JP6648806B2 - Hygroscopic easy peeling package - Google Patents

Description

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

  In a package for packaging a product which dislikes moisture such as a biosensor, for example, a blood glucose measurement sensor (glucose sensor, enzyme electrode), etc., in order to remove moisture inside, a moisture absorbent such as silica gel is filled together with the product. Are known (Patent Documents 1 and 2).

  However, by filling such a moisture absorbent, there is a problem that irregularities are generated on the surface of the package and the bag is easily broken. Further, even if the bag is not broken, there is a problem that the gas barrier layer provided in the laminated film constituting the package is impaired in order to prevent the invasion of water vapor. In addition, there is a problem that unevenness is generated by filling the absorbent, the package becomes bulky, the filling property at the time of packing is reduced, and the transportation cost is increased.

In addition, there is a problem in that the moisture absorbent is crushed in the bag during transportation or storage, and the fragments or powder adhere to the contents of the blood glucose level measurement sensor and the like, thereby causing an adverse effect.
Further, there is a problem that the number of steps for filling the hygroscopic agent is increased, the working efficiency is reduced, and the manufacturing cost is increased.

Japanese Patent No. 4138070 Japanese Patent No. 4422285

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

  The present inventors, as a result of various studies, a moisture-absorbing laminated film having at least a gas barrier layer and a moisture-absorbing 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 heat-absorbable heat-sealable layer and the surface of the heat-sealable heat-sealable layer are overlapped with each other facing each other, and the peripheral portion is heat-sealed to achieve the above object. I found that.

And this invention is characterized by the following points.
(1) A moisture-absorbing laminated film having at least a gas barrier layer and a moisture-absorbing heat seal layer, and an easily peelable laminated film having at least a gas barrier layer and an easily peelable heat seal layer, A moisture-absorbing easily peelable package obtained by superposing the heat-sealable layer and the surface of the heat-sealable layer facing each other and heat-sealing the peripheral portion.
(2) The hygroscopic easy-peelable package according to (1), wherein the hygroscopic heat seal layer is made of a heat seal resin containing a hygroscopic agent.
(3) The hygroscopic easy-peelable package according to (2), wherein the hygroscopic agent is a chemical hygroscopic agent.
(4) The hygroscopic easy-peelable package according to any one of (1) to (3) above, which is a package for a blood sugar level measurement sensor.

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

  In addition, since the absorbent is not filled, the bag is not easily broken during transportation or storage, and the contents can be stably stored for a long time without damaging the gas barrier layer.

  Further, since there is no need to fill in the hygroscopic agent, the working efficiency is good and the manufacturing cost can be reduced. In addition, since no moisture absorbent is contained, the package can be made thin and not bulky, and the transportation cost can be reduced.

  Furthermore, of the two laminated films constituting the package of the present invention, one is an easily peelable laminated film, so that while exhibiting sufficient sealing properties and moisture absorption, simultaneously exhibiting suitable easy peelability. I do.

  Therefore, the moisture-absorbing easily peelable package of the present invention is a disposable enzyme electrode used for monitoring blood glucose level by self-collecting blood, for example, when a diabetic patient administers insulin. Especially suitable for packaging.

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

  The present invention will be described in more detail below.

<Layer configuration of moisture-absorbing easily peelable package of the present invention>
FIG. 1 is a schematic cross-sectional view showing an example of the layer configuration of the moisture-absorbing easily peelable package of the present invention. As shown in FIG. 1, the package of the present invention comprises a moisture-absorbent laminated film (A) having a gas barrier layer (1) and a moisture-absorbent heat seal layer (2), and an easily peelable heat seal layer (3). And an easily peelable laminated film (B) having a gas barrier layer (4) and a surface of the heat-absorptive heat seal layer 2 and a surface of the easily peelable heat seal layer (3). It is obtained by heat sealing the peripheral portion.

