JP5699325B2 - Low adsorptive standing pouch - Google Patents

Description

  The present invention relates to a low adsorptive standing pouch in which the amount of active ingredients contained in the contents of chemical products, pharmaceuticals, foods and the like is reduced, and more specifically, the content of the active ingredients in the contents. The present invention relates to a standing pouch made of a laminate having a sealant film that can be kept high and exhibits high sealing strength and can be easily formed.

  Conventionally, the innermost layer of a packaging material such as a packaging bag or a lid material is provided with a sealant layer made of a polyolefin resin such as polyethylene or polypropylene showing high sealing strength, or a copolymer resin such as ionomer or EMMA. These resins can achieve high adhesion strength by heat sealing, but are known to easily adsorb various organic compounds. Therefore, a packaging material having a sealant layer made of these resins as the innermost layer, that is, a layer in contact with the contents, is not suitable for packaging chemical products, pharmaceuticals, foods, etc. containing an organic compound as an active ingredient. It is necessary to take measures such as adding more active ingredients.

  Accordingly, development of a sealant layer that has a good seal strength and hardly adsorbs active ingredients has been made. Typically, a packaging material having a low adsorptive sealant layer made of acrylonitrile-based resin as an innermost layer is used (Patent Document 1).

  However, since an acrylonitrile-based resin does not provide good seal strength and is expensive, development of a more preferable low adsorptive sealant is required.

  On the other hand, for example, Patent Document 2 discloses a low adsorptive packaging material in which the innermost layer is formed of an aluminum foil or an inorganic deposited film. The packaging material is used by making a bag by partially forming an adhesive resin layer on the aluminum foil or vapor deposition film. As the adhesive resin layer, urethane resin, vinyl chloride-vinyl acetate copolymer, acrylic resin, and the like are disclosed. However, such a packaging material has a complicated manufacturing process.

JP-A-7-132946 Japanese Patent Laid-Open No. 10-45176

  An object of the present invention is to solve the above problems, to provide a sealant film that exhibits excellent low adsorptivity and seal strength, and that can be easily formed, and a laminate and a standing pouch using the sealant film. And

As a result of various studies, the inventors have made a standing pouch comprising a laminate having a sealant layer and having a trunk portion and a bottom portion, and the sealant layer of the trunk laminate forming the trunk portion is at least a first pouch. One polyolefin resin layer, a cyclic polyolefin resin composition layer laminated adjacently on the first polyolefin resin layer, and a second laminate laminated adjacently on the cyclic polyolefin resin composition layer. And a second polyolefin resin layer is the outermost layer in the laminate for body material, wherein the cyclic polyolefin resin composition is a layer composed of a sealant film having two polyolefin resin layers. A cyclic polyolefin resin and an olefin resin, and the olefin resin has a melt flow rate at 190 ° C. of 5 to 40 g / 10 minutes. In addition, a standing pouch characterized in that the sealant layer of the laminate for a bottom material that is present in the resin composition at a ratio of 3 to 50% by mass and forms the bottom is a layer made of a polyolefin resin, It has been found that the above object is achieved.

The present invention is characterized by the following points.
1. A standing pouch comprising a laminate having a sealant layer and having a trunk and a bottom, wherein the sealant layer of the laminate for a trunk forming the trunk includes at least a first polyolefin resin layer and the first A sealant film having a cyclic polyolefin resin composition layer laminated adjacently on the polyolefin resin layer and a second polyolefin resin layer laminated adjacently on the cyclic polyolefin resin composition layer The second polyolefin resin layer is an outermost layer in the laminate for body material, and the cyclic polyolefin resin composition comprises a cyclic polyolefin resin and an olefin resin. And the olefin resin has a melt flow rate at 190 ° C. of 5 to 40 g / 10 min, and 3 to 5 in the resin composition. Present in a proportion of mass%, further, the sealant layer of the base material for the laminate for forming the bottom, characterized in that a layer comprising a polyolefin resin, a standing pouch.
2. The sealant film forming the sealant layer of the laminate for body material is formed by co-extrusion of the first polyolefin resin layer, the cyclic polyolefin resin composition layer, and the second polyolefin resin layer. 2. The standing pouch according to 1 above, wherein
3. 3. The standing pouch according to 1 or 2 above, wherein the polyolefin resin constituting the first and second polyolefin resin layers is a linear low density polyethylene resin.
4). The thickness of the first polyolefin resin layer is 10 to 100 μm, the thickness of the cyclic polyolefin resin composition layer is 2 to 30 μm, and the thickness of the second polyolefin resin layer is 10 to 100 μm. The standing pouch according to any one of claims 1 to 3, wherein the thickness of the sealant layer of the laminate for low material is 50 to 200 µm.
5. A package formed by filling the contents of the standing pouch described in any one of 1 to 4 above.

