Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
  • A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
  • A61J1/03—Containers specially adapted for medical or pharmaceutical purposes for pills or tablets
  • A61J1/035—Blister-type containers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
  • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
  • B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
  • B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
  • B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
  • B65D75/325—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil
  • B65D75/327—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil and forming several compartments
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/31—Heat sealable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/582—Tearability
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7244—Oxygen barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7246—Water vapor barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/70—Food packaging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2439/00—Containers; Receptacles
  • B32B2439/80—Medical packaging

Definitions

• the present invention relates to an easily breakable film and a package.
• PTP packaging is used for packaging pharmaceutical products such as tablets and capsules, foods, and the like.
• This PTP packaging generally consists of a blister container in which a resin-based sheet is provided with a recess for accommodating the packaged object, and a container for covering the recess from the back side of the blister container after storing a capsule or the like in the recess. It consists of an aluminum film that serves as the lid material.
• a heat-sealable resin (A) layer As a laminated film for PTP covers that can be used in place of PTP cover films in which aluminum foil has been used, a heat-sealable resin (A) layer, a cyclic olefin resin (B) layer, It has a heat-sealable heat-resistant resin (C) layer, and these layers are laminated in the order of (A) layer / (B) layer / (C) layer, and the puncture strength using a metal needle with a tip diameter of 1 mm is A laminated film for PTP covers with a thickness of less than 5N has been reported (see, for example, Patent Document 1).
• An object of the present invention is to solve the problems in the conventional art and achieve the following objects. That is, an object of the present invention is to provide an easy-to-break film that has excellent breakability and is made into a monomaterial.
• the present invention is based on the above findings by the present inventors, and means for solving the above problems are as follows. That is, ⁇ 1> An easily breakable film having a base layer containing a cyclic olefin resin on its surface, The easy-to-break film is characterized in that the thickness of the base layer is 40% or more of the total thickness of the easy-to-break film. ⁇ 2> The easily breakable film according to ⁇ 1>, wherein the base layer contains a cyclic olefin resin having a glass transition temperature of 60° C. or higher.
• ⁇ 3> The easily breakable film according to ⁇ 1> or ⁇ 2>, wherein the base layer includes a surface resin layer on the front side and an inorganic substance-containing layer containing an inorganic substance.
• the base layer includes a surface resin layer on the front side and an inorganic substance-containing layer containing an inorganic substance.
• ⁇ 4> The easily breakable film according to ⁇ 3>, wherein the content of the inorganic substance is 0.1% by mass or more and 10% by mass or less based on the total amount of the easily breakable film.
• ⁇ 5> The easily breakable film according to any one of ⁇ 1> to ⁇ 4>, further comprising a heat-sealing layer on the side opposite to the surface.
• ⁇ 6> The easily breakable film according to any one of ⁇ 1> to ⁇ 5>, which has an extrusion strength of 35 N or less when extruded using a jig having a flat tip with a diameter of 13 mm.
• ⁇ 7> The easily breakable film according to any one of ⁇ 1> to ⁇ 6>, further comprising a water vapor and/or oxygen barrier layer.
• ⁇ 8> The easily breakable film according to ⁇ 1> above, which is a lid material for a package.
• ⁇ 9> A container having a concave portion and a lid material, The package is characterized in that the lid material is the easily breakable film according to any one of ⁇ 1> to ⁇ 8>.
• ⁇ 10> The package according to ⁇ 9> above, which is used for food and beverage packaging or medical use.
• FIG. 1 is a schematic cross-sectional view showing an example of the easily breakable film of the present invention.
• FIG. 2 is a schematic cross-sectional view showing another example of the easily breakable film of the present invention.
• FIG. 3 is a schematic cross-sectional view showing an example of the package of the present invention.
• the package of the present invention includes a container (bottom material) having a recessed portion and a lid material, and the lid material is the easily breakable film of the present invention described below.
• the lid material can be thermally bonded (heat-sealed) to the opening of the container. It is preferable that the package is for food and drink packaging or medical use.
• the package is a PTP (Press Through Package), and specifically includes a container (bottom material) having a plurality of independent recesses and a lid material, and has a cover material in the recesses.
• Examples include packaging formats in which after the contents (also referred to as the contents) are contained, a lid material is placed over the container, the air is degassed, or the air is replaced with an inert gas, etc., and the contact area between the container and the lid material is heat-sealed. It will be done.
• the package preferably has a container such as a paper pack or a plastic cup, and a lid material as a straw insertion opening, and specifically, a contact portion between the container and the lid material.
• the container part After creating a heat-sealed package, the container part is filled with a beverage or other object and sealed; after the beverage or other object is placed in the container, a lid is placed on it and the air is degassed.
• a packaging form in which the container is replaced with an inert gas or the like, and the contact area between the container and the lid material is heat-sealed.
• the shape of the recess and the seal width or area between the lid and the container vary depending on the shape and form of the object to be packaged and cannot be unambiguously defined, but there are no particular limitations. It can be selected as appropriate depending on the intended application form.
• the package is for food and drink packaging or medical use.
• the pharmaceuticals used for medical purposes are not particularly limited and can be appropriately selected depending on the purpose, to which a PTP (Press Through Package) packaging form is applied, such as tablets, capsules, etc. .
• the food and beverages are not particularly limited and can be selected as appropriate depending on the purpose, such as supplements, chocolate, ramune, gummy food in the form of tablets; paper packs with lids that serve as straw openings; Examples include beverages contained in packaging such as plastic cups.
• the easily breakable film of the present invention is an easily breakable film that has a base layer containing a cyclic olefin resin on its surface, and the thickness of the base layer is 40% or more of the total thickness of the easily breakable film.
• the easily breakable film can be suitably used as a lid material for the package.
• "easily broken" means that the film is torn and cut off when force is applied, and may be easily extruded or easily pierced.
• “Easy extrusion” refers to the fact that when force is applied to the film from the outside of the container (bottom material) through the object (for example, a tablet), the film breaks and the object can be pushed out. means. "Easy extrudability" can be evaluated by measuring the extrusion strength when extruding a fixed film using a jig having a flat tip (for example, a circular shape with a diameter of 13 mm).
