WO2020008893A1 - Film en couches et couvercle - Google Patents

Film en couches et couvercle Download PDF

Info

Publication number
WO2020008893A1
WO2020008893A1 PCT/JP2019/024457 JP2019024457W WO2020008893A1 WO 2020008893 A1 WO2020008893 A1 WO 2020008893A1 JP 2019024457 W JP2019024457 W JP 2019024457W WO 2020008893 A1 WO2020008893 A1 WO 2020008893A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
ethylene
base layer
laminated film
sec
Prior art date
Application number
PCT/JP2019/024457
Other languages
English (en)
Japanese (ja)
Inventor
桂輔 浜崎
智久 木田
古根村　陽之介
森谷　貴史
Original Assignee
Dic株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dic株式会社 filed Critical Dic株式会社
Priority to KR1020207035751A priority Critical patent/KR20210027260A/ko
Priority to JP2019554951A priority patent/JP6624358B1/ja
Publication of WO2020008893A1 publication Critical patent/WO2020008893A1/fr

Links

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
    • B32B27/32—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

  • the present invention relates to a laminated film having good adhesiveness to an adherend such as a heat seal portion of a packaging container, and capable of realizing easy-openability that can be suitably peeled.
  • Patent Document 1 describes a lid material in which a base film is bonded to a laminated film having a heat seal layer and a surface layer as an easily-openable lid material.
  • This lid material suppresses resin flow in the heat seal layer by using a resin with lower fluidity than the conventional resin for the surface layer laminated on the heat seal layer, and is excellent regardless of the sealing temperature. It is easy to open.
  • the sealing temperature may be increased in order to suppress the occurrence of sealing failure due to biting of the contents, etc.
  • the adhesive strength is also increased, and as a result, the opening strength is increased, and there is a problem that the easy opening property is not exhibited.
  • the problem to be solved by the present invention is to have good adhesion to a smooth surface to be bonded and a surface to be bonded having an uneven shape, to be able to form a good film, and to be easily peelable.
  • An object of the present invention is to provide a laminated film capable of realizing openability.
  • the present inventors have conducted intensive studies to solve such problems, and as a result, in a specific shear rate region, a polyolefin resin having a specific melt viscosity can be used for the base layer of the laminated film to solve the problems. And completed the present invention.
  • the present invention relates to a laminated film having a base layer (A) and a heat seal layer (B), wherein the viscosity of the base layer (A) at a shear rate of 6 [sec ⁇ 1 ] is 1.4 ⁇ 10 3 [
  • the present invention provides a laminated film containing an ethylene resin (a1) having a viscosity of not less than Pa ⁇ s] and not more than 1.0 ⁇ 10 3 [Pa ⁇ s] at a shear rate of 120 [sec ⁇ 1 ].
  • the laminated film of the present invention can be easily opened even if the sealing temperature is increased, in order to suppress the occurrence of sealing failure due to biting of the contents, etc., so that the laminated film is preferably used as a lid material of a packaging container. Can be.
  • the laminated film of the present invention is a laminated film having a base layer (A) and a heat seal layer (B).
  • the base layer (A) contains an ethylene-based resin as a main resin component, and forms the base layer (A).
  • the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] of the resin composition is 1.4 ⁇ 10 3 [Pa ⁇ s] or more, and the resin composition at a shear rate of 120 [sec ⁇ 1 ] is used.
  • It is a laminated film having a melt viscosity at 270 ° C. of 1.0 ⁇ 10 3 [Pa ⁇ s] or less.
  • the base layer (A) in the laminated film of the present invention has a melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] of at least 1.4 ⁇ 10 3 [Pa ⁇ s] and a shear rate of 120 [sec ⁇ ].
  • 1 ) is a layer formed from a resin composition having a melt viscosity at 270 ° C. of 1.0 ⁇ 10 3 [Pa ⁇ s] or less.
  • the viscosity of the resin composition used for the base layer (A) in the low shear rate region (6 [sec ⁇ 1 ]) is set to 1.4 ⁇ 10 3 [Pa ⁇ s] or more, whereby the heat Outflow of the resin at the time of sealing can be suitably suppressed, and suitable adhesiveness and easy opening property can be realized.
  • the viscosity of the resin composition in a high shear rate region (120 [sec ⁇ 1 ]) to 1.0 ⁇ 10 3 [Pa ⁇ s] or less, favorable fluidity can be realized at the time of production, and good. Film formation becomes possible.
  • the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is preferably 1.5 ⁇ 10 3 [Pa ⁇ s] or more, more preferably 1.7 ⁇ 10 3 [Pa ⁇ s] or more. is there.
  • the upper limit of the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is not particularly limited, but is preferably 6.0 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 4.0 ⁇ 10 3 [Pa ⁇ s]. s]. Further, the melt viscosity at 270 ° C.
  • melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] is not particularly limited, but is preferably 3.0 ⁇ 10 2 [Pa ⁇ s] or more, more preferably 4.0 ⁇ 10 2 [Pa ⁇ s]. s].
  • the base layer (A) contains an ethylene resin as a main resin component.
  • the ethylene resin include polyethylene resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), and ethylene-vinyl acetate copolymer. , Ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, etc., among which linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium Ethylene resins such as high density polyethylene (MDPE) and high density polyethylene (HDPE) are preferred.
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • the resin composition forming the base layer (A) preferably has a melt flow rate (190 ° C., 21.18 N) of 0.10 to 0.80 [g / 10 min], and 0.20 to 0.70. [G / 10 min] is more preferable.
  • the content of the ethylene resin in the resin component contained in the base layer (A) is preferably 80% by mass or more, and more preferably 90% by mass or more. It is also preferable that the resin component contained in the base layer (A) is composed of only an ethylene-based resin. When the content of the ethylene-based resin is in the above range, the easy-opening property can be easily adjusted.
  • the resin other than the ethylene-based resin examples include a polyolefin-based resin other than the above-mentioned ethylene-based resin, and the like.
  • examples thereof include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-butene-1 copolymer, and a propylene-ethylene-
  • propylene-based resins such as butene-1 copolymer and metallocene catalyst-based polypropylene.
  • the content is preferably 20% by mass or less, more preferably 10% by mass or less, of the resin component contained in the base layer (A). If it exceeds this range, the material strength of the base layer (A) decreases, so that the base layer (A) undergoes cohesive failure at the time of opening or the like, and a suitable easy-openability cannot be obtained.
  • additives may be blended in the base layer (A) as long as the effects of the present invention are not impaired.
  • the additive include an antioxidant, a weather stabilizer, an antistatic agent, an antifogging agent, an antiblocking agent, a lubricant, a nucleating agent, and a pigment.
  • the above-mentioned ethylene-based resin can be preferably used.
  • the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is 3.0 ⁇ 10 3 [Pa] [S]
  • an ethylene resin (a1) having a melt viscosity at 270 ° C. at a shear rate of 120 [sec-1] of 1.4 ⁇ 10 3 [Pa ⁇ s] or less is preferably used.
  • the ethylene resin (a1) has a density of 0.940 to 0.970 [g / cm 3 ] and a melt flow rate (190 ° C., 21.18 N) of 0.10 to 0.70 [g / cm 3 ]. 10 min].
  • the melt viscosity of the ethylene-based resin (a1) at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is preferably 3.0 ⁇ 10 3 [Pa ⁇ s] or more, and more preferably 3.3 ⁇ 10 3 [Pa ⁇ s]. .S] or more, and more preferably 3.6 ⁇ 10 3 [Pa ⁇ s] or more.
  • the upper limit of the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is not particularly limited, but is preferably 6.0 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 4.0 ⁇ 10 3 [Pa ⁇ s]. s].
  • the melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] is preferably 1.4 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 1.3 ⁇ 10 3 [Pa ⁇ s] or less. is there.
  • the lower limit of the melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] is not particularly limited, but is preferably 8.0 ⁇ 10 2 [Pa ⁇ s] or more, more preferably 9.0 ⁇ 10 2 [Pa ⁇ s]. s].
  • the ethylene-based resin (a1) is not particularly limited.
  • polyethylene resins such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE)
  • LLDPE linear low-density polyethylene
  • MDPE medium-density polyethylene
  • HDPE high-density polyethylene
  • polyethylene resins such as linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE) are preferred because of their high heat resistance, and high-density polyethylene (HDPE) is preferred. Particularly preferred.
  • the ethylene resin (a1) preferably has a melt flow rate (190 ° C., 21.18 N) of 0.10 to 0.70 [g / 10 min], and more preferably 0.20 to 0.50 [g / 10 min]. Is more preferable. Use of the ethylene resin (a1) having a melt flow rate in the above range facilitates the easy opening property.
  • the content of the ethylene resin (a1) in the base layer (A) is preferably from 20 to 60% by mass, more preferably from 30 to 50% by mass.
  • the content of the ethylene-based resin (a1) is preferably from 20 to 60% by mass, more preferably from 30 to 50% by mass.
  • the density of the ethylene resin (a1) is preferably 0.940 to 0.970 [g / cm 3 ], and more preferably 0.940 to 0.960 [g / cm 3 ].
