JP2015091720A - Hygroscopic and easily peelable package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hygroscopic and easily peelable package where; the filling of a moisture absorbent is not necessary; workability is superior; a high moisture absorption effect is exhibited; and further, easily peelable characteristics is exhibited.SOLUTION: A hygroscopic and easily peelable package is obtained by that: a hygroscopic laminate film having at least a gas barrier layer and a hygroscopic heat seal layer and an easily peelable laminate film having at least a gas barrier layer and an easily peelable heat seal layer are superimposed so as to face the surface of the hygroscopic heat seal layer and the surface of the easily peelable heat seal layer to each other; and peripheral edge parts are heat-sealed.

Description

  The present invention relates to a package that absorbs moisture in the package and has easy peelability.

  In a package that wraps a product that dislikes moisture such as a biosensor such as a blood glucose level measurement sensor (glucose sensor, enzyme electrode), a hygroscopic agent such as silica gel is filled together with the product in order to remove moisture inside. Is known (Patent Documents 1 and 2).

  However, filling such a hygroscopic agent has a problem in that the surface of the package is uneven, making it easier to break the bag. Further, there is a problem that even if the bag is not broken, the gas barrier layer provided in the laminated film constituting the package is damaged in order to prevent water vapor from entering. In addition, the filling of the hygroscopic agent causes unevenness, the package becomes bulky, the filling property at the time of packaging is lowered, and the transportation cost is increased.

Further, there is a problem that the moisture absorbent is crushed in the bag during transportation or storage, and the fragments and powder adhere to contents such as a blood glucose level measurement sensor and have an adverse effect.
Furthermore, there are problems that the number of steps for filling the hygroscopic agent is increased, the working efficiency is lowered, and the manufacturing cost is increased.

Japanese Patent No. 4138070 Japanese Patent No. 4422285

  The present invention provides a hygroscopic peelable package that solves the above problems, does not need to be filled with a hygroscopic agent, has good workability and exhibits a high hygroscopic effect, and further exhibits easy peelability. For the purpose.

  As a result of various studies, the inventors have obtained a hygroscopic laminated film having at least a gas barrier layer and a hygroscopic heat seal layer, and an easily peelable laminated film having at least a gas barrier layer and an easily peelable heat seal layer. The hygroscopic easily peelable packaging body obtained by superposing the surface of the hygroscopic heat seal layer and the surface of the easily peelable heat seal layer so as to face each other and heat-sealing the peripheral portion achieves the above object. I found out.

The present invention is characterized by the following points.
(1) A hygroscopic laminated film having at least a gas barrier layer and a hygroscopic heat seal layer, and an easily peelable laminated film having at least a gas barrier layer and an easily peelable heat seal layer, the surface of the hygroscopic heat seal layer Hygroscopic easily peelable packaging body obtained by superimposing and facing the surface of the easily peelable heat seal layer and heat-sealing the peripheral edge.
(2) The hygroscopic easily peelable packaging body according to the above (1), wherein the hygroscopic heat seal layer is made of a heat sealable resin containing a hygroscopic agent.
(3) The hygroscopic easily peelable packaging body according to (2) above, wherein the hygroscopic agent is a chemical hygroscopic agent.
(4) The hygroscopic easily peelable packaging body according to any one of (1) to (3), which is a packaging body for a blood glucose level measurement sensor.

  In the hygroscopic easily peelable package of the present invention, the innermost layer of the package exhibits hygroscopicity. Therefore, moisture inside the package can be absorbed quickly and efficiently, and deterioration of the product due to moisture can be prevented without filling the moisture absorbent.

  Moreover, since it does not fill with a hygroscopic agent, it is difficult to break the bag during transportation or storage, and the contents can be stably stored over a long period of time without damaging the gas barrier layer.

  Furthermore, since there is no need to fill the hygroscopic agent, the work efficiency is good and the manufacturing cost can be reduced. Moreover, since a hygroscopic agent is not accommodated, it can be set as a thin package which is not bulky, and a transportation cost is also reduced.

  Furthermore, among the two laminated films constituting the packaging body of the present invention, one is an easily peelable laminated film, so that it exhibits suitable easy peelability while exhibiting sufficient hermeticity and hygroscopicity. To do.

