WO2020195713A1 - 積層体、包装体、フレキシブルコンテナ内袋及びフレキシブルコンテナ - Google Patents
積層体、包装体、フレキシブルコンテナ内袋及びフレキシブルコンテナ Download PDFInfo
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- WO2020195713A1 WO2020195713A1 PCT/JP2020/009709 JP2020009709W WO2020195713A1 WO 2020195713 A1 WO2020195713 A1 WO 2020195713A1 JP 2020009709 W JP2020009709 W JP 2020009709W WO 2020195713 A1 WO2020195713 A1 WO 2020195713A1
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- resin layer
- laminate
- mass
- ethylene
- less
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Classifications
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- 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
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- 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
- B65D88/00—Large containers
- B65D88/16—Large containers flexible
- B65D88/22—Large containers flexible specially adapted for transport
-
- 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
- B32B2323/00—Polyalkenes
- B32B2323/04—Polyethylene
- B32B2323/046—LDPE, i.e. low density polyethylene
Definitions
- the present disclosure relates to laminates, packages, flexible container inner bags and flexible containers.
- polymer materials are widely used because of their light weight, high strength, and ease of processing.
- a package made of a polymer material is easily charged, and dust in the air may adhere to the package at each stage of storage, transportation, and use, and the outer surface may be contaminated.
- the contents may adhere to the inner surface to spoil the appearance or deteriorate the quality of the contents.
- the electrical insulation is large, static electricity is likely to be accumulated inside, and there is a concern that the static electricity may cause a disaster such as ignition of the contents.
- Japanese Patent Application Laid-Open No. 2003-226320 describes a container in which a surfactant is blended with a polymer material and the surface resistivity is controlled within a specific range. It is disclosed.
- Japanese Unexamined Patent Publication No. 2003-226320 studies the suppression of charge in a container made of a single-layer polymer material.
- the container is composed of a plurality of layers, the static electricity charged in the contents cannot be sufficiently dissipated to the outside of the container due to reasons such as poor conductivity between the outer layer and the inner layer, and the inside of the container cannot be sufficiently dissipated. Static electricity may accumulate. As a result, the ignitable discharge phenomenon having a large discharge energy may not be sufficiently suppressed.
- a laminate capable of producing a package in which static electricity does not easily accumulate inside, and a package in which static electricity does not easily accumulate inside, a flexible container inner bag and a flexible container.
- a resin layer A, a resin layer B, and a resin layer C are provided at least.
- the resin layer B contains potassium ionomer, which is an ethylene / unsaturated carboxylic acid copolymer, in an amount of 50% by mass or more of the entire resin layer B.
- the resin layer C is a laminate containing an ethylene / unsaturated carboxylic acid copolymer potassium ionomer in an amount of more than 10% by mass and less than 50% by mass of the entire resin layer C.
- ⁇ 3> The laminate according to ⁇ 1> or ⁇ 2>, wherein the resin layer A, the resin layer B, and the resin layer C are arranged in this order.
- ⁇ 4> In an environment of 23 ° C. and a relative humidity of 50%, when a voltage of 100 V is applied to the laminate for 30 seconds, the surface resistivity of the surface of the laminate opposite to the resin layer A is 1.
- ⁇ 5> The laminate according to any one of ⁇ 1> to ⁇ 4>, wherein the 1% attenuation time at an applied voltage of + 5000 V measured in an environment of 23 ° C.
- the resin layer B contains two or more kinds of ethylene / unsaturated carboxylic acid copolymer potassium ionomers in which the difference between the maximum acid content and the minimum acid content is 2% by mass to 20% by mass, and the potassium of the potassium ionomer.
- the resin layer A contains an olefin polymer.
- ⁇ 8> The laminate according to any one of ⁇ 1> to ⁇ 7>, wherein the resin layer A contains a linear low-density polyethylene.
- Laminated body. ⁇ 11> In accordance with IEC 61340-4-4 (2005) and JIS C 61340-4-4 (2009), a laminate is used in an environment of 23 ° C.
- the laminate according to any one of ⁇ 1> to ⁇ 10>, wherein the voltage is increased at a rate of 0.3 kV per second, and the voltage when dielectric breakdown occurs is less than 4 kV. .. ⁇ 12> A package containing the laminate according to any one of ⁇ 1> to ⁇ 11>, wherein the resin layer A is arranged inside. ⁇ 13> The package according to ⁇ 12>, further comprising an outer bag arranged on the outside of the laminated body.
- an object of the present disclosure is a laminate capable of producing a package in which static electricity does not easily accumulate inside, a package in which static electricity does not easily accumulate inside, a flexible container inner bag, and the like. Flexible containers are provided.
- the numerical range indicated by using "-" indicates a range including the numerical values before and after "-" as the minimum value and the maximum value, respectively.
- the amount of each component in the composition means the total amount of the plurality of substances present in the composition, unless otherwise specified, when a plurality of substances corresponding to each component are present in the composition. To do.
- the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. , May be replaced with the values shown in the examples.
- the laminate of the present disclosure includes at least a resin layer A, a resin layer B, and a resin layer C, and the resin layer B contains potassium ionomer of an ethylene / unsaturated carboxylic acid copolymer in an amount of 50% by mass of the entire resin layer B.
- the resin layer C is a laminate containing the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in an amount of more than 10% by mass and less than 50% by mass of the entire resin layer C.
- the dielectric breakdown voltage of the laminate having the above structure is sufficiently small, and the package produced by using this laminate has the insulation state easily destroyed and the static electricity accumulated inside. Was found to be able to escape to the outside. That is, the package produced by using the laminate of the present disclosure is excellent in safety because static electricity is less likely to be accumulated inside.
- the laminate of the present disclosure exerts a sufficient effect even if it does not contain an antistatic agent such as a surfactant or a conductive material such as carbon black. Therefore, for example, it is possible to prevent the antistatic agent from bleeding out to the surface of the laminate and to prevent the flexibility and transparency from being lowered due to the blending of the conductive material.
- an antistatic agent such as a surfactant or a conductive material such as carbon black. Therefore, for example, it is possible to prevent the antistatic agent from bleeding out to the surface of the laminate and to prevent the flexibility and transparency from being lowered due to the blending of the conductive material.
- the ionomer in the present disclosure has a structure in which some or all of the carboxylic acid groups contained in the base polymer are crosslinked by metal ions. More specifically, for example, "potassium ionomer of ethylene / unsaturated carboxylic acid copolymer" means that a part or all of the carboxylic acid groups contained in the ethylene / unsaturated carboxylic acid copolymer which is the base polymer is potassium. It has a structure bridged by ions.
