KR20200130388A - Laminated film, packaging material, package, and manufacturing method of laminated film - Google Patents

Abstract

The laminated film 10 of the present invention comprises at least a base layer (A), a thermoplastic resin (B1), and a polymer-type antistatic agent (B2) (except for the thermoplastic resin (B1)). ) Formed by the antistatic layer (B) and the heat sealable layer (C) in this order, wherein the content of the polymeric antistatic agent (B2) in the antistatic layer (B) is the antistatic layer ( When the whole of B) is 100% by mass, it is 1% by mass or more and 10% by mass or less, and the antistatic layer (B) is formed by extrusion coating the resin composition (B3) on the base layer (A). Layer.

Description

Laminated film, packaging material, package, and manufacturing method of laminated film

The present invention relates to a laminated film, a packaging material, a package, and a method for producing a laminated film.

As a laminated film for packaging, a laminated film in which a heat-sealable layer composed of low-density polyethylene or the like is adhered to a base film is known.

As a technique related to such a laminated film, the one described in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2017-202584) is mentioned, for example.

In Patent Document 1, a film for pharmaceutical packaging consisting of a laminate of at least three layers of thermoplastic resin forming layers, comprising a first layer that is an innermost layer in contact with the medicine and consisting of an antistatic agent-free thermoplastic resin forming layer, and a polymeric antistatic agent in a single layer. The second layer consisting of a thermoplastic resin-forming layer containing a polymeric antistatic agent containing a weight% (however, 10<C<30), and the third layer or the third layer, which is the outermost layer composed of a thermoplastic resin-forming layer, to the outermost layer. A film for pharmaceutical packaging is described, wherein the laminate has a maximum of 0.01 mmol equivalent of a water-soluble alkali component per 5 g of a total of 1 cm 2 pieces.

Japanese Unexamined Patent Application Publication No. 2017-202584

The level of technology required for various properties of the packaging laminated film is gradually increasing. In the laminated film described in Patent Document 1, sufficient antistatic properties are not expressed unless a polymeric antistatic agent in an amount exceeding 10% by mass is contained in a single layer. Since the polymer type antistatic agent is generally expensive, if the content of the polymer type antistatic agent exceeds 10% by mass, it may not be practical from the viewpoint of price. Further, when the content of the polymeric antistatic agent is increased, the transparency of the obtained laminated film decreases, and the visibility of the contents may deteriorate in some cases. Therefore, there is a demand for a laminated film in which antistatic properties are exhibited at least in which the content of the polymeric antistatic agent in a single layer is sufficient.

The present invention has been made in view of the above circumstances, and provides a laminated film having excellent antistatic properties.

The inventors of the present invention repeated intensive examinations in order to achieve the above problems. As a result, by forming an antistatic layer containing a thermoplastic resin and a polymeric antistatic agent on the substrate layer by using an extrusion coating method, the dispersibility of the polymeric antistatic agent in the antistatic layer is improved, and as a result In addition, even when the content of the polymeric antistatic agent in a single layer was low, it was found that a laminated film excellent in antistatic properties was obtained, and the present invention was reached.

That is, according to the present invention, a method for producing a laminated film, a packaging material, a package, and a laminated film shown below is provided.

[One]

An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,

The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,

The laminated film in which the antistatic layer (B) is an extrusion-coated layer formed by extrusion coating the resin composition (B3) on the base layer (A).

[2]

An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,

The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,

A laminated film having a decay time of 1.0 second or less, as measured by the following method.

(Way)

In accordance with FEDERAL TEST METHOD 101C METHOD 4046 (US Federal Government Test Standard), using an electrostatic voltage attenuation characteristic measuring device, under the conditions of an applied voltage of 5000V, 23°C, and 50%RH, on the surface of the substrate layer (A) The voltage is applied until the large voltage reaches 5000 V, and then the time for the large voltage to decay from 5000 V to 500 V is measured, and this time is taken as the attenuation time.

[3]

In the laminated film according to the above [2],

A laminated film in which the antistatic layer (B) is an extrusion coating process layer.

[4]

In the laminated film according to any one of the above [1] to [3],

A laminated film having a melt flow rate (MFR) of 0.1 g/10 min or more and 20 g/10 min or less, measured under a load condition of 190°C and 2160 g according to JIS K7210:1999.

[5]

In the laminated film according to any one of [1] to [4] above,

The laminated film in which the thermoplastic resin (B1) contains polyolefin.

[6]

In the laminated film according to any one of the above [1] to [5],

A laminated film having a thickness of the antistatic layer (B) of 5 μm or more.

