thermoplastic resin contained in the non-odor adsorbing layer when laminated by extrusion coating is 0.2 to 50 g / 10 min. Is more preferable, and 0.5 to 30 g / 10 min is more preferable. In addition, in this specification, MFR is a value measured from the method based on JISK7210.
When the MFR is less than 0.2 g / min, or 50 g / min or more, it is difficult to be effective in terms of proper processing.
When the inflation method is used, the melt flow rate (MFR) of the low-elution polyethylene contained in the odor adsorbing layer or the thermoplastic resin contained in the non-odor adsorbing layer is 0.2 to 10.0 g / 10 min. It is preferably 0.2 to 9.5 g / 10 min.
When the MFR is less than 0.2 g / 10 minutes, or 10.0 g / 10 minutes or more, the processing suitability tends to be inferior.

  Alternatively, an odor adsorbing layer and a non-odor adsorbing layer formed in advance may be laminated via an adhesive layer by dry lamination, non-solvent lamination, sand lamination, or the like.

<Adhesive layer>
In the present invention, an adhesive layer may be provided and laminated between each layer in the sealant layer, and between each layer such as the sealant layer-base material layer.
The adhesive layer may consist of an adhesive or any anchor coating agent.
The adhesive may be a thermosetting type, an ultraviolet curable type, an electron beam curable type, or the like, and may be in any form such as an aqueous type, a solution type, an emulsion type, and a dispersion type. The bonding mechanism may be any form such as a chemical reaction type, a solvent volatilization type, a heat melting type, and a hot pressure type.

  The adhesive layer may be a layer formed of an EC (extrusion coat) layer, an adhesive for dry lamination, an adhesive for non-solvent lamination, or the like.

Examples of components that form such an adhesive layer include polyvinyl acetate adhesives such as polyvinyl acetate and vinyl acetate-ethylene copolymers, and copolymers of polyacrylic acid and polystyrene, polyester, polyvinyl acetate, and the like. A polyacrylic acid adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive composed of a copolymer of ethylene and a monomer such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, a cellulose adhesive, Polyurethane adhesive, polyester adhesive, polyamide adhesive, polyimide adhesive, polyolefin adhesive such as LDPE, amino resin adhesive made of urea resin or melamine resin, phenol resin adhesive, epoxy Adhesive, reactive (meth) acrylic adhesive, chloroprene rubber, nitrile rubber, Styrene - butadiene made of rubber or the like elastomeric adhesive, a silicone adhesive, an alkali metal silicate, inorganic adhesive or the like made of a low-melting glass.

Examples of the anchor coating agent that can be used include organic titanium-based, isocyanate-based, polyethyleneimine-based, acid-modified polyethylene-based, and polybutadiene-based anchor coating agents.
When the adhesive layer is laminated by extrusion coating, it is not particularly limited, but the adhesive can be formed by extrusion coating on the adhesion target layer.

  In extrusion coating, the adhesive is first heated and melted, expanded and stretched in the necessary width direction with a T-die and extruded into a curtain shape, and the melt is allowed to flow down onto the layer to be bonded, cooling with a rubber roll. By sandwiching between the metal rolls, the formation of the adhesive layer, the adhesion to the adhesion target layer, and the lamination are performed simultaneously.

When using an adhesive for dry laminating as an adhesive layer, an adhesive dispersed or dissolved in a solvent is applied on one layer and dried, and the other adhesion target layer is laminated and laminated, and then 30 to 120 ° C. The adhesive is cured and laminated by aging for several hours to several days.
When using a non-solvent laminating adhesive, the adhesive itself is applied onto the layer without being dispersed or dissolved in a solvent and dried, and the other layer to be bonded is stacked and laminated at 30 to 120 ° C. The adhesive is cured and laminated by aging for several hours to several days.

The adhesive layer is formed by applying the above-mentioned adhesive by, for example, roll coating, gravure roll coating, kiss coating or the like, and the coating amount is preferably about 0.1 to 10 g / m ² (dry state). By setting the coating amount of the adhesive within the above range, good adhesiveness can be obtained.

  In the case of laminating by sand lamination, any resin that can be heated and melted and applied by an extruder can be used for the adhesive layer. Specifically, the thermoplastic resin used for the non-odor adsorbing layer can be preferably used.