• the extrusion strength of the easily breakable film when extruded using a jig having a circular and flat tip with a diameter of 13 mm is preferably 35 N or less, more preferably 25 N or less, and even more preferably 20 N or less. When the extrusion strength is 35N or less, it has good extrudability. Specifically, the extrusion strength was determined by fixing a film to be measured, such as an easily breakable film, between two sheets of stainless steel with a hole (diameter: 55 mm) in the center, and using a 13 mm flat plate tip.
• “Easy to pierce” means that when a force is applied to press the tip against the film, the film is torn and the tip can penetrate the film. Examples include the tip of a drinking straw, etc. "Easy to pierce” can be evaluated by extruding the fixed film using, for example, a jig having a metal needle with a tip diameter of 1 mm.
• the easily breakable film has a base material layer on the surface, and the base material layer may be in a combination mode consisting of a surface resin layer on the surface side and an inorganic substance-containing layer containing an inorganic substance, or the surface resin layer alone.
• the inorganic material-containing layer may be a single layer. It is preferable that the easily breakable film further has a heat seal layer on the side opposite to the front surface.
• the easily breakable film may further have other layers such as a barrier layer and a printed layer on the surface side of the base layer.
• One embodiment of the easily breakable film is an easily breakable film that has at least a base material layer and a heat seal layer, and is laminated in the order of base material layer/heat seal layer.
• Another embodiment of the easily breakable film includes at least a surface resin layer (A), an inorganic material-containing layer (B), and a heat seal layer (C), and the surface resin layer (A) and the inorganic material
• This is an easily breakable film in which the containing layer (B) and the heat-sealing layer (C) are laminated in the order of (A)/(B)/(C).
• the base material layer or surface resin layer (A) is on the outside of the package, and the heat-sealing layer (C) is on the inside of the package, forming a heat-sealing surface with the container (bottom material).
• the container of the package can be heat-sealed by the heat-sealing layer (C) of the easily breakable film.
• the easily breakable film can be suitably used as the easily breakable film for a package of the present invention.
• the easily breakable film is preferably a coextruded easily breakable film having at least a surface resin layer (A), an inorganic substance-containing layer (B), and a heat seal layer (C).
• the easily breakable film has other layers ( ⁇ ) such as a barrier layer and a printed layer on the surface resin layer (A) side, and ( ⁇ )/(A)/(B)/(C). It is preferable that the easily breakable film be laminated in the following order.
• the base material layer contains a cyclic olefin resin as a main resin component.
• the resin component may contain an olefin resin that does not have a cyclic structure, if necessary, but is preferably composed of a cyclic olefin resin.
• the base material layer may be a combination of a surface resin layer and an inorganic substance-containing layer, or may be a surface resin layer alone, or an inorganic substance-containing layer alone.
• the base layer may be a surface layer that can be provided with printing.
• the surface resin layer (A) contains a cyclic olefin resin as a main resin component, and may contain an olefin resin without a cyclic structure if necessary, but is preferably made of a cyclic olefin resin.
• the surface resin layer (A) may be a surface layer on which printing can be provided.
• the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include norbornene polymers, vinyl alicyclic hydrocarbon polymers, and cyclic conjugated diene polymers.
• Examples of the norbornene polymer include ring-opening polymers of norbornene monomers (hereinafter referred to as "COP"), norbornene copolymers (hereinafter referred to as (referred to as "COC”), COP, and hydrogenated products of COC.
• COP norbornene monomers
• COC norbornene copolymers
• COC ring-opening polymers of norbornene copolymers
• COP norbornene copolymers
• hydrogenated products of COC Among the cyclic olefin resins, norbornene polymers are preferred, and hydrogenated products of COP and COC are more preferred.
• the weight average molecular weight of the cyclic olefin resin is not particularly limited
• the norbornene polymer and the norbornene monomer used as a raw material are alicyclic monomers having a norbornene ring.
• Examples of the norbornene monomer include norbornene, tetracyclododecene, ethylidenenorbornene, vinylnorbornene, ethylidetetracyclododecene, dicyclopentadiene, dimetanotetrahydrofluorene, phenylnorbornene, methoxycarbonylnorbornene, and methoxycarbonyltetra Examples include cyclododecene. These may be used alone or in combination of two or more.
• the norbornene-based copolymer is a copolymer of the norbornene-based monomer and an olefin copolymerizable with the norbornene-based monomer.
• olefins copolymerizable with the norbornene monomer include olefins having 2 to 20 carbon atoms such as ethylene, propylene, and 1-butene; cycloolefins such as cyclobutene, cyclopentene, and cyclohexene; - Non-conjugated dienes such as hexadiene. These may be used alone or in combination of two or more.
• the cyclic olefin resin may be a commercially available product or a synthetic product.
• the commercially available products include ring-opening polymers (COP) of norbornene monomers such as "ZEONOR” manufactured by Nippon Zeon Co., Ltd.; and norbornene copolymers (COC) such as those manufactured by Mitsui Chemicals Co., Ltd. "APPEL” manufactured by Polyplastics Co., Ltd., “TOPAS” manufactured by Polyplastics Co., Ltd., etc.
• the melt volume rate (MVR) of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, but in the case of measurement conditions of temperature 230 ° C. and load 2.16 kg, it is 1.0 cm 3 /10 minutes to 50.0 cm 3 /10 minutes is preferable, 1.0 cm 3 /10 minutes to 20.0 cm 3 /10 minutes is more preferable, and 2.0 cm 3 /10 minutes to 18.0 cm 3 /10 minutes is still more preferable. Preferably, 2.0 cm 3 /10 minutes to 15.0 cm 3 /10 minutes is particularly preferable.
• melt volume rate is a value measured at a temperature of 230° C. or 260° C. and a load of 2.16 kg (21.18 N) in accordance with JISK7210.
• the glass transition point (Tg) of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 60°C or higher, more preferably 75°C or higher. Two or more types of cyclic olefin resins having different Tg may be used in combination, and the Tg of the cyclic olefin resin having a high Tg is preferably 100°C or higher, more preferably 125°C or higher.
• the surface resin layer contains a cyclic olefin resin having a Tg of 100° C. or more.
• the amount is preferably 50% by mass or more, more preferably 75% by mass or more, and even more preferably 90% by mass or more, in terms of the easily tearable film obtained and excellent rigidity.
• the base layer in the easily breakable film is composed of a surface resin layer and an inorganic material-containing layer
• the surface resin layer and the inorganic material-containing layer contain a cyclic olefin resin having a Tg of 100° C. or higher.