  A generally known single-layer sealant film made of only a polyolefin resin has a thickness proportional to an organic compound adsorption amount and a sealing strength. Therefore, when the sealant film of the packaging bag is thinned to prevent the contents from being adsorbed, the sealing strength is lowered and the impact resistance of the bag is lowered. Further, when the sealant film is thickened to improve the impact resistance, the amount of content adsorbed increases.

  On the other hand, the sealant film used in the standing pouch of the present invention has a polyolefin resin layer (that is, a second polyolefin resin layer) as an innermost layer, a cyclic polyolefin resin composition layer and a first polyolefin resin layer. By being lined with a resin layer, the amount of adsorption is small and high sealing strength is exhibited. Moreover, this tendency becomes more remarkable by coextrusion of these three layers, particularly by coextrusion by the inflation method.

  That is, the sealant film used in the standing pouch of the present invention is difficult to adsorb various organic compounds such as l-menthol and methyl salicylate. In addition, it exhibits a sufficiently high sealing strength to form an innermost layer such as a self-supporting bag (standing pouch). Furthermore, since the cyclic polyolefin resin exhibits a high intermolecular force and has a close surface structure with a close intermolecular distance, the sealant film containing the resin suppresses the elution of low molecular weight components, and maintains the aroma retaining property. Excellent.

  In general, it is known that a cyclic polyolefin-based resin has a high intermolecular force during melt film formation and causes aggregation between polymers. As a result, it is difficult to obtain a uniform film surface by agglomerating the resin throughout the film to form a knob-like gel mass. This tendency becomes more prominent at the time of film formation by the inflation method, and the cyclic polyolefin resin film obtained by the method generates innumerable gel lumps on the entire surface. However, according to the present invention, by mixing an olefin resin having a high flow rate with the cyclic polyolefin resin, uneven aggregation of the molecules of the cyclic polyolefin resin is suppressed. Therefore, in the present invention, the cyclic polyolefin resin composition constituting the sealant film is easy to form, and can form a beautiful film that is homogeneous and has good transparency. Moreover, the same effect can be obtained also at the time of high-speed film formation by the inflation method.

  Furthermore, since the standing pouch of the present invention has excellent low adsorptivity and impact resistance, it is particularly suitable as a refilling standing pouch that requires high impact resistance and a pharmaceutical packaging bag that requires low adsorptivity. Can be used for

It is a schematic sectional drawing which shows the example about the layer structure of the sealant film used for the standing pouch of this invention. It is a schematic sectional drawing which shows the example about the layer structure of the laminated body which comprises the standing pouch of this invention. It is a schematic sectional drawing which shows the example about the layer structure of the laminated body which comprises the standing pouch of this invention.

The above-described present invention will be described in more detail below.
<1> Layer configuration of the sealant film used in the standing pouch of the present invention and a laminate using the same Fig. 1 to Fig. 3 are schematic diagrams showing an example of the layer configuration of the sealant film used in the present invention and a laminate having the sealant film. FIG.
In the present invention, as shown in FIG. 1, the sealant film is basically composed of three layers of a first polyolefin resin layer 1, a cyclic polyolefin resin composition layer 2, and a second polyolefin resin layer 3. And

  Moreover, as a laminated body which comprises the standing pouch of this invention, as shown in FIG. 2, the laminated body which has the sealant film A and the base material layer B can be mentioned. In this laminate, the second polyolefin resin layer 3 forms the outermost layer. The sealant film A and the base material layer B may be laminated by laminating via the adhesive layer 4. In addition, the resin and the resin composition constituting each layer of the sealant film can be directly laminated without interposing the adhesive layer by coextrusion coating on the base material layer B. The base material layer B may have an arbitrary configuration depending on the packaging application.

