TW201615422A - Easily peelable packaging bag - Google Patents

Abstract

The present invention provides a packaging bag which does not adsorb active ingredients of the contents and is capable of preventing deterioration due to oxygen, moisture or the like, and which has easy peelability based on an adequate heat sealing strength. An easily peelable packaging bag (10) which comprises: a non-adsorptive film (1) that is provided with a first base layer (12) and a first thermal bonding layer (11); and an absorptive film (2) that is provided with a second base layer (23), an absorption layer (22) and a second thermal bonding layer (21). This easily peelable packaging bag (10) is heat-sealed by means of the first thermal bonding layer (11) and the second thermal bonding layer (21). The first thermal bonding layer (11) contains EVOH and a maleic acid anhydride-modified polyolefin resin. The second thermal bonding layer (21) contains a maleic acid anhydride-modified polyolefin resin. The first thermal bonding layer (11) and the second thermal bonding layer (21) are heat-sealed at a heat sealing strength of 1.0-7.0 N/15 mm as measured by a T type peel test at a tension rate of 300 mm/min in accordance with JIS Z0238.

Description

Easy peeling bag

The present invention relates to a packaging bag which is easily peelable by a heat-sealing of a non-adsorptive film which does not adsorb a volatile component of a content and an absorbent film.

A patch for transdermal absorption of a medicinal ingredient is known. The adhesive agent is provided on a single surface of a plastic film or a non-woven fabric such as a polyolefin resin, and has an adhesive layer containing a medicinal ingredient, and the adhesive layer is covered with a peelable film before use thereof. . Such a patch is known to be stored in a packaging bag formed of a non-adsorptive film which does not adsorb a medicinal ingredient in order to prevent volatilization of the medicinal ingredient.

Since the non-adsorptive film is generally difficult to heat-seal, it is necessary to use the adhesive to form the film in order to obtain the package, but with the adhesive, the adhesive has an adverse effect on the contents due to the adhesive. It is not appropriate.

Therefore, Patent Document 1 discloses a non-adsorptive film having a heat sealable non-adhesive sealant film. According to the non-adsorptive film described in Patent Document 1, it is possible to obtain a non-adsorptive film (non-adsorbing film) Sealant film) A package formed by heat sealing each other.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-28732

However, in the packaging bag described in Patent Document 1, when the content is deteriorated by oxygen, moisture, or the like, it is necessary to package the oxygen absorbent, the moisture absorbent, and the like enclosed in a ventilating pouch or the like with the contents. In this case, by enclosing the absorbents at the same time, there is a problem that the packaging bag is enlarged and the labor is required to be sealed.

Therefore, the inventors of the present invention have begun to investigate a method in which a non-adsorptive film described in Patent Document 1 and an absorbent film containing an absorbent in a thermoplastic resin adhesive are bonded together, thereby obtaining a package which does not require an additional simultaneous encapsulation of the absorbent. .

However, when the oxygen-absorbing film as described in JP-A-2012-158125 is bonded to the non-adsorptive film described in Patent Document 1, the thermal adhesive layer of the non-adsorptive film is composed of non-adsorbing medicinal components. The ethylene-vinyl alcohol copolymer of the resin and the polymer alloy of the maleic anhydride-modified polyolefin resin, and the thermal adhesive layer of the oxygen-absorbing film is composed of a general polyolefin resin, so that it is simply borrowed. This is not possible by heat sealing.

Further, when the package is also required to be easily peelable, it is difficult to obtain a suitable heat even if the resin of the heat-adhesive layer of the non-adsorptive film and the resin of the heat-adhesive film of the oxygen-absorbing film are appropriately selected. A bag with a heat-sealing strength for easy peeling.

Therefore, the object of the present invention is to obtain a packaging bag which does not require simultaneous encapsulation of the absorbent, does not adsorb the volatilized component of the contents, and which can prevent deterioration due to oxygen or moisture, and which is easily peeled off based on moderate heat sealing strength. Sex bag. Furthermore, it is an object of the present invention to obtain a package which is particularly easy to produce in such a package.

As a result of a positive review by the present inventors, it has been found that the packaging bag of the present invention having the following constitution unexpectedly solves the above problems. That is, the present invention is as follows.

<1> A easily peelable packaging bag comprising a non-adsorptive film including a first base material layer and a first thermal adhesive layer, and an absorption comprising a second base material layer, an absorbent layer, and a second thermal adhesive layer And a packaging bag formed by heat sealing the first thermal adhesive layer and the second thermal adhesive layer, wherein the first thermal adhesive layer contains EVOH and a maleic anhydride-modified polyolefin resin, and the second The thermal adhesive layer contains a maleic anhydride-modified polyolefin resin, and the first thermal adhesive layer and the second thermal adhesive layer are based on JIS The T-peel test conducted by Z0238 was heat-sealed at a tensile speed of 300 mm/min and heat-sealed at a heat seal strength of 1.0 to 7.0 N/15 mm.

<2> The packaging bag according to <1>, wherein the first thermal adhesive layer and the second thermal adhesive layer are in a temperature range of 80 ° C to 280 ° C and a temperature range of at least 10 ° C, The heat seal strength is heat sealed.

<3> The packaging according to <1> or <2>, wherein the second thermal adhesive layer contains 10% by weight to 90% by weight of a maleic anhydride-modified polyolefin resin and 90% by weight to 10% by weight. Polyolefin resin.

<4> The packaging bag according to <3>, wherein the maleic anhydride-modified polyolefin resin is maleic anhydride-modified LDPE, and the polyolefin-based resin is PP.

