Classifications

• • 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
  • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• • 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
  • 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
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes

Definitions

• PTPs press-through packs
• Polyvinyl chloride resin has primarily been used as the plastic sheet due to its transparency, formability, rigidity, and cost.
• polyvinyl chloride resin has poor moisture-proofing properties. Therefore, this has been addressed by coating polyvinylidene chloride resin, which has excellent moisture-proofing properties, on polyvinyl chloride resin sheets.
• these are expensive and pose a cost problem.
• a laminated film comprising a functional layer and a sealant layer as one of the outermost layers, wherein the functional layer contains a flake-like filler and a cyclic olefin copolymer, and the sealant layer contains a polypropylene-based resin.
• the sealant layer further contains a cyclic olefin copolymer.
• the functional layer further contains a pigment.
• the pigment is titanium oxide.
• the present invention provides a laminated film that is moisture-proof, low-cost, and easy to process, as well as excellent sealing and impact resistance, and a package using the laminated film.
• FIG. 1 is a cross-sectional view schematically illustrating an example of a laminated film according to one embodiment of the present invention.
• 1 is a perspective view schematically illustrating an example of a packaging body according to an embodiment of the present invention.
• 3 is a cross-sectional view of the package shown in FIG. 2 taken along line II.
• a laminated film according to one embodiment of the present invention is a laminated film comprising a functional layer and a sealant layer as one of the outermost layers, wherein the functional layer contains a plate-like filler and a cyclic olefin copolymer, and the sealant layer contains a polypropylene-based resin.
• Figure 1 is a cross-sectional view schematically showing an example of a laminated film according to this embodiment.
• the laminated film of this embodiment includes a sealant layer (for example, the sealant layer 11 in the laminated film 1 shown in FIG. 1).
• a sealant layer for example, the sealant layer 11 in the laminated film 1 shown in FIG. 1.
• the sealant layer is one of the outermost layers in the laminated film, and is disposed on one of the outermost layers in the lamination direction of the layers constituting the laminated film.
• a package can be constructed by sealing the laminated film to another film or sheet via the sealant layer therein.
• the exposed surface of the sealant layer (the surface opposite to the functional layer) is the sealing surface for heat sealing to another film or sheet.
• the sealant layer preferably has transparency.
• the sealant layer contains a polypropylene-based resin.
• the sealant layer can have improved sealing properties and impact resistance.
• the sealant layer may be a non-easy peel type sealant layer (complete seal type sealant layer) or an easy peel type sealant layer (easy peel layer), but is preferably a non-easy peel type sealant layer (complete seal type sealant layer).
• the polypropylene-based resin contained in the sealant layer is not particularly limited as long as it has structural units derived from propylene, and may be a propylene homopolymer or a propylene-based copolymer having structural units derived from propylene and structural units derived from a monomer other than propylene.
• An example of a homopolymer of propylene is polypropylene (homopolypropylene, hPP).
• Propylene-based copolymers have structural units derived from propylene and structural units derived from monomers other than propylene. However, among olefin copolymers having structural units derived from propylene and structural units derived from ethylene, copolymers in which the number of structural units derived from ethylene is greater than the number of structural units derived from propylene are classified as ethylene-based copolymers.
• propylene-based copolymers examples include propylene-ethylene random copolymers (also known as polypropylene random copolymers (rPP)), propylene-ethylene block copolymers (also known as polypropylene block copolymers (bPP)), and ethylene-propylene terpolymers (also known as ethylene propylene terpolymers, EPT).
• propylene-ethylene random copolymers also known as polypropylene random copolymers (rPP)
• propylene-ethylene block copolymers also known as polypropylene block copolymers (bPP)
• ethylene-propylene terpolymers also known as ethylene propylene terpolymers, EPT.
• the sealant layer may contain only one type of polypropylene resin, or two or more types. If two or more types are used, the combination and ratio of these resins can be selected as desired depending on the purpose.