• the amount is preferably 30% by mass or more, and more preferably 40% by mass or more, since the resulting easily breakable film has excellent breakability and rigidity.
• the glass transition point (Tg) of the cyclic olefin resin is not particularly limited and can be appropriately selected depending on the purpose, but it is possible to manufacture it by coextrusion lamination method with other resin layers. From the viewpoint of industrial availability of raw materials, the temperature is preferably 200°C or lower. The glass transition point can be measured using a differential scanning calorimeter (DSC) (for example, DSC-7020, manufactured by Hitachi High-Tech Science Co., Ltd.).
• DSC differential scanning calorimeter
• Norbornene-based copolymers with a high glass transition point have low tensile strength and may be easily cut or torn, so they may have poor film-forming properties, suitability for take-up and winding during slitting, and lamination strength.
• a high Tg product and a low Tg product having a glass transition point of less than 100° C. may be used together to adjust the physical property balance.
• the strength can be improved by blending COC with a Tg of less than 100°C.
• an olefin resin having good compatibility with COC and having no cyclic structure such as propylene resin or ethylene resin, may be blended.
• the thickness ratio of the base material layer is 40% or more, preferably 50% or more, and more preferably 60% or more with respect to the total thickness of the easily breakable film.
• the average thickness of the base material layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 5 ⁇ m to 40 ⁇ m, more preferably 10 ⁇ m to 36 ⁇ m.
• the thickness ratio of the surface resin layer (A) is not particularly limited and can be appropriately selected depending on the purpose, but when the base material layer is used in combination with the total thickness of the easily broken film, it is 10 % to 90%, more preferably 15% to 80%; when the base layer is a single surface resin layer, it is preferably 40% to 95%, more preferably 50% to 90%.
• the average thickness of the surface resin layer (A) is not particularly limited and can be appropriately selected depending on the purpose, but when the base material layer is used in combination, it is preferably 2 ⁇ m to 38 ⁇ m, more preferably 2.5 ⁇ m to 35 ⁇ m. ; When the base material layer is a single surface resin layer, the thickness is preferably 5 ⁇ m to 40 ⁇ m, more preferably 8 ⁇ m to 36 ⁇ m.
• the inorganic material-containing layer (B) contains a cyclic olefin resin as a main resin component, further contains an inorganic material, and contains other components as necessary.
• the resin component may contain an olefin resin that does not have a cyclic structure, if necessary, but is preferably composed of a cyclic olefin resin.
• cyclic olefin resin As the cyclic olefin resin, the items explained in connection with the base layer and the surface resin layer (A) can be selected as appropriate.
• the inorganic substance is not particularly limited and can be selected as appropriate depending on the purpose; for example, calcium carbonate, talc, silica, alumina, clay, antimony oxide, aluminum hydroxide, magnesium hydroxide, hydrotalcite, calcium silicate. , magnesium oxide, potassium titanate, barium titanate, titanium oxide, calcium oxide, magnesium oxide, manganese dioxide, boron nitride, aluminum nitride, and the like.
• the inorganic substances may be used alone or in combination of two or more.
• one or more selected from the group consisting of calcium carbonate, silica, alumina, aluminum hydroxide, barium titanate, talc, boron nitride, and aluminum nitride are preferred; calcium carbonate, alumina, aluminum hydroxide, and More preferably, one or more types selected from the group consisting of talc.
• the particle size, fiber length, fiber diameter, and other shapes of the inorganic filler are not particularly limited, and may be adjusted as appropriate depending on the intended use.
• the surface treatment state of the inorganic filler is not particularly limited, and the surface may be modified with, for example, saturated fatty acids depending on the intended use.
• the above-mentioned inorganic filler may be used in the form of being pre-blended with the thermoplastic resin, or may be used in the form of a masterbatch.
• the content of the inorganic substance is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 10% by mass or less, and 1% by mass, based on the total amount of the easily breakable film.
• the content is more preferably 5% by mass or less. When the content is 0.1% by mass or more and 10% by mass or less, easy breakability is excellent, and barrier properties and film formability are also good.
• the thickness ratio of the inorganic substance-containing layer (B) is not particularly limited and can be appropriately selected depending on the purpose, but when the base material layer is used in combination with the total thickness of the easily broken film, it is 10 % to 90% is preferable, and 15% to 50% is more preferable; when the base layer is a single inorganic substance-containing layer, 40% to 95% is preferable, and 50% to 90% is more preferable.
• the average thickness of the inorganic substance-containing layer (B) is not particularly limited and can be appropriately selected depending on the purpose, but when the base material layer is used in combination, it is preferably 2 ⁇ m to 38 ⁇ m, and 2.5 ⁇ m to 35 ⁇ m. More preferably; when the base layer is a single inorganic substance-containing layer, the thickness is preferably 5 ⁇ m to 40 ⁇ m, more preferably 8 ⁇ m to 36 ⁇ m.
• the heat-sealing layer (C) contains a known thermoplastic resin that imparts heat-sealing properties as a main resin component, and further contains other resins and components as necessary.
• thermoplastic resin is not particularly limited and can be appropriately selected from known thermoplastic resins depending on the purpose, such as ⁇ -olefin resins, styrene resins, ester resins, acrylic resins, and the above-mentioned cyclic olefin resins. It will be done. Among these, ⁇ -olefin resins are preferred since they can provide good heat-sealability.
• ⁇ -olefin resin examples include monopolymers of ⁇ -olefin monomers (polyethylene monopolymers, polypropylene monopolymers, etc.); copolymers mainly composed of ⁇ -olefin monomers (propylene-ethylene block copolymers, etc.); polymers, propylene-ethylene random copolymers, ethylene-butene-1 copolymers, propylene-butene-1 copolymers, etc.). These may be used alone or in combination of two or more.
• the thickness ratio of the heat-sealing layer (C) is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 20% to 60%, and 30% to the total thickness of the easily breakable film. ⁇ 60% is more preferred.
• the average thickness of the heat-sealing layer (C) is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 4 ⁇ m to 28 ⁇ m, more preferably 6 ⁇ m to 25 ⁇ m.
• the heat-sealing layer is disposed on the base layer directly or via an arbitrary layer such as an anchor coat layer.
• the heat-sealing layer (C) can be formed by extruding the resin and the like together with the base layer using a coextrusion method. Alternatively, it can be provided by coating a heat sealing agent in which the resin or the like is dispersed or dissolved in a solvent. As such a heat sealing agent, a commercially available hot melt sealing agent can also be used. The heat sealing agent can be applied entirely or partially to a desired outermost surface of the laminate.