  Therefore, the hygroscopic easily peelable package of the present invention is a disposable blood pressure measuring sensor which is a disposable enzyme electrode used for monitoring blood sugar level by self-collection when a diabetic patient administers insulin. Especially suitable for packaging.

It is a schematic sectional drawing which shows the example about the layer structure of the hygroscopic easily peelable package of this invention. It is a schematic sectional drawing which shows another example about the layer structure of the hygroscopic easily peelable package of this invention.

  The above-described present invention will be described in more detail below.

<Layer structure of hygroscopic easily peelable package of the present invention>
FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of the hygroscopic easily peelable package of the present invention. As shown in FIG. 1, the package of the present invention comprises a hygroscopic laminated film (A) having a gas barrier layer (1) and a hygroscopic heat seal layer (2), and an easily peelable heat seal layer (3). And the easily peelable laminated film (B) having the gas barrier layer (4) and the surface of the hygroscopic heat seal layer 2 and the surface of the easily peelable heat seal layer (3) are opposed to each other, It is obtained by heat-sealing the peripheral edge.

Here, the hygroscopic heat seal layer (2) is a layer exhibiting hygroscopic properties and heat seal properties, and may have a single layer configuration or a multilayer configuration.
In the case of a single layer configuration, the hygroscopic heat seal layer is a layer made of a heat seal resin containing a hygroscopic agent.

  In the case of a multilayer structure, the hygroscopic heat seal layer has at least a layer made of a resin composition containing a hygroscopic agent and a binder resin, and a layer made of a heat sealable resin. Here, the binder resin may be a heat-sealable resin, and the layer made of the heat-sealable resin may contain a hygroscopic agent.

  For example, when the hygroscopic heat seal layer has a two-layer structure, one of the two layers, for example, the innermost layer of the package is made of a heat seal resin containing a hygroscopic agent, and the other The layer on the side facing the gas barrier layer may be made of a heat-sealable resin that does not contain a hygroscopic agent. Since the layer on the side facing the gas barrier layer does not contain a hygroscopic agent, the adhesive strength between the layers can be increased. Conversely, the innermost layer of the package is made of a heat-sealable resin containing no hygroscopic agent, and the layer facing the gas barrier layer is made of a heat-sealable resin containing a hygroscopic agent. Also good. With this configuration, the sealing strength of the package can be improved.

  In another embodiment, the hygroscopic heat seal layer may have a three-layer structure as shown in FIG. In this case, for example, heat-sealable resin layer (2a) containing no hygroscopic agent / intermediate layer (2b) made of a resin composition containing a hygroscopic agent and a binder resin / heat-sealable resin layer containing no hygroscopic agent (2c) ) Is preferable because the sealing strength and interlayer adhesion strength can be improved.

<Gas barrier layer in hygroscopic laminated film>
In the present invention, the gas barrier layer in the hygroscopic laminated film is not particularly limited, and may be a gas barrier film having a barrier property against a known or commercially available oxygen gas or water vapor.

  Specific examples of the gas barrier film suitably used in the present invention include resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polyvinyl alcohol, and ethylene / vinyl alcohol copolymer. The resin film which becomes can be mentioned.

  Further, any base film such as polyethylene resin, polypropylene resin, cyclic polyolefin resin, fluorine resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer ( ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resins such as PET and polyethylene naphthalate, polyamide resins such as various nylons, polyimide resins, From various resins such as polyamideimide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, acetal resin, cellulose resin, etc. Deposited film having a vapor deposited film such as a silica-deposited film or alumina-deposited film may be mentioned on at least one side of that film.

Furthermore, although the laminated film which laminated metal foil, such as aluminum foil, on the said base film can also be used, it is not limited to these.
Among the above-mentioned films, it is preferable to use a silica vapor-deposited film, an alumina vapor-deposited film, a laminated film laminated with an aluminum foil, or the like from the viewpoint of excellent gas barrier properties. In particular, by using an aluminum foil, light shielding properties can be imparted, and as a result, it can be suitably used as a package for products that are easily deteriorated by light irradiation.

Furthermore, you may provide the gas barrier coating film which is demonstrated below on the said vapor deposition film. Thereby, a further excellent gas barrier property can be obtained.
In the present invention, the gas barrier coating film is a gas barrier property obtained by hydrolysis and polycondensation of an alkoxide and a water-soluble polymer by the sol-gel method in the presence of a sol-gel method catalyst, acid, water and an organic solvent. It is a film formed by applying and drying the composition. In some cases, the gas barrier composition may further contain a silane coupling agent.