• the ratio of the content (parts by mass) of the polypropylene-based resin to the total mass (parts by mass) of the sealant layer is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more, and may be, for example, 40% by mass or more or 50% by mass or more.
• the ratio is equal to or more than the lower limit, the sealing properties and impact resistance of the sealant layer can be further improved.
• the proportion is 90% by mass or less.
• the ratio is usually the same as the ratio of the content (parts by mass) of the polypropylene-based resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer, which will be described later ([content (parts by mass) of the polypropylene-based resin in the resin composition for forming a sealant layer])/[total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a sealant layer] ⁇ 100).
• room temperature means a temperature that is neither particularly cold nor hot, i.e., a normal temperature, such as a temperature between 15 and 25°C.
• the cyclic olefin copolymer is preferably a copolymer of a cyclic olefin monomer and an olefin other than the cyclic olefin monomer.
• the ratio of the cyclic olefin monomer in the cyclic olefin copolymer is preferably 50% by mass or more and 80% by mass or less, and more preferably 60% by mass or more and 70% by mass or less.
• the cyclic olefin monomer may be one or more selected from the group consisting of norbornene, derivatives of norbornene, an addition reaction product of dicyclopentadiene and ethylene, and an addition reaction product of a derivative of dicyclopentadiene and ethylene.
• the olefin may be one or more selected from the group consisting of ethylene, propylene, and butadiene.
• the cyclic olefin copolymer may be a copolymer of an addition reaction product of dicyclopentadiene or a derivative thereof with ethylene and one or more unsaturated monomers selected from ethylene, butadiene, or styrene derivatives, or a hydrogenated product thereof.
• the glass transition temperature of the cyclic olefin copolymer is preferably 140°C or lower, more preferably 100°C or lower, and even more preferably 90°C or lower. Having a glass transition temperature within this range further reduces dimensional variation in packaging constructed using the laminated film, further improving the barrier properties of the packaging.
• MFR refers to a value measured in accordance with JIS K 6922-1.
• the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total mass (parts by mass) of the sealant layer is preferably 10% by mass or more, more preferably 20% by mass or more, and even more preferably 30% by mass or more, and may be, for example, any one of 40% by mass or more and 50% by mass or more.
• the ratio is equal to or more than the lower limit, the moisture resistance of the sealant layer can be further improved.
• polypropylene-based resin or the polypropylene-based resin and the cyclic olefin copolymer, and components other than these (sometimes referred to herein as "other components") (i.e., it may consist of the polypropylene-based resin and the other components, or the polypropylene-based resin, the cyclic olefin copolymer, and the other components).
• non-resin components examples include additives known in the art.
• additives include pigments, antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.
• the sealant layer may consist of one layer (single layer), or two or more layers. When the sealant layer consists of multiple layers, these layers may be the same or different, and there are no particular restrictions on the combination of these layers as long as it does not impair the effects of the present invention.
• the laminate film of this embodiment includes a functional layer (for example, functional layer 12 in the laminate film 1 shown in FIG. 1).
• a functional layer for example, functional layer 12 in the laminate film 1 shown in FIG. 1.
• the functional layer is disposed between the sealant layer and the outer layer in the laminate film.
• the functional layer preferably has transparency.
• the plate-like filler is preferably arranged in a direction parallel to the surface of the functional layer.
• Examples of the cyclic olefin copolymer contained in the functional layer include the same cyclic olefin copolymers as those contained in the sealant layer described above.
• the cyclic olefin copolymer contained in the functional layer and the cyclic olefin copolymer contained in the sealant layer may be the same as or different from each other.
• the ratio is usually the same as the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a functional layer, which will be described later ([content (parts by mass) of the cyclic olefin copolymer in the resin composition for forming a functional layer]) / [total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming a functional layer] ⁇ 100).
• the functional layer may, for example, contain only the plate-like filler and the cyclic olefin copolymer (i.e., it may consist of the plate-like filler and the cyclic olefin copolymer). Alternatively, it may contain the plate-like filler and the cyclic olefin copolymer, as well as components other than these (sometimes referred to as "other components" in this specification) (i.e., it may consist of the plate-like filler, the cyclic olefin copolymer, and the other components).
