WO2021002208A1 - Layered film and lid - Google Patents

Layered film and lid Download PDF

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Publication number
WO2021002208A1
WO2021002208A1 PCT/JP2020/023890 JP2020023890W WO2021002208A1 WO 2021002208 A1 WO2021002208 A1 WO 2021002208A1 JP 2020023890 W JP2020023890 W JP 2020023890W WO 2021002208 A1 WO2021002208 A1 WO 2021002208A1
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WO
WIPO (PCT)
Prior art keywords
resin
layer
laminated film
heat
polyethylene
Prior art date
Application number
PCT/JP2020/023890
Other languages
French (fr)
Japanese (ja)
Inventor
松原　弘明
秀樹 川岸
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 JP2021518672A priority Critical patent/JP6973686B2/en
Publication of WO2021002208A1 publication Critical patent/WO2021002208A1/en

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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
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Definitions

  • the present invention relates to a laminated film which has good adhesiveness to an adherend such as a heat-sealed portion of a packaging container and can realize easy-opening property which can be preferably peeled off.
  • a heat-sealing resin layer containing lactic acid-based resin as a main component is used as a laminated film applicable to a container of lactic acid-based resin.
  • the laminated film used is disclosed (see Patent Document 1).
  • the laminated film has suitable heat-sealing properties and easy-opening properties for containers of lactic acid-based resins, etc., but can be applied to packaging materials in which the above-mentioned paper-based materials and biodegradable resins are composited. At that time, further improvement in heat-sealing property and easy-opening property was required.
  • the problem to be solved by the present invention is that it has heat-sealing property and easy-opening property suitable for a packaging material in which a paper-based material and a resin material such as a biodegradable resin are composited, and is suitable for packaging applications.
  • An object of the present invention is to provide a laminated film that can be preferably used.
  • the problem to be solved by the present invention is a laminated film capable of realizing heat sealing property and easy opening property suitable for various materials including environmental load reducing material while using an environmental load reducing material. Is to provide.
  • the problem to be solved by the present invention is a laminated film having suitable easy-opening property in which the heat-sealing layer is less likely to be towed or the paper is peeled off when the adherend is opened after heat-sealing. Is to provide.
  • the present invention is a laminated film having a heat-sealing layer (A) and a resin layer (B) directly laminated with the heat-sealing layer (A), wherein the heat-sealing layer (A) is a polylactic acid-based resin.
  • the resin layer (B) contains at least one of (a1) and the polybutylene succinate resin (a2), and a polyethylene resin (a3) having a melt flow rate (230 ° C., 21.18N) of 2 to 40.
  • the laminated film of the present invention can realize heat-sealing property and easy-opening property suitable for a packaging material such as a container in which a paper or a paper-based material and a resin material such as a biodegradable resin are compounded, the environment can be realized. It is useful for promoting the spread of load-reducing materials.
  • the laminated film of the present invention contains a polylactic acid resin or a polybutylene succinate resin which is a biodegradable resin in the heat seal layer, and the resin layer laminated with the heat seal layer is also a biodegradable resin. Since it contains a certain polylactic acid and a polyethylene-based resin that can be produced from a plant-derived raw material, the laminated film itself is highly environmentally friendly.
  • the laminated film of the present invention has suitable heat-sealing properties and easy-opening properties in a wide temperature range, and therefore can be suitably used as various packaging materials.
  • it is particularly suitable for food and medical packaging because it can realize suitable easy-to-open properties in which stringing and paper peeling are unlikely to occur even when the package is opened.
  • the laminated film of the present invention is a laminated film having a heat-sealing layer (A) and a resin layer (B) directly laminated with the heat-sealing layer (A), and the heat-sealing layer (A) is a polylactic resin.
  • the heat seal layer (A) used in the present invention contains at least one of a polylactic acid resin (a1) and a polybutylene succinate resin (a2) and a melt flow rate (190 ° C., 21.18N) of 2 to 40.
  • the polyethylene-based resin (a3) of the above is contained as a resin component.
  • polylactic acid resin (a1) used for the heat seal layer (A) examples include polylactic acid (poly (D-lactic acid), poly (L-lactic acid)), and a copolymer of D-lactic acid and L-lactic acid.
  • examples thereof include a polymer obtained by polymerizing.
  • polylactic acid is preferable from the viewpoint of film formation stability and availability, and polylactic acid whose main structural unit is L-lactic acid is more preferable. These polymers may be used alone or in combination.
  • hydroxycarboxylic acid, diol, and dicarboxylic acid examples include hydroxycaproic acids such as glycolic acid, hydroxybutyric acid, and hydroxycaproic acid, and hydroxycarboxylic acids such as cyclic lactones such as caprolactone, butyrolactone, lactide, and glycolide; ethylene glycol, Aliper diols such as propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol; aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid; succinic acid, adipic acid, suberic acid, sebacic acid Examples thereof include aliphatic dicarboxylic acids such as.
  • the melt flow rate (190 ° C., 21.18N) is preferably 0.5 to 30 g / 10 min, more preferably 2 It is ⁇ 25 g / 10 min. Within such a melt flow rate range, extrusion molding is easy, and when coextrusion multi-layered, it becomes easy to obtain a laminated film having good fluidity with an adjacent layer and having a better appearance.
  • the density of the polylactic acid resin (a1) is preferably 1.20 to 1.26 g / cm 3 , and more preferably 1.23 to 1.25 g / cm 3 .
  • polybutylene succinate resin (a2) examples include poly (butylene succinate) (PBS) and poly (butylene succinate / adipate) copolymer (PBSA).
  • the poly (butylene succinate) is a polycondensate of 1,4-butanediol and succinic acid, and the poly (butylene succinate / adipic acid) copolymer is added to 1,4-butanediol and succinic acid.
  • Such poly (butylene succinate and poly (butylene succinate / adipate) copolymers) can be made high molecular weight with lactic acid or a polyfunctional isocyanate compound in order to increase the molecular weight, and can be adjusted to an appropriate molecular weight.
  • the melt flow rate (190 ° C., 21.18N) of the polybutylene succinate resin (a2) is preferably about 0.5 to 25 g / 10 min, more preferably 1 to 20 g / 10 min from the viewpoint of film extrusion moldability. is there.
  • the density of the polybutylene succinate resin (a2) is 1.20 ⁇ 1.29g / cm 3, more preferably 1.21 ⁇ 1.27g / cm 3.
  • the polyethylene-based resin (a3) used in the present invention is a polyethylene-based resin having a melt flow rate (190 ° C., 21.18N) of 2 to 40 g / 10 min.
  • the melt flow rate is preferably 3 to 38 g / 10 min, more preferably 4 to 35 g / 10 min.
  • polyethylene-based resin for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE) and the like can be used.
  • low-density polyethylene or linear low-density polyethylene is preferable, and low-density polyethylene is particularly preferable, because suitable heat-sealing property and easy-opening property can be easily obtained.
  • a plant-derived resin such as biopolyethylene produced from a plant-derived raw material because it is beneficial for reducing the environmental load.
  • the ratio of the content of the polyethylene resin (a3) to the total content of the polylactic acid resin (a1) and the polybutylene succinate resin (a2) in the heat seal layer (A) is (a3) / ((a1). ) + (A2)), preferably 60/40 to 90/10, and more preferably 70/30 to 85/15.
  • the total content of the polylactic acid resin (a1), the polybutylene succinate resin (a2) and the polyethylene resin (a3) in the heat seal layer (A) is included in the heat seal layer (A). It is preferably 80% by mass or more, more preferably 90% by mass or more, and the resin component may be substantially composed of only these resins. By setting these contents, it becomes easy to obtain suitable heat-sealing property, easy-opening property, impact resistance, etc. for various materials.
  • the heat seal layer (A) may contain a resin other than the above as long as the effect of the present invention is not impaired.
  • a polyolefin resin such as a polypropylene resin can be preferably exemplified. Examples thereof include ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer and the like.
  • polypropylene-based resin examples include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-butene-1 copolymer, a propylene-ethylene-butene-1 copolymer, a metallocene-catalyzed polypropylene, and the like.
  • resins other than the above-mentioned polyolefin-based resin include ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate (EMA) copolymer, and ethylene-.
  • Ethylene-based copolymers such as ethyl acrylate-maleic anhydride copolymer (E-EA-MAH), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA); and further ethylene- An acrylic acid copolymer ionomer, an ethylene-methacrylic acid copolymer ionomer, and the like can be used.
  • the content thereof is contained in the resin component contained in the heat seal layer. It is preferably used in an amount of 20% by mass or less, and more preferably 10% by mass or less.
  • additives may be blended in the heat seal layer (A) as long as the effects of the present invention are not impaired.
  • the additive include antioxidants, weather stabilizers, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments and the like.
  • the resin layer (B) used in the present invention is a layer that is directly laminated with the heat seal layer (A) of the laminated film.
  • the resin layer (B) contains a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as main resin components.
  • a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as main resin components.
  • the polylactic acid-based resin (b1) and the polyethylene-based resin (b2) may be used alone or in combination.
  • the same one as the polylactic acid-based resin (a1) in the heat seal layer (A) can be used, and the types that can be preferably used, and the preferable range of melt flow rate and density are also the same. ..
  • polybutylene succinate resin (b2) the same one as the polybutylene succinate resin (a2) in the heat seal layer (A) can be used, and a preferable range of types, melt flow rates and densities that can be preferably used. Is the same.
  • polyethylene resin (b3) the same one as the polylactic acid resin (a1) in the heat seal layer (A) can be used, and the types and densities that can be preferably used are also the same. Further, as these polyethylene-based resins, it is preferable to use a plant-derived resin such as biopolyethylene produced from a plant-derived raw material because it is beneficial for reducing the environmental load.
  • a plant-derived resin such as biopolyethylene produced from a plant-derived raw material because it is beneficial for reducing the environmental load.
  • the melt flow rate (190 ° C.) of the polyethylene-based resin (b3) is preferably about 2 to 40 g / 10 min, more preferably 3 to 38 g / 10 min from the viewpoint of film extrusion moldability.
  • the total content of the polylactic acid-based resin (b1), the polybutylene succinate-based resin (b2), and the polyethylene-based resin (b3) in the resin layer (B) is the resin contained in the resin layer (B). It is preferably 80% by mass or more, more preferably 90% by mass or more, and substantially only these resins.
  • the resin layer (B) may contain a resin other than the above, and examples of the other resin include a polyolefin resin other than the polyethylene resin exemplified in the heat seal layer (A), and a polyolefin resin. Examples of resins other than the polyolefin-based resin can be used.
  • the content thereof is preferably 20% by mass or less of the resin component contained in the resin layer (B). It is more preferable to use it in an amount of 10% by mass or less.
  • additives may be blended in the resin layer (B) as long as the effects of the present invention are not impaired.
  • examples of the additive include antioxidants, weather stabilizers, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments and the like.
  • the laminated film of the present invention is a laminated film having the above-mentioned heat-sealing layer (A) and resin layer (B), and the heat-sealing layer (A) and the resin layer (B) are directly laminated.
  • the laminated film of the present invention it is possible to realize suitable heat-sealing property and easy-opening property for packaging materials of various materials including environment-friendly materials.
  • each layer can be composed of a biodegradable resin or a biomass resin using a plant-derived raw material, the laminated film itself is highly environmentally friendly.
  • it is possible to realize easy opening property by interfacial peeling that peels off at the interface with the adherend the appearance of the peeled surface at the time of peeling can be made a good appearance.
  • the heat seal layer (A) constitutes one surface layer of the laminated film.
  • the surface layer opposite to the heat seal layer (A) may be a resin layer (B), but while appropriately adjusting the thickness of the heat seal layer, stability during manufacturing and suitable film forming property can be obtained. Since it may be easy, it is also preferable to laminate another resin layer (C) constituting the surface layer.
  • the same resin layer (B) as the above resin layer (B) can be preferably used, and the resin composition may be exactly the same as that of the resin layer (B) or a different resin composition. It is preferable to use the same resin composition because it is easy to manufacture. In addition, it is possible to adjust the physical characteristics of the laminated film by using different resin formulations.