Examples of the alkoxide that can be used in the gas barrier composition include a general formula R ¹ _n M (OR ² ) _m (wherein R ¹ and R ² represent an organic group having 1 to 8 carbon atoms, M Represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n + m represents an atomic valence of M), and preferably at least one alkoxide represented by Can be used. Here, as the metal atom M, silicon, zirconium, titanium, aluminum or the like can be used. Specific examples of the organic group represented by R ¹ and R ² include alkyl groups such as a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, and an i-butyl group. Can be mentioned. In the same molecule, these alkyl groups may be the same or different. Examples of such alkoxides include tetramethoxysilane Si (OCH ₃ ) ₄ , tetraethoxysilane Si (OC ₂ H ₅ ) ₄ , tetrapropoxysilane Si (OC ₃ H ₇ ) ₄ , tetrabutoxysilane Si (OC _4). H ₉ ) _{4 and the} like.

  As the water-soluble polymer that can be used in the gas barrier composition, either a polyvinyl alcohol-based resin or an ethylene / vinyl alcohol copolymer or both can be preferably used.

  The sol-gel catalyst can be a tertiary amine, particularly N, N-dimethylbenzylamine, which is substantially insoluble in water and soluble in an organic solvent. Examples of the acid used in the gas barrier composition include mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid, and organic acids such as acetic acid and tartaric acid. Furthermore, as the organic solvent, for example, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, or the like can be used.

  The content of the water-soluble polymer in the gas barrier composition is preferably in the range of 5 to 500 parts by weight with respect to 100 parts by weight of the total amount of the alkoxide. In the above, if it exceeds 500 parts by weight, the formed gas barrier coating film becomes more brittle and its weather resistance and the like are also unfavorable.

When the gas barrier composition is applied onto the vapor deposition film and heated to remove the solvent and the alcohol produced by the polycondensation reaction, the polycondensation reaction is completed, and a transparent gas barrier coating film is formed. Here, since the hydroxyl group generated by hydrolysis and the silanol group derived from the silane coupling agent are bonded to the hydroxyl group on the surface of the deposited film, the adhesiveness between the deposited film and the gas barrier coating film is good. Become.
The gas barrier coating film may be a composite polymer layer in which one layer or two or more layers are laminated. Moreover, the dry film thickness may be 0.01-30 micrometers, Preferably the thickness may be 0.1-10 micrometers.

<Hygroscopic heat seal layer>
In this invention, it does not specifically limit as a hygroscopic agent contained in a hygroscopic heat seal layer, The well-known or commercially available material which has an absolutely dry effect or a humidity control effect can be used. The absolute dry effect indicates the effect of absorbing moisture up to near 0%, and the humidity control effect is the effect of absorbing moisture when the humidity is high and releasing moisture when the humidity is low to keep the humidity constant. Point to.

  In the present invention, those suitably used as the hygroscopic agent include, for example, silica gel, alumina gel, silica alumina gel, anhydrous magnesium sulfate, zeolite, synthetic zeolite, calcium oxide, calcium chloride, and calcined alum, or a mixture thereof. However, it is not limited to these.

  When used as a package for a blood glucose level measurement sensor, it is possible to prevent the re-release of moisture that has been absorbed once, and because it is stable over time in the low humidity state of the package, etc. A chemical hygroscopic agent having an effect is preferred. And by using the chemical hygroscopic agent which has an absolutely dry effect, as shown in Table 1, the humidity in the pouch bag can maintain a low value even after elapse of 7 days, for example.

  Further, by using the chemical hygroscopic agent, the amount of addition can be reduced as compared with the case of using a physical hygroscopic agent, and in some cases, the hygroscopic heat seal layer can also be configured as a single layer.

In the present invention, the binder resin mixed with the hygroscopic agent is not particularly limited as long as the hygroscopic agent can be stably held, and any resin can be used. In particular, a heat-sealable resin can be preferably used. The heat-sealable resin is not particularly limited, and a known or commercially available polyolefin resin having heat-sealability can be used.

  Examples of such polyolefin-based resins include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene (LLDPE), and the like, polypropylene, ethylene-vinyl acetate copolymer, ethylene- Ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, acid-modified polyolefin resin, and Although the mixture of these resin etc. are mentioned, it is not limited to these resins. In addition, any of an antioxidant, an anti-blocking agent and the like that is present in a small amount as an additive can also be applied.