• the heat sealing agent is not particularly limited, and may be a type in which a thermoplastic resin having heat sealability is dissolved in an organic solvent, a type in which a thermoplastic resin having heat sealing properties is dissolved in water or an aqueous organic solvent, or a type in which a thermoplastic resin having heat sealing properties is dissolved in water or an aqueous organic solvent, or a type in which a thermoplastic resin having heat sealing properties is dissolved in an aqueous organic solvent. It may be in any form such as an emulsion type.
• resins having heat-sealing properties include shellacs, rosins, rosin-modified maleic acid resins, rosin-modified phenolic resins, nitrified cotton, cellulose acetate, cellulose acetyl propionate, cellulose acetyl butyrate, chlorinated rubber, and cyclized rubber.
• Rubber vinyl chloride, vinylidene chloride, polyamide resin, vinyl chloride-vinyl acetate copolymer, polyester resin, ketone resin, butyral resin, chlorinated polypropylene resin, chlorinated polyethylene resin, chlorinated ethylene vinyl acetate resin, ethylene vinyl acetate resin
• thermoplastic resins such as acrylic resin, urethane resin, ethylene-vinyl alcohol resin, styrene maleic acid resin, casein, and alkyd resin. These may be used alone or in combination of two or more.
• the organic solvent is not particularly limited and can be selected as appropriate depending on the purpose; for example, aromatic hydrocarbons such as toluene, xylene, Solvesso #100, Solvesso #150; hexane, heptane, octane, decane, etc. Aliphatic hydrocarbons; various ester-based organic solvents such as methyl acetate, ethyl acetate, isopropyl acetate, butyl acetate, amyl acetate, ethyl formate, and butyl propionate; and the like.
• aqueous organic solvents examples include alcohols such as methanol, ethanol, propanol, and butanol; ketones such as acetone, methyl ethyl ketone, and cyclohaxanone; ethylene glycol (mono, di) methyl ether, and ethylene glycol (mono, di) ethyl ether.
• the heat sealing agent may further contain other components.
• lubricants such as waxes and fillers, antifoaming agents, plasticizers, leveling agents, emulsifiers, dispersion stabilizers, surfactants, tackifiers, preservatives, antibacterial agents, rust preventives
• examples include antioxidants, crosslinking agents, curing agents, curing catalysts, light stabilizers, ultraviolet absorbers, photocatalytic compounds, dyes, inorganic pigments, organic pigments, extender pigments, and antistatic agents.
• the wax is not particularly limited and can be selected as appropriate depending on the purpose; for example, fatty acid amide wax, carbana wax, polyolefin wax such as polyethylene wax or polypropylene wax; paraffin wax, Fischer-Tropsch wax, beeswax, micro wax, etc.
• fatty acid amide wax, carbana wax, polyolefin wax such as polyethylene wax or polypropylene wax
• paraffin wax Fischer-Tropsch wax
• beeswax micro wax
• Examples include crystalline wax, oxidized polyethylene wax, amide wax; coconut oil fatty acid, soybean oil fatty acid; and the like. These may be used alone or in combination of two or more.
• By using wax blocking resistance can be improved. It is preferable to use polyethylene wax because it can improve blocking resistance without reducing heat sealability.
• the amount of wax blended is not particularly limited and can be selected as appropriate depending on the purpose, but it is preferably 0.1% to 20% by mass based on the total amount of thermoplastic resin, and it improves heat sealability and blocking resistance. From the viewpoint of balance, 3% by mass or more and 15% by mass or less is more preferable.
• the filler is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include silica, calcium carbonate, calcium phosphate, talc, urethane beads, acrylic beads, melamine beads, and the like. These may be used alone or in combination of two or more. It is preferable to use either or both of silica and acrylic beads.
• a filler By using a filler, blocking resistance can be improved. Further, for example, when the laminate of the present invention is stored at high temperatures, it is possible to prevent the heat seal layer from flowing out and reducing the film thickness.
• the shape of the filler is not particularly limited and can be selected as appropriate depending on the purpose, but it is less affected by deformation due to heat, and stable anti-blocking effects can be obtained regardless of the mode of dispersion in the coating film. Therefore, a spherical shape is preferable.
• the average particle diameter of the filler is appropriately adjusted depending on the filler used, and is, for example, 0.5 ⁇ m to 10 ⁇ m.
• the antifoaming agent is not particularly limited and can be selected as appropriate depending on the purpose, such as fatty acid salts, higher alcohol sulfates, liquid fatty oil sulfates, sulfates of aliphatic amines and aliphatic amides, fatty Group alcohol phosphate esters, sulfonates of dibasic fatty acid esters, fatty acid amide sulfonates, alkylaryl sulfonates, formalin condensed naphthalene sulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers , polyoxyethylene alkyl esters, sorbitan alkyl esters, polyoxyethylene sorbitan alkyl esters, acrylic polymers, silicone-mixed acrylic polymers, vinyl polymers, polysiloxane compounds, and the like.
• the method for applying the heat sealant is not particularly limited and can be selected as appropriate depending on the purpose, such as gravure coating, reverse coating, kiss coating, air knife coating, Mayer bar coating, and roll coating. , dip coating method, etc.
• the heat-sealing layer may be provided on the entire surface of the laminate, or may be provided only on the portion to be heat-sealed when producing the package.
• a heat sealing layer is formed by drying it.
• the drying temperature is 50° C. to 180° C., and the drying time is about 0.5 seconds to 1 minute.
• the drying method is not particularly limited, but an example is hot air drying. If necessary, a corona discharge treatment or the like may be performed as a post-treatment.
• the application amount (solid content) of the heat sealant is not particularly limited and can be appropriately selected depending on the purpose, for example, 1.0 g/m 2 to 15.0 g/m 2 and 2.0 g/m 2 to 15.0 g/m 2 . m 2 to 10.0 g/m 2 is preferable, and 2.0 g/m 2 to 8.0 g/m 2 is more preferable.
• an anchor coat layer may be provided under the heat seal layer.
• the anchor coat layer can use the same resin as the heat seal layer described above. Further, the anchor coat layer can be formed, for example, by applying a resin-containing coating liquid over the entire surface of the base layer.
• the average thickness of the anchor coat layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1 ⁇ m to 10 ⁇ m, more preferably 1 ⁇ m to 5 ⁇ m.