  • the base layer (A) has a melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] of 2.3 ⁇ 10 3 [Pa ⁇ s] or more as a resin other than the ethylene resin (a1), and It is also preferable to use an ethylene resin (a2) having a melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] of 1.2 ⁇ 10 3 [Pa ⁇ s] or less.
  • the ethylene resin (a2) has a density of 0.920 to 0.940 [g / cm 3 ] and a melt flow rate (190 ° C., 21.18 N) of 0.10 to 1.0 [g / cm 3 ]. 10 min].
  • the melt viscosity of the ethylene-based resin (a2) at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is preferably 2.3 ⁇ 10 3 [Pa ⁇ s] or more, more preferably 2.4 ⁇ 10 3 [Pa ⁇ s]. Pa ⁇ s] or more.
  • the upper limit of the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is not particularly limited, but is preferably 4.5 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 4.0 ⁇ 10 3 [Pa ⁇ s]. s].
  • the viscosity and the melt flow rate of the resin composition forming the base layer (A) can be within the above ranges, even lower ones can be preferably used, and 8.0 ⁇ 10 2 [Pa ⁇ s] or less. It is also preferable that it is 7.0 ⁇ 10 2 [Pa ⁇ s] or less.
  • the melt viscosity of the base layer (A) can be easily adjusted to the above range.
  • the ethylene resin (a2) is not particularly limited, and examples thereof include polyethylene resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE). Among them, low-density polyethylene (LDPE) is preferable in that the film formability is improved.
  • LLDPE linear low density polyethylene
  • LDPE low density polyethylene
  • MDPE medium density polyethylene
  • HDPE high density polyethylene
  • LDPE low-density polyethylene
  • the ethylene resin (a2) preferably has a melt flow rate (190 ° C., 21.18 N) of 0.10 to 1.0 [g / 10 min], and more preferably 0.20 to 0.70 [g / 10 min]. Is more preferable. Use of the ethylene resin (a2) having a melt flow rate within the above range facilitates easy opening.
  • the content of the ethylene resin (a2) in the base layer (A) is preferably from 20 to 60% by mass, more preferably from 25 to 50% by mass.
  • the content of the ethylene-based resin (a2) is preferably from 20 to 60% by mass, more preferably from 25 to 50% by mass.
  • the density of the ethylene-based resin (a2) is preferably 0.920 to 0.940 [g / cm 3 ], and more preferably 0.920 to 0.930 [g / cm 3 ].
  • the use of the ethylene resin (a2) having a density within the above range is preferable in that easy opening property is exhibited.
  • the base layer (A) has a melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] of 1.0 ⁇ 10 3 [Pa ⁇ s] as a resin other than the ethylene-based resins (a1) and (a2). ] It is also preferable to use the following ethylene resin (a3) in combination.
  • the ethylene resin (a3) has a density of 0.920 to 0.960 [g / cm 3 ] 3 and a melt flow rate (190 ° C., 21.18 N) of 0.5 to 8.0 [g]. / 10 min].
  • the melt viscosity at 270 ° C. at a shear rate of 120 [sec ⁇ 1 ] is preferably 1.0 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 8.0 ⁇ 10 2 [Pa ⁇ s] or less.
  • a lower one can be preferably used, and it is 6.0 ⁇ 10 2 [Pa ⁇ s] or less. It is also preferable that it is 5.0 ⁇ 10 2 [Pa ⁇ s] or less.
  • the melt viscosity of the base layer (A) can be easily adjusted to the above range.
  • the melt viscosity of the ethylene resin (a3) at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is preferably 3.0 ⁇ 10 2 [Pa ⁇ s] or more, more preferably 4.0 ⁇ 10 2 [Pa ⁇ s].
  • the upper limit of the melt viscosity at 270 ° C. at a shear rate of 6 [sec ⁇ 1 ] is not particularly limited, but is preferably 4.0 ⁇ 10 3 [Pa ⁇ s] or less, more preferably 3.0 ⁇ 10 3 [Pa ⁇ s]. s] or less, and more preferably 2.0 ⁇ 10 3 [Pa ⁇ s] or less.
  • the ethylene-based resin (a3) is not particularly limited.
  • polyethylene resins such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE); -Vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, etc., among which linear low density polyethylene (LLDPE) is This is preferable in that the film properties are improved.
  • LLDPE linear low-density polyethylene
  • LDPE low-density polyethylene
  • MDPE medium-density polyethylene
  • HDPE high-density polyethylene
  • LLDPE linear low-density polyethylene
  • LDPE low-density polyethylene
  • MDPE medium-density polyethylene
  • HDPE high-density polyethylene
  • the melt flow rate (190 ° C., 21.18 N) of the ethylene-based resin (a3) is preferably 0.5 to 8.0 [g / 10 min], and 1.0 to 8.0 [g / 10 min]. More preferably, it is more preferably 2.0 to 5.0 [g / 10 min]. Use of the ethylene resin (a3) having a melt flow rate in the above range facilitates easy opening.
  • the content of the ethylene resin (a3) in the base layer (A) is preferably from 20 to 40% by mass, more preferably from 25 to 35% by mass.
  • the content of the ethylene-based resin (a3) is preferably from 20 to 40% by mass, more preferably from 25 to 35% by mass.
  • the density of the ethylene-based resin (a3) is preferably 0.920 to 0.960 [g / cm 3 ], more preferably 0.920 to 0.950 [g / cm 3 ].