  • another resin layer (D) may be provided between the resin layer (C) and the resin layer (B), and in particular, in the present invention, the ratio to the total thickness of the layers other than the heat seal layer (A). Therefore, in order to facilitate the thickness adjustment with the heat seal layer (A) when the coextrusion method is used, a four-layer structure is also preferable because it is easy to obtain a multilayer film having excellent homogeneity.
  • the resin layer (D) may be a layer using the resin layer (B) or the resin layer (C) and a preferable resin or composition, and the resin layer (D) may be provided.
  • the resin composition may be a mixture that is exactly the same as the resin layer (B) or the resin layer (C), or different mixtures having different resin formulations, MFRs, and densities may be used.
  • preferable layer configurations include a heat seal layer (A) / resin layer (B), a heat seal layer (A) / resin layer (B) / resin layer (C), and a heat seal layer (A) /.
  • examples thereof include a resin layer (B) / resin layer (C), a heat seal layer (A) / resin layer (B) / resin layer (D) / resin layer (C).
  • the thickness (total thickness) of the laminated film of the present invention is preferably 15 to 50 ⁇ m, particularly in the range of 18 to 40 ⁇ m, from the viewpoint of weight reduction of the packaging material and easy opening. Is more preferable.
  • the thickness of the heat seal layer (A) is preferably in the range of 10 to 70% of the total thickness of the film, and more preferably in the range of 15 to 60%.
  • the thickness of the resin layer (B) is 20 to 70% of the total thickness of the film, and the resin.
  • the thickness of the layer (C) is preferably 10 to 40%, the thickness of the resin layer (B) is 30 to 60%, and the thickness of the resin layer (C) is 15 to 40%. preferable.
  • the thickness of the resin layer (B) with respect to the total thickness of the film is set. It is preferable that the thickness of the resin layer (C) is 10 to 50%, the thickness of the resin layer (D) is 10 to 40%, and the thickness of the resin layer (B) is 10 to 20%. %, The thickness of the resin layer (C) is more preferably 25 to 50%, and the thickness of the resin layer (D) is more preferably 15 to 30%.
  • the heat seal layer (A) is preferably 3 to 40 ⁇ m, more preferably 5 to 20 ⁇ m.
  • each layer of the laminated film of the present invention can be composed of a biodegradable resin or a biomass resin using a plant-derived raw material, excellent environmental friendliness can be realized. Since it has particularly excellent environmental friendliness, the total amount of the biodegradable resin and the biomass resin using the plant-derived raw material in the resin component of the laminated film is preferably 80% by mass or more, preferably 90% by mass or more. It is more preferable that the resin component is substantially composed of only these resins. Further, when a polylactic acid-based resin is used as the main resin component of the resin layer (B), the resin layer (C) and the resin layer (D), the laminated film itself can be biodegradable, which is preferable. Further, when a biomass resin is used as the resin component of each layer, environmental friendliness can be imparted at a relatively low cost.
  • the method for producing the laminated film of the present invention is not particularly limited, but for example, a method such as a co-extrusion multilayer die method or a feed block method in which each resin or resin mixture used for each layer is heated and melted by a separate extruder.
  • a method in which the / resin layer (D) / resin layer (C) is laminated and then coextruded into a film by inflation, a T-die chill roll method, or the like can be mentioned.
  • the coextrusion method is preferable because the thickness ratio of each layer can be adjusted relatively freely, and a laminated film having excellent hygiene and excellent cost performance can be obtained.
  • a resin having a large difference between the melting point and Tg is laminated, the appearance of the film may be deteriorated during the coextrusion process, or it may be difficult to form a uniform layer structure.
  • the T-die chill roll method which can perform melt extrusion at a relatively high temperature, is preferable.
  • the surface opposite to the heat seal layer (A) is to be improved in order to improve the adhesiveness with the printing ink or the adhesive.
  • the laminated film of the present invention can be suitably used as a lid material for various packaging containers, it is also preferable to laminate a laminated base material on the surface opposite to the heat seal layer (A) to form a laminated film.
  • the laminated base material is not particularly limited, but is generally a stretched base material film because it can ensure strength that does not break, heat resistance during heat sealing, and improvement of printing design. Is preferable.
  • As the stretched base film a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film and the like can be used, but the biaxially stretched polyester film and the biaxially stretched nylon film are used in terms of breaking strength, transparency and the like. Is more preferable.
  • an aluminum vapor deposition film, a silica vapor deposition film, an aluminum foil and the like can also be used.
  • the base film may be easily torn or antistatic treated, if necessary.
  • the method for producing the laminated film is not particularly limited, and examples thereof include a method of laminating a laminated base material on the base layer (A) layer of the laminated film.
  • Examples of the method for laminating the laminated base material on the laminated film of the present invention include a dry laminating method, a thermal laminating method, a multi-layer extrusion coating method, and the like, and among these, the dry laminating method is more preferable.
  • examples of the adhesive used when laminating the laminated film and the laminated base material in the dry laminating method include a polyether-polyurethane adhesive and a polyester-polyurethane adhesive. Further, it is preferable to perform a corona discharge treatment on the surface of the surface layer before laminating the coextruded laminated film of the present invention and the base material because the adhesion to the base material is improved.
  • 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 dairy products, yogurt, jelly, tofu, pickle containers, kimchi containers, sweets containers, rice containers, instant noodle containers, etc., and is particularly preferably used as a lid material for packaging containers having openings. it can.
  • various packaging containers such as a polyolefin-based polymer, a paper / polybutylene succinate-based polymer, and a paper / polyolefin-based polymer can be used.
  • the laminated film of the present invention can realize heat-sealing property and easy-opening property suitable for packaging containers of these various materials.
  • Example 1 The following resins were used as the resin components forming each of the heat seal layer (A) and the resin layer (B), and the resin mixture forming each layer was prepared.
  • the resin mixture forming each layer is melted and supplied to two extruders, respectively, and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) becomes 15 ⁇ m / 15 ⁇ m.
  • the coextruded multilayer film manufacturing apparatus feed block and T die temperature: 230 ° C.
  • T-die chill roll method having a feed block is supplied and co-extruded, and cooled with a water-cooled metal cooling roll at 40 ° C.
  • Example 2 The following resin is used as the resin component forming the heat seal layer (A), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 30 ⁇ m / 20 ⁇ m.
  • a laminated film having a total thickness of 50 ⁇ m was formed in the same manner as in Example 1 except for the above.
  • PE (2) linear low density polyethylene
  • Example 3 The following resin is used as the resin component forming the heat seal layer (A) and the resin layer (B), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B).
  • a laminated film having a total thickness of 30 ⁇ m was formed in the same manner as in Example 1 except that the thickness was 15 ⁇ m / 15 ⁇ m.
  • Heat seal layer (A) 100 parts by mass of PE (1).
  • Example 4 The following resin is used as the resin component for forming the heat seal layer (A), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 10 ⁇ m / 20 ⁇ m. A laminated film having a total thickness of 30 ⁇ m was formed in the same manner as in Example 1 except for the above.
  • PBS Polybutylene succinate copolymer
  • Example 5 The following resin is used as the resin component forming the resin layer (B), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 10 ⁇ m / 20 ⁇ m.
  • a laminated film having a total thickness of 30 ⁇ m was formed in the same manner as in Example 1 except for the above.
  • PE (3) 100 parts by mass.
  • the 1% secant modulus of the films obtained in the above Examples and Comparative Examples measured below was evaluated as rigidity (hardness) according to the following criteria.
  • a film cut out at a length of 300 mm ⁇ width of 25.4 mm (marked line spacing of 200 mm) was used as a test piece so that the longitudinal direction was the film flow direction (vertical direction), and ASTM D- It was carried out under the condition of a tensile speed of 20 mm / min according to 882.
  • ⁇ 350 MPa or less.
  • X 350 MPa or more.
  • the test piece was peeled by 90 ° at a rate of 300 mm / min using a tensile tester (manufactured by A & D Co., Ltd.) in a constant temperature room at 23 ° C. and 50% RH, and the heat seal strength was measured. From the results of the heat seal strength measured above, the heat seal property in the paper container was evaluated according to the following criteria.
  • ⁇ Heat seal strength of 5 to 20 N / 15 mm.
  • X The heat seal strength is less than 5N / 15mm or more than 20N / 15mm.
  • the lid material was manually opened and opened using the same lid material made of the laminate film obtained above on the flange portion of the round cup paper container produced at the time of measuring the heat seal strength. The opening feeling at the time of opening was confirmed, and the opening property in a paper container was evaluated according to the following criteria.
  • ⁇ The force required for peeling the lid material is constant, and smooth peeling is easy.
  • X The force required for peeling the lid material is not constant, and the peeling is not smooth.
  • the laminated films of the present invention of Examples 1 to 5 have heat-sealing properties and are easy to use even for a packaging material in which a paper-based material and a resin material such as a biodegradable resin are composited. It had openability, and had rigidity, film formation property, impact resistance, etc. suitable for packaging applications.

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Abstract

A layered film having a heat-seal layer (A) and a resin layer (B) directly layered on the heat-seal layer (A), the layered film being such that: the heat-seal layer (A) contains at least one of a polylactic-acid-based resin (a1) and a polybutylene-succinate-based resin (a2), and a polyethylene-based resin (a3) that has a melt flow rate (230°C, 21.18 N) of 2-40; and the resin layer (B) contains, as main resin components, at least one of a polylactic-acid-based resin (b1), a polybutylene-succinate-based resin (b2), and a polyethylene-based resin (b3). Using this layered film makes it possible to achieve suitable heat-sealing properties and ease of unsealing for a packaging material in which a paper-based material and a biodegradable resin or other resin material are composited.

Description

積層フィルム及び蓋材Laminated film and lid material
　本発明は、包装容器のヒートシール部等の被着体に対して良好な接着性を有し、かつ好適に剥離可能な易開封性を実現できる積層フィルムに関するものである。 The present invention relates to a laminated film which has good adhesiveness to an adherend such as a heat-sealed portion of a packaging container and can realize easy-opening property which can be preferably peeled off.
　従来より、包装袋や包装容器等の包装材には、ポリエチレンやポリプロピレン、ポリエチレンテレフタレート等の材料が広く使用されている。近年、これらプラスチック製包装材は、化石資源を原料として使用していることや、環境中に廃棄されると長期間分解しないことなど、環境への負荷が大きいことから、植物由来の原料を使用したバイオ樹脂、土中や水中で加水分解や生分解により分解する生分解性樹脂、環境対応性の高い紙系材料等の使用が検討されている。このような環境対応に配慮した包装材としては、例えば、紙系材料と、ポリ乳酸やポリブチレンサクシネート等の生分解性樹脂とを複合化した容器などが検討されている（特許文献１、２参照）。 Conventionally, materials such as polyethylene, polypropylene, and polyethylene terephthalate have been widely used for packaging materials such as packaging bags and containers. In recent years, these plastic packaging materials use plant-derived raw materials because they use fossil resources as raw materials and do not decompose for a long period of time when disposed of in the environment, which has a large impact on the environment. The use of biodegradable resins, biodegradable resins that decompose by hydrolysis or biodegradation in soil or water, and paper-based materials with high environmental friendliness is being studied. As such an environmentally friendly packaging material, for example, a container in which a paper-based material and a biodegradable resin such as polylactic acid or polybutylene succinate are compounded has been studied (Patent Document 1, Patent Document 1, 2).
　これら環境対応に配慮した包装材の蓋材等に適用可能な積層フィルムとしては、例えば、乳酸系樹脂の容器に対して適用可能なフィルムとして、乳酸系樹脂を主成分とするヒートシール樹脂層を使用した積層フィルムが開示されている（特許文献１参照）。当該積層フィルムは、乳酸系樹脂の容器等に対して、好適なヒートシール性や易開封性を有するが、上記のような紙系材料と生分解性樹脂等を複合化した包装材への適用に際しては、ヒートシール性や易開封性の更なる向上が求められていた。 As a laminated film applicable to the lid material of these environment-friendly packaging materials, for example, as a film applicable to a container of lactic acid-based resin, a heat-sealing resin layer containing lactic acid-based resin as a main component is used. The laminated film used is disclosed (see Patent Document 1). The laminated film has suitable heat-sealing properties and easy-opening properties for containers of lactic acid-based resins, etc., but can be applied to packaging materials in which the above-mentioned paper-based materials and biodegradable resins are composited. At that time, further improvement in heat-sealing property and easy-opening property was required.
