Resin composition for sealing material and its use

Abstract

Resin composition for a sealing material, comprising an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B) and a 4-methyl-1-pentene / propylene copolymer (C), wherein the content of the 4-methyl-1-pentene / propylene copolymer (C) is from 1 wt% to 20 wt% in relation to a total mass of the resin composition for a sealing material.

Description

[Technical field]

[0001] The invention relates to a resin composition for a sealing material and its use. [State of the art]

[0002] Plastic containers with easy-open lids are widely used as packaging for various types of food, beverages, and pharmaceuticals. The packaging material used for the lid's sealing layer must be easy to open, as well as exhibit a wide range of heat-sealing temperatures and consistent peel resistance. Since the required degree of peel resistance varies depending on the material and the intended use of the container, various types of packaging materials have been proposed and implemented.

[0003] Many types of packaging materials suitable for containers made from conventional materials such as polyolefin, polyvinyl chloride and polystyrene are already known (see, for example, JP H05-6513 A and JP H02-185547 A).

[0004] For example, US Patent 6,228,504 B1 discloses an adhesive composition suitable for manufacturing a multilayer laminated body and a laminated molded body. The adhesive composition consists of an ethylene-vinyl acetate copolymer, a modified ethylene / alpha-olefin copolymer with a degree of crystallinity not greater than 40%, a tackifier, and a styrene-type polymer. JP 2009-227790 A is directed to a polymeric composition containing (A) an ethylene / (meth)acrylic acid copolymer (a1), an ionomer (a2) of an ethylene / (meth)acrylic acid copolymer, and a mixture (a3) ​​of copolymer (a1) and ionomer (a2), as well as (B) a methylpentene polymer, such as a 4-methyl-1-pentene polymer. [Brief description of the invention][Problem to be solved by the invention]

[0005] However, as with containers made of amorphous polyester, which have recently gained attention as highly transparent containers, suitable packaging materials with favorable peel properties for practical application still need to be found. Specifically, with commonly proposed packaging materials, it is difficult to achieve both a sufficient degree of peel resistance and suppressed vibration (a phenomenon that produces a peeling noise and slight vibration) after removal, with regard to amorphous polyester.

[0006] In light of the foregoing, the present disclosure aims to provide a resin composition for a sealing material which has excellent peel strength with respect to a substrate (in particular, adhesion strength with respect to an amorphous polyester) and suppressed shimmering after peeling, i.e., excellent peelability, a multilayer body, a packaging material and a packaging container. [Means to solve the problem]

[0007] The invention relates to a resin composition for a sealing material, comprising an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B) and a 4-methyl-1-pentene / propylene copolymer (C), wherein the content of the 4-methyl-1-pentene / propylene copolymer (C) is from 1 wt% to 20 wt% in relation to a total mass of the resin composition for a sealing material.

[0008] Preferably, the resin composition according to the invention for a sealing material further comprises a styrene elastomer (D).

[0009] In a preferred embodiment, the styrene elastomer (D) comprises at least one selected from the group consisting of a styrene-ethylene / butylene block copolymer (SEB), a styrene-ethylene / butylene-styrene block copolymer (SEBS) and a styrene-ethylene / propylene-styrene block copolymer (SEPS).

[0010] In a preferred embodiment, the content of the styrene elastomer (D) is 1 wt% to 15 wt% in relation to a total mass of the resin composition for a sealing material.

[0011] In a preferred embodiment, the 4-methyl-1-pentene / α-propylene copolymer (C) has a melting point of less than 110 °C or has no melting point.

[0012] In a preferred embodiment, the ethylene / vinyl ester copolymer (A) is an ethylene / vinyl acetate copolymer.

[0013] In a preferred embodiment, the ethylene / vinyl ester copolymer (A) has a content of vinyl acetate-derived structural units of 1 wt% to 30 wt%.

[0014] In a preferred embodiment, the resin composition for a sealing material has a melt mass flow rate (JIS K 7210-1999, 190 °C, 2160 g loading) of 1 g / 10 min to 100 g / 10 min.

[0015] Another aspect of the invention relates to the use of the resin composition according to the invention for the production of a sealing material, a multi-layered body, a packaging material or a packaging container.

[0016] In a preferred embodiment of the use, the packaging material comprises the multilayer body.

[0017] In a preferred embodiment of use, the multilayer body comprises a carrier material and a sealing layer, wherein the sealing layer comprises the resin composition according to the invention.

[0018] In a preferred embodiment of the use, the packaging material is a lid material.

[0019] In a further embodiment of the use, the packaging container comprises a main container part with an opening and a lid that closes the opening, the lid comprising the resin composition according to the invention. Preferably, the main container part comprises an amorphous polyester. [Effect of the invention]

[0020] According to the present disclosure, a resin composition for a sealing material which exhibits excellent peelability and excellent peelability with respect to a substrate, a multilayer body, a packaging material and a packaging container. [Execution methods for implementing the invention]

[0021] The embodiments of the present disclosure are explained below. The explanation and examples are intended to illustrate the embodiments but not to limit them.

[0022] In the present disclosure, a numerical range specified using "to" includes the numerical values ​​before and after "to" as a minimum and maximum value, respectively.

[0023] In the case of numerical ranges specified stepwise in this disclosure, the upper or lower limit specified for one numerical range may be replaced by the upper or lower limit of another stepwise specified numerical range. Furthermore, in the case of the numerical range specified in this disclosure, the upper or lower limit of the numerical range may be replaced by the value shown in the examples. - Resin composition for a sealing material -

[0024] The resin composition for a sealing material according to the present invention comprises an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B) and a 4-methyl-1-pentene / α-propylene copolymer (C), and the content of the 4-methyl-1-pentene / α-propylene copolymer (C) is from 1 wt% to 20 wt% in relation to a total mass of the resin composition for a sealing material.

[0025] The resin composition according to the invention for a sealing material comprises a 4-methyl-1-pentene / propylene copolymer (C) with excellent stress-relaxation properties, in addition to an ethylene / vinyl ester copolymer (A) and an adhesion-promoting resin (B). It is assumed that this is one reason why the resin composition according to the invention for a sealing material exhibits excellent peel resistance and excellent removal properties from a substrate, even when used, for example, as packaging material. < <Charakteristika der Harzzusammensetzung für ein Abdichtungsmaterial»

[0026] The melt mass flow rate (hereinafter also referred to as MFR, 190 °C, 2160 g loading) of the resin composition for a sealing material is preferably from 1 g / 10 min to 100 g / 10 min, more preferably from 5 g / 10 min to 50 g / 10 min, further preferably from 8 g / 10 min to 30 g / 10 min, particularly preferably from 10 g / 10 min to 30 g / 10 min, with regard to further improvements in peelability and peelability with respect to a substrate.