Here, the hygroscopic heat seal layer (2) is a layer showing hygroscopicity and heat sealability, 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 moisture-absorbing heat seal layer has at least a layer made of a resin composition containing a moisture absorbent and a binder resin, and a layer made of a heat sealable resin. Here, the binder resin may be a heat-sealing resin, and the layer made of the heat-sealing resin may contain a moisture absorbent.

For example, when the moisture-absorbing heat-sealing layer has a two-layer structure, one of the two layers, for example, the layer on the innermost layer side of the package is made of a heat-sealing resin containing a moisture-absorbing agent, and the other. The layer on the side facing the gas barrier layer may be made of a heat-sealing resin containing no hygroscopic agent. Since the layer on the side facing the gas barrier layer does not contain a moisture absorbent, the adhesive strength between the layers can be increased. Conversely, the layer on the side that becomes the innermost layer of the package is made of a heat-sealing resin containing no moisture absorbent, and the layer on the side facing the gas barrier layer is made of the heat-sealing resin containing the moisture absorbent. Is 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 configuration as shown in FIG. In this case, for example, the heat-sealable resin layer (2a) containing no hygroscopic agent / the intermediate layer (2b) made of a resin composition containing the hygroscopic agent and the binder resin / the heat-sealable resin layer (2c) containing no hygroscopic agent ) Is preferable because the sealing strength and the 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 known or commercially available gas barrier film having a barrier property against oxygen gas or water vapor.

  Specific examples of the gas barrier film preferably 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. Resin film.

  In addition, any base film, for example, 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 resin such as PET and polyethylene naphthalate, polyamide resin such as various nylons, polyimide resin, Polyamide imide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone 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, a laminated film obtained by laminating a metal foil such as an aluminum foil on the above-mentioned base film can also be used, but is not limited thereto.
Among the above films, it is preferable to use a silica-deposited film, an alumina-deposited film, a laminated film obtained by laminating an aluminum foil, or the like, from the viewpoint of excellent gas barrier properties. In addition, the use of an aluminum foil can provide a light-shielding property, so that it can be suitably used as a package of a product which is easily deteriorated by light irradiation.

Further, a gas barrier coating film as described below may be provided on the above-mentioned deposited film. Thereby, more excellent gas barrier properties 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 a sol-gel method in the presence of a sol-gel catalyst, an acid, water and an organic solvent. This is a film formed by applying and drying the composition. The gas barrier composition may optionally further contain a silane coupling agent.

Alkoxides that can be used in the gas barrier composition include those represented by the 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, and m represents Or an integer of 1 or more, and n + m represents the valence of M.) At least one or more alkoxides can be preferably 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, for example, an alkyl group 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. Such alkoxides include, for example, 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.

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

The sol-gel method catalyst may be a tertiary amine which is substantially insoluble in water and soluble in an organic solvent, particularly N, N-dimethylbenzylamine. As the acid used in the gas barrier composition, for example, mineral acids such as sulfuric acid, hydrochloric acid, and nitric acid, and organic acids such as acetic acid and tartaric acid can be used. Further, as the organic solvent, for example, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol and 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 based on 100 parts by weight of the total amount of the alkoxide. In the above, when the amount exceeds 500 parts by weight, the brittleness of the formed gas barrier coating film is increased, and the weather resistance and the like are undesirably reduced.

When the above-mentioned gas barrier composition is applied on a vapor-deposited film and heated to remove the solvent and the alcohol generated 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 the hydrolysis and the silanol group derived from the silane coupling agent are combined with the hydroxyl group on the surface of the vapor-deposited film, the adhesiveness between the vapor-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 stacked. The thickness may be such that the dry film thickness is 0.01 to 30 μm, preferably 0.1 to 10 μm.