[7]

In the laminated film according to any one of [1] to [6],

The polymeric antistatic agent (B2) is a laminated film containing an ionomer resin.

[8]

In the laminated film according to [7] above,

The laminated film comprising at least one selected from the group consisting of an ethylene-based ionomer, a styrene-based ionomer, a perfluorocarbon-based ionomer, and a polyurethane-based ionomer.

[9]

In the laminated film according to [8],

A laminated film in which the metal ions constituting the ionomer resin contain at least one selected from potassium ions, lithium ions, and sodium ions.

[10]

In the laminated film according to any one of the above [1] to [9],

A laminated film in which the base layer (A) includes at least one selected from the group consisting of a polyester film, a nylon film, and a polyolefin film.

[11]

In the laminated film according to any one of the above [1] to [10],

The heat-sealing layer (C) is a laminated film containing a polyolefin.

[12]

A packaging material comprising at least a layer constituted of the laminated film according to any one of [1] to [11].

[13]

A package comprising the packaging material according to [12] above, and an article packaged by the packaging material.

[14]

An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,

The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,

A method for producing a laminated film comprising an extrusion step of forming the antistatic layer (B) on the base layer (A) by extrusion coating the resin composition (B3) on the base layer (A).

ADVANTAGE OF THE INVENTION According to this invention, a laminated film excellent in antistatic property can be provided.

The above-described objects, and other objects, features, and advantages are further clarified by preferred embodiments described below and the following drawings accompanying them.
1 is a cross-sectional view schematically showing an example of a structure of a laminated film of an embodiment according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, "X to Y" in a numerical range represents X or more and Y or less unless otherwise noted.

1. Laminated film and manufacturing method of laminated film

1 is a cross-sectional view schematically showing an example of a structure of a laminated film 10 of an embodiment according to the present invention.

The laminated film 10 according to this embodiment is a resin containing at least a base layer (A), a thermoplastic resin (B1), and a polymer-type antistatic agent (B2) (except for the thermoplastic resin (B1)) As a laminated film comprising the antistatic layer (B) formed of the composition (B3) and the heat sealable layer (C) in this order, the content of the polymeric antistatic agent (B2) in the antistatic layer (B) is When the whole of the protective layer (B) is 100% by mass, it is 1% by mass or more and 10% by mass or less, and the antistatic layer (B) is formed by extrusion coating a resin composition (B3) on the base layer (A). It is an extrusion coating processed layer.

In addition, the manufacturing method of the laminated film 10 according to the present embodiment includes at least a base layer (A), a thermoplastic resin (B1), and a polymer type antistatic agent (B2) (except for the thermoplastic resin (B1)). A method for producing a laminated film comprising an antistatic layer (B) formed of a resin composition (B3) containing (B3) and a heat sealable layer (C) in this order, comprising: a polymeric antistatic agent in the antistatic layer (B) The content of (B2) is 1% by mass or more and 10% by mass or less when the entire antistatic layer (B) is 100% by mass, and by extrusion coating the resin composition (B3) on the base layer (A), It includes an extrusion step of forming the antistatic layer (B) on the base layer (A). That is, the antistatic layer (B) of the laminated film 10 according to the present embodiment is an extrusion coating layer formed by an extrusion coating method.

As described above, in the laminated film described in Patent Document 1, sufficient antistatic properties are not exhibited unless a polymeric antistatic agent in an amount exceeding 10% by mass is contained in a single layer. Since the polymer type antistatic agent is generally expensive, if the content of the polymer type antistatic agent exceeds 10% by mass, it may not be practical from the viewpoint of price. Further, when the content of the polymeric antistatic agent is increased, the transparency of the obtained laminated film decreases, and the visibility of the contents may deteriorate in some cases. Therefore, there is a demand for a laminated film in which antistatic properties are exhibited at least in which the content of the polymeric antistatic agent in a single layer is sufficient.

The inventors of the present invention repeated intensive examinations in order to achieve the above problems. As a result, by forming an antistatic layer (B) containing a thermoplastic resin (B1) and a polymeric antistatic agent (B2) on the base layer (A) using an extrusion coating method, the antistatic layer (B) It was found that the dispersibility of the polymeric antistatic agent (B2) was improved, and as a result, a laminated film 10 having excellent antistatic properties was obtained even when the content of the polymeric antistatic agent (B2) in a single layer was low.

It is not clear why the dispersibility of the polymeric antistatic agent (B2) in the antistatic layer (B) becomes good when the extrusion coating method is used, but when the extrusion coating method is used, the inflation film used in Patent Document 1 It is conceivable that this is because the resin temperature during molding can be increased compared to a method or the like.