<Packaging materials>
The odor adsorbing sealant film of the present invention can be produced as it is or by laminating a base material layer and a functional layer as necessary. In particular, it is also suitable as a packaging material for BIB liquid contents.

<Packaging body, BIB liquid content packaging bag>
The package of the present invention is used, for example, as a BIB liquid contents packaging bag, and is used for filling contents in a state where the contents extraction port is sealed with a cap. That is, when used for normal applications, the sealed BIB liquid contents package is supplied to the user in a cardboard box, but when used for aseptic filling, the sealed BIB liquid contents package is used. The body is sterilized with an electron beam, gamma rays, ethylene oxide gas or the like and then supplied to the user.

As shown in FIG. 9, for example, the BIB liquid contents packaging bag of the present invention includes at least a double bag portion using a packaging material produced from the odor adsorbing sealant film of the present invention and a resin molded product. It consists of an object extraction port.
As shown in FIGS. 9 and 10, the double bag portion is composed of an upper film and a lower film, and the content extraction port is attached to the upper film.

<Liquid contents>
In the present invention, the liquid content refers to all liquids such as seasoning liquids such as drinking water, juices, drip infusions, soy sauce, sauces, soy sauce, honey, sauce and dressings.
[Production method of package]
For example, as shown in FIG. 10, the package of the present invention is formed by folding the packaging material so that the sealant layer of the upper film to which the content extraction port is attached and the sealant layer of the lower film face each other. Overlapping sheets, for example, side seal type, two-side seal type, three-side seal type, four-side seal type, envelope-attached seal type, joint-attached seal type (pillow seal type), pleated seal type, flat bottom It can be manufactured by heat-sealing in a heat-sealing form such as a sealing type, a square bottom sealing type, a gusset type.
As a heat sealing method, known methods such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be applied.

  As a method of attaching the content extraction port to the upper film, a hole is made at the attachment position of the content extraction port of the upper film, the content extraction port is inserted into the hole from the inside of the upper film, and The inner surface of the upper film is heat-sealed and fixed to the outside of the flange, and a cap is put on the content extraction port to make it sealed.

<Content extraction port>
The content extraction port is an inlet / outlet for filling and / or taking out the content. The content extraction port may be filled and taken out with one content extraction port. The filling and unloading of the contents may be performed at separate contents extraction ports.

Although there is no restriction | limiting in particular in the attachment position of a content extraction port, It is preferable to attach to the four side vicinity of a package.
The content extraction port contains a polyolefin resin.

  Specific examples of polyolefin resins include polyethylene resins (LDPE, MDPE, HDPE, LLDPE, etc.), various ethylene copolymers, polypropylene resins, cyclic polyolefin resins, methylpentene polymers, acid-modified polyolefin resins, and the like. However, it is not limited to these.

  The melt flow rate of the polyolefin resin is preferably 5 g / min or more and 100 g / min or less from the viewpoint of moldability.

In addition, the content extraction port has processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, releasability, flame retardancy, antifungal properties, electrical properties, strength, etc. Various plastic compounding agents, additives and the like can be contained for the purpose of improving and modifying the above.
Furthermore, the content extraction port can also contain a low-elution polyethylene or an odor adsorbent as required.
The content extraction port can be obtained by mixing and kneading the above various raw materials by a known method to prepare a resin composition, and molding the resin composition by a known method.

Details of the raw materials used in the examples are as follows.
[Low-eluting polyethylene and general-purpose polyethylene for inner and outer film]
The polyethylene listed in Table 1 and the following polyethylene were used.
UMERIT0520F: LLDPE manufactured by Ube Industries, Ltd.
Novatec LC520: manufactured by Nippon Polyethylene Co., Ltd., LDPE resin.

[Resin and molding for content extraction port]
-The content extraction ports A-E were obtained by 200 degreeC injection molding using the low elution polyethylene for resin molded products described in the table | surface.