[0027] The MFR of the resin composition for a sealing material is a value measured using a method in accordance with JIS K 7210-1999 under the temperature and loading specified above.

[0028] The method for controlling the MFR of the resin composition for a sealing material so that it lies within the aforementioned range is not particularly limited and examples include adjusting the composition ratio of an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B) and a 4-methyl-1-pentene / propylene copolymer (C), as described below. <<Ethylen / Vinylester-Copolymer (A)> >

[0029] The resin composition for a sealing material according to the present invention comprises an ethylene / vinyl ester copolymer (A).

[0030] The resin composition for a sealing material may include a single type of ethylene / vinyl ester copolymer (A), or it may include two or more types thereof.

[0031] The ethylene / vinyl ester copolymer (A) is a binary copolymer or a multi-component copolymer of ethylene and a polar monomer. The ethylene / vinyl ester copolymer can be a copolymer of ethylene and a single type of polar monomer, or it can be a copolymer of ethylene and two or more types of polar monomer.

[0032] The content of the structural units derived from the polar monomer in the ethylene / vinyl ester copolymer (A) is preferably from 1 wt% to 30 wt%, more preferably from 2 wt% to 30 wt%, and more preferably from 3 wt% to 30 wt%, with respect to the total structural units, with regard to further improvements in the peelability and peelability of a substrate.

[0033] If the resin composition for a sealing material comprises two or more types of ethylene / vinyl ester copolymer (A) with structural units of the same type but different compositional ratios, the total content of the polar monomer in the copolymers is preferably within the range given above.

[0034] If the resin composition for a sealing material comprises a styrene elastomer (D), as described below, the content of the structural units derived from the polar monomer (especially vinyl acetate) in the ethylene / vinyl ester copolymer (A) is, with respect to the total structural units, preferably from 1 wt% to 30 wt%, more preferably from 2 wt% to 30 wt%, further preferably from 3 wt% to 30 wt%, even more preferably from 5 wt% to 30 wt%, particularly preferably from 5 wt% to 26 wt%, most preferably from 5 wt% to 15 wt%, with regard to further improvements in peelability and peelability with respect to a substrate.

[0035] The ethylene / vinyl ester copolymer (A) is preferably an ethylene / vinyl acetate copolymer.

[0036] The content of the structural units derived from vinyl acetate (hereinafter also referred to as the content of the vinyl acetate unit) in the ethylene / vinyl ester copolymer (A) is preferably from 1 wt% to 30 wt%, more preferably from 5 wt% to 30 wt%, with respect to the total structural units.

[0037] If the content of the vinyl acetate unit is 1% by mass or more, the peel strength with respect to a substrate of the resin composition for a sealing material tends to be more favorable.

[0038] If the vinyl acetate content is 30% by mass or less, the peelability and peelability of a resin composition substrate for a sealing material tend to be more favorable.

[0039] The ethylene / vinyl ester copolymer (A) preferably has a melt mass flow rate (MFR) at 190 °C and 2160 g loading of 1 g / 10 min to 15 g / 10 min, more preferably of 2 g / 10 min to 10 g / 10 min, with the viewpoint of improving processability and adhesion strength by heat sealing.

[0040] If the melt flow rate is 1 g / 10 min or more, the adhesion strength by heat sealing tends to be more favorable. If the melt flow rate is 15 g / 10 min or more, the processability tends to be more favorable.

[0041] If the resin composition for a sealing material comprises two or more types of ethylene / vinyl ester copolymer (A), the mixture thereof preferably has a melt flow rate within the aforementioned range.

[0042] The melt mass flow rate of the ethylene / vinyl ester copolymer is a value measured by a method in accordance with JIS K 7210-1999 under the temperature and loading specified above.

[0043] The content of the ethylene / vinyl ester copolymer (A) in relation to the total mass of the resin composition for a sealing material is preferably 10 wt% or more, more preferably 20 wt% or more, further preferably 50 wt% or more, and particularly preferably 60 wt% or more, with the aim of further improving the peel resistance. The content of the ethylene / vinyl ester copolymer (A) in relation to the total mass of the resin composition for a sealing material is preferably 80 wt% or less, with regard to processability.

[0044] The content of the structural units derived from the polar monomer (vinyl acetate) in the ethylene / vinyl ester copolymer (A) in relation to the total mass of the resin composition for a sealing material is preferably from 0.1 wt% to 24 wt%, more preferably from 1 wt% to 20 wt%, and further preferably from 5 wt% to 20 wt%.

[0045] If the content of structural units derived from the vinyl ester (vinyl acetate) is 0.1% by mass or more, the resin composition for a sealing material tends to exhibit a more favorable peel resistance with respect to a substrate.

[0046] If the content of structural units derived from the vinyl ester (vinyl acetate) is 24% by mass or less, the resin composition for a sealing material tends to exhibit more favorable processability. <<Haftungsvermittelndes Harz (B)> >

[0047] The resin composition for a sealing material according to the present disclosure comprises an adhesion-promoting resin (B).

[0048] The resin composition for a sealing material may include a single type of adhesion-promoting resin (B), or it may include two or more types thereof.

[0049] Examples of the adhesion-promoting resin (B) include an aliphatic hydrocarbon resin, an alicyclic hydrocarbon resin, an aromatic hydrocarbon resin, a styrene resin, a terpene resin and turpentine resins.

[0050] Examples of aliphatic hydrocarbon resin include a polymer obtained from a monomer starting material containing a C4-C5 monoolefin or C4-C5 diolefin such as 1-butene, isobutylene, butadiene, 1,3-pentadiene, isoprene or piperylene as the main component.

[0051] Examples of alicyclic hydrocarbon resins include a resin obtained by polymerizing a product obtained by cyclization and dimerization of a diene compound in a used C4-C5 fraction; a resin obtained by polymerizing a cyclic monomer such as cyclopentadiene; and a resin obtained by core hydrogenation of an aromatic hydrocarbon resin.