That is, according to the manufacturing method of the laminated film 10 according to the present embodiment, by extrusion coating the resin composition (B3) on the base layer (A), the antistatic layer (B) on the base layer (A) By including the extrusion step of forming ), the dispersibility of the polymeric antistatic agent (B2) in the obtained antistatic layer (B) becomes good, and the laminated film 10 having excellent antistatic properties can be obtained. Here, in the laminated film 10 according to the present embodiment, since the antistatic layer (B), which is an intermediate layer, contains a polymeric antistatic agent (B2), the polymeric antistatic agent (B2) bleeds on the outer surface of the film. You can restrain yourself from going out. In addition, since the laminated film 10 according to the present embodiment has excellent antistatic properties, dust and contents are heat-sealed when heat-sealed to form a bag, or when filling the bag with the contents. Adhering to the lamination (C) or the base layer (A) can be suppressed. As a result, the sealing property of the resulting packaging material or package can be improved, and the reliability of the packaging material can be improved.

Further, it is assumed that the morphology of the antistatic layer (B) having good dispersibility is different from that obtained by an inflation film forming method or the like, but it is difficult to specify the structure.

The manufacturing method of the laminated film 10 according to this embodiment is by extrusion coating a resin composition (B3) for forming an antistatic layer (B) on the substrate layer (A), And an extrusion step of forming the antistatic layer (B). The molding apparatus and molding conditions in this extrusion step are not particularly limited, and a conventionally known molding apparatus and molding conditions can be employed. As the molding apparatus, a T-die extruder or the like can be used. In addition, as molding conditions, molding conditions of a known extrusion coating method can be adopted.

In the manufacturing method of the laminated film 10 according to the present embodiment, the extrusion coating temperature in the extrusion step is appropriately set depending on the type and blending of the thermoplastic resin (B1) and the polymeric antistatic agent (B2). Although not particularly limited, from the viewpoint of further improving the dispersibility of the polymeric antistatic agent (B2) in the antistatic layer (B) and further improving the antistatic property of the obtained laminated film 10, 200 It is preferable that it is more than a degreeC, it is more preferable that it is 250 degreeC or more, and it is especially preferable that it is 280 degreeC or more.

The upper limit of the extrusion coating temperature in the extrusion step is not particularly limited, but is, for example, 350°C or less.

In the laminated film 10 according to the present embodiment, the attenuation time measured by the following method is preferably within 1.0 second, more preferably 0.5 second or less, and still more preferably 0.1 second or less. Thereby, the antistatic property of the laminated film 10 can be made even more favorable.

In the laminated film 10, the lower limit of the attenuation time of the laminated film 10 is not particularly limited, but is, for example, 0.0 seconds or more.

(Way)

In accordance with FEDERAL TEST METHOD 101C METHOD 4046 (US Federal Government Test Standard), using an electrostatic voltage attenuation characteristic measuring device, under the conditions of an applied voltage of 5000V, 23°C, and 50%RH, on the surface of the substrate layer (A) The voltage is applied until the large voltage reaches 5000 V, and then the time for the large voltage to decay from 5000 V to 500 V is measured, and this time is taken as the attenuation time.

In order to achieve such a decay time, the antistatic layer (B) is formed by extrusion coating while the content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less. It becomes especially important to do.

Hereinafter, each layer constituting the laminated film 10 according to the present embodiment will be described.

<Base layer (A)>

The base material layer (A) is a layer provided for the purpose of improving properties such as handling properties, mechanical properties, electrical conductivity, heat insulation properties, and heat resistance of the laminated film 10. As the base layer (A), for example, a nylon film, a polypropylene film, a polyolefin film such as a polyethylene film, a polyester film, a polyamide film, a polyimide film, a polyvinylidene chloride film, an ethylene/vinyl acetate copolymer film , Aluminum foil, aluminum vapor deposition film, paper, and the like. These may be used individually by 1 type, and may be used in combination of 2 or more types. These may be stretched uniaxially or biaxially.

Among these, at least one selected from the group consisting of a polyester film, a nylon film, and a polyolefin film is preferable from the viewpoint of excellent mechanical strength, pinhole resistance, and the like.

The thickness of the base layer (A) is preferably 1 µm or more and 200 µm or less, more preferably 3 µm or more and 100 µm or less, and still more preferably 5 µm or more and 80 µm or less from the viewpoint of obtaining good film properties.

The base layer (A) may be subjected to a surface treatment in order to improve the adhesiveness with other layers. Specifically, corona treatment, plasma treatment, anchor coat treatment, primer coat treatment, or the like may be performed.