特開２００３－０４０２４２号公報Japanese Unexamined Patent Publication No. 2003-040242 特開２０１８－１６７８７０号公報JP-A-2018-167870 特開２００７－２９０３１１号公報Japanese Unexamined Patent Publication No. 2007-290311
　本発明が解決しようとする課題は、紙系材料と生分解性樹脂等の樹脂材料とを複合化した包装材に対しても好適なヒートシール性と易開封性とを有し、包装用途に好適に使用できる積層フィルムを提供することにある。 The problem to be solved by the present invention is that it has heat-sealing property and easy-opening property suitable for a packaging material in which a paper-based material and a resin material such as a biodegradable resin are composited, and is suitable for packaging applications. An object of the present invention is to provide a laminated film that can be preferably used.
　また、本発明が解決しようとする課題は、環境負荷低減材料を使用しながらも、環境負荷低減材料をはじめとする各種材料に対して好適なヒートシール性と易開封性とを実現できる積層フィルムを提供することにある。 Further, the problem to be solved by the present invention is a laminated film capable of realizing heat sealing property and easy opening property suitable for various materials including environmental load reducing material while using an environmental load reducing material. Is to provide.
　さらに、本発明が解決しようとする課題は、上記課題に加え、ヒートシール後の開封時に被着体にヒートシール層の糸曳きや、紙剥け等が生じにくい好適な易開封性を有する積層フィルムを提供することにある。 Further, in addition to the above-mentioned problems, the problem to be solved by the present invention is a laminated film having suitable easy-opening property in which the heat-sealing layer is less likely to be towed or the paper is peeled off when the adherend is opened after heat-sealing. Is to provide.
　本発明は、ヒートシール層（Ａ）と、前記ヒートシール層（Ａ）と直接積層される樹脂層（Ｂ）とを有する積層フィルムであって、前記ヒートシール層（Ａ）がポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の少なくとも一種と、メルトフローレート（２３０℃、２１．１８Ｎ）が２～４０のポリエチレン系樹脂（ａ３）とを含有し、前記樹脂層（Ｂ）が、ポリ乳酸系樹脂（ｂ１）、ポリブチレンサクシネート系樹脂（ｂ２）及びポリエチレン系樹脂（ｂ３）の少なくとも一種を主たる樹脂成分として含有する積層フィルムにより上記課題を解決するものである。 The present invention is a laminated film having a heat-sealing layer (A) and a resin layer (B) directly laminated with the heat-sealing layer (A), wherein the heat-sealing layer (A) is a polylactic acid-based resin. The resin layer (B) contains at least one of (a1) and the polybutylene succinate resin (a2), and a polyethylene resin (a3) having a melt flow rate (230 ° C., 21.18N) of 2 to 40. ) Resolves the above problem with a laminated film containing at least one of a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as a main resin component.
　本発明の積層フィルムは、紙や紙系材料と生分解性樹脂等の樹脂材料とを複複合化した容器等の包装材に対して好適なヒートシール性や易開封性を実現できることから、環境負荷低減材料の普及促進に有用である。 Since the laminated film of the present invention can realize heat-sealing property and easy-opening property suitable for a packaging material such as a container in which a paper or a paper-based material and a resin material such as a biodegradable resin are compounded, the environment can be realized. It is useful for promoting the spread of load-reducing materials.
　また、本発明の積層フィルムは、ヒートシール層に生分解性樹脂であるポリ乳酸系樹脂やポリブチレンサクシネート系樹脂を含有し、当該ヒートシール層と積層する樹脂層においても生分解性樹脂であるポリ乳酸や、植物由来の原料により製造可能なポリエチレン系樹脂を含有することから、積層フィルム自体の環境対応性も高い。 Further, the laminated film of the present invention contains a polylactic acid resin or a polybutylene succinate resin which is a biodegradable resin in the heat seal layer, and the resin layer laminated with the heat seal layer is also a biodegradable resin. Since it contains a certain polylactic acid and a polyethylene-based resin that can be produced from a plant-derived raw material, the laminated film itself is highly environmentally friendly.
　さらに、本発明の積層フィルムは、広範な温度域において好適なヒートシール性や易開封性を有することから、各種包装材として好適に使用できる。また、開封時にも糸曳きや紙剥け等が生じにくい好適な易開封性を実現できることから、食品用や医療用の包装用途に特に好適である。 Furthermore, the laminated film of the present invention has suitable heat-sealing properties and easy-opening properties in a wide temperature range, and therefore can be suitably used as various packaging materials. In addition, it is particularly suitable for food and medical packaging because it can realize suitable easy-to-open properties in which stringing and paper peeling are unlikely to occur even when the package is opened.
　本発明の積層フィルムは、ヒートシール層（Ａ）と、ヒートシール層（Ａ）と直接積層される樹脂層（Ｂ）とを有する積層フィルムであり、ヒートシール層（Ａ）がポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の少なくとも一種と、メルトフローレート（１９０℃、２１．１８Ｎ）が２～４０のポリエチレン系樹脂（ａ３）とを含有し、樹脂層（Ｂ）が、ポリ乳酸系樹脂（ｂ１）、ポリブチレンサクシネート系樹脂（ｂ２）及びポリエチレン系樹脂（ｂ３）の少なくとも一種を主たる樹脂成分として含有する積層フィルムである。 The laminated film of the present invention is a laminated film having a heat-sealing layer (A) and a resin layer (B) directly laminated with the heat-sealing layer (A), and the heat-sealing layer (A) is a polylactic resin. A resin layer (B) containing at least one of (a1) and a polybutylene succinate resin (a2) and a polyethylene resin (a3) having a melt flow rate (190 ° C., 21.18N) of 2 to 40. Is a laminated film containing at least one of a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as a main resin component.
［ヒートシール層（Ａ）］
　本発明に使用するヒートシール層（Ａ）は、ポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の少なくとも一種と、メルトフローレート（１９０℃、２１．１８Ｎ）が２～４０のポリエチレン系樹脂（ａ３）とを樹脂成分として含有する。ヒートシール層として、これら樹脂を含有することで、紙系材料と生分解性樹脂等の樹脂材料の積層体等の被着体に対して、好適なヒートシール性と易開封性とを実現できる。 [Heat seal layer (A)]
The heat seal layer (A) used in the present invention contains at least one of a polylactic acid resin (a1) and a polybutylene succinate resin (a2) and a melt flow rate (190 ° C., 21.18N) of 2 to 40. The polyethylene-based resin (a3) of the above is contained as a resin component. By containing these resins as the heat-sealing layer, it is possible to realize suitable heat-sealing properties and easy-opening properties for an adherend such as a laminate of a paper-based material and a resin material such as a biodegradable resin. ..
　ヒートシール層（Ａ）に使用するポリ乳酸系樹脂（ａ１）としては、例えば、ポリ乳酸（ポリ（Ｄ－乳酸）、ポリ（Ｌ－乳酸））、Ｄ－乳酸とＬ－乳酸の共重合体、Ｄ－乳酸と他のヒドロキシカルボン酸との共重合体、Ｌ－乳酸と他のヒドロキシカルボン酸との共重合体、ジカルボン酸およびジオールをエステル反応させて得られたポリエステル成分を乳酸成分と共重合させた重合体等が挙げられる。なかでも、成膜安定性や入手容易性等の観点からポリ乳酸が好ましく、主たる構造単位がＬ－乳酸であるポリ乳酸が寄り好ましい。これら重合体は、単独で使用しても併用して使用してもよい。 Examples of the polylactic acid resin (a1) used for the heat seal layer (A) include polylactic acid (poly (D-lactic acid), poly (L-lactic acid)), and a copolymer of D-lactic acid and L-lactic acid. , A copolymer of D-lactic acid and other hydroxycarboxylic acid, a copolymer of L-lactic acid and other hydroxycarboxylic acid, a polyester component obtained by ester reaction of dicarboxylic acid and diol, and a lactic acid component. Examples thereof include a polymer obtained by polymerizing. Of these, polylactic acid is preferable from the viewpoint of film formation stability and availability, and polylactic acid whose main structural unit is L-lactic acid is more preferable. These polymers may be used alone or in combination.
　上記ヒドロキシカルボン酸、ジオール、ジカルボン酸としては、例えば、グリコール酸、ヒドロキシ酪酸、ヒドロキシカプロン酸等のヒドロキシカプロン酸類、カプロラクトン、ブチロラクトン、ラクチド、グリコリド等の環状ラクトン類などのヒドロキシカルボン酸；エチレングリコール、プロピレングリコール、１，４－ブタンジオール、１，４－シクロヘキサンジメタノールなどの脂肪族ジオール；テレフタル酸、イソフタル酸、ナフタレンジカルボン酸などの芳香族ジカルボン酸；コハク酸、アジピン酸、スベリン酸、セバシン酸などの脂肪族ジカルボン酸等が挙げられる。 Examples of the hydroxycarboxylic acid, diol, and dicarboxylic acid include hydroxycaproic acids such as glycolic acid, hydroxybutyric acid, and hydroxycaproic acid, and hydroxycarboxylic acids such as cyclic lactones such as caprolactone, butyrolactone, lactide, and glycolide; ethylene glycol, Aliper diols such as propylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol; aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid; succinic acid, adipic acid, suberic acid, sebacic acid Examples thereof include aliphatic dicarboxylic acids such as.
　前記ポリ乳酸系樹脂（ａ１）は、押出成形時に良好な流動性を実現しやすいことからメルトフローレート（１９０℃、２１．１８Ｎ）が、好ましくは０．５～３０ｇ／１０ｍｉｎ、より好ましくは２～２５ｇ／１０ｍｉｎである。かかるメルトフローレートの範囲であると、押出成形が容易であり、また、共押出多層化するときに、隣接層との流動性も良好でより外観に優れた積層フィルムを得やすくなる。 Since the polylactic acid-based resin (a1) tends to realize good fluidity during extrusion molding, the melt flow rate (190 ° C., 21.18N) is preferably 0.5 to 30 g / 10 min, more preferably 2 It is ~ 25 g / 10 min. Within such a melt flow rate range, extrusion molding is easy, and when coextrusion multi-layered, it becomes easy to obtain a laminated film having good fluidity with an adjacent layer and having a better appearance.
　また、ポリ乳酸系樹脂（ａ１）の密度は１．２０～１．２６ｇ／ｃｍ３であることが好ましく、１．２３～１．２５ｇ／ｃｍ３であることがより好ましい。 The density of the polylactic acid resin (a1) is preferably 1.20 to 1.26 g / cm 3 , and more preferably 1.23 to 1.25 g / cm 3 .
　ポリブチレンサクシネート系樹脂（ａ２）としては、例えば、ポリ（ブチレンサクシネート）（ＰＢＳ）、ポリ（ブチレンサクシネート／アジペート）共重合体（ＰＢＳＡ）が挙げられる。前記ポリ（ブチレンサクシネート）は、１，４－ブタンジオールとコハク酸の重縮合物であり、ポリ（ブチレンサクシネート／アジペート）共重合体は、１，４－ブタンジオールとコハク酸に加えて、アジピン酸を加えた重縮合物である。かかるポリ（ブチレンサクシネート及びポリ（ブチレンサクシネート／アジペート）共重合体は、分子量を上げるために、乳酸または多官能イソシアネート化合物によって高分子量化することができ、適当な分子量に調整できる。 Examples of the polybutylene succinate resin (a2) include poly (butylene succinate) (PBS) and poly (butylene succinate / adipate) copolymer (PBSA). The poly (butylene succinate) is a polycondensate of 1,4-butanediol and succinic acid, and the poly (butylene succinate / adipic acid) copolymer is added to 1,4-butanediol and succinic acid. , A polycondensate to which adipic acid is added. Such poly (butylene succinate and poly (butylene succinate / adipate) copolymers) can be made high molecular weight with lactic acid or a polyfunctional isocyanate compound in order to increase the molecular weight, and can be adjusted to an appropriate molecular weight.
