Calcium carbonate-containing film

Abstract

To provide a new calcium carbonate-containing film which can be satisfactorily bonded to a base material, for example, a resin film used as the base material, with a small resin amount.SOLUTION: A calcium carbonate-containing film contains a thermoplastic resin and calcium carbonate, wherein a percentage content of the calcium carbonate is more than 60 mass% and 80 mass% or less with respect to the mass of the calcium carbonate-containing film, and the film satisfies at least one of the following (i) to (iii): (i) the thermoplastic resin is a polyethylene-based resin, and density of the polyethylene-based resin is 0.930 / cm3 or more and / or flexural elastic modulus thereof is 340 MP or less; (ii) a compatibilizer is further contained; and (iii) D50 measured by a laser diffraction method of the calcium carbonate is 4 μm or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a calcium carbonate-containing film. [Background technology]

[0002] Conventionally, plastic sheets have been widely used for packaging purposes. Packages made from such sheets have many advantages, such as excellent water resistance, and are therefore used as alternative materials to paper packaging containers. On the other hand, from an environmental standpoint, it is considered necessary to reduce the use of petroleum-based resources as much as possible. From this standpoint, calcium carbonate has been mixed into plastic sheets.

[0003] Patent Document 1 discloses a household garbage bag that is characterized in that 10% by weight of linear low-density polyethylene, 15% by weight of low-density polyethylene, and 75% by weight of calcium carbonate are mixed and stirred at high temperature after injecting a solvent, and then injection molded in a reduction molding machine to produce a resin composition, and then 30% by weight of this resin composition and 70% by weight of high-density polyethylene are mixed and stirred in a dryer at 80°C, and molded in a polyethylene blowing film molding machine.

[0004] Patent Document 2 discloses a sheet that is made of a resin composition containing a thermoplastic resin and inorganic particles in a ratio of 85:15 to 20:80 and further containing a polyolefin resin having a hydrophilic group, and that has an elastic modulus of 1,000 MPa or more.

[0005] Patent Document 3 discloses a polyethylene resin composition in which calcium carbonate is blended with a polyethylene resin, wherein at least a part of the calcium carbonate in the polyethylene resin composition is calcium carbonate having an average particle size of 0.1 to 5.0 μm derived from an EVA-based masterbatch containing calcium carbonate and an ethylene-vinyl acetate resin, and the proportion of calcium carbonate derived from the EVA-based masterbatch to the total content of calcium carbonate in the polyethylene resin composition is 30 mass% or more. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-114301 A [Patent Document 2] JP 2018-48229 A [Patent Document 3] Patent Publication No. 2022-6831 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention provides a novel calcium carbonate-containing film which requires a small amount of resin and can be well adhered to a substrate, for example, a resin film used as a substrate. [Means for solving the problem]