<Hygroscopic heat seal layer>
In the present invention, the hygroscopic agent contained in the hygroscopic heat seal layer is not particularly limited, and a known or commercially available material having a bone-drying effect or a humidity control effect can be used. The absolute drying effect refers to the effect of absorbing moisture up to a relative humidity of about 0%, and the humidity control effect refers to the effect of absorbing moisture when the humidity is high and releasing moisture when the humidity is low to keep the humidity constant. Point.

  In the present invention, those preferably used as a moisture absorbent 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. But not limited thereto.

When used as a package for a blood glucose level measurement sensor, in particular, the absolute drying of calcium oxide, magnesium sulfate, etc. should be prevented due to the fact that once released moisture is prevented from being re-released and the stability of the package in low humidity over time. Chemical hygroscopic agents having an effect are preferred. And, as shown in Table 1, the humidity in the pouch bag can be maintained at a low value even after 7 days, for example, by using a chemical moisture absorbent having an absolute drying effect.

  Further, by using the above-mentioned chemical hygroscopic agent, the amount of addition can be reduced as compared with the case where a physical hygroscopic agent is used, and in some cases, the hygroscopic heat seal layer can be formed into a single layer structure.

In the present invention, the binder resin mixed with the moisture absorbent is not particularly limited as long as the binder resin can stably retain the moisture absorbent, and any resin can be used. In particular, a heat-sealing resin can be preferably used. The heat-sealing resin is not particularly limited, and a known or commercially available heat-sealing polyolefin resin can be used.

  Examples of such a polyolefin resin include polyethylene such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) low-density polyethylene (LLDPE), polypropylene, ethylene-vinyl acetate copolymer, and 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 Examples thereof include a mixture of these resins, but are not limited to these resins. In addition, those in which a small amount of any one of an antioxidant, an antiblocking agent, and the like is present 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 sealing properties in a state containing a moisture absorbent and not to hinder the moisture absorbing effect of the moisture absorbent.

  The amount of the hygroscopic agent to be added to the hygroscopic heat seal layer is 1% by mass or more with respect to the total mass of the layer to which the hygroscopic agent is added in the hygroscopic heat seal layer, that is, the total mass of the hygroscopic agent added layer. Although it is possible to show a moisture absorbing effect, it is preferably at least 3% by mass in order to obtain a good moisture absorbing effect. On the other hand, in order to obtain good film-forming properties, the amount of the moisture absorbent added needs to be less than 55% by mass.

  The amount of the hygroscopic agent to be added is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, more preferably 15% by mass to 50% by mass relative 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 a hygroscopic resin such as nylon or ethylene-vinyl acetate copolymer. Further, the amount of the hygroscopic agent in such a hygroscopic resin is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, and more preferably 3% by mass to the total mass of the hygroscopic heat sealing layer. It is 15% by mass to 50% by mass.

The thickness of the above-mentioned moisture-absorbing heat seal layer can be formed as long as it is 5 μm or more, but is preferably 10 μm to 200 μm in order to obtain good film-forming properties and hygroscopicity.
In one embodiment of the present invention, the adsorptive heat seal layer has a single-layer structure composed of a resin composition obtained by kneading a moisture absorbent into a heat seal resin.

  In yet another embodiment, the hygroscopic heat seal layer has a multi-layer configuration having two or more layers, wherein each layer may be made of a resin composition having a different amount of the hygroscopic agent. In this configuration, there may be a layer made of only a heat-sealing resin without containing a moisture absorbent.

  The desiccant may be evenly dispersed in the layer. Further, for example, the particles may be dispersed with an increasing concentration gradient from the innermost layer surface to the surface facing the gas barrier layer, and this configuration improves the heat sealability. Conversely, it may be dispersed with a decreasing concentration gradient from the innermost layer surface to the surface facing the gas barrier layer, and this configuration improves the interlayer adhesion strength.

  For example, in a hygroscopic package comprising an LDPE layer / a hygroscopic heat seal layer (1) / a hygroscopic heat seal layer (2), the amount of the hygroscopic agent to be added is determined by the hygroscopic heat seal layer (1). The size may be larger than that of the heat-sealable layer (2), or may be smaller than that of the heat-sealable layer (2).