- the resin layer A, the resin layer B, and the resin layer C are preferably arranged in this order.
- the resin layer C is preferably located outside the resin layer B (that is, at a position farther from the contents than the resin layer B) when the package is formed.
- the resin layer B is preferably located outside the resin layer A (that is, at a position farther from the contents than the resin layer A) from the viewpoint of further suppressing the accumulation of static electricity inside the package.
- the thickness of the entire laminate is not particularly limited, but is preferably 120 ⁇ m or less.
- the thickness of the entire laminate is preferably 110 ⁇ m or less, and more preferably 100 ⁇ m or less, from the viewpoint of efficiently releasing static electricity to the outside. From the viewpoint of durability, the thickness of the entire laminate is preferably 50 ⁇ m or more, and more preferably 60 ⁇ m or more.
- the laminate is used in an environment of 23 ° C. and a relative humidity of 50% when a voltage of 100 V is applied to the laminate for 30 seconds.
- the surface resistivity of the surface of the laminate opposite to the resin layer A is preferably 1 ⁇ 10 8 ⁇ / sq or more and 1 ⁇ 10 12 ⁇ / sq or less, and 1 ⁇ 10 9 ⁇ / sq or more and 1 ⁇ . It is more preferably 10 12 ⁇ / sq or less, and further preferably 1 ⁇ 10 9 ⁇ / sq or more and 9 ⁇ 10 11 ⁇ / sq or less.
- the surface resistivity ( ⁇ / sq) is 24 in an environment of 23 ° C. and 50% relative humidity using a high resistivity meter (for example, HIRESTA UP (MCP-HT450) manufactured by Mitsubishi Chemical Analytech Co., Ltd.).
- a high resistivity meter for example, HIRESTA UP (MCP-HT450) manufactured by Mitsubishi Chemical Analytech Co., Ltd.
- a laminate test piece that has been allowed to stand for a long time is placed on a guard electrode, a ring-shaped electrode is brought into contact with the surface, and a voltage of 100 V is applied for 30 seconds.
- the surface resistance is, for example, the ratio of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer, the degree of neutralization of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer, and each resin layer. It can be adjusted by adjusting the content of the structural unit derived from the unsaturated carboxylic acid in the ethylene / unsaturated carboxylic acid copolymer in the above.
- the laminate has a 1% charge decay time of 1 second or less at an applied voltage of + 5000 V measured in an environment of 23 ° C. and 50% relative humidity on both sides. It is preferably 0.6 seconds or less, and more preferably 0.4 seconds or less.
- the 1% charge attenuation time is 23 ° C., and the laminate left to stand in an environment of 50% relative humidity for 24 hours is subjected to a charge attenuation measuring device (for example, Model 406D Static Decay Meter manufactured by Electro-Tech Systems, Inc. of the United States).
- a charge attenuation measuring device for example, Model 406D Static Decay Meter manufactured by Electro-Tech Systems, Inc. of the United States.
- a voltage of + 5000 V is applied, and the time during which the charge voltage applied to the test piece decays to + 50 V is measured as the 1% charge decay time (sec) (according to the federal standard 101CMETHOD4046).
- the 1% decay time is, for example, the ratio of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer, the degree of neutralization of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer, and each resin. It can be controlled by adjusting the content of the structural unit derived from the unsaturated carboxylic acid in the ethylene / unsaturated carboxylic acid copolymer in the layer.
- the laminate is relative to 23 ° C. in accordance with IEC 61340-4-4 (2005) and JIS C 61340-4-4 (2009).
- a dielectric breakdown tester is used to sandwich the laminate between electrodes, boost the voltage applied at a rate of 0.3 kV per second, and the voltage at which dielectric breakdown occurs (that is, dielectric breakdown).
- the voltage is preferably less than 4.0 kV, more preferably 3.5 kV or less, and even more preferably 3.0 kV or less.
- the lower limit of the dielectric breakdown voltage is not particularly limited, but is preferably 0.5 kV or more, for example.
- the dielectric breakdown voltage is 0 per second when the laminate is sandwiched between electrodes using an dielectric breakdown tester (for example, HAT-100-100RH0 type manufactured by Yamazaki Sangyo Co., Ltd.) in an environment of 23 ° C. and 50% relative humidity. Obtained by boosting the voltage applied at a rate of .3 kV and measuring the voltage (kV) when dielectric breakdown occurs (IEC61340-4-4 (2005) and JIS C 61340-4-4 (2009). ) Compliant).
- an dielectric breakdown tester for example, HAT-100-100RH0 type manufactured by Yamazaki Sangyo Co., Ltd.
- the insulation breakdown voltage is, for example, adjusting the proportion of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer; the degree of neutralization of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in each resin layer.
- the resin layer A constituting the laminate contains a resin.
- the resin contained in the resin layer A is not particularly limited and can be selected according to the properties required for the laminate.
- the resin contained in the resin layer A may be only one type or two or more types.
- the resin contained in the resin layer A includes, for example, a homopolymer or copolymer of olefins, a polymer containing at least a structural unit derived from an olefin such as a polyolefin elastomer (hereinafter, also referred to as “olefin polymer”); Polymers containing at least styrene-derived structural units such as polystyrene, high-impact polystyrene, ABS (acrylonitrile-butadiene-styrene) resin (hereinafter, also referred to as "styrene-based polymers”); polyethylene terephthalate, polytrimethylene terephthalate, poly Tetramethylene terephthalate, polyethylene naphthalate, cyclohexanedimethanol copolymerized polyethylene terephthalate, polyester such as polyester elastomer; acrylic resin such as polycarbonate and polymethylmethacrylate; polymer containing at least
- the resin contained in the resin layer A preferably contains an olefin-based polymer from the viewpoint of heat-sealing property, and contains an ethylene-based polymer (a homopolymer of ethylene or a copolymer of ethylene and other components). More preferably, it contains a homopolymer of ethylene, a copolymer of ethylene and ⁇ -olefin having 3 or more carbon atoms (preferably a copolymer of ethylene and ⁇ -olefin having 3 to 12 carbon atoms), and ethylene. It is more preferable to contain at least one resin selected from the group consisting of a copolymer of and a polar monomer, and it is particularly preferable to contain linear low-density polyethylene.
- homopolymers of olefins include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE).
- LDPE low-density polyethylene
- MDPE medium-density polyethylene
- HDPE high-density polyethylene
- LLDPE linear low-density polyethylene
- VLDPE ultra-low-density polyethylene
- ethylene homopolymers examples thereof include homopolymers of olefins other than ethylene such as polypropylene, poly-1-butene and poly-4-methyl-1-pentene.