[0052] Examples of aromatic hydrocarbon resin include a polymer obtained from a monomer starting material that is a vinylaromatic C9-C 10 -contains hydrocarbon monomers such as vinyltoluene, indene or α-methylstyrene as the main component.

[0053] Examples of styrene resin include a polymer obtained from a monomer starting material containing styrene, vinyltoluene, α-methylstyrene, isopropenyltoluene or the like as the main component.

[0054] Examples of the terpene resin include an α-pinene polymer, a β-pinene polymer, a dipentene polymer, a terpene-phenol copolymer, an α-pinene / phenol copolymer, and a hydrogenated terpene resin.

[0055] Examples of turpentine resins include turpentine resin, polymerized turpentine resin, hydrogenated turpentine resin, turpentine resin ester, a turpentine resin-modified phenolic resin, and an ester of a turpentine resin-modified phenolic resin.

[0056] The adhesion-promoting resin is preferably an alicyclic hydrocarbon resin, an aliphatic hydrocarbon resin or a terpene resin (especially hydrogenated terpene), more preferably an alicyclic hydrocarbon resin.

[0057] The adhesion-promoting resin preferably has a softening point of 70 °C to 150 °C, measured using a ring and ball method, more preferably of 100 °C to 130 °C.

[0058] The softening point measured using a ring and ball method is a value measured using a method according to JIS K 6863 (1994).

[0059] The content of the adhesion-promoting resin (B) in relation to the total mass of the resin composition for a sealing material is preferably 3% by mass or more, from the point of view of a further improvement in peel resistance.

[0060] The content of the adhesion-promoting resin (B) in relation to the total mass of the resin composition for a sealing material is preferably 35% by mass or less, more preferably 30% by mass or less, from the point of view of processability. <<4-Methyl-1-pentene / α-Propylene copolymer (C)>>

[0061] The resin composition for a sealing material according to the present disclosure comprises a 4-methyl-1-pentene / α-propylene copolymer (C).

[0062] The 4-methyl-1-pentene / propylene copolymer (C) is a copolymer containing structural units derived from 4-methyl-1-pentene and structural units derived from propylene (with the exception of 4-methyl-1-pentene, the same applies below).

[0063] The 4-methyl-1-pentene / propylene copolymer (C) preferably contains structural units derived from 4-methyl-1-pentene in an amount of 15 mol% to 75 mol% with respect to the total structural units, more preferably 20 mol% to 75 mol%, and further preferably 60 mol% to 75 mol%, with regard to the peelability and peelability of a substrate.

[0064] The 4-methyl-1-pentene / propylene copolymer (C) preferably contains propylene-derived structural units in an amount of 25 mol% to 85 mol% with respect to the total structural units, more preferably from 25 mol% to 80 mol%, and further preferably from 25 mol% to 40 mol%.

[0065] The total amount of structural units derived from 4-methyl-1-pentene and those derived from propylene is preferably 100 mol%.

[0066] It is possible to regulate the 4-methyl-1-pentene / propylene copolymer (C) to have a melting point (Tm) of less than 110 °C as measured by differential scanning calorimetry (DSC), or to have no melting point (Tm), by adjusting the proportions of the structural units derived from 4-methyl-1-pentene and the structural units derived from propylene so that they are each within the aforementioned ranges.

[0067] The 4-methyl-1-pentene / propylene copolymer (C) can be a block copolymer or a statistical copolymer. From the perspective of transparency and processability, the 4-methyl-1-pentene / propylene copolymer (C) is preferably a statistical copolymer.

[0068] From the point of view of improving copolymerizability and dispersibility, the α-olefin propylene is suitable.

[0069] The 4-methyl-1-pentene / propylene copolymer (C) may contain structural units derived from a polymerizable compound other than 4-methyl-1-pentene or propylene having 2 to 20 carbon atoms (hereinafter also referred to as polymerizable compound).

[0070] Examples of polymerizable compounds include vinyl compounds with a cyclic structure such as styrene, vinylcyclopentene, vinylcyclohexane, and vinylnorbornane; vinyl esters such as vinyl acetate; unsaturated organic acids or derivatives thereof such as maleic anhydride; conjugated dienes such as butadiene, isoprene, pentadiene, and 2,3-dimethylbutadiene; and non-conjugated polyenes such as 1,4-hexadiene, 1,6-octadiene, 2-methyl-1,5-hexadiene, 6-methyl-1,5-heptadiene, 7-methyl-1,6-octadiene, dicyclopentadiene, cyclohexadiene, dicyclooctadiene, methylenenorbornene, 5-vinylnorbornene, 5-ethylidene-2-norbornene, 5-methylene-2-norbornene, 5-isopropylidene-2-norbornene, 6-chloromethyl-5-isopropenyl-2-norbornene, 2,3-diisopropylidene-5-norbornene, 2-ethylidene-3-isopropylidene-5-norbornene and 2-propenyl-2,2-norbornadiene.

[0071] The 4-methyl-1-pentene / propylene copolymer (C) may include structural units derived from the polymerizable compound as described above in an amount of 10 mol% or less, or 5 mol% or less, or 3 mol% or less, in relation to the total structural units of all polymerizable compounds contained in the 4-methyl-1-pentene / propylene copolymer (C). (Loss factor tan δ)

[0072] The 4-methyl-1-pentene / propylene copolymer (C) preferably has a maximum value of the loss factor (tan δ) in a range from -40 °C to 150 °C, measured by dynamic viscoelastic measurement at a frequency of 1.6 Hz and a temperature increase rate of 2 °C / min, (hereinafter also referred to as maximum value of tan δ) of 1.0 to 5.0, more preferably of 1.5 to 5.0, further preferably of 2.0 to 4.0, with the viewpoint of improving the peelability properties with respect to a substrate.

[0073] The conditions for measuring the maximum value of tan δ of the 4-methyl-1-pentene / propylene copolymer (C) are as follows.

[0074] A 3 mm thick press plate is produced from the 4-methyl-1-pentene / propylene copolymer (C) by applying a pressure of 10 MPa with a hydraulic hot press machine (Shinto Metal Industries Corporation) heated to 190 °C, and a test piece measuring 45 mm x 10 mm x 3 mm for measurement is obtained from the press plate.

[0075] The temperature dependence of the dynamic viscosity in a temperature range of -40 °C to 180 °C of the test piece is measured with a viscoelastometer (MCR 301, Anton Paar) at a frequency of 1.6 Hz and a temperature increase rate of 2 °C / min, and the temperature at which a loss factor (tan δ), derived from a glass transition temperature, is at its maximum (hereinafter also referred to as peak temperature) and the value of the loss factor (tan δ) are measured.