• the base material layer, heat seal layer, and other layers may contain antifogging agents, antistatic agents, heat stabilizers, nucleating agents, antioxidants, lubricants, antiblocking agents, mold release agents, Components such as ultraviolet absorbers, colorants, extrusion modifiers, etc. can be added within the range that does not impair the purpose of the present invention.
• the easily breakable film of the present invention includes a water vapor and/or oxygen barrier layer (hereinafter sometimes referred to as “barrier layer”), a printed layer, an OP varnish layer ("overprint varnish layer", “overcoat layer”), It may also have other layers ( ⁇ ) such as (also referred to as “top coat layer”).
• the other layer ( ⁇ ) is a water vapor and/or oxygen barrier layer, for example, in order to achieve the high storage stability required when the contained material is a pharmaceutical product. This is preferable because it can guarantee the quality.
• the other layer ( ⁇ ) may be a printed layer on which printing of a packaging film can be provided.
• the easily breakable film further has another layer ( ⁇ ) on the surface side of the base layer, and the easily breakable film is laminated in the order of ( ⁇ )/base material layer/heat seal layer; It may be an easily breakable film laminated in the order of /(A)/(B)/(C).
• the other layer ( ⁇ ) may be a single layer or may be a plurality of layers. The plurality of other layers ( ⁇ ) may have the same composition or different compositions.
• the other layer ( ⁇ ) is extruded together with the base layer and the heat seal layer to form ( ⁇ )/base layer/heat seal layer, or ( ⁇ )/(A)/(B)/(C).
• a coextrudable easily breakable film may be formed in which the other layer ( ⁇ ) and the base material layer/heat seal layer or (A)/(B)/(C) are laminated in this order.
• a laminated film may be formed by bonding the laminated easily breakable films in the order of ( ⁇ )/(A)/(B)/(C).
• another layer ( ⁇ ) may be provided by applying a coating agent or an ink composition.
• the adhesion method when laminating the other layer ( ⁇ ) is not particularly limited and can be appropriately selected depending on the purpose, and examples include dry lamination, wet lamination, non-solvent lamination, extrusion lamination, etc. .
• the other layer ( ⁇ ) is not particularly limited and can be selected as appropriate depending on the purpose, and for coextrusion, for example, olefin resin such as propylene resin, etc., and for laminate film.
• unoriented polyester CPET
• unoriented nylon CNY
• unoriented polypropylene CPP
• unoriented polyethylene CPE
• unoriented polystyrene CPS
• expanded polystyrene EPS
• biaxially oriented polyester OPET
• biaxially oriented polypropylene OPP
• EVOH ethylene vinyl alcohol copolymer
• coextrusion biaxially oriented polypropylene biaxially oriented ethylene vinyl alcohol copolymer
• EVOH coextrusion coated with polyvinylidene chloride
• PVDC polyvinylidene chloride
• Examples include biaxially oriented polypropylene and biaxially oriented nylon.
• the other layer ( ⁇ ) may be provided between the base material layer and the heat seal layer, or may be provided on both surfaces of the base material layer.
• the structure can be base material layer/( ⁇ )/heat seal layer or ( ⁇ )/base material layer/( ⁇ )/heat seal layer.
• the following configuration may be mentioned as a configuration in which a barrier layer, a printing layer, and an OP varnish layer are provided as other layers ( ⁇ ).
• the average thickness of the other layer ( ⁇ ) is not particularly limited and can be appropriately selected depending on the purpose.
• barrier layer Water vapor and/or oxygen barrier layer (barrier layer) -
• the method for forming the barrier layer include a method of laminating films having barrier properties, and a method of producing a coating layer by applying a barrier coating agent.
• the method of producing a coating layer coated with a barrier coating agent is preferred because it is simple.
• the barrier coating agents include, for example, polyvinyl alcohol (PVOH), ethylene vinyl alcohol (EVOH), polysaccharides, acrylic acid or methacrylic acid based polymers, starch or starch derivatives, cellulose nanofibers (CNF), nanocrystals.
• Coating agents containing polymers such as cellulose (NCC), chitosan, or other cellulose derivatives, hemicellulose, and polyvinylidene chloride (PVDC); coating agents that use at least one of the above coating agents in combination with an inorganic compound, etc. Can be mentioned.
• inorganic substances examples include silica, alumina, aluminum flakes, glass flakes, hydrated silicates (phyllosilicate minerals, etc.), kaolinite-serpentine clay minerals (halloysite, kaolinite, endellite, dickite, nacrite, etc.) , antigorite, chrysotile, etc.), pyrophyllite-talc group (pyrophyllite, talc, kerolite, etc.), smectite group clay minerals (montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite, stevensite, etc.), Vermiculite group clay minerals (vermiculite, etc.), mica or mica group clay minerals (mica such as muscovite, phlogopite, margarite, tetrasilylic mica, teniolite, etc.), chlorite group (cuckeiite, sudoite, clin
• the barrier coating agent is not particularly limited, and any known barrier coating agent can be used depending on the purpose.
• Examples of known barrier coating agents include the "Sunbar” series manufactured by Sun Chemical Co., Ltd., and the polyester barrier coating agent described in Japanese Patent No. 5,617,831.
• the barrier layer may be an inorganic vapor deposited layer that can be provided for the purpose of imparting gas barrier properties.
• the inorganic vapor deposition layer can be formed using an inorganic substance, an inorganic oxide, various metals, a metal oxide, a metal hydroxide, a metal salt, or the like.
• aluminum, alumina, silica, zinc oxide, magnesium oxide, calcium oxide, manganese oxide, iron oxide, cobalt oxide, nickel oxide, etc. may be used alone, or they may be used in combination, such as in binary vapor deposition of silica and alumina. More than one species can be used together.
• Two or more inorganic vapor deposited layers may be provided. When two or more inorganic vapor deposition layers are provided, they may have the same composition or different compositions. From the viewpoint of gas barrier properties, it is preferable to use aluminum.
• the inorganic vapor deposition layer can be provided on each of the above-mentioned layers or on a separate base material by a conventionally known method.
• methods for forming the inorganic vapor deposition layer include physical vapor deposition methods (PVD methods) such as vacuum evaporation methods, sputtering methods, and ion plating methods, plasma chemical vapor deposition methods, and thermal vapor deposition methods.