  • the use of the ethylene resin (a3) having a density within the above range is preferable in that good resin extrudability is easily ensured.
  • Heat seal layer (B) As the heat seal layer (B) used in the present invention, various heat seal layers used for a packaging film can be appropriately used.
  • the form of opening of the easy-opening laminated film of the present invention is also particularly limited, for example, due to delamination between the base layer (A) and the heat seal layer (B), or due to cohesive failure of the heat seal layer (B).
  • the heat-sealing layer (B) be a layer having cohesive failure because it can cope with various container shapes.
  • the heat seal layer (B) used in the present invention preferably uses an olefin-based resin as a main resin component because it is easy to obtain adhesion to the base layer.
  • an olefin resin a propylene resin or an ethylene resin can be preferably used.
  • propylene-based resin examples include propylene homopolymer, propylene-ethylene copolymer, propylene-butene-1 copolymer, propylene-ethylene-butene-1 copolymer, and metallocene catalyst-based polypropylene.
  • ethylene resin examples include polyethylene resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), and ethylene-vinyl acetate.
  • polymers ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, etc., among which linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) , Medium density polyethylene (MDPE), high density polyethylene (HDPE) and the like.
  • the propylene-based resin is preferably a propylene-ethylene random copolymer or a propylene-ethylene-butene-1 random copolymer.
  • high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and the like can be preferably used.
  • polyethylene having a density of 0.950 g / cm 3 or more can be preferably used, and polyethylene having a density of 0.955 g / cm 3 or more can be preferably used.
  • the content of the olefin-based resin in the heat seal layer is excellent in oil resistance, there is no reduction in seal strength due to heat sterilization of oil-containing food packages, and it is difficult to cause bag breakage.
  • the content is preferably 90% by mass or more of the components, more preferably 95% by mass or more.
  • the heat seal layer used in the present invention it is preferable to use a propylene resin and an ethylene resin among the olefin resins. By using these resins in combination, it becomes easy to realize a suitable opening property due to the cohesive failure property of the heat seal layer.
  • the melt flow rate (230 ° C., 21.18 N) is preferably 2 to 15 [g / 10 min], more preferably 4 to 10 [g / 10 min].
  • the content of each is preferably 30 to 70% by mass of the propylene-based resin and 30 to 70% by mass of the ethylene-based resin, 40 to 60% by mass of the propylene-based resin, and 40 to 60% by mass of the ethylene-based resin. Is more preferable.
  • EMMA ethylene-methyl methacrylate copolymer
  • EAA ethylene-ethyl acrylate copolymer
  • EMA ethylene-methyl Acrylate copolymer
  • E-EA-MAH ethylene-ethyl acrylate-maleic anhydride copolymer
  • EAA ethylene-acrylic acid copolymer
  • EEMAA ethylene-methacrylic acid copolymer
  • Ethylene copolymers furthermore, an ionomer of an ethylene-acrylic acid copolymer, an ionomer of an ethylene-methacrylic acid copolymer, or the like can be used.
  • the content is preferably 20% by mass or less of the resin component contained in the heat seal layer, and more preferably 10% by mass or less. More preferred.
  • various additives and the like may be appropriately used in addition to the above resin components.
  • a lubricant for example, a lubricant, an antiblocking agent, an ultraviolet absorber, a light stabilizer, an antistatic agent, an antifogging agent, a coloring agent, and the like can be appropriately used.
  • these additives are preferably used in an amount of 2 parts by mass or less, more preferably about 0.01 to 1 part by mass, based on 100 parts by mass of the resin component used in the heat seal layer.
  • the laminated film of the present invention is a laminated film having the above-mentioned base layer (A) and heat seal layer (B). With this configuration, the heat seal surface at the opening of the packaging container is smooth. Even if it is a container or a projection container provided with projections, suitable sealing properties and easy opening properties can be realized.
  • the base layer (A) may be composed of a single layer or may be composed of two or more layers.
  • the ratio of the base layer (A) to the total thickness is high, in order to facilitate the adjustment of the thickness with the heat seal layer (B) when using the co-extrusion method, two or more layers are required.
  • the configuration is also preferable because it results in a multilayer film having excellent homogeneity.
  • each layer of the base layer (A) may be a layer having the above-mentioned range of the melt viscosity, and the resin composition constituting each layer of the base layer (A) is as follows. Even the same mixture may be a mixture of resins having different MFRs or densities, or a mixture having different mixing ratios.