[0076] The temperature at which the loss factor (tan δ) is at its maximum (peak temperature) is not particularly limited and can, for example, range from -40 °C to 180 °C, preferably from 0 °C to 50 °C, more preferably from 10 °C to 40 °C.

[0077] The method for controlling the maximum value of the loss factor (tan δ) of the 4-methyl-1-pentene / propylene copolymer (C) is not particularly limited, and examples include adjusting the composition ratio of the structural units derived from 4-methyl-1-pentene and those derived from propylene. (marginal viscosity)

[0078] The 4-methyl-1-pentene / propylene copolymer (C) has an intrinsic viscosity [η], measured in decalin at 135 °C, of ​​0.5 dl / g to 5.0 dl / g, more preferably of 1.0 dl / g to 4.0 dl / g, and more preferably of 1.2 dl / g to 3.5 dl / g.

[0079] The value of the intrinsic viscosity [η] can be adjusted by the amount of hydrogen added in a polymerization process to obtain the 4-methyl-1-pentene / propylene copolymer (C).

[0080] If the intrinsic viscosity [η] lies within the aforementioned range, the resin composition for a sealing material tends to exhibit favorable flowability in a process for manufacturing or shaping the resin composition for a sealing material. Furthermore, the dispersibility of the 4-methyl-1-pentene / propylene copolymer (C) tends to improve with respect to the ethylene / vinyl ester copolymer (A).

[0081] The intrinsic viscosity [η] of the 4-methyl-1-pentene / propylene copolymer (C) can be measured using the following method.

[0082] Approximately 20 mg of the 4-methyl-1-pentene / propylene copolymer (C) are dissolved in 25 ml of decalin, and the specific viscosity (ηsp) of the decalin solution is measured using an Ubbelohde viscometer in an oil bath at 135 °C. The decalin solution is diluted by adding 5 ml of decalin, and the specific viscosity (ηsp) of the diluted decalin solution is measured in the same manner. The dilution is repeated two further times, and the value of ηsp / C, obtained by extrapolating the concentration (C) to zero, is determined as the limiting viscosity [η] (unit: dl / g). (Molecular weight distribution (Mw / Mn))

[0083] The 4-methyl-1-pentene / propylene copolymer (C) preferably has a molecular weight distribution (Mw / Mn) corresponding to a ratio of the weight mean of the molecular weight (Mw) to the number mean of the molecular weight (Mn) measured by gel permeation chromatography (GPC) of 1.0 to 3.5, more preferably of 1.0 to 3.0, and further preferably of 1.5 to 2.5.

[0084] The molecular weight distribution (Mw / Mn) can be adjusted, for example, by selecting the type of catalyst for olefin polymerization, as described later.

[0085] A resin composition for a sealing material comprising a 4-methyl-1-pentene / propylene copolymer (C) with a molecular weight distribution (Mw / Mn) within the aforementioned range tends to contain a smaller amount of relatively low-molecular-weight components, and leaching of these components is suppressed. Furthermore, when granules or films are produced from a resin composition comprising a 4-methyl-1-pentene / propylene copolymer (C) for a sealing material, the occurrence of blocking tends to be suppressed, and the film properties (especially the mechanical properties) tend to be advantageous.

[0086] The molecular weight distribution (Mw / Mn), which corresponds to a ratio of the weight mean of the molecular weight (Mw) to the number mean of the molecular weight (Mn), of the 4-methyl-1-pentene / propylene copolymer (C) can be measured using a standard polystyrene equivalent method by performing gel permeation chromatography (GPC) under the following conditions.

[0087] Measuring device: GPC (Type ALC / GPC 150-C plus, integrated with differential refractometer, Waters) Columns: GMH6-HT (Tosoh Corporation) x 2 and GMH6-HTL (Tosoh Corporation) x 2, connected in series Eluent: o-Dichlorobenzene Column temperature: 140 °C Flow rate: 1.0 ml / min (Density)

[0088] The 4-methyl-1-pentene / propylene copolymer (C) has a density of 825 kg / m³ 3 up to 860 kg / m² 3 , more strongly preferred than 830 kg / m² 3 up to 855 kg / m² 3 , further preferred from 830 kg / m 3 up to 850 kg / m²3 , especially preferred from 830 kg / m³ 3 up to 845 kg / m 3 , on.

[0089] The density value can be adjusted by the type or amount of propylene to be copolymerized with 4-methyl-1-pentene.

[0090] If the density of the 4-methyl-1-pentene / propylene copolymer (C) is within the above range, the resin composition for a sealing material tends to exhibit favorable heat resistance and offer the advantage of weight savings.

[0091] The density of the 4-methyl-1-pentene / propylene copolymer (C) is a value measured using a method according to JIS K 7112 (density gradient tube method). (MFR)

[0092] The 4-methyl-1-pentene / propylene copolymer (C) preferably has a melt mass flow rate of 0.01 g / 10 min to 100 g / 10 min, more preferably of 0.5 g / 10 min to 50 g / 10 min, and further preferably of 0.5 g / 10 min to 30 g / 10 min, with regard to flowability during processing and further improvement of peelability and peelability with respect to a substrate.

[0093] The melt mass flow rate (MFR) of the 4-methyl-1-pentene / propylene copolymer (C) is a value measured by a method according to ASTM D 1238 at 230 °C and 2.16 kg loading.

[0094] The method for adjusting the melt mass flow rate (MFR) of the 4-methyl-1-pentene / propylene copolymer (C) so that it lies within the aforementioned range is not particularly limited, and examples of this include adjusting the compositional ratio of the structural units derived from 4-methyl-1-pentene and those derived from propylene. (Melting point)

[0095] The 4-methyl-1-pentene / propylene copolymer (C) preferably has a melting point (Tm) of less than 110 °C as measured by differential scanning calorimetry (DSC) or has no melting point, more preferably has a melting point of less than 85 °C or has no melting point.

[0096] The resin composition for a sealing material comprising a 4-methyl-1-pentene / propylene copolymer (C) having a melting point (Tm) of less than 110 °C or no melting point, tends to exhibit excellent processability.

[0097] The melting point (Tm) of the 4-methyl-1-pentene / propylene copolymer (C) can be measured by differential scanning calorimetry according to the following procedure.