- ethylene and propylene examples thereof include a copolymer with an ⁇ -olefin such as -methyl-1-pentene.
- a copolymer of ethylene and a polar monomer a copolymer of ethylene and vinyl acetate; a copolymer of ethylene and an unsaturated carboxylic acid (acrylic acid, methacrylic acid, monoethyl maleate, maleic anhydride, etc.) Copolymers: With ethylene and unsaturated carboxylic acid esters (methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, -2-ethylhexyl acrylate, methyl methacrylate, glycidyl methacrylate, dimethyl maleate, etc.) Copolymers; Copolymers of ethylene, carbon monoxide and optionally unsaturated carboxylic acid ester or vinyl acetate; Copolymers of ethylene and polyolefin-based elastomers; Copolymers of these and Na, Li, Examples thereof include ionomers with Zn, M
- the olefin-based polymer preferably contains an ethylene-based polymer produced in the presence of a metallocene catalyst.
- an ethylene-based polymer can be produced by polymerizing ethylene and, if necessary, a copolymerization component used in the presence of a metallocene catalyst.
- the metallocene catalyst is, for example, a catalyst component composed of a compound of a transition metal (preferably zirconium) of Group IVB of the periodic table having at least one ligand having a cyclopentadienyl skeleton, and an organoaluminum oxy compound catalyst component. And various additive components used as needed.
- the density of the ethylene-based polymer produced in the presence of the metallocene catalyst is not particularly limited and can be selected according to the content of the copolymerization component (preferably ⁇ -olefin having 3 or more carbon atoms).
- the density of the ethylene polymer may be about 870 kg / m 3 to 970 kg / m 3 , preferably 890 kg / m 3 to 950 kg / m 3 , and more preferably 900 kg / m 3 to 940 kg. / M 3 .
- the resin contained in the resin layer A preferably has a melt flow rate of 0.1 g / 10 minutes to 100 g / 10 minutes at 190 ° C. and a load of 2160 g, and is 0.2 g. More preferably, it is / 10 minutes to 50 g / 10 minutes.
- the melt flow rate is measured according to JIS K7210-1 (2014).
- the resin layer A may be composed of only the resin or may contain components other than the resin.
- components other than the resin include antioxidants, light stabilizers, ultraviolet absorbers, pigments, dyes, lubricants, blocking inhibitors, inorganic fillers, foaming agents, foaming aids and the like.
- the content thereof is preferably 10% by mass or less, and more preferably 5% by mass or less of the entire resin layer A.
- the resin layer A does not contain potassium ionomer, or when it contains potassium ionomer, the amount thereof (that is, the amount of potassium ionomer) is preferably 10% by mass or less, preferably 5% by mass or less of the entire resin layer A. More preferably, it is more preferably 1% by mass or less.
- the thickness of the resin layer A is not particularly limited.
- the thickness of the resin layer A is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, and further preferably 10 ⁇ m or less, from the viewpoint of efficiently releasing static electricity to the outside.
- the thickness of the resin layer A is preferably 2 ⁇ m or more, and more preferably 5 ⁇ m or more, from the viewpoint of ensuring sufficient insulating properties.
- the resin layer B constituting the laminate contains the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in an amount of 50% by mass or more of the entire resin layer B.
- the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer contained in the resin layer B may be only one type or two or more types.
- the ethylene / unsaturated carboxylic acid copolymer serving as the base polymer of the potassium ionomer is obtained by copolymerizing ethylene and unsaturated carboxylic acid, and other polar monomers used as needed.
- the ethylene / unsaturated carboxylic acid copolymer is at least one selected from the group consisting of an ethylene / unsaturated carboxylic acid binary copolymer and an ethylene / unsaturated carboxylic acid alkyl ester / unsaturated carboxylic acid ternary copolymer. It is preferably a seed.
- Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, monomethyl maleate, monoethyl maleate and the like, and acrylic acid and methacrylic acid are preferable.
- Examples of other polar monomers used as needed include vinyl esters such as vinyl acetate and vinyl propionate, unsaturated carboxylic acid esters, carbon monoxide, and the like, with unsaturated carboxylic acid esters being preferable.
- the unsaturated carboxylic acid ester examples include an alkyl ester of an unsaturated carboxylic acid.
- an alkyl ester of the unsaturated carboxylic acid an alkyl ester having 2 to 5 carbon atoms of the unsaturated carboxylic acid is preferable, and an alkyl ester having 4 carbon atoms such as isobutyl and n-butyl of the unsaturated carboxylic acid is more preferable.
- alkyl esters of unsaturated carboxylic acids alkyl esters of acrylic acid or methacrylic acid are preferable.
- alkyl ester of acrylic acid or methacrylic acid examples include methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, n-butyl acrylate, isooctyl acrylate, methyl methacrylate, ethyl methacrylate, and the like. Examples thereof include isobutyl methacrylate, n-butyl methacrylate, isooctyl methacrylate, dimethyl maleate and the like.
- alkyl ester of acrylate or methacrylic acid examples include methyl acrylate, ethyl acrylate, isopropyl acrylate, isobutyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate and n methacrylate.
- alkyl esters of acrylic acid or methacrylic acid such as butyl and isooctyl methacrylate (eg, alkyl esters having 2 to 5 carbon atoms) are preferred.
- alkyl ester of acrylic acid or methacrylic acid an alkyl ester having 4 carbon atoms such as n-butyl ester or isobutyl ester of acrylic acid or methacrylic acid is preferable, and an alkyl ester having 4 carbon atoms of acrylic acid (particularly preferable). Is more preferred.
- the content of structural units derived from unsaturated carboxylic acid in the ethylene / unsaturated carboxylic acid copolymer (for example, the binary copolymer or the ternary copolymer) (hereinafter, "ethylene / unsaturated”).
- the “acid content of the carboxylic acid copolymer" is 10% by mass to 30% by mass with respect to the total amount of the ethylene / unsaturated carboxylic acid copolymer from the viewpoint of further suppressing the accumulation of static electricity. Is preferable, and it is more preferably 10% by mass to 25% by mass.
- the ratio of the other polar monomers is relative to the total amount of the ethylene / unsaturated carboxylic acid copolymer. , 30% by mass or less, and more preferably 15% by mass or less.
- the degree of neutralization of the ethylene / unsaturated carboxylic acid copolymer by potassium ions is preferably 60% or more, more preferably 70% or more from the viewpoint of further suppressing the accumulation of static electricity.