  • the thickness (total thickness) of the laminated film of the present invention is preferably from 15 to 100 ⁇ m, and more preferably from 30 to 50 ⁇ m, from the viewpoint of weight reduction of packaging materials in recent years and the point of easy opening. More preferably, there is.
  • the thickness of the base layer (A) is preferably 80 to 95% of the total thickness of the film, and more preferably 85 to 90%.
  • the thickness of the heat seal layer (B) is preferably in the range of 5 to 20% of the total thickness of the film, and more preferably in the range of 10 to 15%. Within this range, the heat seal strength is stable, shows a suitable easy-opening property, and the film is hardly torn when opened.
  • the laminated film of the present invention utilizes the easy-opening property due to the cohesive failure of the heat seal layer (B), but disperses the force to the base layer (A) to easily form the base layer (A).
  • the heat seal layer (B) is designed to be breakable, so that even if the heat seal layer (B) is thin, sufficient openability can be exhibited.
  • the method for producing the easily-openable laminated film of the present invention is not particularly limited, and for example, each resin or resin mixture used for each layer is heated and melted by a separate extruder, and a co-extrusion multilayer die method or a feed block method is used. After laminating the heat seal layer (B) / base layer (A) in a molten state by a method such as the above, a co-extrusion method of forming into a film by inflation, T-die chill roll method or the like may be used.
  • the coextrusion method is preferable because the thickness ratio of each layer can be adjusted relatively freely, and a laminated film excellent in hygiene and cost performance can be obtained.
  • T-die chill roll method capable of performing melt extrusion at a relatively high temperature is preferable.
  • a surface treatment on the base layer (A) in order to improve the adhesiveness with a printing ink or an adhesive.
  • a surface treatment include, for example, corona treatment, plasma treatment, chromic acid treatment, flame treatment, hot air treatment, surface oxidation treatment such as ozone / ultraviolet treatment, and surface unevenness treatment such as sandblasting.
  • it is a corona treatment.
  • the laminated film of the present invention is a film in which a laminated substrate is laminated on the base layer (A) of the laminated film.
  • the laminate substrate is not particularly limited, but is generally a stretched substrate film because it can secure strength not to break, ensure heat resistance at the time of heat sealing, and improve the design of printing. Is preferred.
  • As the stretched base film a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film or the like can be used. However, in terms of breaking strength, transparency, etc., a biaxially stretched polyester film and a biaxially stretched nylon film are used. Is more preferred.
  • the base film may be subjected to an easy tearing treatment or an antistatic treatment as necessary.
  • the method for producing the laminate film of the present invention is not particularly limited, and examples thereof include a method of laminating a laminate substrate on the base layer (A) layer of the laminated film.
  • a method of laminating a laminate substrate on the laminated film of the present invention include a dry lamination method, a heat lamination method, and a multilayer extrusion coating method. Of these, the dry lamination method is more preferable.
  • the adhesive used for laminating the laminated film and the laminate substrate by the dry lamination method include a polyether-polyurethane-based adhesive and a polyester-polyurethane-based adhesive.
  • the laminated film and the laminated film of the present invention can be suitably used as various packaging materials.
  • it can be suitably used for jelly, tofu, and cooked rice containers, and can be particularly preferably used as a lid material for a packaging container having an opening.
  • polypropylene is preferable.
  • polypropylene is preferable.
  • the content of the propylene monomer unit in the polymer is 70 mol% or more, since sufficient sealing strength can be obtained.
  • the heat-sealing surface of the opening of the packaging container preferably contains the polyolefin-based resin in a proportion of 60% by mass or more, more preferably 80% by mass or more.
  • the content of the polyolefin-based resin on the heat sealing surface is in the above range, it is preferable because particularly preferable sealing strength is easily obtained.
  • the resin that may be used in combination with the polyolefin resin on the heat sealing surface is not particularly limited as long as it has good compatibility with the polypropylene resin and does not hinder heat sealing. Examples include polymers and polyethylene resins such as ethylene- ⁇ -olefin copolymers.