<5> The packaging according to <3>, wherein the second thermal adhesive layer contains 20% by weight to 90% by weight of maleic anhydride modified LDPE, and 80% by weight to 10% by weight of LLDPE.

<6> The packaging according to <3>, wherein the second thermal adhesive layer contains a total of 20% by weight to 60% by weight of maleic anhydride modified LDPE and maleic anhydride modified LLDPE, and contains 80% by weight or more. 40% by weight of LLDPE and PP.

<7> The packaging according to <1> or <2> wherein the second thermal adhesive layer contains 10% by weight to 100% by weight of maleic anhydride modified PP and 90% by weight to 0% by weight of the polyolefin system. Resin.

<8> The packaging according to <7>, wherein the second thermal adhesive layer contains 30 to 70% by weight of maleic anhydride modified PP, and 70 to 30% by weight LLDPE.

The package according to any one of <1> to <8> wherein the first thermal adhesive layer contains 70% by weight to 90% by weight of EVOH and 30% by weight to 10% by weight of maleic anhydride. A polyolefin resin.

The packaging bag according to any one of <1> to <9> wherein the absorbent layer of the absorbent film contains an inorganic absorbent and a thermoplastic resin binder.

According to the packaging bag of the present invention, it is not necessary to additionally enclose the absorbent at the same time, and the active ingredient of the contents is not adsorbed, and deterioration due to oxygen or moisture or the like can be prevented, and the content can be easily taken out because of easy peelability. Moreover, in accordance with certain embodiments of the present invention, a package that is easy to produce can be obtained.

1‧‧‧ non-adsorptive film

11‧‧‧1st thermal layer

12‧‧‧1st substrate layer

2‧‧‧Absorbing film (oxygen absorbing film)

21‧‧‧2nd thermal layer

23‧‧‧2nd substrate layer

10‧‧‧Package bags

100‧‧‧Contents (adhesives)

A‧‧‧Support

B‧‧‧Pharmaceutical layer

C‧‧‧ peeling film

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a packaging bag of the present invention.

"Packaging Bag"

The packaging bag of the present invention is formed by heat-sealing the first thermal adhesive layer of the non-adsorptive film which does not adsorb the volatilized component of the content, and the second thermal adhesive layer of the absorbent film which absorbs the component which deteriorates the content. Here, the heat seal strength is a T-type peel test according to JIS Z0238, and is measured in a range of 1.0 to 7.0 N/15 mm at a tensile speed of 300 mm/min. By If the heat seal strength is within this range, it may have easy peelability. The heat sealing strength is preferably in the range of 1.5 to 6.0 N/15 mm, more preferably in the range of 2.0 to 5.5 N/15 mm.

By selecting the combination of the first thermal adhesive layer of the non-adsorptive film and the resin of the second thermal adhesive layer of the absorbent film, the heat sealing strength in the range can be from 80 ° C to 280 ° C, preferably from 130 ° C to 220 ° C. Further preferably, it is preferably exhibited in a temperature range of from 140 ° C to 210 ° C at least over a temperature range of 10 ° C. If the range is 10 ° C or more, the package can improve the yield at the time of production. Therefore, the wider the temperature range, the more suitable, and it is particularly preferably 20 ° C or more.

<non-adsorptive film>

The non-adsorptive film used in the packaging bag of the present invention comprises a first base material layer, that is, a first thermal adhesive layer containing an ethylene-vinyl alcohol copolymer (EVOH) and a maleic anhydride-modified polyolefin resin.

In the present specification, the term "non-adsorptive" means less than 80% by weight, 70% by weight or more, or 80% by weight or more of ethylene-vinyl alcohol (EVOH), and in particular, substantially does not adsorb menthol, The volatile components of limonene, methyl salicylate, camphor, tocopherol, etc., the aroma components of foods such as mustard, yellow mustard, and wasabi, and maintain the properties of the aroma components inside the packaging container. In particular, in the present specification, the term "non-adsorptive property" means that the weight value (mg) of the menthol adsorbed by the film when exposed to menthol vapor for one week is below the measurement limit. In this case, the menthol adsorption amount is a thin film produced by a non-adsorptive film (100 mm × 100 mm) at 40 ° C. One week after exposure to the alcohol vapor, the menthol adsorbed by the film was extracted with methyl ethyl ketone, and the amount of adsorption was quantified by gas chromatography. In this case, if it is a trace amount (less than 0.05 mg), the amount which cannot be quantified is set to the measurement limit or less.

The first thermal adhesive layer preferably contains 70% by weight to 90% by weight of EVOH and 30% by weight to 10% by weight of maleic anhydride modified polyolefin resin, particularly preferably 82% by weight to 90% by weight of EVOH and 18 The maleic anhydride-modified polyolefin resin is from 5% by weight to 10% by weight. In the first thermal adhesive layer, when the blending amount of EVOH is 70% by weight or more, the non-adsorptivity of the film is good, and when the blending amount of EVOH is 90% by weight or less, the heat sealability of the film is good. Further, the first thermal adhesive layer may contain other thermoplastic resins than EVOH and a maleic anhydride-modified polyolefin resin.