• the other components that the functional layer may contain are not particularly limited and can be selected arbitrarily depending on the purpose.
• they may be either resin components (sometimes referred to as “other resin components” in this specification) or non-resin components (sometimes referred to as “other non-resin components” in this specification).
• the other resin component is not particularly limited, as long as it is a resin component other than the cyclic olefin copolymer.
• the other non-resin components are not particularly limited as long as they are non-resin components other than the flake-like filler, and examples thereof include additives known in the art.
• the additives include pigments, antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, thickeners, heat stabilizers, lubricants, infrared absorbers, ultraviolet absorbers, etc. Of these, pigments are preferred.
• the pigment contained in the functional layer is a component used to adjust the color of the functional layer.
• the functional layer may turn light brown, which could lead to children mistaking the laminated film for confectionery or the like. Therefore, if the functional layer also contains a white pigment such as titanium oxide, the color of the functional layer will be white, preventing children from mistaking it for confectionery or the like.
• the pigment contained in the functional layer may be a known pigment.
• pigments include titanium oxide, zinc oxide, and white lead. Of these, as mentioned above, titanium oxide is preferred from the viewpoint of making the functional layer white.
• the ratio of the pigment content to the total mass of the functional layer is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 8% by mass or less, and even more preferably 1% by mass or more and 6% by mass or less.
• the functional layer may contain only one type of other component, or two or more types. If there are two or more types, the combination and ratio of these components can be selected as desired depending on the purpose.
• the thickness of the functional layer is preferably 150 ⁇ m or more and 450 ⁇ m or less, more preferably 200 ⁇ m or more and 400 ⁇ m or less, and even more preferably 250 ⁇ m or more and 350 ⁇ m or less.
• thickness is equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved.
• the thickness is equal to or less than the upper limit, the functional layer is further prevented from becoming excessively thick.
• thickness of functional layer means the thickness of the entire functional layer; for example, the thickness of a functional layer consisting of multiple layers means the total thickness of all layers that make up the functional layer.
• the ratio of the thickness of the functional layer to the thickness of the laminated film is preferably 50% or more and 99% or less, more preferably 60% or more and 97% or less, and even more preferably 70% or more and 95% or less.
• the ratio is equal to or greater than the lower limit, the moisture resistance of the functional layer can be further improved.
• the ratio is equal to or less than the upper limit, the functional layer can be further prevented from becoming excessively thick.
• the laminated film of this embodiment preferably includes an outer layer (outer layer 13 in the laminated film 1 shown in FIG. 1).
• an outer layer By providing the laminated film with an outer layer, the moisture resistance and impact resistance of the laminated film or a package constructed using the same can be further improved.
• the outer layer is disposed on the side of the functional layer opposite to the sealant layer side.
• the outer layer is preferably the other outermost layer, and is preferably disposed on the other outermost side opposite the sealant layer side in the stacking direction of the layers constituting the laminated film.
• the surface of the outer layer opposite the sealant layer side is preferably the exposed surface of the multilayer film.
• the outer layer is preferably transparent.
• the outer layer may contain a polypropylene-based resin.
• the polypropylene-based resin contained in the outer layer include the same polypropylene-based resins as those contained in the sealant layer described above.
• the polypropylene resin contained in the outer layer and the polypropylene resin contained in the sealant layer may be the same as or different from each other.
• the ratio of the content (parts by mass) of the polypropylene-based resin to the total mass (parts by mass) of the outer layer is preferably 1% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, and may be, for example, 30% by mass or more or 40% by mass or more.
• the ratio is equal to or more than the lower limit, the impact resistance of the outer layer can be further improved.
• the proportion is 99% by mass or less.
• the ratio is usually the same as the ratio of the content (parts by mass) of the polypropylene-based resin to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming an outer layer, which will be described later ([content (parts by mass) of the polypropylene-based resin in the resin composition for forming an outer layer])/[total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming an outer layer] ⁇ 100).