As a specific aspect of the base material layer B, as shown in FIG. 3, an aspect composed of a polyethylene terephthalate (PET) film 5, an adhesive layer 6, an aluminum foil 7, an adhesive layer 8, and a nylon film 9 is taken as an example. Can be mentioned.
Hereinafter, the resin names used in the present invention are those commonly used in the industry. In the present invention, the density was measured according to JIS K7112.

<2> Cyclic polyolefin resin composition layer The cyclic polyolefin resin composition layer of the sealant film is composed of a cyclic polyolefin resin composition containing a cyclic polyolefin resin and an olefin resin.

Cyclic polyolefin-based resin In the present invention, the cyclic polyolefin-based resin is a ring-opening metathesis polymer (COP) obtained by polymerizing a cyclic olefin by a metathesis ring-opening polymerization reaction, and a copolymer of a cyclic olefin and an α-olefin (chain olefin). Includes polymers, ie cyclic olefin copolymers (COC).

  As the cyclic olefin, any cyclic hydrocarbon having an ethylenically unsaturated bond and a bicyclo ring can be used, particularly those having a bicyclo [2.2.1] hept-2-ene (norbornene) skeleton. preferable.

Specifically, bicyclo [2.2.1] hept-2-ene and derivatives thereof, tricyclo [4.3.0.1 ^2.5 ] -3-decene and derivatives thereof, tricyclo [4.4.0.1 ^2.5] -3-undecene and derivatives thereof, tetracyclo [4.4.0.1 ^2.5 .1 ^7.10] -3-dodecene and derivatives thereof, pentacyclo ^{[6.5.1.1 3.6 .0 2.7 .0 9.13]} - 4 pentadecene and its derivatives, pentacyclo ^{[7.4.0.1 2.5 .1 9.12 .0 8.13]} -3- pentadecene and its derivatives, pentacyclo ^{[6.5.1.1 3.6 .0 2.7 .0 9.13]} - 4,10 penta decadiene and its derivatives, pentacyclo ^{[8.4.0.1 2.5 .1 9.12 .0 8.13]} -3- hexadecene and it derivatives, and the like, without limitation. The cyclic olefin may have a polar group such as an ester group, a carboxyl group, and a carboxylic anhydride group as a substituent.

As the α-olefin copolymerized with the cyclic olefin, ethylene, an α-olefin having 3 to 20 carbon atoms can be used, and specifically, ethylene, propylene, 1-butene, 1-pentene, 3-methyl. Examples include -1-butene, 1-hexene, 4-methyl-1-pentene, and preferably ethylene.
In the present invention, the production of the ring-opening metathesis polymer is not particularly limited as long as it is a known ring-opening metathesis polymerization reaction, and can be produced by ring-opening polymerization of the above cyclic olefin using a polymerization catalyst. .

In the production of the cyclic olefin copolymer, 25 to 45 mol% of α-olefin and 55 to 75 mol% of cyclic olefin are randomly polymerized using a single site catalyst such as a metallocene catalyst or a multisite catalyst. Is made by
Ring-opening metathesis polymer and a cyclic olefin copolymer are preferably used in the present invention, some are commercially available, for example, Nippon Zeon Co., Ltd. of "ZEONOR ^(R)" and manufactured by Polyplastics Co., Ltd., "TOPAS ^{(R )} "And the like.