  • the laminated film of the present invention realizes suitable sealing properties and easy-opening properties even if the heat sealing surface of the opening of the packaging container is a smooth packaging container or a projection container provided with projections. it can. In particular, even when performing high-temperature sealing at 170 ° C. or higher, it is possible to achieve a sealing property suitable for any container and an excellent easy-opening property.
  • Example 1 High density polyethylene (density 0.940 g / cm 3 ) using a metallocene catalyst for the base layer (A), melt flow rate (hereinafter, MFR) (190 ° C., 21.18 N) 0.4 g / 10 min, 270 ° C.
  • MFR melt flow rate
  • Example 2 A coextruded laminated film was obtained in the same manner as in Example 1, except that a mixture of 50 parts of m-HDPE, 20 parts of LDPE, and 30 parts of m-LLDPE (1) was used as the resin mixture for the base layer (A).
  • Example 3 A coextruded laminated film was obtained in the same manner as in Example 1, except that a mixture of 50 parts of m-HDPE, 40 parts of LDPE, and 10 parts of m-LLDPE (1) was used as the resin mixture for the base layer (A).
  • Example 4 As the resin mixture for the base layer (A), 40 parts of m-HDPE, 30 parts of LDPE, 20 parts of m-LLDPE (1), a linear low-density polyethylene derived from sugarcane (density 0.918 g / cm 3 , MFR (190 ° C. , 21.18N) 2.3g / 10min, 270 °C melt viscosity 6sec -1: 7.3 ⁇ 10 2 Pa ⁇ s, 120sec -1: 6.0 ⁇ 10 2 Pa ⁇ s) ( hereinafter referred to as bio-LLDPE) 10 A coextruded laminated film was obtained in the same manner as in Example 1 except that the mixture of parts was used.
  • Example 5 A co-extruded laminated film was prepared in the same manner as in Example 1 except that a mixture of 40 parts of m-HDPE, 30 parts of LDPE, 10 parts of m-LLDPE (1), and 20 parts of bio-LLDPE was used as a resin mixture for the base layer (A). Obtained.
  • high-density polyethylene (density 0.946 g / cm 3 , melt flow rate (hereinafter, MFR) (190 ° C, 21.18 N) 0.18 g / 10 min, 270 ° C melt viscosity 6 sec) -1 : 5.3 ⁇ 10 3 Pa ⁇ s, 120 sec ⁇ 1 : 1.2 ⁇ 10 3 Pa ⁇ s) (hereinafter referred to as HDPE (2)) and 20 parts of linear low-density polyethylene using a metallocene catalyst ( density 0.920g / cm 3, MFR (190 °C, 21.18N) 0.85g / 10min, 270 °C melt viscosity 6sec -1: 2.5 ⁇ 10 3 Pa ⁇ s, 120sec -1: 9.9 ⁇ 10 2 Pa ⁇ s) (hereinafter m-LLDPE (2) hereinafter) 50 parts of high density polyethylene (density 0.965 g
  • Example 7 Coextrusion was carried out in the same manner as in Example 6 except that a mixture of 20 parts of HDPE (2), 40 parts of m-LLDPE (2) and 40 parts of HDPE (3) was used as the resin mixture for the base layer (A). A laminated film was obtained.
  • Example 1 A coextruded laminated film was obtained in the same manner as in Example 1 except that a mixture of 80 parts of m-HDPE and 20 parts of m-LLDPE (1) of the base layer (A) was used.
  • Example 2 A coextruded laminated film was obtained in the same manner as in Example 1, except that a mixture of 20 parts of m-HDPE, 20 parts of LDPE and 60 parts of m-LLDPE (1) of the base layer (A) was used.
  • Example 3 A coextruded laminated film was obtained in the same manner as in Example 1 except that a mixture of 100 parts of m-LLDPE (1) of the base layer (A) was used.
  • melt viscosity The melt viscosity when the shear rate was changed at 270 ° C. was measured using a capillary rheometer manufactured by Toyo Seiki.
  • L / D ⁇ 50 mm extruder
  • the laminated films of Examples 1 to 5 of the present invention have good film-forming properties and have suitable sealing properties and easy-opening properties even at high sealing temperatures for various containers.
  • good film-forming properties and favorable easy-openability at a high sealing temperature were not obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film en couches présentant une couche de base (A) et une couche thermoscellable (B), la couche de base (A) contenant une résine d'éthylène (a1) dans laquelle la viscosité à une vitesse de cisaillement de 6 (sec-1) est de 1,4 × 103 (Pa⋅s) ou plus, et la viscosité à une vitesse de cisaillement de 120 (sec-1) est de 1,0 × 103 (Pa⋅s) ou moins. L'utilisation dudit film en couches permet de mouler un excellent film présentant d'excellentes propriétés adhésives par rapport aussi bien à une surface de partie adhérée lisse qu'à une surface de partie adhérée qui présente des renfoncements ou des saillies, et permet également de réaliser des propriétés d'ouverture facile, de sorte que le film soit amovible de manière appropriée.
PCT/JP2019/024457 2018-07-03 2019-06-20 Film en couches et couvercle WO2020008893A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020207035751A KR20210027260A (ko) 2018-07-03 2019-06-20 적층 필름 및 덮개재
JP2019554951A JP6624358B1 (ja) 2018-07-03 2019-06-20 積層フィルム及び蓋材