  As a method of kneading the hygroscopic agent into the heat-sealing resin or the binder resin, a known or commonly used kneading method can be applied. For example, a hygroscopic agent is dispersed in a heat-sealable resin or a binder resin to prepare a pellet-shaped masterbatch, which is dispersed again in the heat-sealable resin or the binder resin, by a so-called masterbatch type blending method. Even a hygroscopic agent that easily aggregates can be uniformly dispersed.

<Hygroscopic laminated film>
By laminating the hygroscopic heat seal layer on the gas barrier film constituting the gas barrier layer, a hygroscopic laminated film is obtained.
In the present invention, the lamination method is not particularly limited, but the lamination can be performed by extrusion coating the resin composition forming the hygroscopic heat seal layer on the gas barrier film via the adhesive layer. In the extrusion coating, first, the resin composition is heated and melted, expanded and expanded in a required width direction with a T die, extruded in a curtain shape, and the molten resin is caused to flow down onto a gas barrier film, and a rubber roll is formed. And a cooled metal roll, thereby simultaneously forming a hygroscopic heat seal layer, bonding to the gas barrier film, and laminating.

  Here, the adhesive layer may be made of any anchor coating agent, and for example, an anchor coating agent such as an organic titanium-based, isocyanate-based, polyethyleneimine-based, acid-modified polyethylene-based, or polybutadiene-based anchor coating agent 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 commonly used film forming method can be applied.For example, when an inflation method is used as a film forming method, a heat-sealing resin for forming a hygroscopic heat-sealing layer is used. Alternatively, the melt flow rate (MFR) of the binder resin is preferably from 0.2 to 5.0 g / 10 min, and more preferably from 0.2 to 4.0 g / 10 min. MFR is 0.2g / 10mi
If it is less than n or 5.0 g / 10 min or more, it is not effective in terms of proper processing. In this specification, the MFR is a value measured by a method based on JIS K7210.

In one embodiment of the present invention, the adhesive layer may be a layer made of an adhesive for dry lamination, an adhesive for non-solvent lamination, or the like.
When an adhesive for dry lamination is used as the adhesive layer, the adhesive dispersed or dissolved in a solvent is applied on one film and dried, and the other film is laminated and laminated. After aging for several hours to several days, the adhesive is cured and laminated.

  When using an adhesive for non-solvent lamination, the adhesive itself is applied to a film without being dispersed or dissolved in a solvent and dried, and the other film is stacked and laminated, and then at 30 to 120 ° C. for several hours. After aging for several days, the adhesive is cured and laminated.

  These adhesives may be of a thermosetting type, an ultraviolet curing type, an electron beam curing type, or the like. Examples of such adhesives include polyvinyl acetate adhesives such as polyvinyl acetate and vinyl acetate-ethylene copolymer, and polyacrylic acid comprising a copolymer of polyacrylic acid and polystyrene, polyester, polyvinyl acetate, and the like. Adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives composed of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc., cellulose adhesives, polyurethane adhesives , Polyester-based adhesive, polyamide-based adhesive, polyimide-based adhesive, polyolefin-based adhesive, amino resin-based adhesive composed of urea resin or melamine resin, phenolic resin-based adhesive, epoxy-based adhesive, reactive type (meta ) Acrylic adhesive, 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 an aqueous type, a solution type, an emulsion type, and a dispersion type, and may be in any form such as a film / sheet form, a powder form, and a solid form. Further, the bonding mechanism may be any form such as a chemical reaction type, a solvent volatilization type, a hot-melt type, and a hot-pressure type.