EVOH is an ethylene-vinyl alcohol copolymer saponified product, and the content of the ethylene unit is not particularly limited, but is selected in the range of 10 mol% to 70 mol%, preferably 15 mol% to 60 mol%, and more It is preferably 20% by mole to 60% by mole, and most suitably from 25% by mole to 55% by mole. And the sulphur content of the EVOH unit is selected from the range of 90% by mole to 100% by mole, preferably 95% by mole to 100% by mole, more preferably 99% by mole to 100% by mole. %. When the degree of saponification is high, it is easy to crystallize and the gas barrier property is also high. Further, since the thermal stability at the time of melting is also stabilized, the degree of saponification is preferably high. Here, as the vinyl ester, vinyl acetate is exemplified as a representative example, but other examples thereof include vinyl esters such as vinyl propionate, vinyl valerate, vinyl valerate, vinyl phthalate, and vinyl benzoate. These vinyl esters can be used alone or in combination of two or more. Further, EVOH may be used in combination with at least one different EVOH having an ethylene content, a degree of saponification, and a degree of polymerization. EVOH may also contain other copolymerized components within the scope not inhibiting the object of the present invention. These EVOHs can also be used in combination.

The maleic anhydride-modified polyolefin resin is a method in which maleic anhydride is graft-polymerized to a polyolefin-based resin. As the polyolefin resin, polyethylene {LDPE, linear low density polyethylene (LLDPE), ultra low density polyethylene (ULDPE), medium density polyethylene, high density polyethylene can be preferably used. (HDPE)}, polypropylene. These maleic anhydride-modified polyolefin-based resins may be used in combination of plural kinds.

For example, the maleic anhydride-modified polyolefin resin may be used in an amount of 0.05 parts by weight or more, 0.1 parts by weight or more, 0.3 parts by weight or more, 0.5 parts by weight or more, or 1.0% by weight or more, and 50% by weight based on 100 parts by weight of the polyolefin-based resin. The component is graft polymerized with maleic anhydride in an amount of 30 parts by weight or less, 20 parts by weight or less, 10 parts by weight or less or 5.0 parts by weight or less. As such a maleic anhydride-modified polyolefin-based resin, those described in JP-A-9-278956 can be exemplified.

The non-adsorptive film used in the packaging bag of the present invention further includes a first base material layer in addition to the first thermal adhesive layer. It is preferable that the first base material layer can impart barrier properties to the non-adsorptive film to prevent dust and intrusion of moisture or oxygen from the outside.

As such a first base material layer, a polyolefin resin film, a polyvinyl chloride film, a polyvinylidene chloride film, a polychlorotrifluoroethylene film, a polytetrafluoroethylene film, a saturated or unsaturated polyester film (for example, a poly Ethylene terephthalate (PET), polybutylene terephthalate, a polyamide film, a polyacrylonitrile film, and a laminate of two or more of these. Further, based on the purpose of improving barrier properties, a layer of pure aluminum foil or aluminum alloy foil may be laminated.

Further, as the first base material layer, a film obtained by depositing a vapor deposition layer or a halogenated polymer layer of a metal, a semimetal or the oxides on the resin film may be used. Here, as the vapor deposition layer of the metal, the semimetal or the oxides, aluminum vapor deposition film, ruthenium dioxide vapor deposition film, alumina vapor deposition film, ruthenium dioxide can be exemplified. As the halogenated polymer layer, an aluminum oxide binary vapor deposition film or the like can be exemplified by a polyvinylidene chloride coating film, a polyvinylidene fluoride coating film, or the like.

The thickness of the first thermal adhesive layer may be 5 μm or more, 10 μm or more, 20 μm or more, 30 μm or more, or 40 μm or more, and may be 150 μm or less, 100 μm or less, or 80 μm or less. Further, the thickness of the first base material layer may be 20 μm or more, 30 μm or more, or 50 μm or more, and may be 200 μm or less, 150 μm or less, or 100 μm or less.

<Non-adsorbing film - manufacturing method>

The first thermal adhesive layer of the non-adsorptive film used in the packaging bag of the present invention is preferably formed of a mixed resin obtained by polymer-polymerizing EVOH with a maleic anhydride-modified polyolefin resin, and can be produced, for example, by the following method.

The EVOH and the maleic anhydride-modified polyolefin resin were melt-mixed at a specific energy of 2.2 MJ/Kg or more, and then formed into a film. Here, the specific energy range at the time of melt mixing is preferably 2.7 MJ/Kg or more and 12.1 MJ/Kg or less. These materials are melt-mixed at a specific energy of 2.2 MJ/Kg or more, and the mixed state of the obtained resin is appropriate. When the specific energy is less than 12.5MJ/Kg, A problem such as deterioration of the resin occurs.

The specific energy means the energy which is supplied to the resin per unit weight (1 kg) by the melt kneading device at the time of melt kneading, and is a value obtained by the following formula. The larger the value, the higher the kneading effect.

Here, the torque, the number of revolutions of the kneader, and the amount of resin extrusion are as follows.

Torque: the force required to rotate the screw of the mixer

The number of revolutions of the kneading machine: the number of revolutions of the kneading machine required to rotate the screw of the kneading machine per unit time

Resin Extrusion Amount: The amount of resin extruded from the kneader per unit time.

The melt mixing of EVOH with a maleic anhydride-modified polyolefin resin can be carried out by a twin-shaft or more screw kneader. In the screw kneading machine with more than two shafts, the screw shape has an influence on the energy of the resin extrusion. In the screw shape, it is desirable to use a combination of the kneading portion, the reverse spiral portion, and/or the mixing portion of the spiral portion in comparison with the use of only the spiral portion (hereinafter referred to as the full spiral type) (hereinafter, Called high shear type).

The screw may be used alone or in combination in the form of a screw and a screw formed of a grenade type or a kneading disc.

In addition to EVOH and acid-modified polyolefin resin, it can also contain heat-resistant stabilizers, weather stabilizers, slip agents, antistatic agents, nucleating agents, fillers, pigments, dyes, flame retardants, anti-adhesives. Agent Additives such as.

The polymer alloy obtained by melt mixing is formed into a film by a molding method such as a T-die method or a blow molding method to obtain a first thermal adhesive layer.