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2018-126784 2018-07-03
JP2018126784 2018-07-03
JP2018-188283 2018-10-03
JP2018188283 2018-10-03
JP2019-054707 2019-03-22
JP2019054707 2019-03-22

Publications (1)

Publication Number Publication Date
WO2020008893A1 true WO2020008893A1 (fr) 2020-01-09

Family

ID=69060586

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/024457 WO2020008893A1 (fr) 2018-07-03 2019-06-20 Film en couches et couvercle

Country Status (3)

Country Link
JP (1) JP6624358B1 (fr)
KR (1) KR20210027260A (fr)
WO (1) WO2020008893A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10315405A (ja) * 1997-05-22 1998-12-02 Sekisui Chem Co Ltd シーラントフィルム
JP2001310430A (ja) * 2000-04-28 2001-11-06 Toray Plastic Films Co Ltd 易開封性複合フィルムおよび易開封性ポリエチレン製容器
JP2005153324A (ja) * 2003-11-26 2005-06-16 Dainippon Ink & Chem Inc 共押出多層フィルムおよびラミネートフィルム
JP2005319583A (ja) * 2001-09-28 2005-11-17 Showa Denko Plastic Products Co Ltd 積層フィルム、シーラントフィルム及び包装体
JP2008114436A (ja) * 2006-11-02 2008-05-22 Dainippon Printing Co Ltd 包装容器の蓋材用多層積層フィルム
JP2012245767A (ja) * 2011-05-31 2012-12-13 Kuraray Co Ltd 多層構造体、これを用いた容器及びその製造方法
JP2019000991A (ja) * 2017-06-12 2019-01-10 東レフィルム加工株式会社 易開封性複合フィルム