　ポリブチレンサクシネート系樹脂（ａ２）のメルトフローレート（１９０℃、２１．１８Ｎ）は、０．５～２５ｇ／１０ｍｉｎ程度がフィルム押出成形性の点から好ましく、さらに好ましくは１～２０ｇ／１０ｍｉｎである。 The melt flow rate (190 ° C., 21.18N) of the polybutylene succinate resin (a2) is preferably about 0.5 to 25 g / 10 min, more preferably 1 to 20 g / 10 min from the viewpoint of film extrusion moldability. is there.
　また、ポリブチレンサクシネート系樹脂（ａ２）の密度は１．２０～１．２９ｇ／ｃｍ３であることが好ましく、１．２１～１．２７ｇ／ｃｍ３であることがより好ましい。 It is preferable that the density of the polybutylene succinate resin (a2) is 1.20 ~ 1.29g / cm 3, more preferably 1.21 ~ 1.27g / cm 3.
　本発明に使用するポリエチレン系樹脂（ａ３）は、メルトフローレート（１９０℃、２１．１８Ｎ）が２～４０ｇ／１０ｍｉｎのポリエチレン系樹脂である。当該ポリエチレン系樹脂を使用することで、紙系基材に対して好適なヒートシール性や易解体性を実現できる。当該メルトフローレートは好ましくは、３～３８ｇ／１０ｍｉｎ、より好ましくは４～３５ｇ／１０ｍｉｎである。 The polyethylene-based resin (a3) used in the present invention is a polyethylene-based resin having a melt flow rate (190 ° C., 21.18N) of 2 to 40 g / 10 min. By using the polyethylene-based resin, heat-sealing properties and easy disassembly properties suitable for paper-based substrates can be realized. The melt flow rate is preferably 3 to 38 g / 10 min, more preferably 4 to 35 g / 10 min.
　当該ポリエチレン系樹脂としては、例えば、低密度ポリエチレン（ＬＤＰＥ）、直鎖状低密度ポリエチレン（ＬＬＤＰＥ）、中密度ポリエチレン（ＭＤＰＥ）、高密度ポリエチレン（ＨＤＰＥ）等が使用できる。なかでも、好適なヒートシール性や易開封性を得やすいことから、低密度ポリエチレン又は直鎖低密度ポリエチレンが好ましく、低密度ポリエチレンが特に好ましい。また、これらポリエチレン系樹脂として、植物由来の原料から製造されるバイオポリエチレン等の植物由来樹脂を使用することで、環境負荷低減に有益であるため好ましい。 As the polyethylene-based resin, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE) and the like can be used. Among them, low-density polyethylene or linear low-density polyethylene is preferable, and low-density polyethylene is particularly preferable, because suitable heat-sealing property and easy-opening property can be easily obtained. Further, as these polyethylene-based resins, it is preferable to use a plant-derived resin such as biopolyethylene produced from a plant-derived raw material because it is beneficial for reducing the environmental load.
　ヒートシール層（Ａ）中のポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の総含有量に対するポリエチレン系樹脂（ａ３）の含有量の比が、（ａ３）／（（ａ１）＋（ａ２））で表される質量比で、６０／４０～９０／１０であることが好ましく、７０／３０～８５／１５であることがより好ましい。含有量比を当該範囲とすることで、紙ポリエチレン被覆シートやポリエチレン滅菌シート等と適度な強度を有しする易開封包材を提供できる。 The ratio of the content of the polyethylene resin (a3) to the total content of the polylactic acid resin (a1) and the polybutylene succinate resin (a2) in the heat seal layer (A) is (a3) / ((a1). ) + (A2)), preferably 60/40 to 90/10, and more preferably 70/30 to 85/15. By setting the content ratio within the above range, it is possible to provide an easily open packaging material having appropriate strength with a paper polyethylene coated sheet, a polyethylene sterilized sheet, or the like.
　ヒートシール層（Ａ）中のポリ乳酸系樹脂（ａ１）、ポリブチレンサクシネート系樹脂（ａ２）及びポリエチレン系樹脂（ａ３）の含有量は、これらの合計が、ヒートシール層（Ａ）に含まれる樹脂成分中の８０質量％以上であることが好ましく、９０質量％以上であることがより好ましく、実質的に樹脂成分がこれら樹脂のみからなるものであってもよい。これら含有量とすることで、各種材料への好適なヒートシール性や易開封性、耐衝撃性等を得やすくなる。 The total content of the polylactic acid resin (a1), the polybutylene succinate resin (a2) and the polyethylene resin (a3) in the heat seal layer (A) is included in the heat seal layer (A). It is preferably 80% by mass or more, more preferably 90% by mass or more, and the resin component may be substantially composed of only these resins. By setting these contents, it becomes easy to obtain suitable heat-sealing property, easy-opening property, impact resistance, etc. for various materials.
　ヒートシール層（Ａ）中には、本発明の効果を損なわない範囲で、上記以外の他の樹脂を含有してもよい。当該他の樹脂としては、ポリプロピレン系樹脂等のポリオレフィン系樹脂を好ましく例示できる。エチレン－酢酸ビニル共重合体、エチレン－メチルメタアクリレート共重合体、エチレン－エチルアクリレート共重合体、エチレン－メタアクリル酸共重合体等が挙げられる。また、ポリプロピレン系樹脂としては、プロピレン単独重合体、プロピレン－エチレン共重合体、プロピレン－ブテン－１共重合体、プロピレン－エチレン－ブテン－１共重合体、メタロセン触媒系ポリプロピレン等が挙げられる。 The heat seal layer (A) may contain a resin other than the above as long as the effect of the present invention is not impaired. As the other resin, a polyolefin resin such as a polypropylene resin can be preferably exemplified. Examples thereof include ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer and the like. Examples of the polypropylene-based resin include a propylene homopolymer, a propylene-ethylene copolymer, a propylene-butene-1 copolymer, a propylene-ethylene-butene-1 copolymer, a metallocene-catalyzed polypropylene, and the like.
　また、上記ポリオレフィン系樹脂以外の樹脂としては、例えば、エチレン－メチルメタアクリレート共重合体（ＥＭＭＡ）、エチレン－エチルアクリレート共重合体（ＥＥＡ）、エチレン－メチルアクリレート（ＥＭＡ）共重合体、エチレン－エチルアクリレート－無水マレイン酸共重合体（Ｅ－ＥＡ－ＭＡＨ）、エチレン－アクリル酸共重合体（ＥＡＡ）、エチレン－メタクリル酸共重合体（ＥＭＡＡ）等のエチレン系共重合体；更にはエチレン－アクリル酸共重合体のアイオノマー、エチレン－メタクリル酸共重合体のアイオノマー等を使用できる。 Examples of resins other than the above-mentioned polyolefin-based resin include ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate (EMA) copolymer, and ethylene-. Ethylene-based copolymers such as ethyl acrylate-maleic anhydride copolymer (E-EA-MAH), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA); and further ethylene- An acrylic acid copolymer ionomer, an ethylene-methacrylic acid copolymer ionomer, and the like can be used.
　上記ポリ乳酸系樹脂（ａ１）、ポリブチレンサクシネート系樹脂（ａ２）、ポリエチレン系樹脂（ａ３）以外の他の樹脂を使用する場合には、その含有量がヒートシール層に含まれる樹脂成分中の２０質量％以下で使用することが好ましく、１０質量％以下で使用することがより好ましい。 When a resin other than the above polylactic acid resin (a1), polybutylene succinate resin (a2), and polyethylene resin (a3) is used, the content thereof is contained in the resin component contained in the heat seal layer. It is preferably used in an amount of 20% by mass or less, and more preferably 10% by mass or less.
　これら他の樹脂を使用する場合には、ヒートシール層（Ａ）に含まれる樹脂成分中の２０質量％以下とすることが好ましく、１０質量％以下とすることがより好ましい。 When these other resins are used, it is preferably 20% by mass or less, and more preferably 10% by mass or less of the resin component contained in the heat seal layer (A).
　ヒートシール層（Ａ）中には、本発明の効果を損なわない範囲で各種の添加剤を配合してもよい。当該添加剤としては、酸化防止剤、耐候安定剤、帯電防止剤、防曇剤、アンチブロッキング剤、滑剤、核剤、顔料等を例示できる。 Various additives may be blended in the heat seal layer (A) as long as the effects of the present invention are not impaired. Examples of the additive include antioxidants, weather stabilizers, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments and the like.
［樹脂層（Ｂ）］
　本発明に使用する樹脂層（Ｂ）は、積層フィルムのヒートシール層（Ａ）と直接積層される層である。当該樹脂層（Ｂ）としては、ポリ乳酸系樹脂（ｂ１）、ポリブチレンサクシネート系樹脂（ｂ２）及びポリエチレン系樹脂（ｂ３）を主たる樹脂成分として含有する。当該樹脂層（Ｂ）を使用することで環境対応が可能な材料を使用しつつヒートシール層（Ａ）と好適に積層でき、得られる積層フィルムの良好な剥離性を実現できる。ポリ乳酸系樹脂（ｂ１）及びポリエチレン系樹脂（ｂ２）は、各々単独で使用しても併用してもよい。いずれかを単独で使用する場合には、得られる積層フィルムの物性調整が容易であるため好ましく、併用する場合には、ブロッキング性、製膜性、低温落下衝撃性等のバランスが良い物性を維持できるため好ましい。 [Resin layer (B)]
The resin layer (B) used in the present invention is a layer that is directly laminated with the heat seal layer (A) of the laminated film. The resin layer (B) contains a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as main resin components. By using the resin layer (B), it can be suitably laminated with the heat seal layer (A) while using an environment-friendly material, and good peelability of the obtained laminated film can be realized. The polylactic acid-based resin (b1) and the polyethylene-based resin (b2) may be used alone or in combination. When either of them is used alone, it is preferable because it is easy to adjust the physical properties of the obtained laminated film, and when they are used together, the physical properties with a good balance of blocking property, film forming property, low temperature drop impact property, etc. are maintained. It is preferable because it can be done.
　ポリ乳酸系樹脂（ｂ１）としては、上記ヒートシール層（Ａ）におけるポリ乳酸系樹脂（ａ１）と同様のものを使用でき、好ましく使用できる種類、メルトフローレートや密度の好ましい範囲も同様である。 As the polylactic acid-based resin (b1), the same one as the polylactic acid-based resin (a1) in the heat seal layer (A) can be used, and the types that can be preferably used, and the preferable range of melt flow rate and density are also the same. ..
　ポリブチレンサクシネート系樹脂（ｂ２）としては、上記ヒートシール層（Ａ）におけるポリブチレンサクシネート系樹脂（ａ２）と同様のものを使用でき、好ましく使用できる種類、メルトフローレートや密度の好ましい範囲も同様である。 As the polybutylene succinate resin (b2), the same one as the polybutylene succinate resin (a2) in the heat seal layer (A) can be used, and a preferable range of types, melt flow rates and densities that can be preferably used. Is the same.
　ポリエチレン系樹脂（ｂ３）としては、上記ヒートシール層（Ａ）におけるポリ乳酸系樹脂（ａ１）と同様のものを使用でき、好ましく使用できる種類、密度の好ましい範囲も同様である。また、これらポリエチレン系樹脂として、植物由来の原料から製造されるバイオポリエチレン等の植物由来樹脂を使用することで、環境負荷低減に有益であるため好ましい。 As the polyethylene resin (b3), the same one as the polylactic acid resin (a1) in the heat seal layer (A) can be used, and the types and densities that can be preferably used are also the same. Further, as these polyethylene-based resins, it is preferable to use a plant-derived resin such as biopolyethylene produced from a plant-derived raw material because it is beneficial for reducing the environmental load.
　ポリエチレン系樹脂（ｂ３）のメルトフローレート（１９０℃）は２～４０ｇ／１０ｍｉｎ程度がフィルム押出成形性の点から好ましく、さらに好ましくは３～３８ｇ／１０ｍｉｎである。 The melt flow rate (190 ° C.) of the polyethylene-based resin (b3) is preferably about 2 to 40 g / 10 min, more preferably 3 to 38 g / 10 min from the viewpoint of film extrusion moldability.