• the outer layer may further include a cyclic olefin copolymer.
• a cyclic olefin copolymer examples include the same cyclic olefin copolymers as those contained in the sealant layer described above.
• the cyclic olefin copolymer contained in the outer layer and the cyclic olefin copolymer contained in the sealant layer may be the same as or different from each other.
• the ratio of the content (parts by mass) of the cyclic olefin copolymer in the outer layer to the total mass (parts by mass) of the outer layer is preferably 1% by mass or more, more preferably 10% by mass or more, and even more preferably 20% by mass or more, and may be, for example, any one of 30% by mass or more and 40% by mass or more.
• the ratio is equal to or more than the lower limit, the moisture resistance of the outer layer can be further improved.
• the proportion is 99% by mass or less.
• the ratio is usually the same as the ratio of the content (parts by mass) of the cyclic olefin copolymer to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming an outer layer, which will be described later ([content (parts by mass) of the cyclic olefin copolymer in the resin composition for forming an outer layer])/[total content (parts by mass) of components that do not vaporize at room temperature in the resin composition for forming an outer layer] ⁇ 100).
• the outer layer may contain, for example, only the polypropylene-based resin, or only the polypropylene-based resin and the cyclic olefin copolymer (i.e., it may consist of the polypropylene-based resin, or the polypropylene-based resin and the cyclic olefin copolymer).
• polypropylene-based resin or the polypropylene-based resin and the cyclic olefin copolymer, and components other than these (sometimes referred to herein as "other components") (i.e., it may consist of the polypropylene-based resin and the other components, or the polypropylene-based resin, the cyclic olefin copolymer, and the other components).
• the other components contained in the outer layer include the same components as those contained in the sealant layer described above.
• the outer layer may consist of one layer (single layer), or two or more layers. If the outer layer consists of multiple layers, these layers may be the same or different, and there are no particular restrictions on the combination of these layers as long as it does not impair the effects of the present invention.
• multiple layers may be the same or different
• all layers may be the same, all layers may be different, or only some layers may be the same
• multiple layers are different means "at least one of the constituent materials and thicknesses of each layer is different from each other.”
• the thickness of the outer layer is preferably 1 ⁇ m or more and 50 ⁇ m or less, more preferably 5 ⁇ m or more and 45 ⁇ m or less, and even more preferably 10 ⁇ m or more and 40 ⁇ m or less.
• the thickness is equal to or greater than the lower limit, the moisture resistance and impact resistance of the outer layer can be further improved.
• the thickness is equal to or less than the upper limit, the outer layer is further prevented from becoming excessively thick.
• the "thickness of the outer layer” means the thickness of the entire outer layer, and for example, the thickness of an outer layer consisting of multiple layers means the total thickness of all layers that make up the outer layer.
• the laminated film may have other layers that do not fall under any of the sealant layer, functional layer, and outer layer, as long as the effects of the present invention are not impaired.
• the type, number and position of the other layer included in the laminated film are not particularly limited and can be selected as desired depending on the purpose.
• the other layer provided in the laminated film may be of only one type, or of two or more types, and when there are two or more types, the combination and ratio thereof can be selected arbitrarily depending on the purpose.
• the other layers may consist of one layer (single layer) per type, or two or more layers.
• these multiple layers may be the same or different, and there are no particular restrictions on the combination of these multiple layers as long as it does not impair the effects of the present invention.
• the thickness of the other layers can be set arbitrarily depending on their type and is not particularly limited.
• the laminated film includes the other layer, it may further include an adhesive layer for adhering the other layer to other layers.
• the laminated film contains a plate-like filler, a cyclic olefin copolymer, a polypropylene-based resin, and the like, and therefore is superior in cost reduction and ease of processing compared to films containing halogen-based materials such as chlorine and fluorine.
• the thickness of the laminated film is preferably 150 ⁇ m or more and 450 ⁇ m or less, more preferably 200 ⁇ m or more and 400 ⁇ m or less, and even more preferably 250 ⁇ m or more and 350 ⁇ m or less.