• PVD methods physical vapor deposition methods
• CVD methods chemical vapor deposition methods
• photochemical vapor deposition methods such as chemical vapor deposition methods and photochemical vapor deposition methods.
• the thickness of the inorganic vapor deposited layer is preferably 1 nm to 200 nm.
• the film thickness thereof is more preferably 1 nm to 100 nm, more preferably 15 nm to 60 nm, and even more preferably 10 nm to 40 nm.
• the film thickness is preferably 1 nm to 100 nm, more preferably 10 nm to 50 nm, and even more preferably 20 nm to 30 nm.
• the printing layer is a layer in which a desired pattern is formed using ink or the like in order to impart cosmetic properties, various information regarding the contained object, and functionality to the easily breakable film of the present invention, which is the printing material. be.
• the printing layer contains a binder resin and a colorant, and is formed by printing ink.
• the printed layer may be a single layer or may include a plurality of printed layers.
• the single layer may be a character printing layer on which characters or arbitrary objects are printed, or a solid printing layer. If there are multiple printing layers, it may be a solid printing layer or a printing layer in which a character printing layer is overprinted on top of a printing layer on which objects are printed, and the same ink is used for each printing layer. They may have the same composition but differ only in the coloring agent, or they may have different compositions.
• the ink is preferably a liquid printing ink used as a gravure printing ink or a flexographic printing ink.
• the liquid printing ink is broadly classified into organic solvent type liquid printing ink which uses an organic solvent as the main solvent, and aqueous liquid printing ink which uses water as the main solvent, but in the present invention, it does not matter which one is used. do not have. Further, there are so-called front printing ink and back printing ink which is intended for lamination, but either one may be used in the present invention.
• Binder resins used in the liquid printing ink include nitrified cotton, cellulose resins such as cellulose resins such as cellulose acetate propionate (CAP) and cellulose acetate butyronate (CAB), polyamide resins, and urethane resins.
• cellulose resins such as cellulose resins such as cellulose acetate propionate (CAP) and cellulose acetate butyronate (CAB)
• CAP cellulose acetate propionate
• CAB cellulose acetate butyronate
• polyamide resins such as urethane resins.
• acrylic resin vinyl chloride-vinyl acetate copolymer resin, chlorinated polypropylene resin, ethylene-vinyl acetate copolymer resin, vinyl acetate resin, vinyl chloride resin such as polyvinyl chloride resin, polyester resin, alkyd resin, rosin Examples include resins such as rosin-modified maleic acid resins, ketone resins, cyclized rubbers, chlorinated rubbers, butyral, petroleum resins, and the like.
• a curing agent may be used in combination with the binder resin.
• the curing agent any general-purpose curing agent for organic solvent-based gravure printing inks may be used, but isocyanate-based curing agents are most commonly used.
• the amount of the isocyanate compound added is preferably 0.3% by mass to 10.0% by mass, more preferably 1.0% by mass to 7.0% by mass, based on the solid content of the liquid printing ink from the viewpoint of curing efficiency.
• the binder resin is preferably 0.15% to 50% by weight, more preferably 1% to 40% by weight based on the liquid printing ink.
• the solvent used in the liquid printing ink is not particularly limited, but examples include water, toluene, xylene, aromatic hydrocarbon organic solvents such as Solvesso #100 and Solvesso #150, hexane, methylcyclohexane, heptane, and octane. , aliphatic hydrocarbon organic solvents such as decane, and various ester organic solvents such as methyl acetate, ethyl acetate, isopropyl acetate, n-propyl acetate, butyl acetate, amyl acetate, ethyl formate, and butyl propionate.
• water-miscible organic solvents include alcohols such as methanol, ethanol, propanol, butanol, and isopropyl alcohol, ketones such as acetone, methyl ethyl ketone, and cyclohaxanone, ethylene glycol (mono, di) methyl ether, and ethylene glycol (mono, di) ethyl.
• Ether ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, monobutyl ether, diethylene glycol (mono, di) methyl ether, diethylene glycol (mono, di) ethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, triethylene glycol (mono, di)
• Examples include various organic solvents of glycol ether type, such as di)methyl ether, propylene glycol (mono, di) methyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, and dipropylene glycol (mono, di) methyl ether. These may be used alone or in combination of two or more.
• the liquid printing ink contains a colorant and can be used as a liquid printing ink that contains a colorant and is used for design printing for the purpose of imparting cosmetic properties and the like.
• the colorant include inorganic pigments, organic pigments, and dyes used in general inks, paints, recording materials, etc., with pigments being preferred.
• organic pigments include soluble azo, insoluble azo, azo, phthalocyanine, halogenated phthalocyanine, anthraquinone, anthanthrone, dianthraquinonyl, anthrapyrimidine, perylene, perinone, quinacridone, Examples include thioindigo-based, dioxazine-based, isoindolinone-based, quinophthalone-based, azomethineazo-based, flavanthrone-based, diketopyrrolopyrrole-based, isoindoline-based, indanthrone-based, and carbon black-based pigments.
• Examples include lon blue, pyrimidine yellow, thioindigo bordeaux, thioindigo magenta, perylene red, perinone orange, isoindolinone yellow, aniline black, diketopyrrolopyrrole red, and daylight fluorescent pigments.
• both non-acid-treated pigments and acid-treated pigments can be used.
• inorganic pigments examples include white inorganic pigments such as titanium oxide, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, lithobon, antimony white, and gypsum.
• white inorganic pigments such as titanium oxide, zinc oxide, zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, lithobon, antimony white, and gypsum.
• titanium oxide is particularly preferred. Titanium oxide is white and is preferred from the viewpoint of coloring power, hiding power, chemical resistance, and weather resistance. From the viewpoint of printing performance, the titanium oxide is preferably treated with silica and/or alumina.
• inorganic pigments other than white examples include aluminum particles, mica (mica), bronze powder, chrome vermilion, yellow lead, cadmium yellow, cadmium red, ultramarine blue, deep blue, red iron oxide, yellow iron oxide, iron black, and zircon.
• Aluminum is in the form of powder or paste, but it is preferable to use it in paste form from the viewpoint of handling and safety, and whether to use leafing or non-leafing is selected as appropriate from the viewpoint of brightness and density.
• the content of the pigment is preferably an amount sufficient to ensure the concentration and coloring power of the liquid printing ink, that is, 1% by mass to 60% by mass based on the total mass of the liquid printing ink, and the content of the pigment is preferably 1% by mass to 60% by mass based on the total mass of the liquid printing ink.