　樹脂層（Ｂ）中のポリ乳酸系樹脂（ｂ１）、ポリブチレンサクシネート系樹脂（ｂ２）及びポリエチレン系樹脂（ｂ３）の含有量としては、その総量が、樹脂層（Ｂ）に含まれる樹脂成分中の８０質量％以上であることが好ましく、９０質量％以上であることがより好ましく、実質的にこれら樹脂のみであることも好ましい。 The total content of the polylactic acid-based resin (b1), the polybutylene succinate-based resin (b2), and the polyethylene-based resin (b3) in the resin layer (B) is the resin contained in the resin layer (B). It is preferably 80% by mass or more, more preferably 90% by mass or more, and substantially only these resins.
　樹脂層（Ｂ）中には、上記以外の他の樹脂を含有してもよく、当該他の樹脂としては、上記ヒートシール層（Ａ）にて例示したポリエチレン系樹脂以外のポリオレフィン系樹脂や、当該ポリオレフィン系樹脂以外の樹脂として例示したものを使用できる。 The resin layer (B) may contain a resin other than the above, and examples of the other resin include a polyolefin resin other than the polyethylene resin exemplified in the heat seal layer (A), and a polyolefin resin. Examples of resins other than the polyolefin-based resin can be used.
　上記樹脂層（Ｂ）中に、オレフィン系樹脂以外の他の樹脂を使用する場合には、その含有量が樹脂層（Ｂ）に含まれる樹脂成分中の２０質量％以下で使用することが好ましく、１０質量％以下で使用することがより好ましい。 When a resin other than the olefin resin is used in the resin layer (B), the content thereof is preferably 20% by mass or less of the resin component contained in the resin layer (B). It is more preferable to use it in an amount of 10% by mass or less.
　樹脂層（Ｂ）中には、本発明の効果を損なわない範囲で各種の添加剤を配合してもよい。当該添加剤としては、酸化防止剤、耐候安定剤、帯電防止剤、防曇剤、アンチブロッキング剤、滑剤、核剤、顔料等を例示できる。 Various additives may be blended in the resin layer (B) as long as the effects of the present invention are not impaired. Examples of the additive include antioxidants, weather stabilizers, antistatic agents, antifogging agents, antiblocking agents, lubricants, nucleating agents, pigments and the like.
［積層フィルム］
　本発明の積層フィルムは、上記のヒートシール層（Ａ）と樹脂層（Ｂ）とを有し、ヒートシール層（Ａ）と樹脂層（Ｂ）とが直接積層された積層フィルムである。本発明の積層フィルムは、当該構成とすることで、環境対応材料をはじめとする各種材料の包装材に対して、好適なヒートシール性と易開封性とを実現できる。また、各層を生分解性樹脂や植物由来の原料を使用したバイオマス樹脂から構成できることから、積層フィルム自体の環境対応性も高い。さらに、被着体との界面にて剥離する界面剥離による易開封性を実現できることから、剥離した際の剥離面の外観を良好な外観とできる。 [Laminated film]
The laminated film of the present invention is a laminated film having the above-mentioned heat-sealing layer (A) and resin layer (B), and the heat-sealing layer (A) and the resin layer (B) are directly laminated. By adopting the laminated film of the present invention, it is possible to realize suitable heat-sealing property and easy-opening property for packaging materials of various materials including environment-friendly materials. Further, since each layer can be composed of a biodegradable resin or a biomass resin using a plant-derived raw material, the laminated film itself is highly environmentally friendly. Further, since it is possible to realize easy opening property by interfacial peeling that peels off at the interface with the adherend, the appearance of the peeled surface at the time of peeling can be made a good appearance.
　本発明の積層フィルムにおいては、ヒートシール層（Ａ）が積層フィルムの一方の表層を構成する。ヒートシール層（Ａ）とは他方の表層は、樹脂層（Ｂ）であってもよいが、ヒートシール層の厚みを好適に調整しつつ、製造時の安定性や好適な成膜性を得やすい場合があることから、表層を構成する他の樹脂層（Ｃ）を積層することも好ましい。 In the laminated film of the present invention, the heat seal layer (A) constitutes one surface layer of the laminated film. The surface layer opposite to the heat seal layer (A) may be a resin layer (B), but while appropriately adjusting the thickness of the heat seal layer, stability during manufacturing and suitable film forming property can be obtained. Since it may be easy, it is also preferable to laminate another resin layer (C) constituting the surface layer.
　当該樹脂層（Ｃ）としては、上記樹脂層（Ｂ）と同様のものを好ましく使用でき、樹脂層（Ｂ）と全く同一の樹脂配合であっても、異なる樹脂配合であってもよい。同一の樹脂配合とすれば製造が容易であるため好ましい。また、異なる樹脂配合とすることで積層フィルムの物性調整も可能となる。 As the resin layer (C), the same resin layer (B) as the above resin layer (B) can be preferably used, and the resin composition may be exactly the same as that of the resin layer (B) or a different resin composition. It is preferable to use the same resin composition because it is easy to manufacture. In addition, it is possible to adjust the physical characteristics of the laminated film by using different resin formulations.
　さらに、樹脂層（Ｃ）と樹脂層（Ｂ）との間に他の樹脂層（Ｄ）を設けてもよく、特に本発明においてはヒートシール層（Ａ）以外の層の全厚に占める割合が高いので、共押出法を用いる際のヒートシール層（Ａ）との厚み調整を容易にするために、四層構成にすることも、均質性に優れる多層フィルムを得やすいため好ましい。樹脂層（Ｄ）を設ける場合にも、樹脂層（Ｄ）が、上記樹脂層（Ｂ）や樹脂層（Ｃ）と好ましい樹脂や配合を使用した層とすればよく、樹脂層（Ｄ）の樹脂組成物は、樹脂層（Ｂ）や樹脂層（Ｃ）と、全く同一の混合物であっても、それぞれの樹脂の配合や、ＭＦＲ、密度が異なる異なる混合物を使用してもよい。 Further, another resin layer (D) may be provided between the resin layer (C) and the resin layer (B), and in particular, in the present invention, the ratio to the total thickness of the layers other than the heat seal layer (A). Therefore, in order to facilitate the thickness adjustment with the heat seal layer (A) when the coextrusion method is used, a four-layer structure is also preferable because it is easy to obtain a multilayer film having excellent homogeneity. Even when the resin layer (D) is provided, the resin layer (D) may be a layer using the resin layer (B) or the resin layer (C) and a preferable resin or composition, and the resin layer (D) may be provided. The resin composition may be a mixture that is exactly the same as the resin layer (B) or the resin layer (C), or different mixtures having different resin formulations, MFRs, and densities may be used.
　具体的な好ましい層構成の例としては、ヒートシール層（Ａ）／樹脂層（Ｂ）、ヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｃ）、ヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｃ）、ヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｄ）／樹脂層（Ｃ）等が例示できる。 Specific examples of preferable layer configurations include a heat seal layer (A) / resin layer (B), a heat seal layer (A) / resin layer (B) / resin layer (C), and a heat seal layer (A) /. Examples thereof include a resin layer (B) / resin layer (C), a heat seal layer (A) / resin layer (B) / resin layer (D) / resin layer (C).
　本発明の積層フィルムの厚さ（全厚）としては、包装材料の軽量化の観点と、易開封性の点より、１５～５０μｍであることが好ましく、なかでも１８～４０μｍの範囲であることがより好ましい。 The thickness (total thickness) of the laminated film of the present invention is preferably 15 to 50 μm, particularly in the range of 18 to 40 μm, from the viewpoint of weight reduction of the packaging material and easy opening. Is more preferable.
　ヒートシール層（Ａ）の厚さはフィルム全厚の１０～７０％の範囲であることが好ましく、１５～６０％の範囲であることがより好ましい。積層フィルムをヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｃ）の三層構成とする場合には、フィルム全厚に対する樹脂層（Ｂ）の厚さを２０～７０％、樹脂層（Ｃ）の厚さを１０～４０％とすることが好ましく、樹脂層（Ｂ）の厚さを３０～６０％、樹脂層（Ｃ）の厚さを１５～４０％とすることがより好ましい。積層フィルムをヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｄ）／樹脂層（Ｃ）の四層構成とする場合には、フィルム全厚に対する樹脂層（Ｂ）の厚さを１０～４０％、樹脂層（Ｃ）の厚さを１０～５０％、樹脂層（Ｄ）の厚さを１０～４０％とすることが好ましく、樹脂層（Ｂ）の厚さを１０～２０％、樹脂層（Ｃ）の厚さを２５～５０％、樹脂層（Ｄ）の厚さを１５～３０％とすることがより好ましい。 The thickness of the heat seal layer (A) is preferably in the range of 10 to 70% of the total thickness of the film, and more preferably in the range of 15 to 60%. When the laminated film has a three-layer structure of a heat seal layer (A) / resin layer (B) / resin layer (C), the thickness of the resin layer (B) is 20 to 70% of the total thickness of the film, and the resin. The thickness of the layer (C) is preferably 10 to 40%, the thickness of the resin layer (B) is 30 to 60%, and the thickness of the resin layer (C) is 15 to 40%. preferable. When the laminated film has a four-layer structure of a heat seal layer (A) / resin layer (B) / resin layer (D) / resin layer (C), the thickness of the resin layer (B) with respect to the total thickness of the film is set. It is preferable that the thickness of the resin layer (C) is 10 to 50%, the thickness of the resin layer (D) is 10 to 40%, and the thickness of the resin layer (B) is 10 to 20%. %, The thickness of the resin layer (C) is more preferably 25 to 50%, and the thickness of the resin layer (D) is more preferably 15 to 30%.
　具体的な厚みとしては、ヒートシール層（Ａ）は好ましくは３～４０μｍ、より好ましくは５～２０μｍである。 As a specific thickness, the heat seal layer (A) is preferably 3 to 40 μm, more preferably 5 to 20 μm.
　本発明の積層フィルムは、各層を生分解性樹脂や植物由来原料を使用したバイオマス樹脂から構成できるため優れた環境対応性を実現できる。特に優れた環境対応性を有することから、積層フィルムの樹脂成分中の生分解性樹脂と植物由来の原料を使用したバイオマス樹脂の総量が、８０質量％以上であることが好ましく、９０質量％以上であることがより好ましく、樹脂成分が実質的にこれら樹脂のみからなるものも特に好ましい。また、樹脂層（Ｂ）、樹脂層（Ｃ）及び樹脂層（Ｄ）の樹脂成分としてポリ乳酸系樹脂を主たる樹脂成分とした場合には、積層フィルム自体を生分解性とできるため好ましい。また、各層の樹脂成分として、バイオマス樹脂を使用した場合には、比較的安価に環境対応性を付与できる。 Since each layer of the laminated film of the present invention can be composed of a biodegradable resin or a biomass resin using a plant-derived raw material, excellent environmental friendliness can be realized. Since it has particularly excellent environmental friendliness, the total amount of the biodegradable resin and the biomass resin using the plant-derived raw material in the resin component of the laminated film is preferably 80% by mass or more, preferably 90% by mass or more. It is more preferable that the resin component is substantially composed of only these resins. Further, when a polylactic acid-based resin is used as the main resin component of the resin layer (B), the resin layer (C) and the resin layer (D), the laminated film itself can be biodegradable, which is preferable. Further, when a biomass resin is used as the resin component of each layer, environmental friendliness can be imparted at a relatively low cost.