Olefin resin cyclic polyolefin resin, by mixing the high flow of the olefin resin, prevent the occurrence of gel lumps due to aggregation of the cyclic polyolefin resin together at the time of film formation, it is possible to obtain a uniform film surface .
In the present invention, the olefin-based resin has an arbitrary melt flow rate (MFR) at 190 ° C. of 5 to 40 g / 10 minutes, preferably 10 to 35 g / 10 minutes, and more preferably 15 to 30 g / 10 minutes. Olefin resins can be used.

If the melt flow rate is less than 5 g / 10 min, the cyclic polyolefin resin cannot be provided with appropriate fluidity, and the generation of a gel lump cannot be prevented.
On the other hand, if the melt flow rate is larger than 40 g / 10 min, the film forming ability is lost, and it becomes difficult to obtain a uniform film.
In the present invention, the melt flow rate is measured according to JIS-K-7210 (190 ° C., load 2.16 kg).

Examples of the olefin resin include low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, and polypropylene.
Specifically, “Novatec ^(R) ” manufactured by Nippon Polyethylene Co., Ltd. can be used.

Cyclic polyolefin-based resin composition In the cyclic polyolefin-based resin composition, the olefin-based resin is blended in the resin composition at a ratio of 3 to 50 mass%, preferably 5 to 10 mass%.
Further, if necessary, an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antiblocking agent, a lubricant (fatty acid amide, etc.), a flame retardant, an inorganic or organic filler, a crosslinking agent, a dye, A coloring agent such as a pigment, and further, one or more additives such as a modifying resin may be included.

If the blending ratio of the olefin resin is less than 3% by mass with respect to the entire mixture, the cyclic polyolefin resin cannot be provided with appropriate fluidity, which causes gel lump generation.
On the other hand, when the blending ratio is more than 50% by mass, film formation becomes easier, but the non-adsorption property of the cyclic polyolefin is impaired, and transparency is lowered.

<3> First and second polyolefin resin layers The first polyolefin resin layer is formed on one surface of the cyclic polyolefin resin composition layer, and the second polyolefin resin is formed on the other surface. By laminating the resin layer, the sealant film of the present invention is obtained.

  Examples of the olefin resin constituting the first and second polyolefin resin layers include, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, ethylene Acrylic acid copolymers, ethylene / acrylic acid ester copolymers, ethylene-methacrylic acid copolymers, ethylene-methacrylic acid ester copolymers, ionomers, polypropylene and the like are used.

  It is particularly preferable to use linear low density polyethylene (LLDPE) in order to have high adhesiveness with the cyclic polyolefin-based resin composition layer and to further improve the film forming stability when coextruded with the layer.

  In the present invention, the linear low-density polyethylene forming the polyolefin-based resin layer is obtained from a single-site catalyst such as a metallocene catalyst or a multi-site catalyst, and ethylene and an α-olefin having 3 to 20 carbon atoms. Copolymer. Here, specific examples of the α-olefin having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene, 1-dodecene, and the like.

  These monomers are polymerized using a polymerization method such as a low pressure method, a slurry method, a solution method, or a gas phase method. Usually, the short chain distribution has 3 to 25 short chain branches per 1000 carbons, but does not have long chain branches exceeding about 20 carbon atoms. Usually, in the linear low density polyethylene, the structural unit derived from ethylene is about 99.9 to 90 mol%, and the structural unit derived from α-olefin is about 0.1 to 10 mol%. In this invention, the linear low density polyethylene prepared with the metallocene catalyst can be used conveniently at the point which is excellent in structural uniformity.

  Examples of the linear low density polyethylene resin suitable for use in the present invention include “Sumikasen” manufactured by Sumitomo Chemical Co., Ltd.

  Furthermore, in the present invention, the main component is the polyolefin resin as described above, and if necessary, an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antiblocking agent, a lubricant (fatty acid amide, etc.). ), A flame retardant, an inorganic or organic filler, a crosslinking agent, a colorant such as a dye or a pigment, and one or more additives such as a modifying resin may be added.

<4> Manufacture of sealant film The sealant film is manufactured by an arbitrary method, but in order to obtain good film forming stability, film forming ease and interlayer adhesion, and to further increase the seal strength and low adsorptivity. Preferably, the first polyolefin resin, the cyclic polyolefin resin composition, and the second polyolefin resin are produced by co-extrusion.