[0008] As a result of intensive research, the present inventors have found that the above problems can be solved by the following means, and have completed the present invention. That is, the present invention is as follows: <Aspect 1> A calcium carbonate-containing film that contains a thermoplastic resin and calcium carbonate and is intended to laminate a substrate using a dry lamination adhesive, The content of the calcium carbonate is more than 60% by mass and 80% by mass or less with respect to the mass of the calcium carbonate-containing film; and A calcium carbonate-containing film that satisfies at least one of the following (i) to (iii): (i) the thermoplastic resin has a density of 0.928 g / cm 3 or more, and / or a flexural modulus of elasticity of 330 MPa or more is contained in an amount of 25 mass% or more relative to the mass of the thermoplastic resin; (ii) further comprising a compatibilizer; and (iii) The calcium carbonate has a D50 of 4.5 μm or less as measured by a laser diffraction method. <Aspect 2> The calcium carbonate-containing film according to aspect 1, which satisfies at least the above (i). <Aspect 3> The calcium carbonate-containing film according to aspect 2, wherein the thermoplastic resin further contains a second polyethylene-based resin and is composed of the first and second polyethylene-based resins. <Aspect 4> The calcium carbonate-containing film according to aspect 1, which satisfies at least the above (ii). <Aspect 5> The calcium carbonate-containing film according to aspect 4, wherein the compatibilizer is a polyethylene ionomer. <Aspect 6> The calcium carbonate-containing film according to aspect 1, which satisfies at least the above (iii). <Aspect 7> The calcium carbonate-containing film according to any one of Aspects 1 to 6, which is an inflation film. <Embodiment 8> A calcium carbonate-containing laminate, A calcium carbonate-containing film according to any one of aspects 1 to 7, and another layer laminated on the calcium carbonate-containing film, The content of the calcium carbonate is more than 60% by mass and 80% by mass or less with respect to the mass of the calcium carbonate-containing laminate. Calcium carbonate-containing laminate. <Aspect 9> A sealant laminate comprising the calcium carbonate-containing film according to any one of Aspects 1 to 7, and a sealant layer fused to the calcium carbonate-containing film. <Aspect 10> A sealant laminate comprising the calcium carbonate-containing laminate according to aspect 8, and a sealant layer fused to the other layer of the calcium carbonate-containing laminate. Aspect 11: A packaging laminate comprising: A sealant laminate according to claim 9, a dry lamination adhesive layer, and a substrate layer, the base layer is adhered to the calcium carbonate-containing film via the dry lamination adhesive layer on the side of the calcium carbonate-containing film opposite to the sealant layer; and The content of the calcium carbonate is more than 50% by mass based on the mass of the packaging laminate. Packaging laminates. Effect of the Invention

[0009] According to the present invention, it is possible to provide a novel calcium carbonate-containing film which can be well adhered to a substrate, for example, a resin film used as a substrate, with a small amount of resin. [Brief description of the drawings]

[0010] [Figure 1] Fig. 1(a) is a side cross-sectional view of a calcium carbonate-containing film of the present invention, and Fig. 1(b) is a side cross-sectional view of a calcium carbonate-containing laminate of the present invention. [Diagram 2] This figure is a cross-sectional side view of the sealant laminate of the present invention. [Diagram 3] This figure is a cross-sectional side view of the packaging laminate of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] <Calcium carbonate-containing film> The calcium carbonate-containing film of the present invention is a calcium carbonate-containing film that contains a thermoplastic resin and calcium carbonate and is intended to laminate a substrate using a dry lamination adhesive, The content of the calcium carbonate is more than 60% by mass and 80% by mass or less with respect to the mass of the calcium carbonate-containing film; and A calcium carbonate-containing film that satisfies at least one of the following (i) to (iii): (i) the thermoplastic resin has a density of 0.928 / cm 3 and / or a flexural modulus of 330 MPa or less, the content of the first polyethylene resin being 25 mass% or more relative to the mass of the thermoplastic resin; (ii) further comprising a compatibilizer; and (iii) The calcium carbonate has a D50 of 4.5 μm or less as measured by a laser diffraction method.

[0012] The present inventors have found that, by configuring a calcium carbonate-containing film so as to satisfy at least one of the above (i) to (iii), it is possible to satisfactorily adhere the film to a resin film used as a substrate with a small amount of resin via a dry lamination adhesive.

[0013] The calcium carbonate-containing film 10 of the present invention can have a single-layer structure as shown in FIG. 1(a).

[0014] The calcium carbonate-containing film can be produced by kneading a resin composition constituting the film using, for example, a batch-type kneader such as a kneader, a Banbury mixer, a mixing roll, or a conical mixer, or a continuous kneader such as a twin-screw kneader, and then molding the kneaded resin into a film by an extrusion molding method such as an inflation method or a T-die method. In addition, in producing the calcium carbonate-containing film, film formation and lamination may be performed simultaneously by a co-extrusion method such as a multi-layer inflation method or a multi-layer T-die method.

[0015] Among them, when the calcium carbonate-containing film is produced by a multilayer inflation method, that is, when the calcium carbonate-containing film is an inflation film, good lamination strength can be obtained when a substrate is laminated using a dry lamination adhesive. Without wishing to be bound by theory, this is thought to be because when the resin composition is extruded into a film shape from a ring-shaped die, it is immediately cooled, thereby preventing calcium carbonate from being exposed to the surface.