<Antistatic layer (B)>

The antistatic layer (B) according to the present embodiment is formed from a resin composition (B3) containing a thermoplastic resin (B1) and a polymer type antistatic agent (B2) (except for the thermoplastic resin (B1)). do.

The content of the thermoplastic resin (B1) in the antistatic layer (B) is 99% by mass or less, preferably 98, from the viewpoint of improving the antistatic property when the whole of the antistatic layer (B) is 100% by mass. Mass% or less, more preferably 97 mass% or less, still more preferably 96 mass% or less, particularly preferably 95 mass% or less, to improve the transparency of the obtained laminated film 10 or to reduce the cost From the viewpoint, preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 91% by mass or more, particularly preferably 92% by mass or more, most preferably It is 94 mass% or more.

In addition, the content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less, preferably 2% by mass, when the whole of the antistatic layer (B) is 100% by mass. % Or more and 10% by mass or less, but from the viewpoint of further improving antistatic properties, it is preferably 3% by mass or more, more preferably 4% by mass or more, further preferably 5% by mass or more, and the obtained laminated film (10 From the viewpoint of improving the transparency of) or suppressing the cost, it is preferably 9% by mass or less, more preferably 8% by mass or less, and still more preferably 6% by mass or less.

The thickness of the antistatic layer (B) is, for example, 1 µm or more and 100 µm or less, preferably 3 µm or more and 80 µm or less, and particularly preferably 5 µm or more and 40 µm or less. From the viewpoint of extrusion coatability of the antistatic layer (B), the thickness of the antistatic layer (B) is preferably 5 µm or more. From the viewpoint of price, the thickness of the antistatic layer (B) is preferably 40 µm or less.

Examples of the thermoplastic resin (B1) according to the present embodiment include polyethylene such as high-density polyethylene, high-pressure low-density polyethylene, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ethylene-unsaturated carboxylic acid-based copolymers. , Ethylene/unsaturated carboxylic acid ester copolymer, ethylene/vinyl acetate copolymer (EVA), ethylene/vinyl alcohol copolymer, ethylene/α-olefin copolymer elastomer, polypropylene, propylene copolymer (other than propylene and propylene) polyolefins such as copolymers with α-olefins), polybutenes, and other olefin-based (co)polymers, and polymer blends thereof; Polyesters such as polyethylene terephthalate; Polyamides, such as 6-nylon and 6,6-nylon, etc. are mentioned. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, and the like.

Among these, the thermoplastic resin (B1) containing a polyolefin is excellent in the balance of adhesiveness, handling properties, cord workability, and price with the base layer (A) and the heat-sealing layer (C). Preferably, the group consisting of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ethylene-α-olefin copolymer elastomer, polypropylene and propylene-based copolymer (a copolymer of propylene and α-olefins other than propylene) It is more preferable to contain at least 1 type selected from.

In accordance with JIS K7210:1999, the melt flow rate (hereinafter also referred to as MFR) of the thermoplastic resin (B1) according to the present embodiment, measured under 190°C and 2160 g load conditions, is 0.1 g/10 min or more and 20 g/ It is preferably 10 minutes or less, more preferably 0.5 g/10 minutes or more and 15 g/10 minutes or less, and more preferably 1.0 g/10 minutes or more and 10 g/10 minutes or less. When the MFR is equal to or greater than the lower limit, the workability of the antistatic layer (B) can be further improved. If the MFR is less than the above upper limit, it becomes possible to apply a high shear force to the resin composition (B3) containing the thermoplastic resin (B1) and the polymeric antistatic agent (B2) in the extrusion coating process, and as a result, antistatic The dispersibility of the polymeric antistatic agent (B2) in the layer (B) can be further improved. Thereby, the laminated film 10 further excellent in antistatic properties can be obtained.

As the polymeric antistatic agent (B2) according to the present embodiment, for example, ionomer resin, polyethylene oxide, polypropylene oxide, polyethylene glycol, polyesteramide, polyether esteramide, polyether/polyolefin block copolymer ( Block copolymers of polyether-based blocks and polyolefin-based blocks) and quaternary ammonium salts such as polyethylene glycol methacrylate-based copolymers, and the like. These high molecular weight antistatic agents (B2) may be used alone or in combination of two or more.

Among these, an ionomer resin is preferable from the viewpoint of obtaining the laminated film 10 further excellent in antistatic properties.