[0098] Approximately 5 mg of the 4-methyl-1-pentene / propylene copolymer (C) is placed in an aluminum crucible of a differential scanning calorimeter (DSC 220C, Seiko Instruments Inc.) and sealed. The temperature is increased from room temperature (23 °C) to 200 °C at a rate of 10 °C / min. The temperature is held at 200 °C for 5 minutes to completely melt the 4-methyl-1-pentene / propylene copolymer (C), and then cooled to -50 °C at a rate of 10 °C / min. After holding the temperature at -50 °C for 5 minutes, a second heating to 200 °C is performed at a rate of 10 °C / min. A peak temperature (°C) recorded during the second heating is determined to be the melting point (Tm) of the 4-methyl-1-pentene / propylene copolymer (C).If no melting peak is detected during the second heating in a range of -50 °C to 200 °C, it is determined that the 4-methyl-1-pentene / propylene copolymer (C) has no melting point. If more than one peak is detected, the peak at the highest temperature is determined to be the melting point (Tm) of the 4-methyl-1-pentene / propylene copolymer (C).

[0099] Examples of the process for obtaining a 4-methyl-1-pentene / propylene copolymer (C) that has no melting point or has a melting point within the foregoing range include a process of adjusting the stereoregularity of the 4-methyl-1-pentene / propylene copolymer (C) using a catalyst for olefin polymerization; and a process of adjusting the content of propylene-derived structural units in the 4-methyl-1-pentene / propylene copolymer (C). (Synthesis)

[0100] The 4-methyl-1-pentene / propylene copolymer (C) can be obtained as a commercial product or can be synthesized. For example, the 4-methyl-1-pentene / propylene copolymer (C) can be synthesized by polymerizing 4-methyl-1-pentene and propylene, as mentioned above, and optionally other polymerizable compounds, as mentioned above, in the presence of a catalyst for olefin polymerization.

[0101] Examples of catalysts for olefin polymerization include a metallocene catalyst.

[0102] Preferred examples of the metallocene catalyst include those described in International Publication No. 01 / 53369, International Publication No. 01 / 27124, JP-A No. H03-193796, JP-A No. H02-41303, International Publication No. 06 / 025540 and International Publication No. 2014 / 050817.

[0103] The content of the 4-methyl-1-pentene / propylene copolymer (C) in relation to the total mass of the resin composition for a sealing material is from 1 wt% to 20 wt%, preferably from 3 wt% to 16 wt%, more preferably from 3.5 wt% to 16 wt%, and more preferably from 4 wt% to 16 wt%.

[0104] If the resin composition for a sealing material comprises a styrene elastomer (D) as described below, the content of the 4-methyl-1-pentene / propylene copolymer (C) in relation to the total mass of the resin composition for a sealing material is 1 wt% to 20 wt%, preferably 6 wt% to 14 wt%, more preferably 7 wt% to 12 wt%.

[0105] If the content of the 4-methyl-1-pentene / propylene copolymer (C) in relation to the total mass of the resin composition for a sealing material is 1 wt% or more, the resin composition for a sealing material tends to exhibit more favorable peelability properties.

[0106] If the content of the 4-methyl-1-pentene / propylene copolymer (C) in relation to the total mass of the resin composition for a sealing material is 20 wt% or less, the resin composition for a sealing material tends to exhibit a more favorable peel resistance. <<Styrol-Elastomer (D)> >

[0107] The resin composition for a sealing material may include a styrene elastomer (D).

[0108] The resin composition for a sealing material may include a single type of styrene elastomer (D), or it may include two or more types thereof.

[0109] The styrene elastomer (D) is a block copolymer with a soft segment formed from a diene block (diene polymer) and a hard segment formed from a styrene block (styrene polymer). The block copolymer can be a hydrogenated product.

[0110] Specific examples of the block copolymer and its hydrogenated products include a styrene-butadiene block copolymer (SB), a styrene-butadiene-styrene block copolymer (SBS), a styrene-isoprene block copolymer (SI), a styrene-isoprene-styrene block copolymer (SIS), and hydrogenated products thereof.

[0111] A hydrogenated product of a block copolymer can be a block copolymer in which the entire styrene block and the entire diene block are hydrogenated, a block copolymer in which only the diene block is hydrogenated, or a block copolymer in which part of the styrene block and part of the diene block are hydrogenated (partially hydrogenated product).

[0112] Among the block copolymers and hydrogenated products thereof, a styrene-ethylene / butylene block copolymer (SEB), which is a hydrogenated product of a styrene-butadiene block copolymer (SB), a styrene-ethylene / butylene-styrene block copolymer (SEBS), which is a hydrogenated product of a styrene-butadiene-styrene block copolymer (SBS), and a styrene-ethylene / propylene-styrene block copolymer (SEPS), which is a hydrogenated product of a styrene-isoprene-styrene block copolymer (SIS), are preferred with regard to thermal stability during injection molding, stability during processing, suppressed amount of deteriorated products, and suppressed odor.

[0113] Among these, a styrene-ethylene / butylene-styrene block copolymer (SEBS) and a styrene-ethylene / propylene-styrene block copolymer (SEPS) are more preferred, and a styrene-ethylene / butylene-styrene block copolymer (SEBS) is further preferred.

[0114] The styrene elastomer (D) is a block copolymer and can be an acid-modified styrene elastomer, which is a styrene elastomer that undergoes graft modification with at least one compound selected from an unsaturated carboxylic acid and a derivative of an unsaturated carboxylic acid.

[0115] Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, 2-ethylacrylic acid, crotonic acid, maleic acid, fumaric acid, and itaconic acid. Among these, the unsaturated carboxylic acid is preferably at least one selected from acrylic acid, methacrylic acid, maleic acid, fumaric acid, and itaconic acid, with maleic acid being more preferred, for reasons of efficiency in the production of the acid-modified styrene elastomer and for health reasons.

[0116] Examples of derivatives of unsaturated carboxylic acids include anhydrides such as maleic anhydride, phthalic anhydride, and itaconic anhydride; acid esters such as monomethyl maleate and monoethyl maleate; acid amides; and acid halides. Among these, maleic anhydride is preferred.

[0117] It is possible to use a single type of unsaturated carboxylic acid or a derivative thereof, or to use two or more types thereof.