The adhesive layer is formed by applying the above adhesive with, for example, a roll coat, a gravure roll coat, a kiss coat, 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 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, for the adhesive layer, any resin that can be heated and melted and applied by an extruder can be used. Specifically, the resins listed above as the heat sealing resin can be preferably used.
Further, in the present invention, the moisture-absorbing laminated film may have another layer in addition to the gas barrier layer and the moisture-absorbing 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, and the gas barrier film used in the above-described moisture-absorbing laminated film is preferable. Can be used.

Further, by using a gas barrier film having excellent transparency, for example, a silica vapor-deposited film as the gas barrier layer of the easily peelable non-laminated film, visibility can be imparted to the package. Thereby, it can be used particularly suitably as a package of a product in which it is preferable to check the internal state from the outside before opening, for example, a package of a blood glucose level measurement sensor.
In the present invention, IB-PET-RB (manufactured by Dai Nippon Printing Co., Ltd.) is particularly preferably used as the gas barrier layer in the easily peelable laminated film.

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

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

  In yet another embodiment, when the heat-sealing resin constituting the opposed heat-sealing layer is a polypropylene resin, the easily peelable heat-sealing layer is any heat-sealing resin incompatible with the polypropylene resin, for example, , A polyethylene resin, an ethylene-vinyl acetate copolymer, an ethylene-methacrylic acid copolymer, or the like.

  In still 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 And a resin composition containing any heat-sealable resin such as polyethylene resin or the like and any heat-sealable resin incompatible therewith, such as polypropylene or polybutene 1.

  In the present invention, as the resin suitably used to constitute the resin composition, known or commercially available heat-sealable resins can be used. For example, the above-mentioned polyethylenes (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 , Ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer, and derivatives thereof, for example, acid-modified derivatives, etc., depending on the configuration of the facing heat seal layer, compatible and incompatible resin 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 its packaging use. Resin / immiscible resin = weight ratio of 50/50 to 99/1, preferably 70/30 to 97/3, more preferably 70/30 to 90/10. .

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

<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, this lamination method is not particularly limited, and can be laminated by extrusion coating or by dry lamination, non-solvent lamination, sand lamination or the like, similarly to the above-mentioned hygroscopic laminated film.

  Further, the easily peelable laminated film may have an additional layer in addition to the gas barrier layer and the easily peelable heat seal layer. For example, the above-mentioned hygroscopic heat seal layer may be provided between the gas barrier layer and the easily peelable heat seal layer. Alternatively, the easily peelable heat seal layer may include the above-described moisture absorbent and have both easy peelability and moisture absorption. When the easily peelable heat seal layer also has a hygroscopic property, its addition amount is 1% by mass to 50% by mass, preferably 3% by mass to 50% by mass, more preferably 3% by mass with respect to the total mass of the hygroscopic agent added layer. Is 15% by mass to 50% by mass.

<Package>
The package of the present invention, the hygroscopic laminated film and the easily peelable laminated film are laminated with the surface of the hygroscopic heat seal layer and the surface of the easily peelable heat seal layer facing each other, and the peripheral edge is heated. Seal it.

  For example, one of the two sheets may be a moisture-absorbing laminated film having a moisture-absorbing heat seal layer, and the other may be an easily peelable laminated film having an easily peelable heat seal layer. Alternatively, one of the two sheets may be a moisture-absorbing and easily peelable laminated film, and the other may be a normal gas-barrier laminated film showing neither property.

  In the present invention, as a heat sealing method, for example, known methods such as a bar seal, a rotating roll seal, a belt seal, an impulse seal, a high-frequency seal, and an ultrasonic seal can be applied.

<Example 1>
A hygroscopic resin composition (Dainichi Seika Kogyo Co., Ltd., Pericon) containing 35% by mass of calcium oxide in a polyethylene resin, and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2
022F) by co-extrusion using an inflation method (extrusion temperature: 180 ° C.), and an LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 35 mass%) 60 μm / LLDPE layer 10 μm hygroscopic heat-sealing resin film Was manufactured.