In general, a film obtained by melt-mixing and mixing a non-compatible resin component with each other is known to have an island structure in which one resin is sea-like and the other resin component is island-shaped dispersed.

The first thermal adhesive layer of the non-adsorptive film used in the present invention formed of a mixed resin obtained by alloying EVOH and a maleic anhydride-modified polyolefin-based resin polymer has a sea shape in the form of EVOH. The anhydride-modified polyolefin resin tends to be an island-like dispersed island structure. In this case, the length and width of the acid-modified polyolefin resin dispersed in an island shape are preferably in the range of 2.0 or more and 9.5 or less, more preferably in the range of 2.2 or more and 9.3 or less.

The measurement of the aspect ratio is performed by analyzing an image of an atomic force microscope, and the average value of the ratio of the major axis to the minor axis of the particles of the maleic anhydride-modified polyolefin resin which is distributed on the island is obtained as the aspect ratio. The image analysis system was measured using the image analysis type particle size distribution measurement software Mac-View version 4.0 manufactured by MOUNTECH. This automatically measures the aspect ratio, area, and so on. An average of 100 or more particles in the image was calculated.

When the aspect ratio of the island-shaped maleic anhydride-modified polyolefin resin is in the above range, it is preferable to form an appropriate heat-sealing strength when heat-sealed together with the second thermal adhesive layer of the oxygen-absorbing film.

The lamination method of the first thermal adhesive layer and the first base material layer is exemplified by dry lamination, extrusion lamination, and the like. Dry lamination is applied to a film to apply an adhesive After drying, the other film is superposed and pressurized, and the adhesive is cured and adhered. Further, the extrusion lamination is carried out by laminating between two films, and extruding a molten polyethylene resin or the like and bonding them.

<Absorbing film>

The absorbent film used in the packaging bag of the present invention comprises a second base material layer, an absorbent layer, and a second thermal adhesive layer. As described above, since the second thermal adhesive layer is heat-sealed to the first thermal adhesive layer of the non-adsorptive film, it is located in the innermost layer of the packaging bag, and the absorbent layer is located between the second thermal adhesive layer and the second substrate layer.

The second thermal adhesive layer of the absorbent film used in the packaging bag of the present invention contains a maleic anhydride-modified polyolefin resin. The first thermal adhesive layer of the non-adsorptive film contains a certain amount of maleic anhydride-modified polyolefin resin, and the second thermal adhesive layer also contains a certain amount of maleic anhydride-modified polyolefin resin, thereby being capable of packaging The bag imparts a suitable heat seal strength.

As the maleic anhydride-modified polyolefin resin, the same resin as that described for the non-adsorptive film can be used.

The second thermal adhesive layer may be a maleic anhydride-modified polyolefin resin as long as it exhibits a suitable heat-sealing strength with the first thermal adhesive layer, but may contain other thermoplastic resin.

The thermoplastic resin which can be contained in the second thermal adhesive layer other than the maleic anhydride-modified polyolefin resin, for example, a polyolefin resin other than the maleic anhydride-modified polyolefin resin, a polystyrene resin, and a poly An ester resin, an acrylic resin, a polyurethane resin, a polycarbonate resin, a polyfluorene resin, and derivatives thereof, and a mixture thereof Things. Particularly preferred among these are polyolefin resins.

The polyolefin-based resin may, for example, be a polyethylene resin (PE) or a polypropylene resin (PP) other than the maleic anhydride-modified polyolefin resin. Examples of such polyethylene-based resins are low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and ethylene-acrylic acid copolymer ( EAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene Vinyl acetate copolymer (EVA), ionic polymers, and derivatives thereof, and mixtures thereof. Further, as such a polypropylene-based resin, a polypropylene homopolymer, a random polypropylene (random PP), a block polypropylene (block PP), a chlorinated polypropylene, and the like, and the like are exemplified. a mixture of such.

When the polyolefin resin is contained, the second thermal adhesive layer preferably contains 10% by weight to 90% by weight (preferably 20% by weight to 80% by weight) of the maleic anhydride-modified polyolefin resin, and 90% by weight. ~10% by weight (preferably 80% by weight to 20% by weight) of the polyolefin-based resin.

When the second thermal adhesive layer is entirely composed of a maleic anhydride-modified polyolefin resin, maleic anhydride-modified PP is preferably used. The second thermal adhesive layer contains 10% by weight or more, 30% by weight or more, or 50% by weight or more of the maleic anhydride-modified PP, and 90% by weight or less, 70% by weight or less, or 50% by weight or less of the polyolefin-based resin. .

The inventors found that it contains 20% by weight to 90% by weight (more 255% by weight to 80% by weight, more preferably 30% by weight to 70% by weight) of maleic anhydride modified LDPE and 80% by weight to 10% by weight (preferably 75% by weight to 20% by weight, and preferably 70) The second thermal adhesive layer of LLDPE in a weight % to 30% by weight can impart heat-sealing strength capable of imparting easy peelability at a wide range of heat sealing temperatures.

The present inventors have found that the maleic anhydride-modified LDPE and the maleic anhydride-modified LLDPE are contained in an amount of 20% by weight to 60% by weight (preferably 30% by weight to 50% by weight), and the total amount of LLDPE and PP is 80% by weight to 40%. The second thermal adhesive layer of % by weight (preferably 70% by weight to 50% by weight) imparts heat-sealing strength capable of imparting easy peelability at a very wide range of heat sealing temperatures.