  As a method of coextrusion, a multilayer sealant is obtained by coextruding the first and second polyolefin resins and the cyclic polyolefin resin composition by a film forming method such as a melt coextrusion method (for example, T-die method, inflation method). A film can be produced. Alternatively, these resins and resin compositions may be formed by coextrusion coating on an arbitrary base material layer.

  In particular, by forming a film using an inflation method, the adhesion between the three layers can be increased, and a sealant film exhibiting higher sealing strength and lower adsorptivity can be provided.

<5> Layer Thickness The sealant film may have an arbitrary layer thickness, but preferably has a layer thickness of 20 to 200 μm as a whole from the viewpoint of stable film formation and product cost. Here, the thickness of each layer can be appropriately set according to the application of the standing pouch, desired non-adsorbability and seal strength, etc., but preferably the layer thickness of the first polyolefin resin layer is From the viewpoint of product cost, it is 10 to 100 μm, more preferably 30 to 80 μm. If it is thinner than 10 μm, high sealing strength cannot be obtained, and it is unsuitable for packaging applications that require high impact resistance such as a refilling standing pouch.

  The layer thickness of the cyclic polyolefin resin composition layer is 2 to 30 μm, more preferably 5 to 15 μm. If it is thinner than this, it is difficult to form a uniform cyclic polyolefin layer, and if it is thicker, the hardness of the film increases, so that the film-forming property and workability deteriorate.

  Furthermore, the layer thickness of the second polyolefin resin layer is 10 to 100 μm, more preferably 30 to 80 μm. If it is thinner than 10 μm, high sealing strength cannot be obtained, and it is unsuitable for packaging applications that require high impact resistance such as a refilling standing pouch. On the other hand, if it is thicker than 100 μm, the amount of content components adsorbed increases, which is not preferable.

<6> Laminate The above sealant film is laminated with the surface of the first polyolefin resin layer facing the arbitrary base material layer so that the second polyolefin resin layer is the outermost layer in the laminate. And a laminated body can be obtained.

As a base material layer used here, although single layer films, such as a plastic film, or a multilayer laminated film are used, it does not specifically limit, Arbitrary films used for various packaging bags and packaging containers can be used. Among these, a suitable one is freely selected and used according to the use conditions such as the type of contents to be packaged and the presence or absence of heat treatment after filling. Specific examples of the laminate preferably used include the following, but are not limited thereto.
(1) ON film / adhesive layer / sealant film;
(2) ON film / adhesive layer / uniaxially stretched or biaxially stretched HDPE film / adhesive layer / sealant film;
(3) ON film / adhesive layer / uniaxially stretched or biaxially stretched PP film / adhesive layer / sealant film;
(4) ON film / adhesive layer / uniaxially stretched or biaxially stretched PP film / adhesive layer / aluminum foil / adhesive layer / sealant film;
(5) ON film / silica or alumina or aluminum vapor deposition layer / adhesive layer / uniaxially stretched or biaxially stretched HDPE film / adhesive layer / sealant film;
(6) ON film / anchor coating agent layer / HDPE layer / sealant layer [Here, the HDPE layer and the sealant layer are laminated on the anchor coating agent layer by a coextrusion coating method];
(7) ON film / anchor coating layer / HDPE layer / low density polyethylene (LDPE) layer / adhesive layer / sealant film [Here, the HDPE layer and the LDPE layer are formed on the anchor coating layer by a coextrusion coating method. Laminated];
(8) PET film / adhesive layer / aluminum foil / adhesive layer / ON film / adhesive layer / sealant film;
(9) PET film / adhesive layer / silica or alumina or aluminum deposited layer / ON film / adhesive layer / sealant film;
(10) PET film / adhesive layer / ON film / adhesive layer / aluminum foil / adhesive layer / sealant film;
(11) PET film / adhesive layer / EVOH film / adhesive layer / ON film / adhesive layer / sealant film.