- the degree of neutralization is the degree of loss of the carboxyl groups present in the ethylene / unsaturated carboxylic acid copolymer as the base polymer by the reaction with metal ions (based on the number of moles of the carboxyl groups). (Represented by%).
- the melt flow rate of potassium ionomer which is an ethylene / unsaturated carboxylic acid copolymer, at 190 ° C. and a load of 2160 g may be 0.1 g / 10 minutes to 100 g / 10 minutes from the viewpoint of processability, scratch resistance, and the like. It is preferably 0.2 g / 10 minutes to 50 g / 10 minutes, more preferably.
- the resin layer B preferably contains two or more kinds of ethylene / unsaturated carboxylic acid copolymer potassium ionomers having different acid contents.
- the resin layer B is a potassium ionomer of two or more kinds of ethylene / unsaturated carboxylic acid copolymers in which the difference between the maximum acid content and the minimum acid content is 1% by mass or more, preferably 2% by mass to 20% by mass. Is preferably included.
- the maximum acid content refers to the acid content of the potassium ionomer having the highest acid content among the potassium ionomers of two or more kinds of ethylene / unsaturated carboxylic acid copolymers.
- the minimum acid content refers to the acid content of the potassium ionomer having the lowest acid content among the potassium ionomers of two or more kinds of ethylene / unsaturated carboxylic acid copolymers.
- the acid content (average acid content) of the two or more ethylene / unsaturated carboxylic acid copolymers is preferably 10% by mass to 30% by mass, and is preferably 10% by mass to 25% by mass. Is more preferable.
- the lower limit of the neutralization degree of the entire potassium ionomer of two or more kinds of ethylene / unsaturated carboxylic acid copolymers by potassium ions is preferably 60% or more, and more preferably 70% or more.
- the upper limit of the degree of neutralization of the entire potassium ionomer of two or more kinds of ethylene / unsaturated carboxylic acid copolymers by potassium ions is not particularly limited, but is preferably 90% or less, for example.
- the acid content is 1% by mass to 11% by mass, preferably 2% by mass to 10% by mass. , 190 ° C. to an ethylene / unsaturated carboxylic acid copolymer (A-1) having a melt flow rate of 1 g / 10 min to 600 g / 10 min, preferably 10 g / 10 min to 500 g / 10 min under a load of 2160 g.
- the acid content is 11% by mass to 25% by mass, preferably 13% by mass to 23% by mass, and the melt flow rate under a load of 190 ° C.
- 2160 g is 1 g / 10 minutes to 600 g / 10 minutes, preferably 10 g / 10 minutes to. It is a combination with an ethylene / unsaturated carboxylic acid copolymer (A-2) having a weight of 500 g / 10 minutes, and has an average acid content of 10% by mass to 20% by mass, preferably 11% by mass to 15% by mass. , 190 ° C. to 2160 g load with an average melt flow rate of 1 g / 10 min to 300 g / 10 min, preferably 10 g / 10 min to 200 g / 10 min, more preferably 20 g / 10 min to 150 g / 10 min. Suitable.
- the mixing ratio of the copolymer (A-1) and the copolymer (A-2) is, for example, 1 part by mass to 200 parts by mass, preferably 50 parts by mass, with respect to 100 parts by mass of the former. It may be a part to 150 parts by mass.
- the resin layer B may be composed of only the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer, or may contain a component other than the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer (however, however).
- the amount of potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer is 50% by mass or more of the total resin layer B).
- the resin layer B may contain a resin other than the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer, for example, as long as the antistatic performance, slipperiness and scratch resistance of the laminate are not significantly impaired.
- the type of resin other than the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer is not particularly limited, and may be selected from those exemplified as the resin contained in the resin layer A.
- the resin other than the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer an olefin polymer is preferable, an ethylene polymer is more preferable, and an ethylene homopolymer, ethylene and carbon are preferable from the viewpoint of heat sealability.
- At least one selected from the group consisting of a polymer of ⁇ -olefin having a number of 3 or more (preferably 3 to 12 carbon atoms) and a polymer of ethylene and a polar monomer is more preferable, and linear low density is more preferable.
- Polyethylene is particularly preferred.
- the proportion of the resin other than the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer is 45% by mass of the entire resin layer B. It may be less than or equal to, 35% by mass or less, and 25% by mass or less. That is, the proportion of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer may be 55% by mass or more, 65% by mass or more, or 75% by mass or more of the entire resin layer B. May be good.
- the resin layer B may contain a polyhydroxy compound having two or more alcoholic hydroxyl groups in order to improve the antistatic performance.
- a polyhydroxy compound polyoxyalkylene glycols having various molecular weights such as polyethylene glycol, polypropylene glycol, polyoxyethylene / polyoxypropylene glycol; polyhydric alcohols such as glycerin, hexanetriol, pentaerythritol, and sorbitol; and these.
- Ethylene oxide adducts; polyhydric amine and alkylene oxide adducts and the like can be exemplified.
- the amount of the polyhydroxy compound is preferably set within a range that does not impair the mechanical properties of the resin layer B.
- the amount of the polyhydroxy compound may be 15% by mass or less of the entire resin layer B or 10% by mass or less.
- the resin layer B may contain an antioxidant, a light stabilizer, an ultraviolet absorber, a pigment, a dye, a lubricant, an antiblocking agent, an inorganic filler, a foaming agent, a foaming aid, and the like, if necessary.
- the amount thereof is preferably 10% by mass or less, more preferably 5% by mass or less of the entire resin layer B.
- the thickness of the resin layer B is not particularly limited.
- the thickness of the resin layer B may be selected from the range of 20 ⁇ m to 90 ⁇ m from the viewpoint of efficiently releasing static electricity to the outside.
- the resin layer C constituting the laminate contains the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer in an amount of more than 10% by mass and less than 50% by mass of the entire resin layer C.
- the resin contained in the resin layer C may be only one type or two or more types.
- the amount of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer contained in the resin layer C may be more than 10% by mass and less than 50% by mass of the entire resin layer C.
- the amount of potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer contained in the resin layer C may exceed 10% by mass and 40% by mass or less of the entire resin layer C, and may exceed 10% by mass. It may be 30% by mass or less, or more than 10% by mass and 25% by mass or less.
- the amount of the potassium ionomer of the ethylene / unsaturated carboxylic acid copolymer contained in the resin layer C is preferably 15% by mass or more, preferably 20% by mass or more, from the viewpoint of efficiently releasing static electricity to the outside. More preferably, it is% or more.