  In particular, it is preferable to use low-density polyethylene, LLDPE, polypropylene, or the like in order to exhibit excellent heat sealability in a state containing a hygroscopic agent and not interfere with the hygroscopic effect of the hygroscopic agent.

  The amount of the hygroscopic agent added to the hygroscopic heat seal layer may be 1% by mass or more based on the total mass of the hygroscopic heat seal layer to which the hygroscopic agent is added, that is, the total mass of the hygroscopic additive layer. However, in order to obtain a good hygroscopic effect, the content is preferably 3% by mass or more. On the other hand, in order to obtain good film forming properties, the amount of the hygroscopic agent needs to be less than 55% by mass.

  The amount of the hygroscopic agent added is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, and more preferably 15% by mass to 50% by mass with respect to the total mass of the hygroscopic agent added layer of the hygroscopic heat seal layer. % By mass.

  In another embodiment, the hygroscopic heat seal layer may be a layer made of hygroscopic resin such as nylon or ethylene-vinyl acetate copolymer. Furthermore, the addition amount of the hygroscopic agent in the hygroscopic resin is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, and more preferably based on the total mass of the hygroscopic heat seal layer. It is 15 mass%-50 mass%.

As the thickness of the hygroscopic heat seal layer, film formation is possible if it is 5 μm or more, but preferably 10 μm to 200 μm in order to obtain good film forming property and hygroscopicity.
In one embodiment of the present invention, the adsorptive heat seal layer has a single-layer structure made of a resin composition obtained by kneading a hygroscopic agent in a heat sealable resin.

  In another embodiment, the hygroscopic heat seal layer has a multilayer structure having two or more layers, and each layer may be made of a resin composition in which the amount of the hygroscopic agent is different. In this configuration, there may be a layer made of only a heat-sealable resin without containing a hygroscopic agent.

  The hygroscopic agent may be uniformly dispersed in the layer. Further, for example, it may be dispersed with an increasing concentration gradient from the surface on the innermost layer side to the surface facing the gas barrier layer, and this configuration improves heat sealability. On the contrary, it may be dispersed with a decreasing concentration gradient from the surface on the innermost layer side to the surface facing the gas barrier layer, and this configuration improves interlayer adhesion strength.

  For example, in a hygroscopic package comprising an LDPE layer / hygroscopic heat seal layer (1) / hygroscopic heat seal layer (2), the hygroscopic heat seal layer (1) is more hygroscopic than the hygroscopic agent added. It can be appropriately selected depending on the use to make it larger than the heat-resistant heat seal layer (2) or vice versa.

  As a method of kneading the hygroscopic agent in the heat-sealable resin or binder resin, a known or conventional kneading method can be applied. For example, a so-called masterbatch-type blending method in which a moisture-absorbing agent is dispersed in a heat-sealable resin or a binder resin to produce a pellet-like masterbatch, which is dispersed again in the heat-sealable resin or binder resin. Even a hygroscopic agent that easily aggregates can be uniformly dispersed.

<Hygroscopic laminated film>
A hygroscopic laminated film is obtained by laminating the hygroscopic heat seal layer on the gas barrier film constituting the gas barrier layer.
In the present invention, this laminating method is not particularly limited, and the resin composition for forming the hygroscopic heat seal layer can be laminated by extrusion coating on the gas barrier film through the adhesive layer. In the extrusion coating, first, the resin composition is heated and melted, expanded and stretched in the necessary width direction with a T-die and extruded into a curtain shape, and the molten resin is allowed to flow down onto a gas barrier film, and then a rubber roll. And a cooled metal roll to simultaneously form a hygroscopic heat seal layer, adhere to a gas barrier film, and laminate.

  Here, the adhesive layer may be made of an arbitrary anchor coating agent, and for example, an organic titanium-based, isocyanate-based, polyethyleneimine-based, acid-modified polyethylene-based, polybutadiene-based anchor coating agent or the like can be used.