[0016] The calcium carbonate-containing film is a layer which contains a thermoplastic resin and calcium carbonate and is used to laminate a substrate using a dry lamination adhesive, more specifically, a layer which satisfies at least one of the above (i) to (iii).

[0017] The calcium carbonate content in the calcium carbonate-containing film is preferably more than 60% by mass, 65% by mass or more, or 70% by mass or more, from the viewpoint of increasing the calcium carbonate content when a packaging laminate is obtained, thereby reducing the resin content. This content may be 80% by mass or less, 75% by mass or less, or 73% by mass or less.

[0018] The thickness of the calcium carbonate-containing film is not particularly limited. When the calcium carbonate-containing film of the present invention is composed of only the first layer, the thickness of the calcium carbonate-containing film may be, for example, 5 μm or more, 10 μm or more, 15 μm or more, 20 μm or more, 30 μm or more, or 35 μm or more, and may be 100 μm or less, 90 μm or less, 80 μm or less, 70 μm or less, 60 μm or less, 50 μm or less, or 45 μm or less.

[0019] The thickness of the calcium carbonate-containing film may be, for example, 1 μm or more, 3 μm or more, 5 μm or more, 7 μm or more, or 9 μm or more, and may be 20 μm or less, 15 μm or less, or 12 μm or less.

[0020] Each component of the present invention will now be described.

[0021] <Thermoplastic resin> As the thermoplastic resin, for example, a polyolefin resin such as a polyethylene resin or a polypropylene resin can be used.

[0022] The polyethylene resin is a resin that contains more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of ethylene group repeating units in the main chain of the polymer, and is, for example, selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), derivatives thereof, and mixtures thereof.

[0023] The polypropylene-based resin is a resin that contains more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of propylene group repeating units in the polymer main chain, and examples thereof include polypropylene (PP) homopolymer, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, acid-modified polypropylene, and derivatives thereof, and mixtures thereof.

[0024] In particular, when the thermoplastic resin is a polyethylene resin, the density of the polyethylene resin is 0.910 g / cm 3 More than 0.915g / cm 3 More than 0.920g / cm 3 More than 0.925g / cm 3 More than 0.928g / cm 3 More than 0.930g / cm 3 or more than 0.933g / cm 3 In particular, the density may be 0.928 g / cm 3 From the viewpoint of lamination strength with the base layer, it is preferable that the density is 0.950 g / cm or more. 3 Below, 0.945g / cm 3 or less than 0.940g / cm 3 It may be the following:

[0025] In addition, when the thermoplastic resin is a polyethylene-based resin, the flexural modulus of the polyethylene-based resin according to JIS K7171:2016 may be 120 MPa or more, 130 MPa or more, 140 MPa or more, 150 MPa or more, 160 MPa or more, 170 MPa or more, 180 MPa or more, 190 MPa or more, 200 MPa or more, 220 MPa or more, 250 MPa or more, 280 MPa or more, 300 MPa or more, 330 MPa or more, 340 MPa or more, 350 MPa or more, 360 MPa or more, 370 MPa or more, 380 MPa or more, 390 MPa or more, or 400 MPa or more. Among them, when the flexural modulus is 330 MPa or more, it is preferable from the viewpoint of the laminate strength with the base material layer. This flexural modulus may be 1000 MPa or less, 900 MPa or less, 800 MPa or less, 700 MPa or less, 600 MPa or less, 500 MPa or less, or 450 MPa or less.

[0026] It is preferable that the thermoplastic resin contains a first polyethylene resin from the viewpoint of improving the lamination strength when the substrate is laminated using a dry lamination adhesive. Here, in the present invention, the "first polyethylene resin" is a polyethylene resin that satisfies the above condition (i), i.e., a polyethylene resin having a density of 0.928 g / cm. 3 or more, and / or a flexural modulus of elasticity of 330 MPa or more.

[0027] It is considered that the above-mentioned density and flexural modulus of the first polyethylene resin make it easier for calcium carbonate particles to be trapped in the resin, thereby reducing the number of calcium carbonate particles exposed on the surface, and improving the laminate strength when a substrate is laminated using a dry lamination adhesive.