- the thickness of the resin layer C is not particularly limited.
- the thickness of the resin layer C may be selected from the range of 1 ⁇ m to 20 ⁇ m from the viewpoint of efficiently releasing static electricity to the outside.
- the laminate of the present disclosure may be composed of only the resin layers A, B and C described above, or may include members other than the resin layers A, B and C. However, from the viewpoint of lowering the dielectric breakdown voltage, it is preferable that the members other than the resin layers A, B and C are not provided.
- the laminate of the present disclosure may be further provided with an adhesive layer containing a rubber-based adhesive material, an acrylic-based adhesive material, a silicon-based adhesive material, or the like in order to bring the resin layers into close contact with each other.
- the laminate of the present disclosure may be further provided with a barrier layer for enhancing the gas barrier property and the water vapor barrier property of the laminate.
- a stretched film of polyethylene terephthalate (PET), polyamide, polyolefin, etc., and a thin film of an inorganic compound such as aluminum, aluminum oxide, silicon oxide, etc. are formed on these stretched films by physical vapor deposition or chemical vapor deposition to about 20 nm to 100 nm.
- Inorganic compound vapor-deposited plastic film, aluminum foil, ethylene vinyl alcohol copolymer resin film, vinylidene chloride film, polyvinyl alcohol film and the like provided to have a thickness can be preferably used.
- the adhesive layer and the barrier layer may be used by laminating them, if necessary.
- the thickness of the laminated body is the thickness including the thickness of these members.
- the method for producing the laminate of the present disclosure is not particularly limited, and a conventionally known method can be adopted.
- the laminate of the present disclosure can be produced by laminating each layer by a molding method such as extrusion coating molding, coextrusion molding, multi-layer inflation molding, or sandwich laminate molding.
- the package of the present disclosure includes the laminate of the present disclosure, and the resin layer A is arranged inside (the side closer to the contents).
- the shape and size of the package are not particularly limited, and bags, containers, and the like of any shape and size may be used.
- the package may consist of only the laminate or may include members other than the laminate.
- the packaging may include an outer bag that is located outside the laminate.
- the material of the outer bag is not particularly limited, but from the viewpoint of efficiently releasing the static electricity inside, it is preferable to use a material having conductivity.
- the use of the package is not particularly limited, but it is particularly preferably used as an inner bag of a flexible container.
- Flexible containers generally have a large capacity, and there is a high risk of accidents due to static electricity accumulated inside. Therefore, a flexible container provided with a package made from the laminate of the present disclosure in which static electricity is less likely to be accumulated inside is excellent in safety.
- the flexible container inner bag of the present disclosure includes the laminate of the present disclosure, and the resin layer A is arranged inside (the side closer to the contents).
- the flexible container of the present disclosure includes the flexible container inner bag and an outer bag arranged outside the flexible container inner bag.
- the capacity of the flexible container inner bag or the flexible container is not particularly limited, and may be, for example, 100 liters to 1000 liters.
- melt flow rate was measured at 190 ° C. and a load of 2160 g in accordance with JIS K7210-1 (2014).
- Potassium ionomers (IO-1 and IO-2) shown in Table 2 were synthesized using the base polymers shown in Table 1 as raw materials.
- the amount of glycerin added shown in Table 2 is the content rate with respect to the entire potassium ionomer.
- thermoplastic resin shown in Table 3 was used as the resin other than the potassium ionomer contained in the resin layer.
- Examples 1 to 4 and Comparative Examples 1 to 5 Using the above-mentioned materials, a laminate having the constitution shown in Table 4 was prepared. Specifically, using a multilayer inflation film forming machine, MPE-1 is resin layer A (inner layer), IO-1 is resin layer B (intermediate layer), MPE-1 (80 parts by mass) and IO-1 (80 parts by mass). The mixed resin dry-blended at a blending ratio of 20 parts by mass) was configured to be the resin layer C (outer layer), and the molding temperature (die temperature) was set to 170 ° C. to prepare the laminate of Example 1.
- Example 4 the laminates of Examples 2 to 4 and Comparative Examples 1 to 5 (Comparative Example 4) were obtained in the same manner as in Example 1 except that the composition and thickness of the resin layer and the molding temperature were changed as shown in Table 4. Used a single-layer inflation film forming machine).
- the electrical characteristics of the prepared laminate were evaluated by the following tests.
- the "evaluation of electrical characteristics of the inner surface” shown in Table 4 is an evaluation of the surface of the resin layer A
- the “evaluation of electrical characteristics of the outer surface” is the evaluation of the resin layer C when the laminate includes the resin layer C.
- the surface of the resin layer B is evaluated, and when the resin layer A is used alone, the other surface of the resin layer A is evaluated. is there.
- the laminate is sandwiched between the electrodes using the dielectric breakdown tester "HAT-300-100RH0 type" manufactured by Yamazaki Sangyo Co., Ltd.
- the voltage applied was boosted at a rate of 3 kV, and the voltage (kV) when dielectric breakdown occurred was measured (according to IEC61340-4-4 (2005) and JIS C 61340-4-4 (2009)).
- the resin layer A, the resin layer B, and the resin layer C are provided at least, and the resin layer B contains potassium ionomer in an amount of 50% by mass or more of the entire resin layer B, and the resin layer C contains.
- the laminated body of the example containing the potassium ionomer in an amount of more than 10% by mass and less than 50% by mass of the entire resin layer C achieved a lower insulation breakdown voltage than the laminated body of the comparative example.
- the surface resistivity of the outer surface is 1 ⁇ 10 9 ⁇ / sq or more and 1 ⁇ 10 12 ⁇ / sq or less
- the surface resistivity of the inner surface is 1 ⁇ 10 12 It showed electrical characteristics conforming to the standard (L2) of the FIBC inner bag standard (IEC 61340-4-4 (2016)) that it was more than ⁇ / sq and (3) the insulation breakdown voltage was less than 4 kV.
- Comparative Example 1 having the resin layer A and the resin layer C but not having the resin layer B, and Comparative Examples 2 and 3 having the resin layer A and the resin layer B but not having the resin layer C, insulation was provided.
- the breaking voltage was over 5 kV.
- Comparative Examples 4 and 5 in which the resin layer A alone having a thickness of 50 ⁇ m or 110 ⁇ m was evaluated, when a voltage of 5000 V was applied to the sample, it was not charged by 4500 V or more, and the 1% charge decay time could not be measured. Further, in Comparative Examples 4 and 5, the dielectric breakdown voltage was also large.