［積層フィルムの製造方法］
　本発明の積層フィルムの製造方法としては、特に限定されないが、例えば、各層に用いる各樹脂又は樹脂混合物を、それぞれ別々の押出機で加熱溶融させ、共押出多層ダイス法やフィードブロック法等の方法により溶融状態でヒートシール層（Ａ）／樹脂層（Ｂ）、ヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｃ）、または、ヒートシール層（Ａ）／樹脂層（Ｂ）／樹脂層（Ｄ）／樹脂層（Ｃ）、を積層した後、インフレーションやＴダイ・チルロール法等によりフィルム状に成形する共押出する方法が挙げられる。共押出法は、各層の厚さの比率を比較的自由に調整することが可能で、衛生性に優れ、コストパフォーマンスにも優れた積層フィルムが得られるので好ましい。融点とＴｇとの差が大きい樹脂を積層するような場合は、共押出加工時にフィルム外観が劣化したり、均一な層構成形成が困難になったりする場合がある。このような劣化を抑制するためには、比較的高温で溶融押出を行うことができるＴダイ・チルロール法が好ましい。 [Manufacturing method of laminated film]
The method for producing the laminated film of the present invention is not particularly limited, but for example, a method such as a co-extrusion multilayer die method or a feed block method in which each resin or resin mixture used for each layer is heated and melted by a separate extruder. Heat seal layer (A) / resin layer (B), heat seal layer (A) / resin layer (B) / resin layer (C), or heat seal layer (A) / resin layer (B) in a molten state. A method in which the / resin layer (D) / resin layer (C) is laminated and then coextruded into a film by inflation, a T-die chill roll method, or the like can be mentioned. The coextrusion method is preferable because the thickness ratio of each layer can be adjusted relatively freely, and a laminated film having excellent hygiene and excellent cost performance can be obtained. When a resin having a large difference between the melting point and Tg is laminated, the appearance of the film may be deteriorated during the coextrusion process, or it may be difficult to form a uniform layer structure. In order to suppress such deterioration, the T-die chill roll method, which can perform melt extrusion at a relatively high temperature, is preferable.
　さらに、ヒートシール層（Ａ）とは他方の表面に印刷やラミネート等を行なう場合には、印刷インキや接着剤との接着性等を向上させるため、ヒートシール層（Ａ）とは他方の表面に表面処理を施すことが好ましい。このような表面処理としては、例えば、コロナ処理、プラズマ処理、クロム酸処理、火炎処理、熱風処理、オゾン・紫外線処理等の表面酸化処理、あるいはサンドブラスト等の表面凹凸処理を挙げることができるが、好ましくはコロナ処理である。 Further, when printing or laminating on the surface opposite to the heat seal layer (A), the surface opposite to the heat seal layer (A) is to be improved in order to improve the adhesiveness with the printing ink or the adhesive. Is preferably surface-treated. Examples of such surface treatments include 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. Corona treatment is preferable.
［ラミネートフィルム］
　本発明の積層フィルムは、各種包装容器の蓋材等に好適に使用できることから、ヒートシール層（Ａ）とは他方の表面にラミネート基材を積層してラミネートフィルムとすることも好ましい。ラミネート基材としては、特に限定されるものではないが、一般に破断しない強度の確保、ヒ－トシール時の耐熱性確保、および印刷の意匠性向上等が図られることから、延伸基材フィルムであることが好ましい。延伸基材フィルムとしては、２軸延伸ポリエステルフィルム、２軸延伸ナイロンフィルム、２軸延伸ポリプロピレンフィルム等を使用できるが、破断強度、透明性等の点で２軸延伸ポリエステルフィルム及び２軸延伸ナイロンフィルムがより好ましい。またアルミ蒸着フィルム、シリカ蒸着フィルム、アルミ箔等も使用できる。なお、前記基材フィルムとしては、必要性に応じて、易裂け性処理や帯電防止処理が施されていてもよい。 [Laminate film]
Since the laminated film of the present invention can be suitably used as a lid material for various packaging containers, it is also preferable to laminate a laminated base material on the surface opposite to the heat seal layer (A) to form a laminated film. The laminated base material is not particularly limited, but is generally a stretched base material film because it can ensure strength that does not break, heat resistance during heat sealing, and improvement of printing design. Is preferable. As the stretched base film, a biaxially stretched polyester film, a biaxially stretched nylon film, a biaxially stretched polypropylene film and the like can be used, but the biaxially stretched polyester film and the biaxially stretched nylon film are used in terms of breaking strength, transparency and the like. Is more preferable. Further, an aluminum vapor deposition film, a silica vapor deposition film, an aluminum foil and the like can also be used. The base film may be easily torn or antistatic treated, if necessary.
　ラミネートフィルムの製造方法としては、特に限定されないが、例えば、前記積層フィルムのベース層（Ａ）層の上にラミネート基材をラミネートする方法が挙げられる。本発明の前記積層フィルムにラミネート基材をラミネートする方法としては、例えば、ドライラミネート法、熱ラミネート法、多層押出コーティング法等が挙げられるが、これらのなかでも、ドライラミネート法がより好ましい。また、ドライラミネート法で、前記積層フィルムとラミネート基材とをラミネートする際に用いる接着剤としては、例えば、ポリエーテル－ポリウレタン系接着剤、ポリエステル－ポリウレタン系接着剤等が挙げられる。また、本発明の共押出積層フィルムと基材とをラミネートする前に、前記表面層の表面にコロナ放電処理を施すと、基材との密着性が向上するため好ましい。 The method for producing the laminated film is not particularly limited, and examples thereof include a method of laminating a laminated base material on the base layer (A) layer of the laminated film. Examples of the method for laminating the laminated base material on the laminated film of the present invention include a dry laminating method, a thermal laminating method, a multi-layer extrusion coating method, and the like, and among these, the dry laminating method is more preferable. Further, examples of the adhesive used when laminating the laminated film and the laminated base material in the dry laminating method include a polyether-polyurethane adhesive and a polyester-polyurethane adhesive. Further, it is preferable to perform a corona discharge treatment on the surface of the surface layer before laminating the coextruded laminated film of the present invention and the base material because the adhesion to the base material is improved.
［包装体］
　本発明の積層フィルム及びラミネートフィルムは、各種の包装用材料として好適に用いることができる。特に、乳製品、ヨーグルト、ゼリー、豆腐、漬物容器、キムチ容器、お菓子容器、米飯容器、インスタントラーメン容器等に好適に用いることができ、開口部を有する包装容器の蓋材として特に好適に使用できる。 [Packaging]
The laminated film and the laminated film of the present invention can be suitably used as various packaging materials. In particular, it can be suitably used for dairy products, yogurt, jelly, tofu, pickle containers, kimchi containers, sweets containers, rice containers, instant noodle containers, etc., and is particularly preferably used as a lid material for packaging containers having openings. it can.
　開口部を有する包装容器としては、ポリオレフィン系重合体、紙／ポリブチレンサクシネート系重合体、紙／ポリオレフィン系重合体等の各種包装容器を使用できる。本発明の積層フィルムは、これら各種材料の包装容器に対して好適なヒートシール性と易開封性とを実現できる。 As the packaging container having an opening, various packaging containers such as a polyolefin-based polymer, a paper / polybutylene succinate-based polymer, and a paper / polyolefin-based polymer can be used. The laminated film of the present invention can realize heat-sealing property and easy-opening property suitable for packaging containers of these various materials.
　次に、実施例及び比較例を挙げて本発明をより詳しく説明する。 Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.
（実施例１）
　ヒートシール層（Ａ）及び樹脂層（Ｂ）の各層を形成する樹脂成分として、各々下記の樹脂を使用して、各層を形成する樹脂混合物を調整した。各層を形成する樹脂混合物を２台の押出機に各々溶融して供給し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが１５μｍ／１５μｍとなるように、フィードブロックを有するＴダイ・チルロール法の共押出多層フィルム製造装置（フィードブロック及びＴダイ温度：２３０℃）にそれぞれ供給して共押出して、４０℃の水冷金属冷却ロールで冷却し、全厚が３０μｍの積層フィルムを成形した。
　ヒートシール層（Ａ）：ポリブチレンサクシネート系樹脂（ＰＴＴＭＣＣ　Ｂｉｏｃｈｅｍ社製「ＦＤ９２ＰＢ」、密度：１．２４ｇ／ｃｍ３、融点８４℃、ＭＦＲ：４ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＢＳＡ（１）」という。）２０質量部、低密度ポリエチレン（密度：０．９２０ｇ／ｃｍ３、融点１１５℃、ＭＦＲ：３５ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＥ（１）」という。）８０質量部の樹脂混合物。
　樹脂層（Ｂ）：ＰＥ（１）１００質量部。 (Example 1)
The following resins were used as the resin components forming each of the heat seal layer (A) and the resin layer (B), and the resin mixture forming each layer was prepared. The resin mixture forming each layer is melted and supplied to two extruders, respectively, and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) becomes 15 μm / 15 μm. As described above, the coextruded multilayer film manufacturing apparatus (feed block and T die temperature: 230 ° C.) having a T-die chill roll method having a feed block is supplied and co-extruded, and cooled with a water-cooled metal cooling roll at 40 ° C. A laminated film having a total thickness of 30 μm was formed.
Heat seal layer (A): Polybutylene succinate resin (PTTMCC Biochem "FD92PB", density: 1.24 g / cm 3 , melting point 84 ° C., MFR: 4 g / 10 minutes (190 ° C., 21.18 N); Hereinafter referred to as "PBSA (1)") 20 parts by mass, low-density polyethylene (density: 0.920 g / cm 3 , melting point 115 ° C., MFR: 35 g / 10 minutes (190 ° C., 21.18 N); hereinafter, "PBSA (1)". PE (1) ") 80 parts by mass of resin mixture.
Resin layer (B): 100 parts by mass of PE (1).
（実施例２）
　ヒートシール層（Ａ）を形成する樹脂成分として、下記の樹脂を使用し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが３０μｍ／２０μｍとなるようにした以外は、実施例１と同様にして、全厚が５０μｍの積層フィルムを成形した。
　ヒートシール層（Ａ）：ＰＢＳＡ（１）５０質量部、直鎖状低密度密度ポリエチレン（密度：０．９２０ｇ／ｃｍ３、融点１１０℃、ＭＦＲ：１８ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＥ（２）」という。）５０質量部の樹脂混合物。 (Example 2)
The following resin is used as the resin component forming the heat seal layer (A), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 30 μm / 20 μm. A laminated film having a total thickness of 50 μm was formed in the same manner as in Example 1 except for the above.
Heat seal layer (A): PBSA (1) 50 parts by mass, linear low density polyethylene (density: 0.920 g / cm 3 , melting point 110 ° C, MFR: 18 g / 10 minutes (190 ° C, 21.18N) ; Hereinafter referred to as "PE (2)") 50 parts by mass of resin mixture.
（実施例３）
　ヒートシール層（Ａ）、樹脂層（Ｂ）を形成する樹脂成分として、下記の樹脂を使用し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが１５μｍ／１５μｍとなるようにした以外は、実施例１と同様にして、全厚が３０μｍの積層フィルムを成形した。
　ヒートシール層（Ａ）：ＰＥ（１）１００質量部。
　樹脂層（Ｂ）：ポリ乳酸系重合体（Ｎａｔｕｒｅ　Ｗｏｒｋｓ社製「４０４３Ｄ」、密度：１．２４ｇ／ｃｍ３、ＭＦＲ：６ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＬＡ」という。）２０質量部、ＰＥ（１）８０質量部。 (Example 3)
The following resin is used as the resin component forming the heat seal layer (A) and the resin layer (B), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B). A laminated film having a total thickness of 30 μm was formed in the same manner as in Example 1 except that the thickness was 15 μm / 15 μm.
Heat seal layer (A): 100 parts by mass of PE (1).
Resin layer (B): Polylactic acid polymer (“4043D” manufactured by Nature Works, density: 1.24 g / cm 3 , MFR: 6 g / 10 minutes (190 ° C., 21.18N); hereinafter referred to as “PLA”. 20 parts by mass, PE (1) 80 parts by mass.
（実施例４）
　ヒートシール層（Ａ）を形成する樹脂成分として、下記の樹脂を使用し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが１０μｍ／２０μｍとなるようにした以外は、実施例１と同様にして、全厚が３０μｍの積層フィルムを成形した。
　ヒートシール層（Ａ）：ポリブチレンサクシネート系共重合体（ＰＴＴＭＣＣ　Ｂｉｏｃｈｅｍ社製「ＦＺ９１ＰＢ」、密度：１．２６ｇ／ｃｍ３、融点１１５℃、ＭＦＲ：５ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＢＳ」という。）１０質量部、ＰＬＡ（１）１０質量部、ＰＥ（１）８０質量部の樹脂混合物。 (Example 4)
The following resin is used as the resin component for forming the heat seal layer (A), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 10 μm / 20 μm. A laminated film having a total thickness of 30 μm was formed in the same manner as in Example 1 except for the above.