Further, the present inventors have found that 30 to 70% by weight (preferably 40% by weight to 60% by weight) of maleic anhydride modified PP, and 70 to 30% by weight (preferably 60% by weight to 40% by weight) of LLDPE are contained. The second thermal adhesive layer can also impart a heat seal strength capable of imparting easy peelability at a very wide range of heat sealing temperatures.

When the second thermal adhesive layer contains maleic anhydride-modified PE, the surface absorbance of FT-IR is 1710 to 1712 cm ^-1 of the absorption band due to the stretching vibration of C=O, which is relative to the CH derived from polyolefin. The absorbance of the absorption band of the variable angular vibration is preferably from ¹ , 10 to 1,464, ^-1 , 0.015 or more, from 0.020 or more, from 0.025 or more, or from 0.030 or more, and from 0.100 or less, from 0.080 or less, from 0.060 or less, or from 0.050 or less. Further, when the second thermal adhesive layer contains maleic anhydride modified PP, when the surface thereof is measured by FT-IR, the absorbance of the absorption band due to the stretching vibration of C=O is 1710 to 1712 cm ^-1 with respect to the polyolefin. The absorbance of the absorption band of the CH variable angular vibration is preferably from 1,415 to 1,464 cm ^-1 to 0.015 or more, 0.020 or more, 0.025 or more, 0.028 or more, or 0.030 or more, and 0.080 or less, 0.060 or less, 0.050 or less, or 0.040 or less. In this case, the measurement was carried out by the method described in the examples. From the ratios, the content of the maleic anhydride-modified polyolefin resin in the second adsorption layer and the degree of modification of the maleic anhydride-modified polyolefin resin by maleic anhydride can be estimated.

The absorbent contained in the absorbent layer can be exemplified by, for example, an oxygen absorbent, a moisture absorbent, or the like, or a combination of the absorbents. The absorbent used herein is preferably a substance which does not substantially absorb an active ingredient (e.g., a medicinal ingredient) of the contents, and which absorbs a component which deteriorates the contents.

In particular, an inorganic absorbent can be used as the absorbent, and as the inorganic absorbent, chemical adsorbents such as calcium oxide, calcium chloride, calcium sulfate, magnesium sulfate, and sodium sulfate, and alumina, quicklime, tannin, and inorganic compounds can be exemplified. A physical adsorbent such as a molecular sieve. Examples of the molecular sieve as the inorganic compound are not limited, and examples thereof include aluminosilicate minerals, clay, porous glass, microporous activated carbon, zeolite, activated carbon, or an open structure having a small molecule capable of diffusing water or the like. Compound. Such an inorganic absorbent is useful as a moisture absorbent because it can obtain high hygroscopicity even in a low humidity region.

As the zeolite, natural zeolite, artificial zeolite, synthetic zeolite or the like can be used. Zeolite is a porous plasmid-like substance used for separating substances according to differences in molecular size, and has a uniform pore structure, due to absorption It acts as a sieve for small molecules in the pores of the pores, so it can absorb water (steam, water vapor), organic gases, and the like. One example of the synthetic zeolite is a molecular sieve, and in particular, a molecular sieve having a pore (absorption opening) diameter of 0.3 nm to 1 nm can be used. Generally, molecular sieves having a pore diameter of 0.3 nm, 0.4 nm, 0.5 nm, and 1 nm are referred to as molecular sieve 3A, molecular sieve 4A, molecular sieve 5A, and molecular sieve 13X, respectively. The average particle diameter of the molecular sieve (the particle diameter of 50% of the cumulative value in the particle size distribution obtained by the laser diffraction and scattering method) is, for example, about 10 μm. In the present invention, the zeolite may be suitably used in combination with the purpose of absorbing the object or the nature of the contents and the like.

As the absorbent, a conventional oxygen absorber such as iron powder or cerium oxide can also be used. For example, those described in JP-A-H09-70531, JP-A-2001-9273, JP-A-2012-158125, and the like can be used. Among them, cerium oxide having oxygen deficiency is particularly preferred. The cerium oxide-based cerium oxide having an oxygen deficiency is heated in a reducing gas such as hydrogen, carbon monoxide or acetylene, and has a fluorite-like structure and is represented by the general formula CeO _2-x . The x indicating the degree of oxygen deficiency is a range of more than 0 and 1 or less. When it exceeds 1, the crystal structure cannot be preserved, which is not preferable.

The absorbent may be contained in an amount of 5% by weight or more, 10% by weight or more, 20% by weight or more, 30% by weight or more, 40% by weight or more, or 50% by weight or more based on the weight of the absorbent layer, based on the absorbent capacity. The layer may be contained in the absorbent layer in a range of 90% by weight or less, 80% by weight or less, 70% by weight or less, or 60% by weight or less based on the viewpoint of dispersibility and moldability in the thermoplastic resin binder.

As the thermoplastic resin for the absorbent layer, examples of the thermoplastic resin include a polyolefin resin, a polystyrene resin, a polyester resin, an acrylic resin, a polyamide resin, and a polyurethane. A resin, a polycarbonate resin, a polyfluorene resin, and derivatives thereof, and mixtures thereof. Among them, a polyolefin-based resin is particularly suitable, and a resin similar to the polyolefin-based resin which can be used for the second thermal adhesive layer can be used.

As the second base material layer, the same layer as the first base material layer of the non-adsorptive film described above can be used.

The skin layer may be further contained between the absorbent layer and the second base material layer, whereby the interlayer peeling between the absorbent layer and the second base material layer can be prevented. In this case, the skin layer may be composed of the same resin as the second thermal adhesive layer, or may be composed of a thermoplastic resin adhesive which can be used for the absorbent layer.