[0028] The content of the first polyethylene resin is 25% by mass or more, 30% by mass or more, 33% by mass or more, or 35% by mass or more, relative to the mass of the thermoplastic resin, so that the above-mentioned effect can be obtained. This content may be 100% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, 50% by mass or less, 45% by mass or less, or 40% by mass or less.

[0029] The thermoplastic resin may further contain a second polyethylene resin and may be composed of the first and second polyethylene resins. In this case, the second polyethylene resin does not need to have the above density and flexural modulus, and may have a density of, for example, 0.928 g / cm 3 and a flexural modulus of elasticity of less than 330 MPa.

[0030] <Calcium carbonate> As the calcium carbonate, commercially available calcium carbonate can be used.

[0031] In particular, when calcium carbonate having a D50 of 4.5 μm or less is used as calcium carbonate, the heat seal strength can be improved. Here, in this specification, D50 means the median diameter (D50) calculated on a volume basis by a laser diffraction / scattering method.

[0032] It is considered that calcium carbonate having the above D50 has few particles of a size that is easily exposed on the surface of a calcium carbonate-containing film, and therefore few particles are exposed on the surface. This is considered to result in good lamination strength when a substrate is laminated using the dry lamination adhesive.

[0033] The D50 may be 4.3 μm or less, 4.1 μm or less, 4.0 μm or less, 3.8 μm or less, 3.5 μm or less, 3.3 μm or less, 3.1 μm or less, 3.0 μm or less, 2.8 μm or less, 2.5 μm or less, 2.3 μm or less, 2.0 μm or less, or 1.8 μm or less, and may be 0.5 μm or more, 0.7 μm or more, 1.0 μm or more, 1.2 μm or more, or 1.5 μm or more.

[0034] The specific surface area of ​​calcium carbonate is 11,000 m 2 / g or more, 11,500m 2 / g or more, or 11,700m 2 / g or more, and 2 / g or less, 45,000m 2 / g or less, 40,000m 2 / g or less, 35,000m 2 / g or less, 30,000m 2 / g or less, 28,000m 2 / g or less, 25,000m 2 / g or less, or 23,000m 2 The specific surface area can be measured by an air permeability method.

[0035] <Compatibilizer> As the compatibilizer, a commercially available compatibilizer can be used. Although not wishing to be bound by theory, it is believed that the presence of the compatibilizer allows calcium carbonate to be well dispersed in the thermoplastic resin, and as a result, calcium carbonate is less likely to be exposed on the surface of the calcium carbonate-containing film, thereby obtaining good adhesion with the dry lamination adhesive.

[0036] As the compatibilizer, a substance having affinity with both the thermoplastic resin and the metal compound, particularly the metal oxide, can be used.

[0037] In particular, when the thermoplastic resin is composed of a polyethylene-based resin, it is preferable for the compatibilizer to contain a polyethylene-based resin from the viewpoint of obtaining the above-mentioned effect, and it is even more preferable to use a polyethylene-based ionomer.

[0038] <Calcium carbonate-containing laminate> As shown in Fig. 1(b), a calcium carbonate-containing laminate 20 may have the above-mentioned calcium carbonate-containing film 10 and another layer 22 laminated on the calcium carbonate-containing film 10. The content of calcium carbonate is more than 60 mass% and 80 mass% or less with respect to the mass of the calcium carbonate-containing laminate.

[0039] In this case, the other layer 22 may be a layer containing a thermoplastic resin and calcium carbonate, where the other layer 22 is a layer separate from the layer for laminating the substrate using a dry lamination adhesive.

[0040] The calcium carbonate content in the calcium carbonate-containing laminate is preferably more than 60% by mass, 65% by mass or more, or 70% by mass or more, based on the mass of the calcium carbonate-containing laminate, from the viewpoint of increasing the calcium carbonate content when a packaging laminate is obtained, thereby reducing the resin content. This content may be 80% by mass or less, 75% by mass or less, or 73% by mass or less.

[0041] The types and contents of the thermoplastic resin and calcium carbonate of the other layers can be referred to the description regarding the calcium carbonate-containing film, and may be the same as or different from those of the calcium carbonate-containing film.