  In the above, ON film is biaxially stretched nylon film, HDPE is high density polyethylene, LDPE is low density polyethylene, PP film is polypropylene film, PET film is biaxially stretched polyethylene terephthalate film, EVOH film is ethylene-vinyl acetate copolymer It refers to a saponified film. The anchor coat is a kind of primer coat that is pre-coated on the base film side in order to improve the adhesiveness when the resin is laminated by extrusion coating. The sealant film and the sealant layer refer to a sealant film or a sealant layer composed of a first polyolefin resin layer / a cyclic polyethylene resin composition layer / a second polyolefin resin layer.

  In these configurations, the ON film and PET film give the laminate a mechanical strength and printability as a base film, and the uniaxially stretched HDPE film and uniaxially stretched PP film have the same stretch direction as the bag tearing direction. By using in such a manner, the directionality of tearing can be stabilized. And aluminum foil, a silica vapor deposition layer, an EVOH film, etc. are laminated | stacked in order to provide gas barrier property. A printing layer and various packaging materials may be further laminated on the surface of the base film as necessary.

<7> Standing Pouch Using the above laminated body, a bag can be formed so that the second polyolefin-based resin layer becomes the innermost layer, thereby forming a packaging bag, particularly a standing pouch. Moreover, a packaging body can also be manufactured using a laminated body as a cover material which uses a 2nd polyolefin resin layer as an innermost layer.

In order to manufacture a packaging bag, the laminate of the present invention is folded in two or two laminates are prepared, the surfaces of the second polyolefin resin layers face each other, and the peripheral edge thereof For example, standing pouch type, side seal type, two-side seal type, three-side seal type, four-side seal type, envelope-attached seal type, joint-attached seal type (pillow seal type), pleated seal type, flat bottom seal type, square Heat-sealing is performed according to a heat-sealing form such as a bottom seal type or a gusset type to form various types of packaging bags.

  In the above, as a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

  To manufacture a packaging container that uses the laminate as a lid, the laminate is overlaid so that the surface of the second polyolefin resin layer is in contact with the opening of the resin container, and heat-sealed in the same manner as the bag. Can be done.

  The packaging bag or packaging container comprising the laminate of the present invention is particularly suitable for packaging chemical products, pharmaceuticals, quasi-drugs, cosmetics, foods and the like containing an organic compound as an active ingredient, for example, an outer bag of a patch. Or as a standing pouch for use in refill contents such as liquid detergents, liquid softeners and liquid soaps. In particular, since the laminate of the present invention exhibits not only low adsorptivity but also excellent sealing strength, a packaging bag that requires high impact resistance such as a standing pouch that needs to be filled with a large volume of liquid. Suitable for manufacturing.

  As a manufacturing method of the standing pouch, the body of the bag, that is, the laminate for the body forming the side surface, and the laminate of the present invention as the laminate for the bottom material forming the bottom, the sealant surfaces are bonded to each other. It is obtained by placing them facing each other and heat-sealing them into a standing pouch mold.

  In addition, the laminate of the present invention is used as a laminate for a trunk, and another laminate exhibiting higher sealing strength than that of the present invention is used as a laminate for a bottom material, thereby maintaining good low adsorptivity. However, the impact resistance of the bag can be further enhanced. For example, a standing pouch having extremely high impact resistance is manufactured by using a laminate having a sealant layer made of polyolefin resin and having a thickness of 50 μm or more, preferably 50 to 200 μm, as a laminate for a bottom material. be able to.

  As a more specific manufacturing method of the standing pouch, for example, two body laminates are prepared, and the sealant surfaces are arranged to face each other. Next, a bottom material laminate having a mountain fold in the center with the sealant surface facing outward is inserted into these lower ends, and a gusset portion is provided to heat seal the peripheral portion. A self-supporting bottom can be formed by heat-sealing the gusset portion into a boat bottom seal type. Moreover, you may provide a spout part in the corner part of a pouch upper part using the bag making machine provided with the heat seal part which forms a spout part, and the punching part for notching the both sides.