The thickness of the second thermal adhesive layer and the skin layer is preferably 5 μm or more, 10 μm or more, or 20 μm or more, and is preferably 80 μm or less, 50 μm or less, or 30 μm or less. The thickness of the oxygen absorbing layer is preferably 10 μm or more, 20 μm or more, or 30 μm or more, and is preferably 100 μm or less, 80 μm or less, or 50 μm or less. The thickness of the second base material layer is preferably 20 μm or more, 30 μm or more, or 50 μm or more, and is preferably 200 μm or less, 150 μm or less, or 100 μm or less.

<Absorbing film - manufacturing method>

As the absorbent film, the second thermal adhesive layer and the absorbent layer can be produced by a multilayer blow molding method, a multilayer T die method, a multilayer casting method, or the like.

Before the second thermal adhesive layer and the absorbent layer are manufactured by a multilayer blow molding method, a multilayer T die method, a multilayer casting method, or the like, the heat of the absorption layer can be heated. The plastic resin binder and the absorbent are heated and kneaded by a batch or continuous kneading machine such as a kneading machine, a Banbury mixer, a Henschel mixer, a mixing roll, a single-axis extruder or a twin-axis kneading machine, and then processed. In the form of a granulated sheet, a resin composition (granule) for an absorbing layer can be produced. Further, the pellets of the above-mentioned pellets and the thermoplastic resin binder may be dry blended, and the content of the absorbent may be adjusted by dilution. When the second thermal adhesive layer contains a maleic anhydride-modified polyolefin resin and another thermoplastic resin, the maleic anhydride-modified polyolefin resin and other thermoplastic resins are batch-type or continuous kneading machines similarly to the absorbent layer. After heating and kneading, such as a uniaxial extruder or a biaxial kneader, it is processed into a pellet shape, and the resin composition (granule) for the second thermal adhesive layer can be produced.

Then, by using a pellet of the absorbent layer and a pellet of the resin for the second thermal adhesive layer, a multilayer film is formed by a blow molding method or the like to produce an absorbent film. When the skin layer is applied to the absorbent film, the skin layer is produced by multi-layer film formation together with the absorbent layer and the second heat-bonding layer by a multilayer blow molding method or the like. Alternatively, the absorbent layer may be produced by a blow molding method or the like, and the separately produced second thermal adhesive layer and optional skin layer may be laminated by conventional lamination such as hot pressing or dry lamination.

The method of laminating the second base material layer and the absorbent layer or the skin layer of the absorbent film can be carried out in the same manner as the method of laminating the first heat adhesive layer and the first base material layer of the non-adsorptive film. Further, in the production of the absorbent film, similarly to the case of producing a non-adsorptive film, a heat-resistant stabilizer, a weather-resistant stabilizer, a lubricant, an antistatic agent, a nucleating agent, a filler, a pigment, a dye, or the like may be contained. Additives such as flame retardants, light stabilizers, antioxidants, UV absorbers, plasticizers, anti-blocking agents, and the like.

<content>

The content of the packaging bag enclosed in the present invention is not particularly limited as long as it is affected by the presence of oxygen, moisture, or the like. For example, foods, medicines, chemicals, and the like can be exemplified. As the medicine, for example, a patch which percutaneously absorbs a medicinal component which is deteriorated by oxygen can be exemplified. Further, a chemical agent which is deteriorated by moisture or the like can also be exemplified.

Figure 1 shows a package (10) of the invention comprising a content (100). The packaging bag (10) is formed by heat-sealing a non-adsorptive film (1) and an absorbent film (2), and the non-adsorptive film (1) comprises a first thermal adhesive layer (11) and a first substrate layer. (12) The absorbent film (2) includes a second thermal adhesive layer (21), an absorbent layer (22), and a second substrate layer (23).

For example, the absorbing film (2) is an oxygen absorbing film, and the medicinal component layer (B) obtained by applying the content to the support (A) is coated with a release film (C) made of plastic. Adhesive (100). In such a medicinal ingredient patch, the medicinal ingredient is easily volatilized from the side of the support (A) of the patch (100). Therefore, when the support (A) of the patch (100) is placed on the side of the non-adsorptive film (1), the release film (C) is placed on the side of the oxygen-absorbing film (2), and the patch (100) is attached. When enclosed in the packaging bag (10) of the present invention, the volatilization of the medicinal ingredient can be prevented, and the amount of oxygen in the package can be kept at a low concentration by the oxygen absorbing film (2).

"Manufacturing method of packaging bags"

The packaging bag of the present invention can be produced by heat-sealing the first thermal adhesive layer of the non-adsorptive film and the second thermal adhesive layer of the absorbent film.

The heat-sealing condition is not limited as long as the heat-sealing strength can be imparted. For example, the heat-releasing layers can be applied in a range of from 80 ° C to 280 ° C at a pressure of from 0.05 MPa to 5.0 MPa, and from 0.05 seconds to 5.0 seconds. The heat sealing temperature can be, for example, 80° C. or higher, 100° C. or higher, 110° C. or higher, 120° C. or higher, or 130° C. or higher, and 280° C. or lower, 250° C. or lower, 230° C. or lower, or 210° C. or lower. The heat sealing pressure can be set to 0.05 MPa or more, 0.1 MPa or more, or 0.2 MPa or more, and 5.0 MPa or less, 3.0 MPa or less, 1.0 MPa or less, 0.8 MPa or less, or 0.5 MPa or less. The heat sealing time can be, for example, 0.05 second or longer, 0.1 second or longer, 0.2 second or longer, or 0.3 second or longer, and 5.0 seconds or shorter, 3.0 seconds or shorter, 2.0 seconds or shorter, 1.0 second or shorter, or 0.8 second or shorter.