[0042] The thickness of the other layers is not particularly limited, and the description regarding the calcium carbonate-containing film can be referred to; however, from the viewpoint of increasing the calcium carbonate content when a packaging laminate is obtained and thereby reducing the resin content, the thickness of the other layers is preferably 100% or more, 150% or more, 200% or more, 250% or more, 300% or more, 350% or more, or 380% or more of the thickness of the calcium carbonate-containing film.

[0043] <Sealant laminate> In one embodiment, the sealant laminate 30 of the present invention has the above-mentioned calcium carbonate-containing film 10 and a sealant layer 32 fused to the calcium carbonate-containing film 10.

[0044] In another embodiment, the sealant laminate 30 of the present invention comprises a calcium carbonate-containing laminate 20 and a sealant layer 32 fused to the other layers 22 of the calcium carbonate-containing laminate 20 .

[0045] The sealant laminate can be produced by the method mentioned for the calcium carbonate-containing film. In particular, it can be produced integrally with the calcium carbonate-containing film by a coextrusion method such as a multi-layer inflation method or a multi-layer T-die method.

[0046] In particular, when the sealant laminate is produced by a multilayer inflation method, i.e., when the sealant laminate is an inflation film, good lamination strength can be obtained when a substrate is laminated using a dry lamination adhesive.

[0047] <Sealant layer> The sealant layer contains a sealant resin and can be the layer located on the content side when the bag is made into a packaging bag.

[0048] As the sealant resin, the thermoplastic resins mentioned in relation to the calcium carbonate-containing film can be used, and in particular, the sealant resin may be the same type of resin as the thermoplastic resin or a different type of resin. For example, both the sealant resin and the thermoplastic resin may be polyethylene-based resins.

[0049] The calcium carbonate content in the sealant layer is lower than the calcium carbonate content in the calcium carbonate-containing film, and is particularly preferably 1 / 5 or less, 1 / 10 or less, 1 / 15 or less, 1 / 20 or less, 1 / 30 or less, 1 / 40 or less, or 1 / 50 or less of the calcium carbonate content in the calcium carbonate-containing film, or is 0 mass%, from the viewpoint of obtaining sufficient heat seal strength.

[0050] The thickness of the sealant layer is preferably 5 μm or more, 7 μm or more, or 9 μm or more from the viewpoint of suitability for bag making. The thickness is preferably 20 μm or less, 17 μm or less, 15 μm or less, or 12 μm or less from the viewpoint of increasing the content of calcium carbonate in the entire packaging laminate.

[0051] The thickness of the sealant layer may be 5% or more, 7% or more, or 10% or more, and may be 25% or less, 22% or less, 20% or less, 15% or less, or 13% or less of the total thickness of the sealant laminate.

[0052] <<Packaging laminate>> As shown in Figs. 3(a) and (b), the packaging laminate 40 of the present invention has the above-mentioned sealant laminate 30, a dry laminate adhesive layer 42, and a substrate layer 44, the base layer 44 is adhered to the calcium carbonate-containing film 10 via the dry lamination adhesive layer 42 on the side of the calcium carbonate-containing film 10 opposite to the sealant layer 32; and The content of the calcium carbonate is more than 50 mass % based on the mass of the packaging laminate 40 .

[0053] The calcium carbonate content in the packaging laminate is preferably more than 50% by mass, 55% by mass or more, or 57% by mass or more, based on the mass of the packaging laminate, from the viewpoint of increasing the calcium carbonate content when the packaging laminate is obtained and thereby reducing the resin content. This content may be 75% by mass or less, 70% by mass or less, 65% by mass or less, or 60% by mass or less.

[0054] Dry laminate adhesive layer As the dry laminate adhesive layer, for example, a two-liquid curing type dry laminate adhesive can be used.

[0055] <Base material layer> The substrate layer may be composed of a thermoplastic resin having excellent impact resistance, abrasion resistance, etc., such as a vinyl resin, a polyester resin, a polyamide resin, a polypropylene resin, etc. The substrate layer may be a single layer or a laminate.

[0056] Examples of vinyl resins include polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polychlorotrifluoroethylene, polytetrafluoroethylene, and polyacrylonitrile (PAN).