- a resin layer A and a resin layer B are provided at least, and the thickness is 100 ⁇ m or less.
- the resin layer B is a laminate containing potassium ionomer, which is an ethylene / unsaturated carboxylic acid copolymer, in an amount of 50% by mass or more of the entire resin layer B.
- the laminate according to [1] further comprising a resin layer C, wherein the resin layer C contains an ethylene / unsaturated carboxylic acid copolymer potassium ionomer in an amount of less than 50% by mass of the entire resin layer C.
- the laminate according to [2] wherein the resin layer A, the resin layer B, and the resin layer C are arranged in this order.
- the surface resistivity of the surface of the laminate opposite to the resin layer A when a voltage of 100 V is applied to the laminate for 30 seconds is 1.
- the resin layer B contains two or more kinds of ethylene / unsaturated carboxylic acid copolymer potassium ionomer having a difference between the maximum acid content and the minimum acid content of 2% by mass to 20% by mass, and the potassium of the potassium ionomer.
- the resin layer A contains a linear low-density polyethylene.
- [12] A package containing the laminate according to any one of [1] to [11], wherein the resin layer A is arranged inside. [13] The package according to [12], further comprising an outer bag arranged outside the laminate. [14] A flexible container inner bag containing the laminate according to any one of [1] to [11] and in which the resin layer A is arranged inside. [15] A flexible container including the flexible container inner bag according to [14] and an outer bag arranged outside the flexible container inner bag.
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Abstract
Description
<1> 樹脂層Aと、樹脂層Bと、樹脂層Cとを少なくとも備え、
樹脂層Bはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層B全体の50質量%以上の量で含み、
樹脂層Cはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層C全体の10質量%を超えて50質量%未満の量で含む、積層体。
<2> 積層体全体の厚さが120μm以下である、<1>に記載の積層体。
<3> 樹脂層A、樹脂層B及び樹脂層Cがこの順に配置される、<1>又は<2>に記載の積層体。
<4> 23℃、相対湿度50%の環境下において、前記積層体に対して100Vの電圧を30秒間印加したときの、前記積層体の樹脂層Aと反対側の表面の表面抵抗率が1×109Ω/sq以上、1×1012Ω/sq以下である、<1>~<3>のいずれか1つに記載の積層体。
<5> 両面について23℃、相対湿度50%の環境下で測定した印加電圧+5000Vにおける1%減衰時間が1秒以下である、<1>~<4>のいずれか1つに記載の積層体。
<6> 樹脂層Bは最高酸含量と最低酸含量の差が2質量%~20質量%となる2種以上のエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを含み、前記カリウムアイオノマーのカリウムイオンによる中和度は60%以上である、<1>~<5>のいずれか1つに記載の積層体。
<7> 樹脂層Aはオレフィン系重合体を含む、<1>~<6>のいずれか1つに記載の積層体。
<8> 樹脂層Aは直鎖状低密度ポリエチレンを含む、<1>~<7>のいずれか1つに記載の積層体。
<9> 樹脂層Aの厚さは20μm以下である、<1>~<8>のいずれか1つに記載の積層体。
<10> 樹脂層Aはカリウムアイオノマーを含まないか、カリウムアイオノマーを含む場合はその量が樹脂層A全体の10質量%以下である、<1>~<9>のいずれか1つに記載の積層体。
<11> IEC 61340-4-4(2005)及びJIS C 61340-4-4(2009)に準拠して、23℃、相対湿度50%の環境下において、絶縁破壊試験機を用いて、積層体を電極で挟み込み、毎秒0.3kVの速度で印加する電圧を昇圧し、絶縁破壊が生じたときの電圧が4kV未満である、<1>~<10>のいずれか1つに記載の積層体。
<12> <1>~<11>のいずれか1つに記載の積層体を含み、樹脂層Aが内側に配置される、包装体。
<13> 前記積層体の外側に配置される外袋をさらに備える、<12>に記載の包装体。
<14> <1>~<11>のいずれか1つに記載の積層体を含み、樹脂層Aが内側に配置される、フレキシブルコンテナ内袋。
<15> <14>に記載のフレキシブルコンテナ内袋と、前記フレキシブルコンテナ内袋の外側に配置される外袋とを備える、フレキシブルコンテナ。
本開示において、組成物中の各成分の量は、組成物中に各成分に該当する物質が複数存在する場合は、特に断らない限り、組成物中に存在する複数の物質の合計量を意味する。
本開示に段階的に記載されている数値範囲において、ある数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよく、また、実施例に示されている値に置き換えてもよい。
本開示の積層体は、樹脂層Aと、樹脂層Bと、樹脂層Cとを少なくとも備え、樹脂層Bはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層B全体の50質量%以上の量で含み、樹脂層Cはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層C全体の10質量%を超えて50質量%未満の量で含む、積層体である。