Examples of the ionomer resin according to the present embodiment include ethylene-based ionomers, styrene-based ionomers, perfluorocarbon-based ionomers, and polyurethane-based ionomers. Among these, at least one selected from ethylene-based ionomers and styrene-based ionomers is preferable, and ethylene-based ionomers are more preferable.

Examples of the ethylene-based ionomer base resin include an ethylene-unsaturated carboxylic acid-based copolymer.

The ethylene-unsaturated carboxylic acid-based copolymer is a polymer obtained by copolymerizing at least ethylene and a monomer selected from unsaturated carboxylic acid as a copolymerization component, and if necessary, a monomer other than ethylene and unsaturated carboxylic acid may be copolymerized.

In the copolymer, any of a block copolymer, a random copolymer, and a graft copolymer may be used, but considering productivity, a graft copolymer of a binary random copolymer, a ternary random copolymer, and a binary random copolymer Or it is preferable to use a graft copolymer of a ternary random copolymer, more preferably a binary random copolymer or a ternary random copolymer.

The ethylene/unsaturated carboxylic acid-based copolymer is preferably at least one selected from the group consisting of ethylene/unsaturated carboxylic acid binary copolymer and ethylene/unsaturated carboxylic acid alkyl ester/unsaturated carboxylic acid terpolymer.

As an unsaturated carboxylic acid, for example, acrylic acid, methacrylic acid, ethacrylic acid, itaconic acid, itaconic anhydride, fumaric acid, crotonic acid, maleic acid, maleic anhydride, maleic acid monoester (monomethyl maleic acid, maleic acid Monoethyl, etc.), maleic anhydride monoester (monomethyl maleate anhydride, monoethyl maleate anhydride, etc.), and other unsaturated carboxylic acids or half esters having 4 to 8 carbon atoms.

Among these, the unsaturated carboxylic acid preferably contains at least one selected from acrylic acid and methacrylic acid from the viewpoint of productivity of the ethylene-unsaturated carboxylic acid-based copolymer. These unsaturated carboxylic acids may be used alone or in combination of two or more.

The ethylene-unsaturated carboxylic acid-based copolymer constituting the ethylene-based ionomer is a copolymer in which at least ethylene and an unsaturated carboxylic acid are copolymerized, and may be a ternary or more multi-component copolymer in which a third copolymerization component is copolymerized.

In the polypolymer, in addition to ethylene and (meth)acrylic acid copolymerizable with the ethylene, as a third copolymerization component, unsaturated carboxylic acid esters (e.g., methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, acrylic acid) (Meth)acrylate alkyl esters such as isooctyl, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, dimethyl maleate and diethyl maleate), vinyl esters (e.g., vinyl acetate, vinyl propionate, etc.) ), unsaturated hydrocarbons (e.g., propylene, butene, 1,3-butadiene, pentene, 1,3-pentadiene, 1-hexene, etc.), oxides such as vinyl sulfuric acid or vinyl nitric acid, halogen compounds (e.g., Vinyl chloride, vinyl fluoride, etc.), vinyl group-containing primary and secondary amine compounds, carbon monoxide, sulfur dioxide, and the like may be copolymerized.

Among these, as the third copolymerization component, an unsaturated carboxylic acid ester is preferable, and an alkyl (meth)acrylate (preferable carbon number of the alkyl moiety is 1 to 4) is more preferable.

The content ratio of the structural unit derived from the third copolymerization component in the ethylene/(meth)acrylic acid-based copolymer is preferably within a range of 25% by mass or less.

If the content ratio of the structural unit derived from the third copolymerization component is less than or equal to the above upper limit, it is preferable from the viewpoint of production and mixing.

In the ethylene-unsaturated carboxylic acid-based copolymer according to the present embodiment, the structural unit derived from ethylene is preferably 65% by mass or more and 95% by mass or less, and more preferably 75% by mass or more and 92% by mass or less. .

In the ethylene-unsaturated carboxylic acid-based copolymer according to the present embodiment, the structural unit derived from unsaturated carboxylic acid is preferably 5% by mass or more and 35% by mass or less, and more preferably 8% by mass or more and 25% by mass. Below.

Examples of the styrene-based ionomer base resin include styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene maleic acid copolymer, styrene fumaric acid copolymer, styrene maleic anhydride copolymer, and the like. I can. Among these, at least one selected from a styrene/acrylic acid copolymer and a styrene/methacrylic acid copolymer is preferable.

Examples of the metal ions constituting the ionomer resin according to the present embodiment include alkali metal ions such as lithium ions, potassium ions, and sodium ions; And polyvalent metal ions such as calcium ions, magnesium ions, zinc ions, aluminum ions, and barium ions. These metal ions may be used alone or in combination of two or more.