[0057] Examples of polyester resins include polyethylene terephthalate (PET) and polybutylene terephthalate.

[0058] Examples of polyamide resins include nylons such as Nylon (registered trademark) 6 and Nylon MXD6.

[0059] As the polypropylene-based resin, the resins mentioned in relation to the calcium carbonate-containing film of the sealant laminate can be used.

[0060] The thickness of the base material layer is preferably 7 μm or more, or 10 μm or more, from the viewpoint of the mechanical strength of the packaging laminate, and is preferably 55 μm or less, 50 μm or less, 45 μm or less, 40 μm or less, 35 μm or less, 30 μm or less, 25 μm or less, 20 μm or less, or 15 μm or less, from the viewpoint of increasing the calcium carbonate content in the entire packaging laminate.

[0061] The resin constituting the base layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0062] The base layer is preferably made of a preformed film. The film to be the base layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among them, a biaxially stretched film is preferable.

[0063] Other Layers The packaging laminate of the present invention may have other optional layers. As the other layers, a barrier layer, etc. may be used. Between the base layer and the other layers, an adhesive layer, an anchor coat layer, etc. may be present.

[0064] As the adhesive layer, for example, a dry lamination adhesive, a hot lamination adhesive, or the like can be used.

[0065] The barrier layer may be made of a material capable of preventing moisture, organic gases, and inorganic gases from penetrating into the gas absorbing layer from the outside. Examples of the barrier layer include a single metal foil layer such as copper foil or aluminum foil, an alloy foil layer such as stainless steel foil, an inorganic vapor deposition film such as a silica vapor deposition film, an alumina vapor deposition film, or a silica-alumina binary vapor deposition film, or an organic coating film such as a polyvinylidene chloride coating film, a polychlorotrifluoroethylene coating film, or a polyvinylidene fluoride coating film.

[0066] When an inorganic vapor deposition film or an organic coating film is used as the barrier layer, the thickness of the barrier layer is preferably 100 nm or more, 200 nm or more, 300 nm or more, 500 nm or more, 700 nm or more, or 1 μm or more from the viewpoint of ensuring strength and barrier properties, and is preferably 5 μm or less, 4 μm or less, 3 μm or less, or 2 μm or less from the viewpoints of reducing the overall thickness of the packaging laminate and reducing the resin content in the entire packaging laminate.

[0067] When a metal foil layer or a barrier resin layer is used as the barrier layer, the thickness of the barrier layer is preferably 7 μm or more, 10 μm or more, or 15 μm or more from the viewpoint of ensuring strength and barrier properties, and is preferably 50 μm or less, 45 μm or less, 40 μm or less, or 35 μm or less from the viewpoint of reducing the thickness of the entire packaging laminate. EXAMPLES

[0068] The present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to these.

[0069] <<Preparation of Laminated Packaging Body>> Comparative Example 1 A two-kind, three-layer sealant laminate having a first layer having a thickness of 10 μm, a second layer having a thickness of 40 μm, and a sealant layer having a thickness of 10 μm was obtained by a coextrusion inflation method using an inflation molding machine. The first layer corresponds to the calcium carbonate-containing film of the present invention, and the second layer corresponds to another layer.

[0070] The first and second layers are made of 90 parts by mass of a master batch containing 80% by mass of calcium carbonate A (D50: 5.2 μm, specific surface area 12,000) and 20% by mass of polyethylene, and 10 parts by mass of linear low-density polyethylene (PE1, density 0.925 g / cm 3 A resin composition having a kneaded strength of 20 N and a flexural modulus of 320 MPa was used. PE1 was used alone as the sealant layer.

[0071] Next, a 15 μm nylon film as a base layer and the first layer of the obtained sealant laminate were laminated by dry lamination to obtain the packaging laminate of Example 1. In the dry lamination, a urethane-based two-component dry lamination adhesive was used.

[0072] Examples 1 to 5 Packaging laminates of Examples 1 to 5 were obtained in the same manner as in Comparative Example 1, except that the first and second layers and the sealant layer were changed to the configurations shown in Table 1. The compatibilizer contained in the "compatible MB" shown in Table 1 is a polyethylene ionomer whose metal ion is zinc.