• the thickness of the laminate film is equal to or greater than the lower limit, the moisture resistance, sealing property, and impact resistance of the laminate film can be further improved.
• the thickness of the laminate film is equal to or less than the upper limit, the tablet storage section of the package can be more easily formed.
• the laminated film is suitable as a laminated film for blister pack packaging.
• the sheet moisture permeability of the laminated film is preferably 0.27 g/ m2 ⁇ day or less, more preferably 0.25 g/ m2 ⁇ day or less, and even more preferably 0.23 g/ m2 ⁇ day or less.
• the sheet moisture permeability of the laminated film is 0 g/m 2 ⁇ day or more. That is, the oxygen permeability of the laminated film may be any one of 0 to 0.27 g/m 2 ⁇ day, 0 to 0.25 g/m 2 ⁇ day, and 0 to 0.23 g/m 2 ⁇ day.
• the tablet removal load of the package can be obtained, for example, by pressing the tip of the tablet storage section of the package vertically with a pressing pin and measuring the maximum load applied until the tablet storage section is fully pressed in, as in the example described below.
• the laminated film can also be produced by separately preparing two or more films for constituting any two or more of the layers, laminating these films together using an adhesive by any of dry lamination, extrusion lamination, hot melt lamination, and wet lamination, and then laminating other layers as needed to form the desired arrangement.
• the adhesive used may be one capable of forming the adhesive layer.
• a laminate film having an outer layer may be produced by laminating a laminate film having a sealant layer and an outer layer or a laminate film having an outer layer by any of the methods described above. In this case, the outer layer before lamination may be biaxially stretched as necessary.
• the package 10 shown in FIG. 2 can be produced using a known PTP packaging machine. More specifically, first, protrusions are formed on the laminated film 1 by vacuum forming, pressure forming, plug forming, or the like, to produce the formed film 2 . Next, after the tablets 102 to be stored are filled into the protruding portion 2c of the molding film 2, the cover film 101 is superimposed on the laminated film 1, and the molding film 2 and the cover film 101 are adhered to each other. Next, if necessary, slits 10b are formed in the molded film 2 and the cover film 101 using a perforation blade or a half-cut blade. In this way, the package 10 is obtained.
• Example 1 ⁇ Laminated film manufacturing>> A laminated film having the structure shown in FIG. 1 was produced according to the following procedure.
• Zeolite ( ⁇ 7.0 mm x 3.0 mm) was filled into each of the 10 tablet storage compartments of the first test piece, and the openings of the tablet storage compartments were sealed with an aluminum cover film to obtain a second test piece.
• the second test piece was left in an atmosphere of 40°C and 90% RH for 24 hours, after which the change in weight of the zeolite was measured.
• the amount of water vapor transmitted through the tablet storage compartment of the second test piece was obtained from this weight change, and the pocket moisture permeability was evaluated.
• ⁇ Molding temperature range> The moldability of packages containing the films produced in the Examples and Comparative Examples was evaluated. Specifically, for each of the films in the Examples and Comparative Examples, a total of 10 storage compartments ( ⁇ 10.0 mm ⁇ 4.5 mm) were formed using a PTP packaging machine (CKD Corporation's "FBP-300E"), with five storage compartments along the longitudinal direction and two storage compartments along the lateral direction. The criteria for determining whether or not the film could be molded were that the pocket thickness (thinnest layer) of the film was 80 ⁇ m or more, the pocket was free of whitening (a phenomenon in which the pocket side portions are forcibly stretched and become partially white), and the pocket height was 4.5 mm or more. The molding temperature range that satisfied these criteria was measured as the moldable temperature range.
• a resin composition for forming a resin film was produced by mixing the COC (70 parts by mass) and the TL (30 parts by mass).

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• 2025
  • 2025-02-05 WO PCT/JP2025/003760 patent/WO2025169957A1/ja active Pending
  • 2025-02-05 JP JP2025545020A patent/JPWO2025169957A1/ja active Pending

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