Among these, it is preferable to contain at least one type selected from potassium ions, lithium ions and sodium ions, more preferably potassium ions.

Among the ionomer resins, ionomer resins containing potassium ions as metal ions constituting the ionomer resin are preferred from the viewpoint of being recognized for use in food applications.

The degree of neutralization of the ionomer resin according to the present embodiment is not particularly limited, but from the viewpoint of further improving processability and moldability, 95% or less is preferable, and 90% or less is more preferable.

In addition, the neutralization degree of the ionomer resin according to the present embodiment is not particularly limited, but from the viewpoint of further improving workability and antistatic properties and heat resistance of the obtained laminated film 10, 10% or more is preferable, and 20 % Or more is more preferable, and 30% or more is more preferable.

The method for producing the ionomer resin is not particularly limited, and may be produced by a known method. In addition, the ionomer resin may be commercially available.

In this embodiment, according to JIS K7210:1999, it is preferable that the melt flow rate (MFR) of the ionomer resin is 0.01 g/10 min or more and 20 g/10 min or less, measured under 190°C and 2160 g load conditions. , 0.1 g/10 minutes or more and 10 g/10 minutes or less are more preferable, and 0.1 g/10 minutes or more and 5 g/10 minutes or less are particularly preferable. When the MFR is equal to or greater than the lower limit, the workability of the antistatic layer (B) can be further improved. If the MFR is less than the above upper limit, it becomes possible to apply a high shear force to the resin composition (B3) containing the thermoplastic resin (B1) and the polymeric antistatic agent (B2) in the extrusion coating process, and as a result, antistatic The dispersibility of the polymeric antistatic agent (B2) in the layer (B) can be further improved. Thereby, the laminated film 10 further excellent in antistatic properties can be obtained.

In the antistatic layer (B), components other than the thermoplastic resin (B1) and the polymeric antistatic agent (B2) can be contained within a range that does not impair the object of the present invention. Other components are not particularly limited, but for example, plasticizers, antioxidants, ultraviolet absorbers, antistatic agents other than polymer antistatic agents (B2), surfactants, coloring agents, light stabilizers, foaming agents, lubricants, crystal nucleating agents, crystallization accelerators , Crystallization retardant, catalyst deactivator, thermoplastic resin, thermosetting resin, inorganic filler, organic filler, impact improving agent, slip agent, crosslinking agent, crosslinking aid, tackifier, silane coupling agent, processing aid, release agent , A hydrolysis inhibitor, a heat-resistant stabilizer, an anti-blocking agent, an anti-fog agent, a flame retardant, a flame retardant aid, a light diffusion agent, an antibacterial agent, an anti-fog agent, a dispersant, or other resins. The other components may be used singly or in combination of two or more, but from the viewpoint of adhesiveness and transparency, it is preferable that the slip agent is substantially not included. Here, the "substantially free of a slip agent" indicates that the content of the slip agent is 0.1% by mass or less in the resin composition (B3) forming the antistatic layer (B).

<Heat sealing layer (C)>

The heat-sealable layer (C) is a layer for imparting heat-sealability to the laminated film 10 according to the present embodiment, and includes, for example, a thermoplastic resin (C1).

The thickness of the heat-sealing layer (C) is, for example, 1 µm or more and 300 µm or less, preferably 5 µm or more and 200 µm or less, and more preferably 10 µm or more and 150 µm or less.

Examples of the thermoplastic resin (C1) according to the present embodiment include polyethylene such as high-density polyethylene, high-pressure low-density polyethylene, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ethylene-unsaturated carboxylic acid-based copolymers. , Ethylene/vinyl acetate copolymer (EVA), ethylene/α-olefin copolymer elastomer, polypropylene, propylene copolymer (a copolymer of propylene and α-olefins other than propylene), polybutene, and other olefins And polyolefins such as (co)polymers and polymer blends thereof. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene, and the like.

Among these, from the viewpoint of excellent heat sealability, the thermoplastic resin (C1) preferably contains polyolefin, and low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene/α-olefin copolymer elastomer, polypropylene And at least one selected from the group consisting of propylene-based copolymers (copolymers of propylene and α-olefins other than propylene).

The content of the thermoplastic resin (C1) in the heat-sealing layer (C) according to the present embodiment is preferably 50% by mass or more and 100% by mass or less, when the whole of the heat-sealing layer (C) is 100% by mass, It is more preferably 70% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less, and particularly preferably 95% by mass or more and 100% by mass or less. Thereby, the balance of adhesiveness, heat sealing property, etc. with the antistatic layer (B) can be made better.