[0073] In all of the obtained Examples and Comparative Examples, the calcium carbonate contents in the sealant laminate (without a base layer) and the packaging laminate (with a base layer) were 67% by mass and 58% by mass, respectively.

[0074] <Evaluation of Laminate Strength> The laminate strength between the base layer and the first layer of each packaging laminate was measured by T-peel (90 degree peel) under the conditions of a width of 15 mm, a chuck distance of 50 mm, and a pulling speed of 300 mm / min in accordance with JIS K6854-3: 1999. The same measurement was performed five times, and the average value was taken as the laminate strength.

[0075] Table 1 shows the configurations and evaluation results of the examples and comparative examples.

[0076] [Table 1]

[0077] From Table 1, it can be seen that the packaging laminates of Examples 1 to 5 using a calcium carbonate-containing film, in which the surface for laminating a substrate using a dry lamination adhesive is composed of a layer satisfying at least one of the following (i) to (iii), have good lamination strength: (i) the thermoplastic resin has a density of 0.928 g / cm 3 or more, and / or a flexural modulus of elasticity of 330 MPa or more is contained in an amount of 25 mass% or more relative to the mass of the thermoplastic resin; (ii) further comprising a compatibilizer; and (iii) The calcium carbonate has a D50 of 4.5 μm or less as measured by a laser diffraction method. [Explanation of symbols]

[0078] 10. Calcium carbonate-containing film 20 Calcium carbonate-containing laminate 22 Other layers 30 Sealant laminate 32 Sealant layer 40 Packaging laminate 42 Dry Laminate Adhesive Layer 44 Base material layer

Claims

1. A calcium carbonate-containing film comprising a thermoplastic resin and calcium carbonate, and intended for laminating a substrate using a dry lamination adhesive; The content of the calcium carbonate is more than 60% by mass and 80% by mass or less with respect to the mass of the calcium carbonate-containing film; and A calcium carbonate-containing film that satisfies at least one of the following (i) to (iii): (i) The thermoplastic resin has a density of 0.928 g / cm ３ and / or a flexural modulus of 330 MPa or more is contained in an amount of 25 mass% or more relative to the mass of the thermoplastic resin; (ii) further comprising a compatibilizer; and (iii) The calcium carbonate has a D50 of 4.5 μm or less as measured by a laser diffraction method.

2. The calcium carbonate-containing film according to claim 1 , which satisfies at least (i).

3. 3. The calcium carbonate-containing film according to claim 2, wherein the thermoplastic resin further comprises a second polyethylene resin, and the thermoplastic resin is composed of the first and second polyethylene resins.

4. The calcium carbonate-containing film according to claim 1 , which satisfies at least (ii).

5. 5. The calcium carbonate-containing film according to claim 4, wherein the compatibilizer is a polyethylene-based ionomer.

6. The calcium carbonate-containing film according to claim 1 , which satisfies at least (iii).

7. The calcium carbonate-containing film according to claim 1 or 2, which is an inflation film.

8. A calcium carbonate-containing laminate, A film comprising the calcium carbonate-containing film according to claim 1 or 2 and another layer laminated on the calcium carbonate-containing film, The content of the calcium carbonate is more than 60% by mass and not more than 80% by mass with respect to the mass of the calcium carbonate-containing laminate. Calcium carbonate-containing laminate.

9. 3. A sealant laminate comprising the calcium carbonate-containing film according to claim 1 or 2, and a sealant layer fused to the calcium carbonate-containing film.

10. A sealant laminate comprising: the calcium carbonate-containing laminate according to claim 8; and a sealant layer fused to the other layer of the calcium carbonate-containing laminate.

11. A packaging laminate comprising: A sealant laminate according to claim 9, a dry lamination adhesive layer, and a substrate layer, the base layer is adhered to the calcium carbonate-containing film via the dry lamination adhesive layer on the side of the calcium carbonate-containing film opposite to the sealant layer; and The content of the calcium carbonate is more than 50% by mass based on the mass of the packaging laminate. Packaging laminates.

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