The obtained film was combined with a PET film (thickness 12 μm, Toyobo Co., Ltd., Espet T4102), an aluminum foil (thickness 9 μm, Toyo Aluminum Co., Ltd.), and an adhesive for dry lamination (Rock Paint Co., Ltd.). ), RU004 / H-1, applied 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 film layer configuration was manufactured.

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-sealing resin film (J-Film Co., Ltd., SMX -Y04) via an adhesive for dry lamination (Rock Paint Co., Ltd., RU004 / H-1, 3.5 g / m ^{2 for} each adhesive layer, drying temperature 70 ° C.), and PET film / An easily peelable laminated film having a layer structure of adhesive / aluminum foil / adhesive / easy peeling heat sealable resin layer was produced.

The moisture-absorbing laminated film and the easily peelable laminated film obtained above are overlapped with the surface of the moisture-absorbing heat-sealing resin film and the surface of the easily peelable heat-sealing resin film facing each other. Was heat-sealed at 160 ° C. under 1 kgf / cm ² for 1 second to produce a moisture-absorbing easily peelable package of the present invention.

<Example 2>
Sasaki Chemical Co., Ltd., DryKeep ^(R) as a hygroscopic heat-sealable resin film
Except having used SPES30-132J, it carried out similarly to Example 1, and manufactured the hygroscopic easy peeling package of this invention.

<Example 3>
As a gas barrier layer in the easily peelable laminated film, instead of a gas barrier film obtained by laminating an aluminum foil on a PET film, a silicon oxide vapor-deposited film (thickness) is formed on a PET film (12 μm thick) by a chemical vapor deposition method. Gas barrier coating film (Dainippon Printing Co., Ltd., IB-PET-RB) provided with a gas barrier coating film (thickness: 200 nm) and a gas barrier coating film / evaporated film / PET. A moisture-absorbing easy-peelable package of the present invention was produced in the same manner as in Example 1 except that an easy-peelable laminated film having a layer structure of film / adhesive / easy-peelable heat-sealing resin film was used. .

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

<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 was formed. Example 1 was repeated except that an easily peelable laminated film having a layer configuration of film / adhesive / aluminum foil / adhesive / moisture-absorbing 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 the easily peelable laminated film, the moisture-absorbing heat-sealable resin film produced in Example 1 was laminated between the PET film and the easily peelable heat-sealable resin film via an adhesive for dry lamination. Same as Example 4 except that an easily peelable laminated film having a layer structure of a hydrophilic coating film / a vapor-deposited film / PET film / adhesive / hygroscopic heat sealable resin film / easy peelable heat sealable resin film was produced. Thus, the moisture-absorbing easily peelable package of the present invention was produced.

<Example 7>
Sasaki Chemical Co., Ltd., DryKeep ^(R) as a hygroscopic heat-sealable resin film
Except having used SPES30-111J, it carried out similarly to Example 1, and manufactured the hygroscopic easy peeling package of this invention.

<Example 8>
Dry Keep ^(R) (SPES30-132J, 60 μm film thickness) is used for the hygroscopic heat-sealing resin film of the hygroscopic laminated film, and the easily peelable heat-sealing resin of the easily peelable laminated film is used. A hygroscopic and 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 as the film.

<Example 9>
A hygroscopic resin composition (Dainichi Seika Kogyo Co., Ltd., Pericon) containing 50% by mass of calcium oxide in a polyethylene resin, and LLDPE (Prime Polymer Co., Ltd., ULTZEX 2
022F) is formed by co-extrusion using an inflation method (extrusion temperature: 180 ° C.), and an LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 50 mass%) 30 μm / LLDPE layer 10 μm hygroscopic heat-sealing resin film Was manufactured in the same manner as in Example 1 except that was manufactured.