In order to manufacture the package by filling the contents, after filling the contents from the filling port left without sealing, the filling port is heat-sealed by, for example, a degassing seal or the like and sealed.
Next, the present invention will be specifically described with reference to examples.

[Example 1]
(1) 90% by mass of cyclic olefin copolymer (TOPAS ^(R) 8007-F04 manufactured by Polyplastics Co., Ltd .; melt flow rate 1.9 g / 10 min (190 ° C.); density 1.02 g / cm ³ ), and A mixture containing 10% by mass of low-density polyethylene (Suntech M6525 manufactured by Asahi Kasei Chemicals Corporation; melt flow rate 28.0 g / 10 min (190 ° C.); density 0.916 g / cm ³ ) is sufficiently kneaded to obtain a cyclic polyolefin. A system resin composition was prepared.
(2) The obtained cyclic polyolefin-based resin composition, linear low density polyethylene (Evolue SP2020 manufactured by Prime Polymer; melt flow rate 2.3 g / 10 min (190 ° C.); density 0.916 g / cm ³ ) Are coextruded by multilayer inflation film formation, and the first linear low-density polyethylene resin layer (thickness 60 μm) / cyclic polyolefin-based resin composition layer (thickness 10 μm) / second linear low-density polyethylene resin A sealant film having a layer structure (thickness: 60 μm) was produced.
(3) On the other hand, a biaxially stretched polyester film (PET; ester ^(R) E5100 manufactured by Toyobo Co., Ltd .; thickness 12 μm) was used, and an adhesive (DIC Dick Dry manufactured by DIC Corporation) CX703 / KR90; compounding ratio 15/1) was applied at a coating amount of 3.0 g / m ² using a pyramid plate having a plate depth of 110 μm, and an aluminum foil having a thickness of 7 μm (A1N30H-O manufactured by Nippon Foil Co., Ltd.) And pasted together. An adhesive was similarly applied onto this aluminum foil, and a nylon film (Emblem ONBC, manufactured by Unitika Ltd., thickness 15 μm) was bonded to produce a base material layer.
(4) Apply an adhesive in the same manner to the surface of the base material layer provided with the nylon film, and bond the sealant film produced in (2) above, and then store it in a constant temperature bath at 40 ° C. for 48 hours. The agent was cured to produce a body laminate. The layer structure was as follows:
PET film / adhesive layer / aluminum foil / adhesive layer / nylon film / adhesive layer / first linear low-density polyethylene resin layer / cyclic polyolefin-based resin composition layer / second linear low-density polyethylene Resin layer (5) On the other hand, an adhesive was similarly applied to the surface of the base material layer provided with the nylon film, and linear low-density polyethylene (Prime Polymer Evolution SP2020; melt flow rate 2.3 g / 10 min ( 190 ° C.); a sealant film (thickness 130 μm) having a density of 0.916 g / cm ³ ), and then stored in a constant temperature bath at 40 ° C. for 48 hours to cure the adhesive and laminate the bottom material Manufactured. The layer structure was as follows:
PET film / adhesive layer / aluminum foil / adhesive layer / nylon film / adhesive layer / linear low density polyethylene resin layer (6) Using the body laminate and bottom material laminate obtained above. Thus, a standing pouch having outer dimensions: height 237 mm × width 130 mm, bottom folding portion height 35 mm, and seal width 5 mm was manufactured. The bottom was heat-sealed with a boat-bottom seal pattern.

[Example 2]
A standing pouch was produced in the same manner as in Example 1 except that the laminate for body material described in Example 1 was used as the laminate for bottom material.

[Comparative Example 1]
A standing pouch is formed in the same manner as in Example 1 except that the layer structure of the sealant film of the body laminate is a single-layer structure including only the first linear low-density polyethylene resin layer (thickness 130 μm). Manufactured.

[Comparative Example 2]
Implemented except that the layer structure of the sealant film of the body laminate is a two-layer structure of cyclic polyolefin resin composition layer (thickness 10 μm) / second linear low-density polyethylene resin layer (130 μm) A standing pouch was produced in the same manner as in Example 1.