In the packaging bag of the present invention, at least a part of the first thermal adhesive layer of the non-adsorptive film and the second thermal adhesive layer of the absorbent film are heat-sealed, and a square bag, a enamel bag or the like can be formed. The heat sealing is also a conventional method of performing a pulse method or the like in accordance with the above conditions.

[Examples] Sample Making <Production of non-adsorptive film>

12 parts of maleic anhydride modified polyolefin resin (MODIC) DU6400 (Mitsubishi Chemical Co., Ltd.) and 88 parts of EVOH (EVAL E171B, KURARAY Co., Ltd.) melt-mixed a polymer alloy obtained by a specific energy of 5.6 MJ/kg with a T-die to form a film having a thickness of 30 μm. 1 Thermal adhesive layer (length ratio of the island of maleic anhydride-modified polyolefin resin: 2.59, menthol adsorption amount: below the measurement limit). Melt mixing and film forming with a T-die use a double-axis kneading extruder with a screw with a screw screw and a grenade type and a kneading disc and L/D=30 (LAB OPLASTOMILL, Toyo Seiki Co., Ltd. Limited Company) proceed. The PET film (thickness: 12 μm) and the aluminum foil (thickness: 9 μm) in which the first thermal adhesive layer was a dry layer of the first base layer was formed into a non-adsorptive film made of a PET film/aluminum foil/first thermal adhesive layer. In the film formation of the first thermal adhesive layer, an anti-adhesion-containing resin pellet (PEX ABR-24AL, Tokyo Ink Co., Ltd.) may be added in an amount that does not affect the heat-sealing property.

Using the non-adsorptive film, the packaging bags of Examples 1 to 16 and Comparative Example 1 were produced and evaluated.

<Production of Absorbent Film>

An oxygen absorbing film was produced as an absorbent film. The resin pellets for the second thermal adhesive layer of the oxygen-absorbing film were prepared in the compositions of Examples 1 to 16 and Comparative Example 1 described in Table 1. An anti-adhesive-containing resin pellet (PEX ABR-24AL, Tokyo Ink Co., Ltd.) in an amount that does not affect the heat-sealing property is also added here.

Preparation of cerium oxide having oxygen deficiency as addition to the absorption layer Oxygen absorber in the middle. 75 parts by weight of this oxygen absorber and 25 parts by weight of LDPE (MFR=8.0 g/10 min) were gasified, kneaded, and formed in a nitrogen atmosphere using a biaxial kneading extruder (LAB OPLASTOMILL, Toyo Seiki Seisakusho Co., Ltd.). Granules for the oxygen absorbing layer.

Further, a pellet of LLDPE (EVOLUE SP2520, PRIME POLYMER Co., Ltd.) was prepared as a skin layer.

The resin pellet for the second thermal adhesive layer, the resin pellet for the oxygen absorbing layer, and the resin pellet for the skin layer are used, and the multilayer T-die film forming machine (KZW15TW-45MG-NH (-2200, TECHNOVEL shares limited) (Company), an oxygen-absorbing multilayer film having a three-layer structure (20 μm of skin layer/30 μm of oxygen absorbing layer/20 μm of second heat-bonding layer) was produced.

A laminated substrate obtained by extrusion-bonding a PET film having a thickness of 12 μm and an aluminum foil having a thickness of 9 μm by polyethylene was prepared as a second substrate layer. The aluminum foil surface of the second base material layer is extrusion-laminated with the skin layer of the three-layer structure oxygen-absorbing multilayer film produced by the above method to obtain an oxygen-absorbing film.

<Forming of packaging bags>

The first thermal adhesive layer of the non-adsorptive film is aligned with the second thermal adhesive layer of the oxygen-absorbing film, and the four sides of the film are separated by a pressure of 0.2 MPa and a heating time of 0.5 second at intervals of 10 ° C. Heat sealed at various temperatures to make a 4-sided sealed bag.

"Evaluation" <Evaluation of heat seal strength>

The heat seal strength was measured in accordance with the T-peel test conducted in accordance with JIS Z0238 at a tensile speed of 300 mm/min. When the heat-sealing strength in the range of 1.0 to 7.0 N/15 mm was obtained by the measurement, it was evaluated as ○ as a heat-sealing strength imparting easy peelability, and when the heat-sealing strength in the range was not obtained, it was evaluated as ×.

Further, for the packaging bags of the respective examples which are heat-sealed at various temperatures of 10 ° C, in a wide range of heat sealing temperatures of 20 ° C or more, the heat-sealing strength imparting easy peelability can be followed by the packaging bag. The manufacturing suitability was ◎, the manufacturing suitability at a temperature range of 10 ° C or higher was ○, and when it was less than 10 ° C, it was Δ.

<Measurement of absorbance derived from maleic anhydride of the second thermal adhesive layer of the oxygen absorbing film>

FT-IR was performed on the surface of the second thermal adhesive layer of the oxygen-absorbing film by a one-time reflection ATR method (crystal = diamond/ZnSe) using a Fourier transform infrared spectroscopic analyzer (SPECTRAM 100, PERKIN ELMER Co., Ltd., Japan) The absorbance of 1710 to 1712 cm ^-1 of the absorption band of the stretching vibration of C = O due to maleic anhydride and the absorbance of the absorption band of 1462 to 1464 cm ^-1 caused by the vibration of the CH angle of the polyolefin were confirmed. Next, the ratios (the absorbance of the absorption band of the stretching vibration of C=O/the absorbance of the absorption band of the CH-angle vibration) are obtained. The assay was performed multiple times and the average was used.

"result"

The results are shown in Table 1 below.