Heat seal layer (A): Polybutylene succinate copolymer (PTTMCC Biochem "FZ91PB", density: 1.26 g / cm 3 , melting point 115 ° C, MFR: 5 g / 10 minutes (190 ° C, 21.18N) ); Hereinafter referred to as "PBS") A resin mixture of 10 parts by mass of PLA (1) and 80 parts by mass of PE (1).
（実施例５）
　樹脂層（Ｂ）を形成する樹脂成分として、下記の樹脂を使用し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが１０μｍ／２０μｍとなるようにした以外は、実施例１と同様にして、全厚が３０μｍの積層フィルムを成形した。
　樹脂層（Ｂ）：直鎖状低密度密度バイオポリエチレン（ＢＲＡＳＣＥＭ社製「バイオポリエチレン　ＳＬＨ２１８」、密度：０．９２０ｇ／ｃｍ３、融点１１０℃、ＭＦＲ：４ｇ／１０分（１９０℃、２１．１８Ｎ）；以下、「ＰＥ（３）」という。）１００質量部。 (Example 5)
The following resin is used as the resin component forming the resin layer (B), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B) is 10 μm / 20 μm. A laminated film having a total thickness of 30 μm was formed in the same manner as in Example 1 except for the above.
Resin layer (B): Linear low density biopolyethylene (BRASSEM "Biopolyethylene SLH218", density: 0.920 g / cm 3 , melting point 110 ° C., MFR: 4 g / 10 minutes (190 ° C., 21.18 N) ); Hereinafter referred to as "PE (3)") 100 parts by mass.
（比較例１）
　ヒートシール層（Ａ）、樹脂層（Ｂ）を形成する樹脂成分として、下記の樹脂を使用し、ヒートシール層（Ａ）／樹脂層（Ｂ）にて形成される積層フィルムの各層の厚さが１０μｍ／２０μｍとなるようにした以外は、実施例２と同様にして、全厚が３０μｍの積層フィルムを成形した。
　ヒートシール層（Ａ）：ＰＥ（１）１００質量部。
　樹脂層（Ｂ）：ＰＬＡ（１）１００質量部。 (Comparative Example 1)
The following resin is used as the resin component forming the heat seal layer (A) and the resin layer (B), and the thickness of each layer of the laminated film formed by the heat seal layer (A) / resin layer (B). A laminated film having a total thickness of 30 μm was formed in the same manner as in Example 2 except that the thickness was 10 μm / 20 μm.
Heat seal layer (A): 100 parts by mass of PE (1).
Resin layer (B): 100 parts by mass of PLA (1).
（比較例２）
　ＰＢＳ（１）を用いて、フィルム厚さが３０μｍの単層フィルムを得た。 (Comparative Example 2)
Using PBS (1), a single-layer film having a film thickness of 30 μm was obtained.
（比較例３）
　ＰＬＡ（１）を用いて、フィルム厚さが３０μｍの単層フィルムを得た。 (Comparative Example 3)
Using PLA (1), a single-layer film having a film thickness of 30 μm was obtained.
（比較例４）
　ＰＥ（１）を用いて、フィルム厚さが３０μｍの単層フィルムを得た。 (Comparative Example 4)
Using PE (1), a single-layer film having a film thickness of 30 μm was obtained.
　上記実施例及び比較例で得られたフィルムにつき、以下の評価を行った。得られた結果を下表に示した。 The films obtained in the above Examples and Comparative Examples were evaluated as follows. The results obtained are shown in the table below.
（ラミネートフィルムの作製）
　上記の実施例及び比較例で得られた多層フィルムの樹脂層（Ｂ）側表面又は単層フィルムの表面に二軸延伸ポリエチレンテレフタレート（ＰＥＴ）フィルム（厚さ１２μｍ）をドライラミネーションで貼り合わせて、ラミネートフィルムを得た。この際、ドライラミネーション用接着剤としては、ＤＩＣ株式会社製の２液硬化型接着剤（ポリエステル系接着剤「ＬＸ６３Ｆ」及び硬化剤「ＫＰ９０」）を使用した。 (Making a laminated film)
A biaxially stretched polyethylene terephthalate (PET) film (thickness 12 μm) is attached to the resin layer (B) side surface of the multilayer film obtained in the above Examples and Comparative Examples or the surface of the single layer film by dry lamination. A laminated film was obtained. At this time, as the adhesive for dry lamination, a two-component curable adhesive (polyester adhesive "LX63F" and curing agent "KP90") manufactured by DIC Corporation was used.
（剛性の評価）
　上記の実施例及び比較例で得られたフィルムの下記にて測定される１％割線モジュラスを剛性（硬さ）として、下記基準にて評価した。１％割線モジュラスの測定は、長手方向がフィルムの流れ方向（縦方向）となるように、縦３００ｍｍ×横２５．４ｍｍ（標線間隔２００ｍｍ）で切り出したフィルムを試験片として用い、ＡＳＴＭ　Ｄ－８８２に準拠して引張速度２０ｍｍ／ｍｉｎの条件で行った。
　○：３５０ＭＰａ以下。
　×：３５０ＭＰａ以上。 (Evaluation of rigidity)
The 1% secant modulus of the films obtained in the above Examples and Comparative Examples measured below was evaluated as rigidity (hardness) according to the following criteria. For the measurement of the 1% secant modulus, a film cut out at a length of 300 mm × width of 25.4 mm (marked line spacing of 200 mm) was used as a test piece so that the longitudinal direction was the film flow direction (vertical direction), and ASTM D- It was carried out under the condition of a tensile speed of 20 mm / min according to 882.
◯: 350 MPa or less.
X: 350 MPa or more.
（紙ＰＥシートへのシール性評価）
　実施例、比較例で作成したラミネートサンプルと、ポリエチレン樹脂で被覆された紙（５００μｍ）に１１０～１６０でヒートシールを実施した。（０．２ＭＰａ、１．２秒）　シールサンプルを１５ｍｍの短冊状に切り出し、試験片とし、この試験片を２３℃、５０％ＲＨの恒温室において引張試験機（株式会社エー・アンド・ディー製）を用いて、３００ｍｍ／分の速度で１８０°剥離を行い、ヒートシール強度を測定した。
各種シートに対する温度依存性によるシール性を評価した。
　○：４Ｎ／１５ｍｍ以上。
　×：４Ｎ／１５ｍｍ未満、またはシール面で剥がれず、フィルムの破断発生。 (Evaluation of sealability on paper PE sheet)
The laminate samples prepared in Examples and Comparative Examples and paper (500 μm) coated with polyethylene resin were heat-sealed at 110 to 160. (0.2 MPa, 1.2 seconds) A seal sample was cut into a strip of 15 mm to make a test piece, and this test piece was placed in a constant temperature room at 23 ° C. and 50% RH with a tensile tester (manufactured by A & D Co., Ltd.). ) Was used to perform 180 ° peeling at a speed of 300 mm / min, and the heat seal strength was measured.
The sealing property due to the temperature dependence on various sheets was evaluated.
◯: 4N / 15 mm or more.
X: Less than 4N / 15mm, or the film did not peel off on the sealing surface, causing film breakage.
（紙容器でのヒートシール性の評価）
　上記で得られたラミネートフィルムを蓋材として（樹脂層（Ａ）とポリエチレン樹脂で被覆された紙からなる外径７０ｍｍ、深さ５０ｍｍ、幅５ｍｍのフランジ部を有する丸カップ紙容器のフランジ部に、シール温度１４０℃、シール圧力０．２ＭＰａ、シール時間１秒の条件でヒートシールした。次いで、ヒートシールしたフィルムを２３℃で自然冷却後、１５ｍｍ幅の短冊状に切り出して試験片とし、この試験片を２３℃、５０％ＲＨの恒温室において引張試験機（株式会社エー・アンド・ディー製）を用いて、３００ｍｍ／分の速度で９０°剥離を行い、ヒートシール強度を測定した。
　上記で測定したヒートシール強度の結果から、下記の基準で紙容器でのヒートシール性を評価した。
　○：ヒートシール強度が５～２０Ｎ／１５ｍｍのもの。
　×：ヒートシール強度が５Ｎ／１５ｍｍ未満又は２０Ｎ／１５ｍｍを超えるもの。 (Evaluation of heat sealability in paper containers)
Using the laminate film obtained above as a lid material (on the flange portion of a round cup paper container having a flange portion having an outer diameter of 70 mm, a depth of 50 mm, and a width of 5 mm, which is made of a resin layer (A) and paper coated with polyethylene resin. Heat-sealed under the conditions of a sealing temperature of 140 ° C., a sealing pressure of 0.2 MPa, and a sealing time of 1 second. Next, the heat-sealed film was naturally cooled at 23 ° C. and then cut into strips having a width of 15 mm to obtain a test piece. The test piece was peeled by 90 ° at a rate of 300 mm / min using a tensile tester (manufactured by A & D Co., Ltd.) in a constant temperature room at 23 ° C. and 50% RH, and the heat seal strength was measured.
From the results of the heat seal strength measured above, the heat seal property in the paper container was evaluated according to the following criteria.
◯: Heat seal strength of 5 to 20 N / 15 mm.
X: The heat seal strength is less than 5N / 15mm or more than 20N / 15mm.
（紙容器での開封性の評価）
　上記のヒートシール強度の測定時に作製した丸カップ紙容器のフランジ部に上記で得られたラミネートフィルムからなる蓋材をヒートシールしたものと同じものを用いて、蓋材を手で開封し、開封した際の開封感を確認し、下記の基準で紙容器での開封性を評価した。
　○：蓋材の剥離に要する力が一定で、円滑な剥離が容易である。
　×：蓋材の剥離に要する力が一定せず、剥離に円滑さを欠く。 (Evaluation of openability in paper containers)
The lid material was manually opened and opened using the same lid material made of the laminate film obtained above on the flange portion of the round cup paper container produced at the time of measuring the heat seal strength. The opening feeling at the time of opening was confirmed, and the opening property in a paper container was evaluated according to the following criteria.
◯: The force required for peeling the lid material is constant, and smooth peeling is easy.
X: The force required for peeling the lid material is not constant, and the peeling is not smooth.
（紙容器での剥離外観の評価）
　上記の開封性の評価で、蓋材を開封した後の丸カップ紙容器のフランジ部及びシール部の外観を目視で観察し、剥離外観の評価として下記の基準で、膜残り・糸引き及び紙剥けを評価した。 (Evaluation of peeling appearance in paper container)
In the above evaluation of openability, the appearance of the flange and seal of the round cup paper container after opening the lid material was visually observed, and the peeling appearance was evaluated according to the following criteria: film residue / stringing and paper. The peeling was evaluated.
（紙容器での膜残り・糸引きの評価）
　○：膜残り、糸引きがすべてないもの。
　×：膜残り、糸引きの少なくとも一つがあるもの。 (Evaluation of film residue and stringing in paper containers)
◯: No film residue or stringing.
X: Those with at least one remaining film and stringing.
（紙容器での紙剥けの評価）
　○：紙剥けがないもの。
　×：紙剥けがあるもの。 (Evaluation of paper peeling in paper containers)
◯: No paper peeling.
×: Paper is peeled off.
（紙容器での密封性の評価）
　上記のヒートシール強度の測定時に作製した丸カップ紙容器のフランジ部に上記で得られたラミネートフィルムからなる蓋材をヒートシールしたものと同じものを用いて、容器の底にノズルを差し込み、空気を送り込んで内圧をかけ、シールテスター（株式会社サン科学製）にて蓋材が破裂した際の破裂強度を測定した。得られた破裂強度から、下記の基準で密封性を評価した。
　○：破裂強度が２０ＫＰａ以上のもの。
　×：破裂強度が２０ＫＰａ未満のもの。 (Evaluation of sealability in paper containers)
Using the same lid material made of the laminate film obtained above on the flange of the round cup paper container prepared when measuring the heat seal strength, insert the nozzle into the bottom of the container and air. Was sent to apply internal pressure, and the burst strength when the lid material burst was measured with a seal tester (manufactured by Sun Scientific Co., Ltd.). From the obtained burst strength, the sealing property was evaluated according to the following criteria.