  Alternatively, a film made of the above resin composition may be formed, and this may be laminated with a gas barrier film via an adhesive layer by dry lamination, non-solvent lamination, sand lamination, or the like. Here, as a film forming method, a known or conventional film forming method can be applied. For example, when an inflation method is used as the film forming method, a heat-sealable resin that forms a hygroscopic heat seal layer Alternatively, the melt flow rate (MFR) of the binder resin is preferably 0.2 to 5.0 g / 10 min, and more preferably 0.2 to 4.0 g / 10 min. If the MFR is less than 0.2 g / 10 min or 5.0 g / 10 min or more, it is not effective in terms of proper processing. In addition, in this specification, MFR is a value measured from the method based on JISK7210.

In one embodiment of the present invention, the adhesive layer may be a layer made of an adhesive for dry laminate, an adhesive for non-solvent laminate, or the like.
When using an adhesive for dry laminating as an adhesive layer, the adhesive dispersed or dissolved in a solvent is applied onto one film and dried, and the other film is stacked and laminated at a temperature of 30 to 120 ° C. By aging from time to several days, the adhesive is cured and laminated.

  When using an adhesive for non-solvent laminating, the adhesive itself is applied on a film without being dispersed or dissolved in a solvent and dried, and the other film is laminated and laminated, and then at 30 to 120 ° C. for several hours. Aged for several days to cure and laminate the adhesive.

  These adhesives may be thermosetting, ultraviolet curable, electron beam curable, or the like. Examples of such adhesives include polyvinyl acetate adhesives such as polyvinyl acetate and vinyl acetate-ethylene copolymers, and polyacrylic acid composed of copolymers of polyacrylic acid and polystyrene, polyester, polyvinyl acetate, and the like. Adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives made of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, cellulose adhesives, polyurethane adhesives Polyester adhesive, polyamide adhesive, polyimide adhesive, polyolefin adhesive, amino resin adhesive made of urea resin or melamine resin, phenol resin adhesive, epoxy adhesive, reactive type (meta ) Acrylic adhesives, chloroprene rubber, nitrile rubber, styrene-butadiene rubber, etc. Ranaru elastomeric adhesive, a silicone adhesive, an alkali metal silicate, inorganic adhesive or the like made of a low-melting glass.

  In addition, the adhesive may be in any form such as aqueous type, solution type, emulsion type, dispersion type, and the property may be any form such as film / sheet shape, powder shape, solid shape, Further, 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 is formed by applying the above-mentioned adhesive by, for example, roll coating, gravure roll coating, kiss coating, etc., 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 another embodiment of the present invention, the gas barrier film and the film forming the hygroscopic heat seal layer may be laminated by sand lamination. In this case, any resin that can be heated and melted and applied by an extruder can be used for the adhesive layer. Specifically, the resins mentioned as the heat sealable resin can be preferably used.
Moreover, in this invention, the hygroscopic laminated | multilayer film may have a further layer other than a gas barrier layer and a hygroscopic heat seal layer.

<Gas barrier layer in easily peelable laminated film>
In the present invention, the gas barrier layer in the easily peelable laminated film may be a gas barrier film having a barrier property against a known or commercially available oxygen gas or water vapor, preferably a gas barrier film used in the above-described hygroscopic laminated film. Can be used.

Moreover, visibility can be provided to a packaging body by using a gas barrier film excellent in transparency, for example, a silica vapor deposition film, as a gas barrier layer of an easily peelable non-laminate film. Thereby, before opening, it can use especially suitably as a package body of a product for which it is preferable to confirm an internal state from the outside of a package body, for example, a package body of a blood glucose level measurement sensor.
In this invention, IB-PET-RB (made by Dai Nippon Printing Co., Ltd.) is mentioned as a gas barrier film used especially suitably as a gas barrier layer in an easily peelable laminated | multilayer film.

<Easily peelable heat seal layer>
In the present invention, the easily peelable heat-seal layer is compatible with the heat-sealable resin that is compatible with the heat-sealable resin constituting the opposite hygroscopic or non-hygroscopic heat-seal layer. It consists of a resin composition containing resin. The layer composed of such a resin composition has a so-called “sea-island structure” in which a resin having a higher component ratio forms a sea part and a resin having a lower component ratio forms an island part. And the domain which consists of resin which forms an island part is disperse | distributing in the resin phase which forms a sea part.

  For example, when the heat-sealable resin constituting the opposing heat-seal layer is a polyethylene resin, the easily peelable heat-seal layer may be any heat-sealable resin that is incompatible with the polyethylene resin, such as polypropylene or polystyrene. And a resin composition containing polybutene or the like.