From this result, it is understood that when the second thermal adhesive layer of the absorbent film is composed only of LLDPE, it cannot be thermally sealed with the first thermal adhesive layer of the non-adsorptive film. On the other hand, when the second thermal adhesive layer of the absorbent film contains a maleic anhydride-modified polyolefin-based resin, even if the amount is small, the heat-sealing temperature is high by heat sealing.

It has been found that when the second thermal adhesive layer contains a certain amount of maleic anhydride-modified LDPE and LLDPE, it can impart heat-sealing strength capable of imparting easy peelability at a wide range of heat-sealing temperatures. Similarly, when the maleic anhydride-modified LDPE and the maleic anhydride were used to modify the LLDPE in the second thermal adhesive layer, and the LLDPE and the PP were used in combination to each other, the heat sealing temperature was imparted to a wide range of heat sealing temperatures. Provides heat seal strength for easy peelability. Further, it is understood that when the second thermal adhesive layer contains maleic anhydride-modified PP, it is also possible to impart a heat-sealing strength capable of imparting easy peelability at a wide range of heat-sealing temperatures.

When observing the ratio of the absorbance (the absorbance of the absorption band of the stretching vibration of C=O/the absorbance of the absorption band of the vibration of the CH variable angle), it is understood that the amount of the maleic anhydride-modified polyolefin resin is larger, and the ratio is larger. The more you improve.

In addition to the above examples, the present inventors have used, in addition to the use of 9 parts by weight of maleic anhydride modified LDPE (MODIC DL2500, Mitsubishi Chemical Corporation) and 1 part by weight of LLDPE (EVOLUE SP2520, PRIME POLYMER Co., Ltd.) In the same manner as in Example 3 except for the thermal adhesive layer, good peelability and a wide range of heat sealing temperatures were confirmed.

Furthermore, the inventors of the present invention have changed the LLDPE of 1 part by weight to 1 part by weight of PP (MODIC PP (PG3DC), Japan POLYPROPYLENE Co., Ltd.) in the second thermal adhesive layer of the packaging bag, and Confirm good peelability and a wide range of heat sealing temperatures.

Further, the thickness of the oxygen-absorbing multilayer film was set to 10 μm in the skin layer, 20 μm in the oxygen-absorbing layer, and 10 μm in the second heat-bonding layer. After the packaging bag was produced in the same manner as in Example 2, it was confirmed that good peelability and a wide range of heat were observed. Sealing temperature. The layer thickness of the oxygen-absorbing multilayer film is also the same as the skin layer 20 μm/oxygen absorption layer 20 μm/second thermal layer 20 μm.

1‧‧‧ non-adsorptive film

2‧‧‧Absorbing film (oxygen absorbing film)

10‧‧‧Package bags

11‧‧‧1st thermal layer

12‧‧‧1st substrate layer

21‧‧‧2nd thermal layer

22‧‧‧absorbing layer

23‧‧‧2nd substrate layer

100‧‧‧Contents (adhesives)

A‧‧‧Support

B‧‧‧Pharmaceutical layer

C‧‧‧ peeling film

Claims (10)

An easily peelable packaging bag comprising a non-adsorptive film including a first base material layer and a first thermal adhesive layer, and an absorbent film including a second base material layer, an absorbent layer, and a second thermal adhesive layer. And a packaging bag formed by heat sealing the first thermal adhesive layer and the second thermal adhesive layer, wherein the first thermal adhesive layer contains EVOH and a maleic anhydride-modified polyolefin resin, and the second thermal adhesive layer The maleic anhydride-modified polyolefin resin is used, and the first thermal adhesive layer and the second thermal adhesive layer are subjected to a T-peel test according to JIS Z0238, and when measured at a tensile speed of 300 mm/min, 1.0 to 7.0. The N/15mm heat seal strength is heat sealed. The packaging bag of claim 1, wherein the first thermal adhesive layer and the second thermal adhesive layer are heated in the temperature range of 80 ° C to 280 ° C and at least 10 ° C, and can be heated by the heat sealing strength. seal. The packaging bag according to claim 1 or 2, wherein the second thermal adhesive layer contains 10% by weight to 90% by weight of a maleic anhydride-modified polyolefin resin and 90% by weight to 10% by weight of a polyolefin-based resin. The packaging bag according to claim 3, wherein the maleic anhydride-modified polyolefin resin is maleic anhydride-modified LDPE, and the polyolefin-based resin is PP. The package of claim 3, wherein the second thermal adhesive layer comprises 20% by weight to 90% by weight of maleic anhydride modified LDPE, and 80% by weight to 10% by weight of LLDPE. The packaging bag of claim 3, wherein the second thermal adhesive layer comprises a total of 20% by weight to 60% by weight of maleic anhydride modified LDPE and maleic anhydride modified LLDPE, and contains 80% by weight to 40% by weight in total. LLDPE and PP. The packaging bag according to claim 1 or 2, wherein the second thermal adhesive layer contains 10% by weight to 100% by weight of a maleic anhydride-modified PP and 90% by weight to 0% by weight of a polyolefin-based resin. The package according to claim 7, wherein the second thermal adhesive layer contains 30 to 70% by weight of maleic anhydride modified PP and 70 to 30% by weight of LLDPE. The packaging bag according to any one of claims 1 to 8, wherein the first thermal adhesive layer contains 70% by weight to 90% by weight of EVOH and 30% by weight to 10% by weight of a maleic anhydride-modified polyolefin resin. The packaging bag according to any one of claims 1 to 9, wherein the absorbent layer of the absorbent film comprises an inorganic absorbent and a thermoplastic resin binder.