◯: The burst strength is 20 KPa or more.
X: The burst strength is less than 20 KPa.
（滅菌紙でのヒートシール強度の測定）
　上記で得られたラミネートフィルムのシール面とノンコートタイプの滅菌紙（旭・デュポン　フラッシュスパン　プロダクツ株式会社製「タイベック１０５９Ｂ」）のシール面とを重ね合わせ、ヒートシール温度１４０℃、シール圧力０．２ＭＰａ、シール時間０．７秒の条件でヒートシールした。次いで、ヒートシールしたフィルムを２３℃で自然冷却後、１５ｍｍ幅の短冊状に切り出して試験片とし、この試験片を２３℃、５０％ＲＨの恒温室において引張試験機（株式会社エー・アンド・ディー製）を用いて、３００ｍｍ／分の速度で９０°剥離を行い、ヒートシール強度を測定した。 (Measurement of heat seal strength with sterile paper)
The sealing surface of the laminate film obtained above and the sealing surface of non-coated type sterile paper ("Tyvek 1059B" manufactured by Asahi DuPont Flashspan Products Co., Ltd.) are overlapped, and the heat sealing temperature is 140 ° C. and the sealing pressure is 0.2 MPa. , Heat-sealed under the condition of sealing time of 0.7 seconds. Next, the heat-sealed film was naturally cooled at 23 ° C., and then cut into strips having a width of 15 mm to obtain test pieces. The test pieces were subjected to a tensile tester (A & Co., Ltd.) in a thermostatic chamber at 23 ° C. and 50% RH. A 90 ° peeling was performed at a speed of 300 mm / min using a D.), and the heat seal strength was measured.
（滅菌紙でのヒートシール性の評価）
　上記で測定したヒートシール強度の結果から、下記の基準で紙容器でのヒートシール性を評価した。
　○：ヒートシール強度が３～９Ｎ／１５ｍｍのもの。
　×：ヒートシール強度が３Ｎ／１５ｍｍ未満又は９Ｎ／１５ｍｍを超えるもの。 (Evaluation of heat sealability with sterile paper)
From the results of the heat seal strength measured above, the heat seal property in the paper container was evaluated according to the following criteria.
◯: Heat seal strength of 3 to 9 N / 15 mm.
X: The heat seal strength is less than 3N / 15mm or more than 9N / 15mm.
（滅菌紙での開封性の評価）
　上記のヒートシール強度の測定時に作製した上記で得られたラミネートフィルムと滅菌紙とをヒートシールしたものと同じものを用いて、ラミネートフィルムと滅菌紙とを手で開封し、開封した際の開封感を確認し、下記の基準で紙容器での開封性を評価した。
　○：蓋材の剥離に要する力が一定で、円滑な剥離が容易である。
　×：蓋材の剥離に要する力が一定せず、剥離に円滑さを欠く。 (Evaluation of openability with sterile paper)
The laminated film and the sterilized paper were manually opened using the same heat-sealed laminate film and sterilized paper prepared at the time of measuring the heat-sealing strength, and opened when the package was opened. The feeling was confirmed, and the openability in a paper container was evaluated according to the following criteria.
◯: The force required for peeling the lid material is constant, and smooth peeling is easy.
X: The force required for peeling the lid material is not constant, and the peeling is not smooth.
（滅菌紙での剥離外観の評価）
　上記の開封性の評価で、ラミネートフィルムと滅菌紙とを開封した後のラミネートフィルム及び滅菌紙のシール部の外観を目視で観察し、剥離外観の評価として下記の基準で、膜残り・糸引き及び紙剥けを評価した。 (Evaluation of peeling appearance with sterile paper)
In the above evaluation of openability, the appearance of the sealed part of the laminated film and the sterilized paper after opening the laminated film and the sterilized paper was visually observed, and the film residue and stringing were evaluated according to the following criteria as the evaluation of the peeled appearance. And paper peeling was evaluated.
（滅菌紙での膜残り・糸引きの評価）
　○：膜残り、糸引きがすべてないもの。
　×：膜残り、糸引きの少なくとも一つあるもの。 (Evaluation of film residue and stringing with sterile paper)
◯: No film residue or stringing.
X: There is at least one remaining film and stringing.
（滅菌紙での紙剥けの評価）
　○：紙剥けがないもの。
　×：紙剥けがあるもの。
（耐衝撃性評価）
　実施例及び比較例にて得られたフィルムを０℃下に調整した恒温室内で４時間静置した試験片を準備した。各試験片にて、テスター産業製ＢＵ－３０２型フィルムインパクトテスターを用いて、振り子の先端に１．５インチのヘッドを取り付け、フィルムインパクト法による衝撃強度を測定した。
　○：衝撃強度が０．１０（Ｊ）以上
　×：衝撃強度が０．１０（Ｊ）未満 (Evaluation of peeling with sterile paper)
◯: No paper peeling.
×: Paper is peeled off.
(Impact resistance evaluation)
Specimens obtained by allowing the films obtained in Examples and Comparative Examples to stand in a thermostatic chamber adjusted to 0 ° C. for 4 hours were prepared. For each test piece, a 1.5-inch head was attached to the tip of the pendulum using a BU-302 type film impact tester manufactured by Tester Sangyo, and the impact strength by the film impact method was measured.
◯: Impact strength is 0.10 (J) or more ×: Impact strength is less than 0.10 (J)
（成膜性の評価）
　実施例、比較例で作成したフィルム作成時に、ゲル、穴の発生状況を確認した。
　○：穴の発生が１個／ｍ２以下。
　×：穴の発生が１個／ｍ２以下。 (Evaluation of film forming property)
During the production of the films prepared in Examples and Comparative Examples, the state of gel and hole generation was confirmed.
◯: The number of holes is 1 / m 2 or less.
X: The number of holes generated is 1 / m 2 or less.
　上記で得られた結果を表１及び２に示す。 The results obtained above are shown in Tables 1 and 2.
Figure JPOXMLDOC01-appb-I000001
Figure JPOXMLDOC01-appb-I000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　上記表から明らかなとおり、実施例１～５の本発明の積層フィルムは、紙系材料と生分解性樹脂等の樹脂材料とを複合化した包装材に対しても好適なヒートシール性と易開封性とを有し、包装用途に好適な剛性や成膜性、耐衝撃性等を有するものであった。 As is clear from the above table, the laminated films of the present invention of Examples 1 to 5 have heat-sealing properties and are easy to use even for a packaging material in which a paper-based material and a resin material such as a biodegradable resin are composited. It had openability, and had rigidity, film formation property, impact resistance, etc. suitable for packaging applications.

Claims (10)

  1. 　ヒートシール層（Ａ）と、前記ヒートシール層（Ａ）と直接積層される樹脂層（Ｂ）とを有する積層フィルムであって、
    　前記ヒートシール層（Ａ）がポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の少なくとも一種と、メルトフローレート（１９０℃、２１．１８Ｎ）が２～４０のポリエチレン系樹脂（ａ３）とを含有し、
    　前記樹脂層（Ｂ）が、ポリ乳酸系樹脂（ｂ１）、ポリブチレンサクシネート系樹脂（ｂ２）及びポリエチレン系樹脂（ｂ３）の少なくとも一種を主たる樹脂成分として含有することを特徴とする積層フィルム。     A laminated film having a heat-sealing layer (A) and a resin layer (B) directly laminated with the heat-sealing layer (A).
    The heat seal layer (A) is at least one of a polylactic acid resin (a1) and a polybutylene succinate resin (a2), and a polyethylene resin having a melt flow rate (190 ° C., 21.18N) of 2 to 40. Contains a3) and
    A laminated film characterized in that the resin layer (B) contains at least one of a polylactic acid-based resin (b1), a polybutylene succinate-based resin (b2), and a polyethylene-based resin (b3) as a main resin component.
  2. 　前記ヒートシール層（Ａ）中のポリ乳酸系樹脂（ａ１）及びポリブチレンサクシネート系樹脂（ａ２）の総含有量に対するポリエチレン系樹脂（ａ３）の含有量の比が、（ａ３）／（（ａ１）＋（ａ２））で表される質量比で、５０／５０～９０／１０である請求項１に記載の積層フィルム。 The ratio of the content of the polyethylene resin (a3) to the total content of the polylactic acid resin (a1) and the polybutylene succinate resin (a2) in the heat seal layer (A) is (a3) / ((a3) / ( The laminated film according to claim 1, which has a mass ratio represented by a1) + (a2)) and is 50/50 to 90/10.
  3. 　前記ヒートシール層（Ａ）中のポリエチレン系樹脂（ａ３）が低密度ポリエチレン及び直鎖低密度ポリエチレンの少なくとも一種である請求項１又は２に記載の積層フィルム。 The laminated film according to claim 1 or 2, wherein the polyethylene-based resin (a3) in the heat-sealing layer (A) is at least one of low-density polyethylene and linear low-density polyethylene.
  4. 　前記樹脂層（Ｂ）中のポリエチレン系樹脂（ｂ３）が、植物由来のバイオマスポリエチレンである請求項１～３のいずれかに記載の積層フィルム。 The laminated film according to any one of claims 1 to 3, wherein the polyethylene-based resin (b3) in the resin layer (B) is a plant-derived biomass polyethylene.
  5. 　前記ヒートシール層（Ａ）が凝集破壊により易開封性を有する易開封性ヒートシール層である請求項１～４のいずれかに記載の積層フィルム。 The laminated film according to any one of claims 1 to 4, wherein the heat-sealing layer (A) is an easily-opening heat-sealing layer having easy-opening properties due to cohesive failure.
  6. 　ヒートシール層（Ａ）の厚みが総厚みの１０～７０％であり、樹脂層（Ｂ）の厚みが総厚みの９０～３０％である請求項１～５のいずれかに記載の積層フィルム。 The laminated film according to any one of claims 1 to 5, wherein the thickness of the heat seal layer (A) is 10 to 70% of the total thickness, and the thickness of the resin layer (B) is 90 to 30% of the total thickness.
  7. 　厚みが１５～５０μｍである請求項１～６のいずれかに記載の積層フィルム。 The laminated film according to any one of claims 1 to 6, which has a thickness of 15 to 50 μm.
  8. 　請求項１～７のいずれかに記載の積層フィルムからなる包装材。 A packaging material made of the laminated film according to any one of claims 1 to 7.
  9. 　請求項１～７のいずれかに記載の積層フィルムからなる蓋材。 A lid material made of the laminated film according to any one of claims 1 to 7.
  10. 　請求項１～７のいずれかに記載の積層フィルムの前記ヒートシール層（Ａ）とは他方の表層に基材をラミネートしてなることを特徴とする蓋材。 A lid material characterized in that a base material is laminated on a surface layer opposite to the heat seal layer (A) of the laminated film according to any one of claims 1 to 7.
PCT/JP2020/023890 2019-07-03 2020-06-18 Layered film and lid WO2021002208A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023248809A1 (en) * 2022-06-23 2023-12-28 Dic株式会社 Biodegradable security seal film, lid member, and packaging member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007223201A (en) * 2006-02-24 2007-09-06 Dainippon Printing Co Ltd Package
JP2007320060A (en) * 2006-05-30 2007-12-13 Dainippon Printing Co Ltd Easy peel sealant
JP2013155343A (en) * 2012-01-31 2013-08-15 Dainippon Printing Co Ltd Polyethylene-based resin composition
JP2015231870A (en) * 2014-05-13 2015-12-24 凸版印刷株式会社 Lid material and packaging container using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007223201A (en) * 2006-02-24 2007-09-06 Dainippon Printing Co Ltd Package
JP2007320060A (en) * 2006-05-30 2007-12-13 Dainippon Printing Co Ltd Easy peel sealant
JP2013155343A (en) * 2012-01-31 2013-08-15 Dainippon Printing Co Ltd Polyethylene-based resin composition
JP2015231870A (en) * 2014-05-13 2015-12-24 凸版印刷株式会社 Lid material and packaging container using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023248809A1 (en) * 2022-06-23 2023-12-28 Dic株式会社 Biodegradable security seal film, lid member, and packaging member

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