積層体は、樹脂層A、樹脂層B及び樹脂層Cがこの順に配置されることが好ましい。
積層体全体の厚さは、特に制限されないが、120μm以下であることが好ましい。
積層体全体の厚さは、静電気を効率よく外部に逃がす観点からは、110μm以下であることが好ましく、100μm以下であることがより好ましい。
積層体全体の厚さは、耐久性の観点からは、50μm以上であることが好ましく、60μm以上であることがより好ましい。
積層体は、包装体の内部での静電気の蓄積をより抑制する観点からは、23℃、相対湿度50%の環境下において、前記積層体に対して100Vの電圧を30秒間印加したときの、前記積層体の樹脂層Aと反対側の表面の表面抵抗率が、1×108Ω/sq以上1×1012Ω/sq以下であることが好ましく、1×109Ω/sq以上1×1012Ω/sq以下であることがより好ましく、1×109Ω/sq以上9×1011Ω/sq以下であることがさらに好ましい。
積層体を構成する樹脂層Aは、樹脂を含む。
樹脂層Aに含まれる樹脂は特に制限されず、積層体に求められる性質等に応じて選択できる。樹脂層Aに含まれる樹脂は、1種のみでも2種以上であってもよい。
一例として、エチレン系重合体は、メタロセン触媒の存在下で、エチレン及び必要に応じて用いる共重合成分を重合することによって製造できる。メタロセン触媒は、例えば、シクロペンタジエニル骨格を有する配位子を少なくとも1個以上有する周期律表IVB族の遷移金属(好ましくは、ジルコニウム)の化合物からなる触媒成分と、有機アルミニウムオキシ化合物触媒成分と、必要に応じて用いられる各種添加成分とから形成される。
積層体を構成する樹脂層Bは、エチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層B全体の50質量%以上の量で含む。
エチレン・不飽和カルボン酸共重合体は、エチレン・不飽和カルボン酸2元共重合体及びエチレン・不飽和カルボン酸アルキルエステル・不飽和カルボン酸3元共重合体からなる群から選択される少なくとも1種であることが好ましい。
具体的には、アクリル酸又はメタクリル酸のアルキルエステルとしては、アクリル酸メチル、アクリル酸エチル、アクリル酸イソプロピル、アクリル酸イソブチル、アクリル酸n-ブチル、アクリル酸イソオクチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸イソブチル、メタクリル酸n-ブチル、メタクリル酸イソオクチル、マレイン酸ジメチル等が挙げられる。
中でも、アクリル酸又はメタクリル酸のアルキルエステルとしては、アクリル酸メチル、アクリル酸エチル、アクリル酸イソプロピル、アクリル酸イソブチル、アクリル酸n-ブチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸イソブチル、メタクリル酸n-ブチル、メタクリル酸イソオクチル等の、アクリル酸又はメタクリル酸の低級アルキルエステル(例えば、炭素数2~5のアルキルエステル)が好ましい。
さらには、アクリル酸又はメタクリル酸のアルキルエステルとしては、アクリル酸又はメタクリル酸のn-ブチルエステル、イソブチルエステル等の炭素数4のアルキルエステルが好ましく、アクリル酸の炭素数4のアルキルエステル(特に好ましくは、イソブチルエステル)がより好ましい。
この場合、2種以上のエチレン・不飽和カルボン酸共重合体全体の酸含量(平均酸含量)は、10質量%~30質量%であることが好ましく、10質量%~25質量%であることがより好ましい。
この場合、2種以上のエチレン・不飽和カルボン酸共重合体のカリウムアイオノマー全体のカリウムイオンによる中和度の下限値は60%以上であることが好ましく、70%以上であることがより好ましい。2種以上のエチレン・不飽和カルボン酸共重合体のカリウムアイオノマー全体のカリウムイオンによる中和度の上限値は、特に制限されないが、例えば、90%以下であることが好ましい。
積層体を構成する樹脂層Cは、エチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層C全体の10質量%を超えて50質量%未満の量で含む。
樹脂層Cに含まれる樹脂は、1種のみでも2種以上であってもよい。
本開示の積層体は、上述した樹脂層A、B及びCのみから構成されても、樹脂層A、B及びC以外の部材を備えていてもよい。ただし、絶縁破壊電圧を低くする観点からは、樹脂層A、B及びC以外の部材を備えていないことが好ましい。
本開示の積層体は、例えば、樹脂層間を密着させるためにゴム系粘着材、アクリル系粘着材、シリコン系粘着材等を含む粘着層をさらに設けてもよい。あるいは、本開示の積層体は、積層体のガスバリア性や水蒸気バリア性を高めるためのバリア層をさらに設けてもよい。バリア層としては、ポリエチレンテレフタレート(PET)、ポリアミド、ポリオレフィン等の延伸フィルム、これらの延伸フィルム上にアルミニウム、酸化アルミニウム、酸化ケイ素等の無機化合物の薄膜を物理蒸着又は化学蒸着により20nm~100nm程度の厚さに設けた無機化合物蒸着プラスチックフィルム、アルミニウム箔、エチレンビニルアルコール共重合樹脂フィルム、塩化ビニリデンフィルム、ポリビニルアルコールフィルム等が好ましく使用できる。粘着層及びバリア層は、必要に応じて、これらを積層して用いてもよい。
本開示の包装体は、本開示の積層体を含み、樹脂層Aが内側(内容物に近い側)に配置される。包装体の形状及び大きさは特に制限されず、あらゆる形状の及び大きさの袋、容器等であってよい。
本開示のフレキシブルコンテナ内袋は、本開示の積層体を含み、樹脂層Aが内側(内容物に近い側)に配置される。
本開示のフレキシブルコンテナは、上記フレキシブルコンテナ内袋と、前記フレキシブルコンテナ内袋の外側に配置される外袋とを備える。
フレキシブルコンテナ内袋又はフレキシブルコンテナの容量は特に制限されず、例えば、100リットル~1000リットルであってもよい。
表1に示すベースポリマーを原料とし、表2に示すカリウムアイオノマー(IO-1及びIO-2)をそれぞれ合成した。表2に示すグリセリン添加量は、カリウムアイオノマー全体に対する含有率である。
上述した材料を用いて、表4に示す構成の積層体を作製した。具体的には、多層インフレーションフィルム成形機を用いて、MPE-1を樹脂層A(内層)、IO-1を樹脂層B(中間層)、MPE-1(80質量部)とIO-1(20質量部)の配合比でドライブレンドした混合樹脂を樹脂層C(外層)となるように構成し、成形温度(ダイス温度)を170℃に設定して実施例1の積層体を作製した。また、樹脂層の組成及び厚さ、並びに成形温度を表4に示すように変更したこと以外は実施例1と同様にして実施例2~4及び比較例1~5の積層体(比較例4は単層インフレーションフィルム成形機を用いた)を作製した。
作製した積層体の電気特性を、下記の試験により評価した。表4に示す「内表面の電気特性評価」は、樹脂層Aの表面についての評価であり、「外表面の電気特性評価」は、積層体が樹脂層Cを備えている場合は樹脂層Cの表面について、積層体が樹脂層Bを備えており且つ樹脂層Cを備えていない場合は樹脂層Bの表面について、樹脂層A単体の場合は樹脂層Aのもう一方の表面についての評価である。
23℃、相対湿度50%の環境下において、山崎産業株式会社製の絶縁破壊試験機「HAT-300-100RH0型」を用いて、積層体を電極で挟み込み、毎秒0.3kVの速度で印加する電圧を昇圧していき、絶縁破壊が生じたときの電圧(kV)を測定した(IEC61340-4-4(2005)及びJIS C 61340-4-4(2009)準拠)。