[0118] It is possible to use an acid-modified styrene elastomer, obtained by grafting at least one compound selected from an unsaturated carboxylic acid and a derivative of an unsaturated carboxylic acid onto a molten styrene elastomer, in the presence of a radical initiator. It is possible to use a radical initiator commonly used for a polyolefin grafting reaction.

[0119] The acid number of the acid-modified styrene elastomer is preferably greater than 0 mg CH3ONa / g and less than 20 mg CH3ONa / g, more preferably greater than 0 mg CH3ONa / g and less than 11 mg CH3ONa / g, and further preferably from 0.5 mg CH3ONa / g to 11 mg CH3ONa / g.

[0120] The MFR (melt flow rate; according to ASTM D 1238, 190 °C, 2160 g loading) is not particularly limited and is generally from 0.1 g / 10 min to 100 g / 10 min, preferably from 0.5 g / 10 min to 50 g / 10 min.

[0121] The content of the styrene elastomer (D) in relation to the total mass of the resin composition for a sealing material is preferably from 1 wt% to 15 wt%, more preferably from 2 wt% to 10 wt%, and further preferably from 2 wt% to 8 wt%.

[0122] If the content of the styrene elastomer (D) in relation to the total mass of the resin composition for a sealing material is 1 mass % or more, the resin composition for a sealing material tends to exhibit a more favorable peel resistance with respect to a substrate.

[0123] If the content of the styrene elastomer (D) in relation to the total mass of the resin composition for a sealing material is 15 mass % or less, the resin composition for a sealing material tends to exhibit more favorable peelability properties with respect to a substrate. <<Andere Komponenten> >

[0124] The resin composition for a sealing material according to the disclosure may include components other than those described above.

[0125] Examples of the other components include an additive such as an antioxidant, a heat stabilizer, a light stabilizer, an antistatic agent, a lubricant, a coloring agent, a lubricant and a release agent, preferably a lubricant and a release agent.

[0126] The content of the additive in relation to the total mass of the resin component in the resin composition for a sealing material is preferably from 0.01 wt% to 3 wt%, more preferably from 0.01 wt% to 2 wt%. <<Verfahren zur Herstellung einer Harzzusammensetzung für ein Abdichtungsmaterial> >

[0127] The process for producing the resin composition for a sealing material according to the disclosure is not particularly limited, and examples include a process of mixing an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B), a 4-methyl-1-pentene / α-propylene copolymer (C) and a styrene elastomer (D) or optionally (a) further component(s) by dry mixing; and a process of melt kneading an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B), a 4-methyl-1-pentene / α-propylene copolymer (C) and a styrene elastomer (D) or optionally (a) further component(s) with an extruder. <<Bevorzugte Zwecke> >

[0128] The resin composition for a sealing material according to the disclosure can be used for various purposes where a high level of peel resistance and peelability is required with respect to a substrate.

[0129] The purpose of the resin composition for a sealing material is not particularly limited. The resin composition for a sealing material is preferably used as packaging material.

[0130] Examples of packaging material include lid material for packaging food, toys, stationery, household goods, cosmetics, medicines, quasi-pharmaceutical products, medical instruments and the like. - Multi-layered body -

[0131] The multilayer body according to the present disclosure comprises a carrier material and a sealing layer, and the sealing layer comprises the resin composition for a sealing material according to the present disclosure.

[0132] Since the multilayer body according to the present disclosure includes a sealing layer comprising the resin composition for a sealing material according to the present disclosure, the multilayer body exhibits excellent peel resistance and excellent peelability with respect to a substrate. <<Trägermaterial> >

[0133] The material for the backing material is not particularly limited.

[0134] The substrate material can have either a single-layer structure or a multi-layer structure with two or more layers.

[0135] Examples of the support material include stretched or unstretched films made of polyester such as polyethylene terephthalate, polyamide, polypropylene, polyethylene, ethylene / vinyl acetate copolymer, ethylene / unsaturated carboxylic ester copolymer, ethylene / unsaturated carboxyl copolymer or an ionomer thereof, ethylene / vinyl alcohol copolymer, paper, an aluminum foil, a film vapor-deposited with a material such as aluminum, silicon dioxide or aluminum oxide, and a film coated with a gas barrier material such as polyvinylidene chloride or polyvinyl alcohol.

[0136] The substrate material can undergo surface treatment to improve adhesion to a sealant. Specific examples of surface treatment include corona treatment, plasma treatment, and anchor coating treatment. < <abdichtungsschicht>>

[0137] The sealing layer is a layer comprising the resin composition for a sealing material according to the present disclosure.

[0138] The sealing layer can have either a single-layer structure or a multi-layer structure with two or more layers.

[0139] The sealing layer is produced, for example, by melt extrusion using the resin composition for a sealing material according to the present disclosure (and an optional component such as an additive).

[0140] The content of the resin composition for a sealing material according to the present disclosure in relation to the total mass of the sealing layer is preferably 80% by mass or more, more preferably 90% by mass or more. <<Zusätzliche Schicht> >

[0141] The multilayer body according to the disclosure may have a layer other than the support material and the sealing layer (hereinafter also referred to as the additional layer).

[0142] Examples of the additional layer include a foam layer, a metal layer, a layer of inorganic material, a gas barrier resin layer, an antistatic layer, a hard coating layer, an adhesive layer, an antireflective layer, and an antifouling layer.

[0143] The multilayered body can have a single additional layer or two or more additional layers in combination. The adhesive layer refers to a layer placed between a pair of layers to improve their adhesion.

[0144] The shape of the multilayered body according to the present disclosure is not particularly restricted and can, for example, be a layered shape (i.e., a foil shape).

[0145] The thickness of the multilayer body according to the present disclosure is not particularly limited, and is preferably from 40 µm to 300 µm, more preferably from 50 µm to 300 µm, and further preferably from 50 µm to 200 µm.

[0146] The thickness of the sealing layer in the multilayer body is not particularly limited, and is preferably from 1 µm to 500 µm, more preferably from 2 µm to 300 µm, and further preferably from 3 µm to 200 µm.

[0147] The thickness of the support material in the multilayer body (if the support material is multilayered, the total thickness of the layers) is not particularly limited, and is preferably from 4 µm to 300 µm, more preferably from 5 µm to 300 µm, and more preferably from 10 µm to 200 µm. <<Bevorzugtes Verfahren zur Herstellung eines mehrschichtigen Körpers> >

[0148] The multilayered body according to the present disclosure can be produced using a known method.