[Odor adsorbent]
(Chemical adsorbent-supporting inorganic porous material)
-Kesmon NS-241: Toagosei Co., Ltd., an amino group-containing compound-carrying inorganic porous material. Average particle size 3.5 μm.
(Hydrophobic zeolite)
・ Mizuka Sieves EX-122: Made by Mizusawa Chemical Co., Ltd. SiO ₂ / AL ₂ O ₃ molar ratio = 32/1, average particle size 2.5 to 5.5 μm.
-Shilton MT400: manufactured by Mizusawa Chemical Industry Co., Ltd. SiO ₂ / AL ₂ O ₃ molar ratio = 400/1, average particle diameter 5 to 7 μm.
-Shilton MT2000: manufactured by Mizusawa Chemical Co., Ltd. SiO ₂ / AL ₂ O ₃ molar ratio = 2000/1, average particle diameter of 2 to 4 μm.
-Shilton MT-8000: manufactured by Mizusawa Chemical Co., Ltd. SiO ₂ / AL ₂ O ₃ molar ratio = 8000/1, average particle diameter 0.8 μm.
(Hydrophilic zeolite)
・ Mizuka Sieves Y-420: manufactured by Mizusawa Chemical Co., Ltd. SiO ₂ / AL ₂ O ₃ molar ratio = 5/1, average particle diameter 5 μm.

[Base film]
Bonil RX: biaxially stretched nylon film manufactured by Kojin Film & Chemicals Co., Ltd. 15 μm thick.
IB-ONY: a gas barrier biaxially stretched nylon film manufactured by Dai Nippon Printing Co., Ltd. 15 μm thick.

[Others]
-EMB-21: Sumitomo Chemical Co., Ltd. antiblocking agent.
-PEX ABT-16: Nippon Polyethylene Corporation, an anti-blocking agent.
EMB-10: Sumitomo Chemical Co., Ltd., slip agent.

[Master batch adjustment]
MB (master batch) of the outer layer film and inner layer film was prepared by adjusting as follows.
(Adjustment of MB1)
Ultrazex 1520L, which is LLDPE of low-elution polyethylene, and Mizuka Sieves EX-122, which is a hydrophobic zeolite, were melt blended at the following ratio to obtain Master Batch 1 (MB1).
ULTZEX 1520L 90 parts by mass Mizuka Sieves EX-122 10 parts by mass (adjustment of MB2-13)
The raw materials were melt blended in the same manner as MB1 according to the formulations shown in Tables 3 and 4, and master batches 2 to 13 (MB2 to 13) were obtained.

[Production of outer layer film]
Outer layer films A to I described in Table 4 were produced.
(Preparation of outer layer film A)
Ultrathex 1520L was formed by inflation at 160 ° C. to prepare an 80 μm sealant film, which was designated as outer layer film A. The layer configuration and evaluation results are shown in Table 4.
(Preparation of outer layer film B)
First, Ultrazex 1520L was laminated at 160 ° C. by inflation film formation to produce a 40 μm sealant film, which was designated as outer layer film A. The layer configuration and evaluation results are shown in Table 4.
Next, the outer layer film B was obtained by laminating the biaxially stretched nylon film Bonil RX and the sealant film obtained above using Novatec LC520 as an adhesive layer by an extrusion coating method at 320 ° C. The layer configuration and evaluation results are shown in Table 4.

(Preparation of outer layer film C)
First, the Ultzex 1520L, a mixture of UMERIT0520F / MB2 = mass ratio 50/50, and an Ultzex 1520L / EMB-21 = mass ratio 97/3 mixture were laminated at 160 ° C. by inflation film formation, and the sealant. A film was prepared.
Next, using Novatec LC520 as an adhesive layer by an extrusion coating method at 320 ° C., the biaxially stretched nylon film Bonil RX and the above-obtained sealant film, the Ultzex 1520L surface, are laminated to form an outer layer film. A was obtained.
The layer configuration and evaluation results are shown in Table 4.

(Preparation of outer layer films D, F, H)
The outer layer films D, F, and H were obtained in the same manner as the outer layer film C with the configuration shown in Table 4. The layer configuration and evaluation results are shown in Table 4.
(Production of outer layer films E, G, I)
The outer layer films E, G, and I were obtained in the same manner as the outer layer film A with the configuration shown in Table 4. The layer configuration and evaluation results are shown in Table 4.

<Example 1>
[Production of inner layer film]
First, the following mixture 1 was prepared for the odor adsorption layer, and mixture 2 was prepared for the non-odor adsorption layer.