  In another aspect, when the heat-sealable resin that constitutes the opposing heat-seal layer is a polypropylene resin, the easily peelable heat-seal layer is a polypropylene resin and any heat-sealable resin that is incompatible with this, for example, , Polyethylene resin, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer and the like.

  In yet another embodiment, when the heat-sealable resin constituting the opposing heat-seal layer is an ethylene-vinyl acetate copolymer, the easily peelable heat-seal layer is an ethylene-vinyl acetate copolymer or compatible with this. Any heat-sealable resin, for example, a polyethylene resin, and any heat-sealable resin incompatible therewith, for example, polypropylene, polybutene 1 or the like may be used.

  As the resin suitably used for constituting the resin composition in the present invention, a known or commercially available heat-sealable resin can be used. For example, polyethylene (low density polyethylene, medium density polyethylene, High density polyethylene, linear low density polyethylene), polypropylene, polybutene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-acrylic acid copolymer From the ethylene-ethyl acrylate copolymer, the ethylene-propylene copolymer, and derivatives thereof, for example, acid-modified derivatives, compatible and incompatible resins depending on the configuration of the opposing heat seal layer. It can be selected, but is not limited to these.

  The mixing ratio of the compatible resin and the incompatible resin of the resin composition can be adjusted so that the package of the present invention exhibits a desired peel strength according to the packaging application. Resin / incompatible resin = mass ratio of 50/50 to 99/1, preferably 70/30 to 97/3, more preferably 70/30 to 90/10. .

A commercially available easily peelable heat seal film can also be used as the easily peelable heat seal layer. For example, when the heat-sealable resin constituting the opposing heat-seal layer is a polyethylene resin, SMX-Y03, SMX-Y04, IMX (J-Film Co., Ltd.) and the like made of a resin composition containing polyethylene, polypropylene and polystyrene Can be suitably used.
In the present invention, as the thickness of the easily peelable heat seal layer, film formation is possible if it is 3 μm or more, but in order to obtain good film forming properties and hygroscopicity, it is preferably 5 to 200 μm.

<Easily peelable laminated film>
By laminating the easily peelable heat seal layer on the gas barrier film constituting the gas barrier layer, an easily peelable laminated film is obtained.

In the present invention, the laminating method is not particularly limited, and it can be laminated by extrusion coating, dry lamination, non-solvent lamination, sand lamination, or the like, similarly to the hygroscopic laminated film.

  Moreover, the easily peelable laminated film may have a further layer in addition to the gas barrier layer and the easily peelable heat seal layer. For example, you may have said hygroscopic heat seal layer between a gas barrier layer and an easily peelable heat seal layer. Or an easily peelable heat seal layer may contain the above-mentioned hygroscopic agent, and may have both easy peelability and moisture absorption. When the easily peelable heat seal layer also has hygroscopicity, the addition amount is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, and more preferably, with respect to the total mass of the hygroscopic agent addition layer. Is 15% by mass to 50% by mass.

<Packaging body>
The package of the present invention comprises the above hygroscopic laminated film and the easily peelable laminated film, with the surface of the hygroscopic heat seal layer and the surface of the easily peelable heat seal layer facing each other, and heats the peripheral portion. Sealed.

  For example, one of the two sheets may be a hygroscopic laminated film having a hygroscopic heat seal layer, and the other may be an easily peelable laminated film having an easy peelable heat seal layer. Alternatively, one of the two sheets may be a hygroscopic easily peelable laminated film, and the other may be a normal gas barrier laminated film that does not exhibit any properties.

  In the present invention, publicly 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 heat seal method.

<Example 1>
A hygroscopic resin composition containing 35% by mass of calcium oxide in a polyethylene resin (Daiichi Seika Kogyo Co., Ltd., Pericon) and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) are subjected to an inflation method (extrusion temperature). 180 ° C.) to produce a hygroscopic heat-sealable resin film of LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 35 mass%) 60 μm / LLDPE layer 10 μm.

PET film (thickness 12 μm, Toyobo Co., Ltd., Espet T4102), aluminum foil (thickness 9 μm, Toyo Aluminum Co., Ltd.) and dry laminate adhesive (Rock Paint Co., Ltd.) ), RU004 / H-1, application amount 3.5 g / m ^{2 for} each adhesive layer, drying temperature 70 ° C.), PET film / adhesive / aluminum foil / adhesive / hygroscopic heat-sealable resin A hygroscopic laminated film having a layer structure of the film was produced.