[0149] Examples of manufacturing processes for the multilayer body include extrusion lamination, coextrusion blow molding, and T-nozzle coextrusion. Of these, extrusion lamination is preferred.

[0150] The multilayer body according to the present disclosure can optionally be subjected to monoaxial or biaxial stretching to a desired degree. <<Bevorzugte Zwecke des mehrschichtigen Körpers> >

[0151] The purpose of the multilayered body according to the present disclosure is not particularly limited.

[0152] Preferred purposes of the multilayer body according to the present disclosure are the same as the preferred purposes of the resin composition for a sealing material according to the present disclosure, as described above. - Packaging material -

[0153] The packaging material according to the present disclosure comprises the multilayer body according to the present disclosure, i.e., a multilayer body comprising a carrier material and a sealing layer comprising the resin composition for a sealing material according to the present disclosure.

[0154] The packaging material according to the present disclosure can, for example, be used as a lid material.

[0155] The packaging material according to the present disclosure exhibits excellent peelability and excellent peelability with respect to a substrate.

[0156] The packaging material according to the present disclosure exhibits excellent peel strength and excellent removal properties, particularly with respect to a substrate of a container or the like, made from an amorphous polyester. Accordingly, the packaging material according to the present disclosure is used in particular as a lid material for a container made from an amorphous polyester. - Packaging container -

[0157] The packaging container according to the present disclosure has a main container part with an opening and a lid that closes the opening. The lid is formed from the packaging material according to the present disclosure.

[0158] Since the packaging container according to the present disclosure has a lid formed from the packaging material according to the present disclosure, the lid exhibits excellent peel resistance and excellent removal properties with respect to the container main part with an opening.

[0159] The packaging container according to the present disclosure is preferably a packaging container in which the main part of the container comprises an amorphous polyester, more preferably a packaging container in which the main part of the container comprises an amorphous polyethylene terephthalate.

[0160] The main part of the container can be made of a material other than an amorphous polyester, such as an amorphous polyethylene terephthalate, for example polypropylene, polycarbonate, or polyvinylidene chloride.

[0161] The packaging container according to the present disclosure is used as a packaging container for food, medicines, industrial materials, consumer goods, cosmetics or the like, in particular as a packaging container for food or medicines. [Examples]

[0162] The present invention is explained below by reference to the examples, but the invention is not limited to the examples. The materials, contents, compositions, processes, and the like shown in the examples can be modified as necessary without derailing the purpose of the present disclosure. Unless otherwise stated, "part" refers to "part by mass."

[0163] The MFR of the materials used is measured using the method described in the embodiments for implementing the invention.

[0164] In the following, the “content of the ethylene unit” and the “content of the vinyl acetate structural unit” refer to the content of structural units derived from ethylene and the content of structural units derived from vinyl acetate, respectively.

[0165] The details of the components used for the resin compositions for a sealing material in the examples and comparison examples are as follows. (Ethylene / vinyl ester copolymer (A)) (EVA-1) Type: Ethylene / vinyl acetate copolymer Vinyl acetate structural unit content (VA content): 10 wt% MFR (190 °C, 2160 g loading): 9 g / 10 min (EVA-2) Type: Ethylene / Vinyl acetate copolymer Vinyl acetate structural unit content (VA content): 10 wt% MFR (190 °C, 2160 g loading): 3 g / 10 min (EVA-3) Type: Ethylene / Vinyl acetate copolymer Vinyl acetate structural unit content (VA content): 28 wt% MFR (190 °C, 2160 g loading): 6 g / 10 min (EVA-4) Type: Ethylene / Vinyl acetate copolymer Vinyl acetate structural unit content (VA content): 19 wt% MFR (190 °C, 2160 g loading): 2.5 g / 10 min (Adhesion-promoting resin (B))

[0166] Type: Alicyclic hydrocarbon resin (ARKON P-115, Arakawa Chemical Industries, Ltd.) Melting point, measured using the ring and ball method: 115 °C (4-Methyl-1-pentene / propylene copolymer (C))

[0167] Type: 4-methyl-1-pentene / propylene copolymer (ABSORTOMER™ EP-1001, Mitsui Chemicals, Inc.) Density: 840 kg / m³ 3 , MFR (230 °C, 2160 g load): 10 g / 10 min, no melting point, peak temperature of the loss factor (tan δ), measured at a frequency of 1.6 Hz and a temperature increase rate of 2 °C / min: 30 °C, maximum value of the loss factor (tan δ): 2.7 (Styrene elastomer (D))(SEBS-1)

[0168] Type: Maleic anhydride modified styrene-ethylene / butylene-styrene block copolymer (TUFTEC M1943, Asahi Kasei Corporation) Acid value: 10 mg CH3ONa / g, MFR (190 °C, 2160 g loading): 0.5 g / 10 min (SEBS-2)

[0169] Type: Styrene-ethylene / butylene-styrene block copolymer (KRATON G1657, Kraton Corporation) MFR (190 °C, 2160 g load): 2.8 g / 10 min (Comparison olefin copolymer)

[0170] Ethylene / 1-Butene Copolymer (TAFMER™ A4085S, Mitsui Chemicals, Inc.) Density: 885 kg / m³ 3 , MFR (190 °C, 2160 g load): 3.6 g / 10 min (Low-density polyethylene: LDPE)

[0171] MFR (190 °C, 2160 g load): 3.7 g / 10 min, density: 917 kg / m³ 3 (Other components: Additives)

[0172] Lubricant (PEG): Polyethylene glycol (Nippon Fine Chemical Co., Ltd.) Release agent (ELA): Erucamide (NOF Corporation) [Examples 1-6 and Comparative Examples 1-6] - Production of a resin composition for a sealing material -

[0173] The components in the quantities shown in Table 1 were melted and kneaded at a resin temperature of 180 °C using a monoaxial extruder (diameter: 65 mm, L / D: 26, screw: Dulmage type threaded screw, Nakatani Kikai KK), thereby producing a resin composition for a sealing material. - Production of a test piece for evaluation -

[0174] A four-layer film comprising a PET layer (12 µm), a PE layer (15 µm), a sealing layer (30 µm) and a silicone PET layer (25 µm) was produced using a single extrusion lamination machine (diameter: 40 mm, L / D: 32, Tanabe Plastics Machinery Co., Ltd.) at a resin temperature at the nozzle outlet of 220 °C and a transfer speed of 30 m / min.