Mixture 1:
UMERIT0520F 50 parts by mass MB2 50 parts by mass Mixture 2:
Woltzex 1520L 97 parts by weight EMB-21 3 parts by weight And then, Woltzex 1520L, the mixture 1 and the mixture 2 are laminated at 160 ° C. by inflation film formation to produce a three-layer inner film A did. Details are shown in Table 5.

[Production and evaluation of packaging]
Using the outer layer film A, the inner layer film A and the content extraction port A obtained above, the package shown in FIG. 1 (the size of the double bag portion is 450 mm × 450 mm, and the diameter of the content extraction port A is 31 m.
m) was prepared, and heat sealability, bag-breaking characteristics, pinhole resistance (inner layer film), and increased concentration of filling water TOC were evaluated.
Table 5 shows the detailed configuration and evaluation results of the laminate.

<Examples 2 to 19 and Comparative Examples 1 to 5>
According to the composition described in Tables 5 to 8, a mixture for an odor adsorbing layer and / or a non-odor adsorbing layer was obtained in the same manner as in Example 1 to prepare an inner layer film.
And according to the description of Tables 5-8, the outer layer film and the content extraction port were combined, the package was produced, and it evaluated similarly. The detailed structure and evaluation result of a package are shown in Tables 5-8.

<Evaluation>
[Film forming properties]
The appearance of was observed and sensorially evaluated. The evaluation criteria are as follows.
○: Film can be formed without wrinkles or bumps on the film.
X: Many wrinkles and bumps occur in the film, making film formation difficult.

[Breaking resistance]
The operation of filling 10 L of water into the packages prepared in Examples and Comparative Examples, and dropping the package after water filling from a height of 1 m was repeated three times in total, and the presence or absence of broken bags was evaluated.
Pass / fail judgment A: No bag breakage after 3 drop evaluations. Pass ○: One bag is broken after three drop evaluations. Pass ×: All bags are broken by three drop evaluations. failure

[Pinhole resistance of the inner layer film alone]
The produced inner layer film was cut into an A4 size (30 cm × 21 cm), and after bending with a gelboflex tester (manufactured by Tester Sangyo Co., Ltd., BE-1005), it occurred in a 30 cm × 21 cm plane of each sample. The number of pinholes was counted. 160 or less were accepted.
Temperature: 23 ° C
Gelbo flexion: 5000 times

[Pin-hole resistance of package]
The produced package was transported by an actual transportation route in a state of being packaged for transportation as a liquid content package for BIB, and the number of pinholes generated in the inner layer film of the bag portion was counted. 160 or less were accepted.

[Filled water TOC increase concentration]
Before producing a package in Examples and Comparative Examples, UV irradiation sterilization treatment was performed on the inner surface film side of the packaging material constituting the package in advance.
The packaging obtained in the examples and comparative examples was hot-packed with 1000 g of water at 65 ° C. (distilled water for high-performance liquid chromatography, Junsei Kagaku) to produce a packaging liquid filling at 35 ° C. for 2 weeks. After storage, the TOC concentration of the filling water was measured with a TOC-L total organic carbon meter manufactured by Shimadzu Corporation.

Next, the TOC concentration was similarly measured for water before filling.
The TOC increase concentration in each package was determined from the following formula.
TOC increase concentration = filled water TOC concentration after storage-TOC concentration of water before filling TOC concentration of water before filling: 0.02 ppm
UV irradiation sterilization conditions UV wavelength: 253.7 nm
Irradiation time: 10 seconds
Temperature: 25 ° C

<Summary of results>
The packaging bodies of all the examples exhibited good film-forming properties, resistance to bag breaking, heat sealability, and pinhole resistance, and the TOC increase concentration was small.
Comparative example 1 in which the outer layer film does not contain an odor adsorbent, the inner layer film contains neither low-elution polyethylene nor odor adsorbent, and the inner layer film contains no low-elution polyethylene, and hydrophilic zeolite is used instead of hydrophobic zeolite. Including Comparative Example 2 tended to have a high TOC increase concentration. Further, in Comparative Examples 3, 4, and 5 in which the outer layer film or the inner layer film contains too much hydrophobic zeolite, the reduction in the TOC concentration is large, but the film forming property of the outer layer film or the inner layer film is inferior, and heat sealability and breakage resistance are reduced. The results showed poor bag characteristics.