On the other hand, PET film (thickness 12 μm, Toyobo Co., Ltd., Espet T4102), aluminum foil (thickness 9 μm, Toyo Aluminum Co., Ltd.), and easily peelable heat sealable resin film (J Film Co., Ltd., SMX) -Y04) is bonded via an adhesive for dry lamination (Rock Paint Co., Ltd., RU004 / H-1, coating amount 3.5 g / m ^{2 for} each adhesive layer, drying temperature 70 ° C.) An easily peelable laminated film having a layer configuration of adhesive / aluminum foil / adhesive / easy peelable heat-sealable resin layer was produced.

The hygroscopic laminate film and the easily peelable laminate film obtained above are overlapped with the surface of the hygroscopic heat sealable resin film facing the surface of the easily peelable heat sealable resin film, and the peripheral edge thereof. Was heat-sealed under the conditions of 160 ° C., 1 kgf / cm ² , and 1 second to produce a hygroscopic easily peelable packaging body of the present invention.

<Example 2>
The hygroscopic easily peelable packaging body of the present invention is produced in the same manner as in Example 1 except that Sasaki Chemical Co., Ltd. and Drykeep ^(R) SPES30-132J are used as the hygroscopic heat sealable resin film. did.

<Example 3>
As a gas barrier layer in an easily peelable laminated film, instead of a gas barrier film obtained by laminating an aluminum foil on a PET film, a silicon oxide vapor deposition film (thickness) is formed on the PET film (thickness 12 μm) by chemical vapor deposition. Gas barrier coating film / deposition film / PET by applying a gas barrier film (Dai Nippon Printing Co., Ltd., IB-PET-RB) provided with a gas barrier coating film (thickness 200 nm). The hygroscopic easily peelable packaging body of the present invention was produced in the same manner as in Example 1 except that an easily peelable laminated film having a layer structure of film / adhesive / easy peelable heat sealable resin film was used. .

<Example 4>
As a gas barrier layer in an easily peelable laminated film and a hygroscopic laminated film, instead of a gas barrier film formed by laminating an aluminum foil on a PET film, a chemical vapor deposition method is used on a PET film (thickness 12 μm). Gas barrier coating by applying a gas barrier film (Dai Nippon Printing Co., Ltd., IB-PET-RB) provided with a silicon oxide vapor deposition film (thickness 10 nm) and a gas barrier coating film (thickness 200 nm). Laminated film having a layer structure of film / deposited film / PET film / adhesive / easy peelable heat-sealable resin film and gas barrier coating film / deposited film / PET film / adhesive / hygroscopic heat-sealable resin film A hygroscopic easily peelable package of the present invention was produced in the same manner as in Example 1 except that was used.

<Example 5>
As an easily peelable laminated film, the hygroscopic heat sealable resin film produced in Example 1 was laminated between an aluminum foil and an easily peelable heat sealable resin film via an adhesive for dry lamination, and PET Example 1 except that an easily peelable laminated film having a layer structure of film / adhesive / aluminum foil / adhesive / hygroscopic heat sealable resin film / adhesive / easy peelable heat sealable resin film was produced. Similarly, the hygroscopic easily peelable package of the present invention was produced.

<Example 6>
As an easily peelable laminated film, the hygroscopic heat sealable resin film produced in Example 1 was laminated between a PET film and an easily peelable heat sealable resin film via an adhesive for dry lamination, and a gas barrier The same as Example 4 except that an easily peelable laminated film having a layer structure of adhesive coating film / deposited film / PET film / adhesive / hygroscopic heat sealable resin film / easy peelable heat sealable resin film was produced. Thus, the hygroscopic easily peelable packaging body of the present invention was produced.

<Example 7>
The hygroscopic easily peelable packaging body of the present invention is produced in the same manner as in Example 1 except that Sasaki Chemical Co., Ltd. and Drykeep ^(R) SPES30-111J are used as the hygroscopic heat sealable resin film. did.