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6291766B2 (ja) 2013-09-25 2018-03-14 Dic株式会社 易開封性積層フィルム、易開封性ラミネートフィルム及び蓋材
JP6993923B2 (ja) * 2018-03-29 2022-01-14 ジェイフィルム株式会社 シーラントフィルムおよび包装材
JP7204334B2 (ja) * 2018-03-30 2023-01-16 三井化学株式会社 ポリオレフィン組成物、積層体および電気化学セル用包装資材

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10315405A (ja) * 1997-05-22 1998-12-02 Sekisui Chem Co Ltd シーラントフィルム
JP2001310430A (ja) * 2000-04-28 2001-11-06 Toray Plastic Films Co Ltd 易開封性複合フィルムおよび易開封性ポリエチレン製容器
JP2005319583A (ja) * 2001-09-28 2005-11-17 Showa Denko Plastic Products Co Ltd 積層フィルム、シーラントフィルム及び包装体
JP2005153324A (ja) * 2003-11-26 2005-06-16 Dainippon Ink & Chem Inc 共押出多層フィルムおよびラミネートフィルム
JP2008114436A (ja) * 2006-11-02 2008-05-22 Dainippon Printing Co Ltd 包装容器の蓋材用多層積層フィルム
JP2012245767A (ja) * 2011-05-31 2012-12-13 Kuraray Co Ltd 多層構造体、これを用いた容器及びその製造方法
JP2019000991A (ja) * 2017-06-12 2019-01-10 東レフィルム加工株式会社 易開封性複合フィルム

Also Published As

Publication number Publication date
KR20210027260A (ko) 2021-03-10
JPWO2020008893A1 (ja) 2020-07-16
JP6624358B1 (ja) 2019-12-25

Similar Documents

Publication Publication Date Title
JP5869569B2 (ja) 直線性のある引き裂き特性を持つヒートシール可能フィルム
JPWO2019131168A1 (ja) 積層フィルム及び食品包装袋
JP5092215B2 (ja) 積層体
JP4419054B2 (ja) 多層フィルム、容器の蓋材および袋
JP6315798B2 (ja) 多層シーラントフィルム
WO2019220912A1 (fr) Film multicouche et matériau d'emballage
JP2012045886A (ja) 共押出多層フィルム及びこれを用いる蓋材
JP6150687B2 (ja) 多層シーラントフィルム
JP4781583B2 (ja) ポリエチレン用易剥離性接着剤及びその構造物
JP6070916B1 (ja) 積層フィルム及び包装材
JP6195789B2 (ja) 多層シーラントフィルム
JP6624358B1 (ja) 積層フィルム及び蓋材
JP2014065508A (ja) 蓋材
JP4938213B2 (ja) 共押出多層フィルムおよびラミネートフィルム
WO2016175335A1 (fr) Film d'étanchéité multicouche
JP4692818B2 (ja) 共押出積層フィルム並びにそれを用いたラミネートフィルム及び包装容器
JP4904770B2 (ja) ポリエチレン用易剥離性接着剤及びその構造物
JP6477985B2 (ja) 積層フィルム、ラミネートフィルム及び包装容器
JP2004314449A (ja) 易開封性多層フィルム、当該フィルムからなる蓋材及び包装体
JP5737560B2 (ja) 易開封性共押出多層フィルム及びこれを用いた包装体
JP4235928B2 (ja) 易開封複合フイルム
JP4877062B2 (ja) 共押出多層フィルム及び該フィルムからなる包装材
JP2005212846A (ja) 再封止可能な袋
JP6590235B1 (ja) 易開封性積層フィルム、易開封性ラミネートフィルム
JP7257777B2 (ja) 積層フィルム及び包装材

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2019554951

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19829978

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19829978

Country of ref document: EP

Kind code of ref document: A1