23℃、相対湿度50%の環境下に24時間静置させた積層体を、米国Electro-Tech Systems社製の「Model 406D Static Decay Meter」を用いて、電圧+5000Vを印加し、試験片にかかるチャージ電圧が+50Vへ減衰する時間を1%帯電減衰時間(sec)として測定した(連邦基準規格101CMETHOD4046準拠)。
株式会社三菱ケミカルアナリテック社製の高抵抗率計「HIRESTA UP(MCP-HT450)」を用いて、23℃、相対湿度50%の環境下に24時間静置させた積層体試験片をガード電極に置き、リング型の電極を表面に接触させ、電圧100Vを30秒印加し、表面抵抗率(Ω/sq)を測定した。
さらに実施例の積層体は、(1)外面の表面抵抗率が1×109Ω/sq以上、1×1012Ω/sq以下であり、(2)内面の表面抵抗率が1×1012Ω/sq超であり、かつ(3)絶縁破壊電圧が4kV未満であるという、FIBC内袋規格(IEC 61340-4-4(2018)の規格(L2)に合致する電気特性を示した。
厚さが50μm又は110μmの樹脂層A単体について評価した比較例4及び5では、試料に5000Vの電圧を印加した際に4500V以上チャージされず、1%帯電減衰時間を測定できなかった。また、比較例4及び5は、絶縁破壊電圧も大きかった。
[1] 樹脂層Aと樹脂層Bとを少なくとも備え、厚さが100μm以下であり、
樹脂層Bはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層B全体の50質量%以上の量で含む、積層体。
[2] さらに樹脂層Cを備え、樹脂層Cはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層C全体の50質量%未満の量で含む、[1]に記載の積層体。
[3] 樹脂層A、樹脂層B及び樹脂層Cがこの順に配置される、[2]に記載の積層体。
[4] 23℃、相対湿度50%の環境下において、前記積層体に対して100Vの電圧を30秒間印加したときの、前記積層体の樹脂層Aと反対側の表面の表面抵抗率が1×109Ω/sq以上、1×1012Ω/sq以下である、[1]~[3]のいずれか1つに記載の積層体。
[5] 両面について23℃、相対湿度50%の環境下で測定した印加電圧+5000Vにおける1%減衰時間が1秒以下である、[1]~[4]のいずれか1つに記載の積層体。
[6] 樹脂層Bは最高酸含量と最低酸含量の差が2質量%~20質量%となる2種以上のエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを含み、前記カリウムアイオノマーのカリウムイオンによる中和度は60%以上である、[1]~[5]のいずれか1つに記載の積層体。
[7] 樹脂層Aはオレフィン系重合体を含む、[1]~[6]のいずれか1つに記載の積層体。
[8] 樹脂層Aは直鎖状低密度ポリエチレンを含む、[1]~[7]のいずれか1つに記載の積層体。
[9] 樹脂層Aの厚さは20μm以下である、[1]~[8]のいずれか1つに記載の積層体。
[10] 樹脂層Aはカリウムアイオノマーを含まないか、カリウムアイオノマーを含む場合はその量が樹脂層A全体の10質量%以下である、[1]~[9]のいずれか1つに記載の積層体。
[11] IEC 61340-4-4(2005)及びJIS C 61340-4-4(2009)に準拠して、23℃、相対湿度50%の環境下において、絶縁破壊試験機を用いて、積層体を電極で挟み込み、毎秒0.3kVの速度で印加する電圧を昇圧し、絶縁破壊が生じたときの電圧が4kV未満である、[1]~[10]のいずれか1つに記載の積層体。
[12] [1]~[11]のいずれか1つに記載の積層体を含み、樹脂層Aが内側に配置される、包装体。
[13] 前記積層体の外側に配置される外袋をさらに備える、[12]に記載の包装体。
[14] [1]~[11]のいずれか1つに記載の積層体を含み、樹脂層Aが内側に配置される、フレキシブルコンテナ内袋。
[15] [14]に記載のフレキシブルコンテナ内袋と、前記フレキシブルコンテナ内袋の外側に配置される外袋とを備える、フレキシブルコンテナ。
Claims (15)
- 樹脂層Aと、樹脂層Bと、樹脂層Cとを少なくとも備え、
樹脂層Bはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層B全体の50質量%以上の量で含み、
樹脂層Cはエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを樹脂層C全体の10質量%を超えて50質量%未満の量で含む、積層体。 - 積層体全体の厚さが120μm以下である、請求項1に記載の積層体。
- 樹脂層A、樹脂層B及び樹脂層Cがこの順に配置される、請求項1又は請求項2に記載の積層体。
- 23℃、相対湿度50%の環境下において、前記積層体に対して100Vの電圧を30秒間印加したときの、前記積層体の樹脂層Aと反対側の表面の表面抵抗率が1×109Ω/sq以上、1×1012Ω/sq以下である、請求項1~請求項3のいずれか1項に記載の積層体。
- 両面について23℃、相対湿度50%の環境下で測定した印加電圧+5000Vにおける1%減衰時間が1秒以下である、請求項1~請求項4のいずれか1項に記載の積層体。
- 樹脂層Bは最高酸含量と最低酸含量の差が2質量%~20質量%となる2種以上のエチレン・不飽和カルボン酸共重合体のカリウムアイオノマーを含み、前記カリウムアイオノマーのカリウムイオンによる中和度は60%以上である、請求項1~請求項5のいずれか1項に記載の積層体。
- 樹脂層Aはオレフィン系重合体を含む、請求項1~請求項6のいずれか1項に記載の積層体。
- 樹脂層Aは直鎖状低密度ポリエチレンを含む、請求項1~請求項7のいずれか1項に記載の積層体。
- 樹脂層Aの厚さは20μm以下である、請求項1~請求項8のいずれか1項に記載の積層体。
- 樹脂層Aはカリウムアイオノマーを含まないか、カリウムアイオノマーを含む場合はその量が樹脂層A全体の10質量%以下である、請求項1~請求項9のいずれか1項に記載の積層体。
- IEC 61340-4-4(2005)及びJIS C 61340-4-4(2009)に準拠して、23℃、相対湿度50%の環境下において、絶縁破壊試験機を用いて、積層体を電極で挟み込み、毎秒0.3kVの速度で印加する電圧を昇圧し、絶縁破壊が生じたときの電圧が4kV未満である、請求項1~請求項10のいずれか1項に記載の積層体。
- 請求項1~請求項11のいずれか1項に記載の積層体を含み、樹脂層Aが内側に配置される、包装体。
- 前記積層体の外側に配置される外袋をさらに備える、請求項12に記載の包装体。
- 請求項1~請求項11のいずれか1項に記載の積層体を含み、樹脂層Aが内側に配置される、フレキシブルコンテナ内袋。
- 請求項14に記載のフレキシブルコンテナ内袋と、前記フレキシブルコンテナ内袋の外側に配置される外袋とを備える、フレキシブルコンテナ。
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JP5225524B2 (ja) * | 2001-02-09 | 2013-07-03 | 三井・デュポンポリケミカル株式会社 | アイオノマー樹脂組成物及びその用途 |
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