<Example 10>
A hygroscopic resin composition (Dainichi Seika Kogyo Co., Ltd., Pericon) containing 15% by mass of calcium oxide in a polyethylene resin, LLDPE (Prime Polymer Co., Ltd., ULTZEX)
2022F) and a co-extrusion film by an inflation method (extrusion temperature: 180 ° C.), and an LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 15 mass%) 30 μm / LLDPE layer 10 μm hygroscopic heat-sealing resin film Was manufactured in the same manner as in Example 1 except that was manufactured.

<Example 11>
A hygroscopic resin composition containing 35% by weight of calcium oxide in a polyethylene resin (Dainichi Seika Kogyo Co., Ltd., Pericon), LLDPE (Prime Polymer Co., Ltd., ULTZEX)
2022F) and a co-extrusion film by an inflation method (extrusion temperature: 180 ° C.), and an LLDPE layer 10 μm / hygroscopic resin composition layer (calcium oxide 35 mass%) 30 μm / LLDPE layer 10 μm hygroscopic heat-sealing resin film Was manufactured in the same manner as in Example 1 except that was manufactured.

<Comparative Example 1>
The moisture-absorbing layer of the moisture-absorbing laminated film is a heat-sealing layer (thickness: 50 μm) made of LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F) not containing a moisture-absorbing agent. A laminated film and a package were manufactured in the same manner as in Example 1 except that the resin layer was a heat seal layer (thickness: 50 μm) consisting only of LLDPE (Prime Polymer Co., Ltd., ULTZEX 2022F).

<Hygroscopic effect>
A pouch bag (120 mm x 160 mm) was prepared from the laminated films prepared in Examples and Comparative Examples, a moisture meter was placed in the pouch, and the relative humidity after standing for 7 days was measured. Table 1 shows the evaluation results.

<Easy peeling test>
Each of the hygroscopic laminated film and the easily peelable laminated film produced in Examples and Comparative Examples was cut into 10 cm × 10 cm, and superposed so that the respective heat sealing surfaces were opposed to each other, and a heat seal tester (tester industry: TP-701) was used. Using A), a sample in which a 1 cm × 10 cm area was heat-sealed under the conditions of 160 ° C., 1 kgf / cm ² , and 1 second was produced (
The ends are not heat-sealed and are not adhered, but are forked.) This sample was cut into a strip having a width of 1.5 cm, and each end divided into two branches was attached to a tensile tester, and the tensile strength when tested under the conditions of a test speed of 300 mm / min and a load range of 50 N. (N / 15 mm) was measured. Table 1 shows the evaluation results.

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 described above, the packages of Examples 1 to 11 exhibited a good moisture absorbing effect and an easy peeling property.

A. B. hygroscopic laminated film 3. Easy peelable laminated film 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 peeling heat seal layer

Claims (3)

A moisture-absorbing laminated film having at least a gas barrier layer and a moisture-absorbing 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 peelable heat seal layer is opposed to and superimposed, a moisture-absorbing easily peelable package obtained by heat sealing the peripheral portion,
When the moisture-absorbing heat seal layer has a single-layer structure, it is composed of a layer made of a heat-sealable resin containing a moisture absorbent,
The easily peelable heat-sealing layer contains a heat-sealing resin compatible with the resin constituting the layer made of the heat-sealing resin containing the moisture absorbing agent and a heat-sealing resin incompatible with each other. It is made of a resin composition,
When the hygroscopic heat seal layer has a multilayer structure, a layer composed of a resin composition containing a hygroscopic agent and a heat seal resin, and a layer composed of a heat seal resin,
The easily peelable heat-sealing layer is a heat-sealing resin that is compatible with a resin layer constituting a layer made of a resin composition containing a moisture absorbing agent and a heat-sealing resin, or a layer that is made of a heat-sealing resin. And a resin composition containing an incompatible heat-sealing resin,
The above-mentioned hygroscopic and easily peelable package.   The hygroscopic easy-peelable package according to claim 1, wherein the hygroscopic agent is a chemical hygroscopic agent.   The hygroscopic easily peelable package according to claim 1 or 2, which is a package for a blood glucose level measurement sensor.

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