In the heat-sealing layer (C) according to the present embodiment, components other than the thermoplastic resin (C1) can be contained within a range that does not impair the object of the present invention. Other components are not particularly limited, but for example, plasticizers, antioxidants, ultraviolet absorbers, antistatic agents, surfactants, colorants, light stabilizers, foaming agents, lubricants, crystal nucleating agents, crystallization accelerators, crystallization retardants, catalyst deactivators, Thermoplastic resin other than thermoplastic resin (C1), thermosetting resin, inorganic filler, organic filler, impact improving agent, slip agent, crosslinking agent, crosslinking aid, tackifier, silane coupling agent, processing aid, release agent, hydrolysis inhibitor, heat-resistant stabilizer , Anti-blocking agents, anti-fogging agents, flame retardants, flame retardant aids, light diffusion agents, antibacterial agents, anti-fogging agents, dispersing agents, and other resins. Other components may be used singly or in combination of two or more.

<other floors>

The laminated film 10 according to the present embodiment may be composed of only three layers of a base layer (A), an antistatic layer (B) and a heat sealable layer (C), and the laminated film 10 has various functions. From the viewpoint of imparting a, layers other than the three layers (hereinafter, also referred to as other layers) may be provided. As the other layer, a foam layer, a metal layer, an inorganic substance layer, a gas barrier layer, a hard coat layer, an adhesive layer, an antireflection layer, an antifouling layer, an anchor coat layer, etc. are mentioned, for example. Other layers may be used alone, or may be used in combination of two or more layers.

<use>

The laminated film 10 according to the present embodiment can be suitably used as a packaging material used for packaging foods, pharmaceuticals, industrial products, daily necessities, cosmetics, etc., and is particularly suitably used as a food packaging material. I can.

2. Packing material

The packaging material according to the present embodiment includes at least a layer constituted by the laminated film 10 according to the present embodiment. In addition, the laminated film 10 according to the present embodiment may be used for a part of the packaging material according to the present embodiment, and the laminated film 10 according to the present embodiment may be used for the entire packaging material.

The shape of the packaging material according to the present embodiment is not particularly limited, and for example, a shape such as a sheet shape, a film shape, and a bag shape may be mentioned.

The form of the envelope shape is not particularly limited, and examples thereof include a three-way envelope, a four-way envelope, a pillow envelope, a gusset envelope, and a stick envelope.

The packaging material according to the present embodiment can be suitably used as a packaging material used for packaging foods, pharmaceuticals, industrial products, daily necessities, cosmetics, and the like, and can be particularly suitably used as a food packaging material.

3. Package

The packaging body according to the present embodiment includes a packaging material according to the present embodiment and an article packaged by the packaging material.

Examples of the article include food, pharmaceuticals, industrial articles, and daily necessities.

As described above, embodiments of the present invention have been described with reference to the drawings, but these are examples of the present invention, and various configurations other than the above may be adopted.

[Example]

Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples.

The details of the material used for production of the laminated film are as follows.

<Base layer (A)>

PET1 (polyethylene terephthalate film, thickness: 12㎛)

PET2 (polyethylene terephthalate film, thickness: 50㎛)

ONy (biaxially stretched nylon film, thickness: 15㎛)

OPP (biaxially stretched polypropylene film, thickness: 20㎛)

<Antistatic layer (B)>

(Thermoplastic resin (B1))

LDPE1: Low-density polyethylene (density:923kg/㎥, MFR:3.7g/10min)

LDPE2: Low-density polyethylene (density:917kg/㎥, MFR:7.2g/10min)

LDPE3: Low-density polyethylene (density:917kg/㎥, MFR:23g/10min)

<Polymer type antistatic agent (B2)>

IO-1: Ionomer of ethylene-methacrylic acid copolymer (ethylene content: 86% by mass, methacrylic acid content: 14% by mass, metal ion: potassium, degree of neutralization: 84%, density: 965 kg/m 3, MFR :0.8g/10min)

<Heat sealing layer (C)>

LLDPE1 (low density polyethylene film, thickness: 30㎛)

LLDPE2 (low density polyethylene film, thickness: 100㎛)

[Examples 1 to 9 and Comparative Example 1]

By extrusion coating a resin composition (B3) containing a thermoplastic resin (B1) and a polymeric antistatic agent (B2) in the ratio shown in Table 1 between the substrate layer (A) and the heat-sealing layer (C), The antistatic layer (B) was formed on (A), and the laminated film of the layer structure shown in Table 1 was obtained, respectively. The conditions of extrusion coating are as follows.