• the weight ratio is preferably 10% by mass to 90% by mass. Further, these pigments can be used alone or in combination of two or more.
• the organic solvent-based liquid printing ink further contains wax, chelate crosslinking agent, extender pigment, leveling agent, antifoaming agent, plasticizer, infrared absorber, ultraviolet absorber, fragrance, flame retardant, etc. as necessary. You can also do that.
• liquid printing ink it is preferable to use a liquid printing ink using plant-derived raw materials in consideration of building a recycling-oriented society that should be sustainably developed (sustainability).
• plant-derived raw materials for example, cellulose resins such as cellulose acetate propionate resin and nitrified cotton, dimer acids or polymerized fatty acids derived from natural oils such as soybean oil, palm oil, and rice bran oil are used.
• Polyamide resins and polycarboxylic acids such as succinic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, dimer acid, glutaric acid, malic acid, etc.; polyols such as ethylene glycol, 1,2-propanediol, 1, 3-propanediol, 1,4-butanediol, neopentyl glycol, pentylene glycol, 1,10-dodecanediol, dimer diol, isosorbide, etc.
• polyisocyanates plants such as 1,5-pentamethylene diisocyanate, dimer diisocyanate, etc. Examples include biomass polyurethane synthesized from derived raw materials and rosin resin.
• UV cut ink- In the liquid printing ink used in the present invention, it is also preferable to use a UV cut ink that has an ultraviolet shielding effect.
• the UV cut ink is not particularly limited as long as it contains zinc oxide or the like and has a high ultraviolet shielding effect, and any commercially available UV cut ink can be used.
• the OP varnish layer is a coating for protecting the surface of the lid material from scratches and heat.
• OP varnishes include polyvinyl butyral resin; blends of epoxy resins and amino resins; cellulose resins such as nitrocotton resin, cellulose acetate, cellulose propionate, and cellulose butyrate; ethylene of phthalic acid, naphthalene dicarboxylic acid, and bisphenol A.
• EO oxide
• alicyclic skeletons such as cyclopentanediol and dimethyloltricyclodecane
• Aromatic isocyanate such as xylene diisocyanate and naphthalene diisocyan
• Urethane resin etc. can be used.
• polyisocyanate using the above-mentioned isocyanate may be used.
• compounds with a benzene ring and unsaturated double bonds such as styrene and phenoxydiethylene glycol acrylate; compounds with an alicyclic structure and unsaturated double bonds such as isobornyl acrylate and dicyclopentanyl acrylate; (meth) Radical copolymers such as acrylates can also be preferably used.
• the OP varnish layer preferably has heat resistance, and among the OP varnishes, a cellulose skeleton, a benzene ring skeleton, and an isocyanuric skeleton whose polymer has a glass transition temperature (hereinafter sometimes referred to as "Tg") of 100°C or higher are preferred. It is preferable to contain a resin having a polymer skeleton such as a ring skeleton or an alicyclic skeleton. Further, in consideration of adhesion to the olefin film, a resin having a low Tg may be used in combination.
• the OP varnish layer may further contain a coloring agent and be colored.
• the colorant is not particularly limited, and examples include inorganic pigments, organic pigments, and dyes used in general inks, such as those used in the above-mentioned printing layer.
• the OP varnish layer further contains inorganic fine particles as an aggregate, since this layer has excellent heat resistance.
• the inorganic fine particles include boron nitride, aluminum nitride, alumina, magnesia, titania, zirconia, zinc oxide, silicon oxide, silica (quartz, fumed silica, precipitated silica, silicic anhydride, fused silica, and crystalline silica). , ultrafine amorphous silica, etc.).
• boron nitride, aluminum nitride, alumina, titania, magnesia, zinc oxide, silicon oxide, etc. are preferable because they have excellent thermal conductivity.
• One type of inorganic fine particles may be used alone, or two or more types may be used in combination.
• the primary particle diameter of the inorganic fine particles is preferably 5 nm to 200 nm, more preferably 10 nm to 100 nm.
• the primary particle diameter is 5 nm or more, the inorganic fine particles in the dispersion are well dispersed, and when it is 200 nm or less, the strength of the cured product is good.
• the OP varnish layer contains wax, silicone additives, and organic beads in order to prevent damage to the coated film, prevent blocking during laminate formation, and provide workability during bag making after laminate formation. It can further include at least one of the following.
• the wax include amide wax, polypropylene wax, polyethylene wax, paraffin wax, carnauba wax, and rice wax.
• the silicone additive include ethylene oxide (EO) adducts of dimethylsiloxane, silicone-modified products, and the like.
• the organic beads include organic beads made of acrylic, nylon, urethane, or epoxy.
• the solvent used in the coating agent forming the OP varnish layer is not particularly limited, and the same solvents as those used in the printing ink can be used.
• the method for producing the easily breakable film of the present invention is not particularly limited, but for example, each resin or resin mixture used for each layer is heated and melted in separate extruders, and a coextrusion multilayer die method, a feed block method, etc.
• the surface resin layer (A) / inorganic substance-containing layer (B) / heat seal layer (C) or the surface resin layer (A) alone or the inorganic substance-containing layer (B) alone / heat seal layer (C) are formed in a molten state.
• a coextrusion method may be used in which the layers are formed into a film by inflation, T-die chill roll method, or the like.
• the coextrusion method is preferable because it allows the ratio of the thickness of each layer to be adjusted relatively freely, and a multilayer film with excellent hygiene and cost performance can be obtained.
• resins with a large difference in melting point and Tg are laminated, the appearance of the film may deteriorate during coextrusion processing, or it may become difficult to form a uniform layer structure.
• the T-die chill roll method which allows melt extrusion to be performed at a relatively high temperature, is preferred.
• a heat-sealing layer When forming a heat-sealing layer using the heat-sealing agent, after obtaining a laminate other than the heat-sealing layer, a surface resin layer (A) alone, or an inorganic substance-containing layer (B) alone, heat is applied by the above method.
• a heat-sealing layer may be provided by applying a sealing agent.
• the heat seal layer (C) is the other surface in order to improve adhesion with printing ink or adhesive. It is preferable to perform a surface treatment on the surface. Examples of such surface treatments include surface oxidation treatments such as corona treatment, plasma treatment, chromic acid treatment, flame treatment, hot air treatment, ozone/ultraviolet treatment, and surface roughening treatments such as sandblasting. Among these, corona treatment is preferred.