1. Odor adsorption sealant film2. 2. Adhesion between outer layer film and inner layer film 3. outer layer film Inner layer film5. Sealant layer6. Odor adsorption layer 6a. Odor adsorbing layer 6b. 6. Odor adsorption layer Non-odor adsorbing layer8. Base material layer 9. Adhesive layer 11. Packaging, liquid content packaging for BIB
12 Double bag
13. Contents extraction port
14 Double bag heat seal
15. Upper film
16. Lower film 20. Chemical adsorbent-supporting inorganic porous material
A, B. Section line

Claims (17)

An odor adsorption sealant film comprising at least an outer layer film and an inner layer film,
The outer layer film and the inner layer film are only partially bonded to each other,
Each of the outer layer film and the inner layer film includes a sealant layer containing low-elution polyethylene,
The sealant layer of the inner layer film includes an odor adsorbing layer,
The odor adsorbing layer contains a low-elution polyethylene and an odor adsorbent,
The odor adsorbent contains hydrophobic zeolite,
The hydrophobic zeolite has a SiO ₂ / Al ₂ O ₃ molar ratio of 30/1 to 8000/1,
The odor adsorbing sealant film, wherein the content of the hydrophobic zeolite in the sealant layer is 0.1% by mass or more and 13% by mass or less.   Furthermore, the said odor adsorption sealant film of Claim 1 in which the said sealant layer of the said outer layer film contains the said odor adsorption layer. The odor adsorbent further includes a chemical adsorbent-supporting inorganic porous material,
2. The odor adsorbing sealant film according to claim 1, wherein the content of the chemical adsorbent-supporting inorganic porous material in the sealant layer is 0.1% by mass or more and 10% by mass or less. The odor adsorption sealant film according to any one of claims 1 to 3, wherein the density of the low-elution polyethylene is 0.90 g / cm ³ or more and 0.94 g / cm ³ or less.   The odor adsorption sealant film according to any one of claims 1 to 4, wherein the low-elution polyethylene is LLDPE.   The odor-adsorbing sealant film according to any one of claims 1 to 5, wherein the low-elution polyethylene is one or more selected from the group consisting of C4-LLDPE, C6-LLDPE, and C8-LLDPE. .   The low-eluting polyethylene has 0, 1 or more pinholes generated after 5000 gelboflexes at 23 ° C. in a 50 μm-thick film made only from the low-eluting polyethylene. The odor adsorption sealant film according to any one of claims 1 to 6, wherein the odor adsorption sealant film is one or less.   8. The low-elution polyethylene according to claim 1, wherein the concentration of the elution TOC contained in a film made from only the low-elution polyethylene is 1.5 ppm or more and 250 ppm or less. Odor adsorption sealant film.   The hydrophobic zeolite is melt-kneaded in advance at a mass ratio of thermoplastic resin and hydrophobic zeolite / thermoplastic resin of 0.5 / 99.5 to 40/60. The odor adsorbing sealant film according to any one of the above.   The chemical adsorbent-supporting inorganic porous material is melt-kneaded in advance at a ratio of 0.5 / 99.5 to 40/60, a thermoplastic resin and a chemical adsorbent-supporting inorganic porous material / thermoplastic resin. Item 10. The odor adsorption sealant film according to any one of Items 2 to 9.   The odor adsorption sealant film according to claim 9 or 10, wherein a melt flow rate of the thermoplastic resin is 0.2 to 10.0 g / 10 min.   The chemical adsorbent constituting the chemical adsorbent-supporting inorganic porous material has a functional group reactive with one or more selected from the group consisting of aldehydes, ketones, and carboxylic acids. The odor adsorption sealant film according to any one of 2 to 11.   The odor adsorption sealant film according to any one of claims 2 to 12, wherein the chemical adsorbent constituting the chemical adsorbent-supporting inorganic porous body has an amino group. The odor adsorbing layer includes a non-odor adsorbing layer on one side or both sides,
The non-odor adsorbing layer is a layer containing low-elution polyethylene and not containing the odor adsorbing body.
The odor adsorption sealant film according to any one of claims 1 to 13.   The odor adsorption sealant film according to any one of claims 1 to 14, wherein the outer layer film further includes a base material layer.   The odor adsorption packaging material which consists of an odor adsorption sealant film of any one of Claims 1-15.   A liquid content packaging bag for BIB made from the odor adsorbing packaging material according to claim 16.

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