[Evaluation methods and results]
(1) Adsorption test About the standing pouches of Examples 1 and 2 and Comparative Example 1, after filling 100 ml of menthol-ethanol solution prepared so that the menthol concentration was 5 μg / ml from the upper opening, the opening was Sealed with a degassing seal.

After storage for 2 weeks in an atmosphere at 50 ° C., the menthol content in the solution was measured by the GC / MS method to determine the adsorption amount.
The results are shown in the following table.

  The standing pouches of Examples 1 and 2 showed excellent low adsorptivity. In contrast, Comparative Examples 1 and 2 adsorbed a large amount of menthol.

(2) Seal strength test For the standing pouches of Examples 1 and 2 and Comparative Examples 1 and 2, the body laminate and the bottom laminate were laminated with the sealant surfaces facing each other, and a heat sealer (tester It was heat-sealed with a pressure of 1 kgf / cm ² at 170 ° C. for 1 second using a TP-701S HEAT SEAL TESTER manufactured by Industry Co.

Subsequently, this was cut out into a strip shape with a width of 15 mm, and the sealed seal part was peeled off using a Tensilon tensile tester (RTC-1310A manufactured by Orientec Co., Ltd.), and the seal strength was measured. The tensile speed at this time was 300 mm / min.
The results are shown in the following table.

  The laminates constituting the standing pouches of Examples 1 and 2 showed sufficiently high seal strength to be used as a standing pouch. On the other hand, the laminate of Comparative Example 2 that does not have the first polyolefin resin layer shows lower sealing strength than the laminate of Comparative Example 1 that has a linear low-density polyethylene resin layer having the same thickness as the innermost layer. It was.

(3) Drop impact test About the standing pouch of Example 1, after filling 450 ml of water from the upper opening part, the opening part was sealed. This was dropped 20 times from a height of 120 cm. As a result, the standing pouch of Example 1 did not break even after being dropped 20 times.

  In addition, as for the standing pouch of Example 2, the same test was conducted. As a result, the bag was not broken after being dropped five times.

1. 1st polyolefin resin layer 2. Cyclic polyolefin resin composition layer Second polyolefin resin layer 4. 4. Adhesive layer PET film6. 6. Adhesive layer Aluminum foil8. 8. Adhesive layer Nylon film Sealant film Base material layer

Claims (4)

A laminated body comprising a sealant layer, a low adsorptive Stan Funding pouch that having a body portion and a bottom portion,
The sealant layer of the body laminate that forms the body portion includes at least a first polyolefin resin layer, and a cyclic polyolefin resin composition layer laminated adjacently on the first polyolefin resin layer. A layer comprising a sealant film having a second polyolefin resin layer laminated adjacently on the cyclic polyolefin resin composition layer,
The second polyolefin resin layer is the outermost layer in the laminate for body material,
Here, the cyclic polyolefin-based resin composition includes a cyclic polyolefin-based resin and an olefin-based resin, and the olefin-based resin has a melt flow rate at 190 ° C. of 5 to 40 g / 10 minutes, and the Present in the resin composition in a proportion of 3 to 50% by mass;
The polyolefin resin constituting the first and second polyolefin resin layers is a linear low density polyethylene resin,
Sealant layer of base material laminate for forming the bottom, characterized in that a layer comprising a polyolefin resin, a low adsorptivity Stan loading pouch. The sealant film is formed by coextrusion of the first polyolefin resin layer, the cyclic polyolefin resin composition layer, and the second polyolefin resin layer. low absorptive Stan loading pouch according to 1. The thickness of the first polyolefin resin layer is 10 to 100 μm, the thickness of the cyclic polyolefin resin composition layer is 2 to 30 μm, and the thickness of the second polyolefin resin layer is 10 to 100 μm. , wherein the thickness of the sealant layer of the base material for the laminate is 50 to 200 [mu] m, low absorptive Stan loading pouch according to claim 1 or 2. Low absorptive Stan Funding pouch formed by filling the contents into packaging according to any one of claims 1-3.

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