<Example 8>
Dry-keep ^(R) (Sasaki Chemical Co., Ltd., SPES30-132J, film thickness 60 μm) is used for the hygroscopic heat-sealable resin film of the hygroscopic laminated film, and the easy-peelable heat-sealable resin of the easily peelable laminated film. A hygroscopic easily peelable package of the present invention was produced in the same manner as in Example 3 except that IMX (J-Film Co., Ltd.) was used for the film.

<Example 9>
A hygroscopic resin composition containing 50% by mass of calcium oxide in a polyethylene resin (Daiichi Seika Kogyo Co., Ltd., Pericon) and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) are subjected to an inflation method (extrusion temperature). 180 ° C.) and coextruded to produce a hygroscopic heat-sealable resin film of LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 50 mass%) 30 μm / LLDPE layer 10 μm. Similarly, the hygroscopic package of the present invention was produced.

<Example 10>
A hygroscopic resin composition containing 15% by mass of calcium oxide in a polyethylene resin (Daiichi Seika Kogyo Co., Ltd., Pericon) and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) are subjected to an inflation method (extrusion). Example 1 except that a coextruded film was formed at a temperature of 180 ° C. to produce a hygroscopic heat-sealable resin film of LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 15% by mass) 30 μm / LLDPE layer 10 μm. In the same manner as described above, a hygroscopic package of the present invention was produced.

<Example 11>
A hygroscopic resin composition containing 35% by mass of calcium oxide in a polyethylene resin (Daiichi Seika Kogyo Co., Ltd., Pericon) and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) are subjected to an inflation method (extrusion). Example 1 except that a coextruded film was produced at a temperature of 180 ° C. to produce a hygroscopic heat-sealable resin film of LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 35 mass%) 30 μm / LLDPE layer 10 μm. In the same manner as described above, a hygroscopic package of the present invention was produced.

<Comparative Example 1>
The hygroscopic layer of the hygroscopic laminated film is a heat seal layer (thickness 50 μm) made of LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) containing no hygroscopic agent, and the easy peelable heat sealable property of the easy peelable laminated film. A laminated film and a package were produced in the same manner as in Example 1 except that the resin layer was a heat seal layer (thickness: 50 μm) made of only LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F).

<Hygroscopic effect>
A pouch bag (120 mm × 160 mm) was prepared from the laminated films prepared in Examples and Comparative Examples, a hygrometer was placed in the pouch, and the relative humidity after being left for 7 days was measured. The evaluation results are shown in Table 1.

<Easy peelability test>
The hygroscopic laminated film and the easily peelable laminated film produced in Examples and Comparative Examples were each cut into 10 cm × 10 cm and laminated so that the respective heat seal surfaces face each other, and a heat seal tester (tester industry: TP-701). A) was used to prepare a sample in which a region of 1 cm × 10 cm was heat-sealed under the conditions of 160 ° C., 1 kgf / cm ² , and 1 second (the end portion was not bonded without being heat-sealed and divided into two forks) State). Tensile strength when this sample was cut into a strip with a width of 1.5 cm and each end divided into two forks was attached to a tensile tester and tested under conditions of a test speed of 300 mm / min and a load range of 50 N. (N / 15 mm) was measured. The evaluation results are shown in Table 1.

上記のとおり、実施例１〜１１の包装体は、良好な吸湿効果並びに易剥離性を示した。

As above-mentioned, the package of Examples 1-11 showed the favorable hygroscopic effect and easy peelability.

A. Hygroscopic laminated film Easy peelable laminated films 1, 4. 1. Gas barrier layer 2. Hygroscopic heat seal layer 2a, 2c Heat seal resin layer 2b containing no hygroscopic agent Intermediate layer Easy peelable heat seal layer

Claims (4)

  A hygroscopic laminated film having at least a gas barrier layer and a hygroscopic heat seal layer, and an easily peelable laminated film having at least a gas barrier layer and an easy peelable heat seal layer, the surface of the hygroscopic heat seal layer and the easy A hygroscopic easily peelable package obtained by superposing the peelable heat seal layer facing each other and heat-sealing the peripheral edge.   The hygroscopic easily peelable packaging body according to claim 1, wherein the hygroscopic heat seal layer is made of a heat sealable resin containing a hygroscopic agent.   The hygroscopic easily peelable package according to claim 2, wherein the hygroscopic agent is a chemical hygroscopic agent.   The hygroscopic easily peelable packaging body according to any one of claims 1 to 3, which is a packaging body for a blood glucose level measurement sensor.

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