• the exposed surface on the heat seal layer (C) side may be subjected to surface treatment.
• the container (bottom material) is not particularly limited and can be appropriately selected from any known container depending on the purpose.
• a container made of resin is preferable, and even if it is a beverage container.
• a paper pack or a plastic cup that can be heat-sealed with the lid material of the straw opening.
• the resin is not particularly limited, and any known heat-sealable olefin resin can be appropriately selected depending on the purpose.
• the package of the present invention includes a lid material and a container having a concave portion, the lid material can be thermally bonded (heat-sealed) to the opening of the container, and the lid material and the container are heat-sealable. Accordingly, an object can be accommodated in the recess and sealed.
• a package such as a paper pack for beverages in which the lid material and the container are heat-sealed in advance
• the contents can be housed in the package and sealed.
• the method for producing the easily breakable film is not particularly limited, and any known method can be selected as appropriate depending on the purpose, and examples thereof include coextrusion, lamination, and the like.
• the base material layer (or the surface resin layer (A) and the inorganic substance-containing layer (B)), the heat seal layer (C ) is extruded so that each layer has a predetermined thickness, cooled with a water-cooled metal cooling roll (e.g. 40°C), subjected to corona discharge treatment if necessary, wound up on a roll, and placed in a ripening room (for example, a method of aging (for example, 24 hours) at 40° C.) can be mentioned.
• a water-cooled metal cooling roll e.g. 40°C
• the method for manufacturing the container having the recessed portion is not particularly limited, and any known method may be selected as appropriate depending on the purpose. Examples include a method of molding a container having a concave portion capable of accommodating an object from a sheet-like film using the method.
• the shape and number of the recesses in the package, and the sealing width or area between the lid material and the container vary depending on the shape and form of the object to be stored and cannot be unambiguously defined, but there are no particular limitations. It can be selected as appropriate depending on the intended application form.
• the method of heat sealing the lid material and the container there are no particular limitations on the method of heat sealing the lid material and the container, and any known method can be selected as appropriate depending on the purpose. , a method of applying the lid, degassing or replacing the air with an inert gas, and heat-sealing the abutting portion of the lid and the container.
• the heat sealing is not particularly limited and can be carried out using a known heat seal packaging machine as appropriate depending on the purpose.
• the molding heating temperature and molding time in the heat sealing are not particularly limited and can be appropriately selected depending on the purpose, for example, 80 ° C. to 180 ° C. and 0.1 seconds to 5.0 seconds. Can be mentioned.
• the easily breakable film 10 in this embodiment for example, as shown in FIG. This is an easily breakable film laminated in the order of (B)/(C).
• the easily breakable film 10 in another embodiment further has another layer ( ⁇ ) 4 on the surface resin layer (A) 1 side, and has ( ⁇ )/(A)/( It may be an easily breakable film laminated in the order of B)/(C).
• the other layer ( ⁇ ) 4 may be a single layer or may be a plurality of layers.
• FIG. 3 is a schematic cross-sectional view showing an example of the package according to this embodiment.
• the packaging body 100 is a packaging body that has a lid material 20 and a container 30 having a recessed part, and the contents 40 (for example, tablets, etc.) can be individually accommodated in a plurality of independent recessed parts, and each of the contents can be extracted by extrusion.
• the lid material 20 is an easily breakable film 10
• the heat seal layer (C) 3 of the easily breakable film 10 is heat sealed to the container 30.
• cyclic olefin resin (a) As the resin for the surface resin layer (layer A), a ring-opening polymer of norbornene monomer (hereinafter referred to as "cyclic olefin resin (a)"). MVR: 4 cm 3 /10 minutes (260 ° C., 2.16 kg), density: 1.02 g/cm 3 , glass transition temperature: 158°C), and a ring-opening polymer of norbornene monomer (hereinafter referred to as "cyclic olefin resin (b)”). MVR: 12 cm 3 /10 min (230°C , 2.16 kg), density: 1.02 g/cm 3 , glass transition temperature: 78°C).
• resin for the inorganic substance-containing layer 50 parts by mass of the same cyclic olefin resin (a) as layer A, 30 parts by mass of cyclic olefin resin (b), and 20 parts by mass of a masterbatch containing 40% by mass of talc as an inorganic substance. section was used.
• resin for the heat seal layer C layer
• polypropylene hereinafter referred to as "propylene resin (a)
• MFR 6 g/10 minutes (230 ° C., 21.18 N)
• density 0.89 g/cm 3
• a container bottom material
• a container having an independent recess for storing tablets was used by vacuum-pressure forming a molded resin sheet.
• the heat-sealing layer (C layer) of the easily breakable film 1 is attached to the bottom material with double-sided tape so that it is in contact with the container, and the package 1 of Example 1 is I got it.
• evaluation criteria ⁇ : Contents could be taken out without getting caught in the torn lid with the same extrusion force as commercially available aluminum foil-based PTP (good opening)
• ⁇ Either the extrusion force was large or there was something caught, but the contents could be taken out (can be opened)
• ⁇ The extrusion force was large and there was a catch, so the contents could not be easily taken out (difficult to open)
• Example 2 to 6 In Example 1, as described in Table 1, the resin composition and extrusion conditions by coextrusion method were changed, and the thickness of each layer (A)/(B)/(C) was changed. In the same manner as in Example 1, easily breakable films 2 to 6 for lid materials of Examples 2 to 6 and packages 2 to 6 were produced and evaluated. Note that Examples and Comparative Examples in which the column for the resin composition of the inorganic material-containing layer (B) is blank do not include the inorganic material-containing layer (B) and have a layer structure of (A)/(C).
• Example 1 In Example 1, as shown in Table 2, the resin composition and extrusion conditions by coextrusion method were changed to change the thickness of each layer (A)/(B)/(C). In the same manner as in Example 1, easily breakable films a to f for lid materials and packages a to f of Comparative Examples 1 to 6 were produced and evaluated.
• "propylene resin (b)” is polypropylene having an MFR of 2.5 g/10 minutes (230° C., 21.18 N) and a density of 0.90 g/cm 3 . Note that Examples and Comparative Examples in which the column for the resin composition of the inorganic material-containing layer (B) is blank do not include the inorganic material-containing layer (B) and have a layer structure of (A)/(C).

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• 2023
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