Extruder: 65mmφ extruder (L/D=28)

Extrusion Coating Temperature (Die Bottom Temperature): 305°C, Extrusion Coating Speed: 80m/min, Air Gap: 110mm

In addition, the surface of the base material layer (A) was previously subjected to an anchor coat treatment using an anchor coat agent.

Each of the following evaluations was performed about the obtained laminated film. The obtained results are shown in Table 1, respectively.

<Evaluation of antistatic properties>

About the obtained laminated film, it left to stand at 40 degreeC for 2 days, and the anchor coat agent was hardened. Next, the obtained laminated film was allowed to stand for 7 days in an atmosphere of 23°C and 50%RH, and then in accordance with FEDERAL TEST METHOD 101C METHOD 4046 (US Federal Government Test Standard), an electrostatic voltage attenuation characteristic measuring device (Electro-Tech Systems, Inc.: MODEL406D STATIC DECAY METER (manufactured by ETS) under the conditions of an applied voltage of 5000V, 23°C, and 50%RH, until a high voltage reaches 5000V on the surface of the substrate layer (A) side of the laminated film. After applying the voltage, the time (seconds) for the high voltage to decay from 5000 V to 500 V was measured, and the antistatic property of the laminated film was evaluated. In addition, the MD direction of the laminated film was measured.

[Table 1]

The laminated films of Examples 1 to 9 all had an attenuation time of 1.0 second or less, and exhibited excellent antistatic properties despite the low content of the polymeric antistatic agent contained in the single layer. In contrast, the laminated film of Comparative Example 1 had a large attenuation time and was inferior in antistatic properties.

This application claims priority based on Japanese Patent Application No. 2018-041427 for which it applied on March 8, 2018, and the entire disclosure of the disclosure is incorporated herein.

Claims (14)

An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,
The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,
The laminated film in which the antistatic layer (B) is an extrusion-coated layer formed by extrusion coating the resin composition (B3) on the base layer (A). An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,
The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,
A laminated film having a decay time of 1.0 second or less, as measured by the following method.
(Way)
In accordance with FEDERAL TEST METHOD 101C METHOD 4046 (US Federal Government Test Standard), using an electrostatic voltage attenuation characteristic measuring device, under the conditions of an applied voltage of 5000V, 23°C, and 50%RH, on the surface of the substrate layer (A) The voltage is applied until the large voltage reaches 5000 V, and then the time for the large voltage to decay from 5000 V to 500 V is measured, and this time is taken as the attenuation time. The method of claim 2,
A laminated film in which the antistatic layer (B) is an extrusion coating process layer. The method according to any one of claims 1 to 3,
A laminated film having a melt flow rate (MFR) of 0.1 g/10 min or more and 20 g/10 min or less, measured under a load condition of 190°C and 2160 g according to JIS K7210:1999. The method according to any one of claims 1 to 4,
The laminated film in which the thermoplastic resin (B1) contains polyolefin. The method according to any one of claims 1 to 5,
A laminated film having a thickness of the antistatic layer (B) of 5 μm or more. The method according to any one of claims 1 to 6,
The polymeric antistatic agent (B2) is a laminated film containing an ionomer resin. The method of claim 7,
The laminated film comprising at least one selected from the group consisting of an ethylene-based ionomer, a styrene-based ionomer, a perfluorocarbon-based ionomer, and a polyurethane-based ionomer. The method of claim 8,
A laminated film in which the metal ions constituting the ionomer resin contain at least one selected from potassium ions, lithium ions, and sodium ions. The method according to any one of claims 1 to 9,
A laminated film in which the base layer (A) comprises at least one selected from the group consisting of a polyester film, a nylon film, and a polyolefin film. The method according to any one of claims 1 to 10,
The heat-sealing layer (C) is a laminated film containing a polyolefin. A packaging material comprising at least a layer composed of the laminated film according to any one of claims 1 to 11. A package comprising the packaging material according to claim 12 and an article packaged by the packaging material. An antistatic layer (B) formed by a resin composition (B3) comprising at least a base layer (A) and a thermoplastic resin (B1) and a polymer-type antistatic agent (B2) (excluding the thermoplastic resin (B1)) ), and a heat-sealing layer (C) in this order,
The content of the polymeric antistatic agent (B2) in the antistatic layer (B) is 1% by mass or more and 10% by mass or less when the whole of the antistatic layer (B) is 100% by mass,
A method for producing a laminated film comprising an extrusion step of forming the antistatic layer (B) on the base layer (A) by extrusion coating the resin composition (B3) on the base layer (A).

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