[0175] Specifically, a sealing layer of 30 µm thickness was formed by extruding the resin composition for a sealing material from a T-nozzle onto a PE layer of a two-layer carrier material comprising a PET layer (12 µm) and a PE layer (15 µm), and a silicone PET layer (thickness: 25 µm, CERAPEEL™, Toray Advanced Film Co., Ltd.) was inserted from the sand carrier material side.

[0176] The silicone PET layer was removed from the four-layer film and used as a test piece for evaluation. - Evaluation -

[0177] The following evaluation was performed using the test specimen. Containers made of amorphous polyethylene terephthalate (hereinafter also referred to as A-PET containers), TAPS92-375 (Takeuchisangyo Corporation) and FP92-375 (Fujinap Co., Ltd.), were used for the evaluation. The results are presented in Table 1. The blank space in Table 1 indicates that the corresponding component is not included in the resin composition for a sealing material. <<Bewertung der Abzieheigenschaften> >

[0178] The evaluation of the peelability properties was carried out using the following procedure.

[0179] An A-PET container was placed in a cup holder of a cup sealing machine (Eshin Pack Industry Co., Ltd.), and a 10 cm x 10 cm test piece was placed on the A-PET container with the sealing layer facing the container. Heat sealing was then performed at the heating temperature shown in Table 1, with a sealing time of 1 second and a sealing pressure of 0.1 MPa. After heat sealing, the A-PET container sealed with the test piece was left to stand at room temperature (23 °C) for 24 hours.

[0180] The test piece was then manually peeled from the A-PET container at 23 °C, and the presence or absence of a peeling noise (whirring) was evaluated according to the following criteria. In Table 1, "not connected" refers to a test piece that was not connected to the A-PET container under the above conditions. (Evaluation criteria) A: No peeling phenomenon occurs in connection with whirring, and the test piece is peeled off without any problems. B: A pull-off phenomenon occurs in connection with whirring. <<Bewertung der Ablösefestigkeit> >

[0181] The peel resistance was evaluated using the following method.

[0182] An A-PET container was placed in a cup holder of a cup sealing machine (Eshin Pack Industry Co., Ltd.), and a 10 cm x 10 cm test piece was placed on the A-PET container with the sealing layer facing the container. Heat sealing was then performed at the heating temperature shown in Table 1, with a sealing time of 1 second and a sealing pressure of 0.1 MPa. After heat sealing, the A-PET container sealed with the test piece was left to stand at room temperature (23 °C) for 24 hours.

[0183] The A-PET container was then fixed to a pull-off test device (IM-20A, Intesco Co., Ltd.). The test specimen was pulled off the A-PET container at an initial pull-off angle of 45° and a pull-off speed of 300 mm / min, and the maximum load was determined as the pull-off strength (N) with respect to the A-PET container. In Table 1, “-” indicates that the pull-off strength was not measured because the test specimen was not connected to the A-PET container. Table 1 VA content (mass %) MFR (g / 10 min) Unit Examples Comparative examples 1 2 3 4 5 6 1 2 3 4 5 6 Ethylene / polar monomer copolymer (A) EVA-1 10 9 Mass part 35 33 31 29 33 100 85 90 85 33 EVA-2 10 3 Mass part 43 40 37 36 40 EVA-3 28 6 Mass part 50 EVA-4 19 2,5 Mass part 40 23 Adhesion-promoting resin (B) 3000 Mass part 17 17 17 25 17 17 15 17 17 4-Methyl-1-pentene / propylene copolymer (C 10 Mass part 5 10 15 10 10 10 10 15 10 LDPE 3,7 Mass part 73 Comparison olefin copolymer 3,6 Mass part 10 Other components ELA Mass part 0,10 0,10 0,10 0,10 0,10 0,10 0,1 0,1 PEG 4000 Mass part 0,05 0,05 0,05 0,05 0,05 0,05 0,05 0,05 Resin composition for a sealing material VA salary Mass-% 7,8 7,3 6,8 6,5 10,9 18,4 10,0 8,5 9,0 8,5 7,3 0,0 MFR g / 10 min 14,1 14,4 14,3 26,1 13,6 13,8 9,0 20,8 8,6 8,6 10,8 11,9 A-PET container Takeuchisangyo TAPS92-375 Peel-off properties 160 °C - A A A A A A not connected B A A B B 180 °C - A A A A A A A B A A B B peel resistance 160 °C N 5,9 5,4 3,5 5,7 4,6 4,4 - 4,5 1,3 0,9 6,8 2,9 180 °C N 5,3 5,3 4,8 9,7 6,7 3,4 0,7 6,7 0,8 1,1 7,9 10,3 A-PET container FujinapFP92-375 Peel-off properties 160 °C - A A A A A A not connected B A A B B 180 °C - A A A A A A A B A A B B peel resistance 160 °C N 5,0 7,3 4,3 12 4,6 5,1 - 7,4 0,8 1,3 6,5 13,8 180 °C N 7,7 4,3 6,9 8,1 4,3 3,5 2,0 6,9 0,8 2,0 7,3 14,6 [Examples 7-11 and Comparative Examples 7-12] - Production of a resin composition for a sealing material -

[0184] The resin composition for a sealing material with the composition shown in Table 2 and the test piece were prepared in the same way as in Example 1.

[0185] The following evaluation was performed on the received test specimen. Containers made of amorphous polyethylene terephthalate (A-PET containers), FP92-375 (Fujinap Co., Ltd.), were used for the evaluation. The results are shown in Table 2. The blank space in Table 2 indicates that the corresponding component is not included in the resin composition for a sealing material. <<Bewertung der Abzieheigenschaften> >

[0186] The evaluation of the peelability properties was carried out using the following procedure.

[0187] An A-PET container was placed in a cup holder of a cup sealing machine (Eshin Pack Industry Co., Ltd.), and a 10 cm x 10 cm test piece was placed on the A-PET container with the sealing layer facing the container. Heat sealing was then performed at a heating temperature shown in Table 2, a sealing time of 1 second, and a sealing pressure of 0.1 MPa. After heat sealing, the A-PET container sealed with the test piece was left to stand for one day at room temperature (23 °C). The test piece was then manually removed from the A-PET container at 23 °C, and the presence or absence of a peeling noise (whirring) was evaluated according to the following criteria. (Evaluation criteria) A: No buzzing occurs. B: A low level of buzzing occurs. C: A significant degree of buzzing occurs. <<Bewertung der Ablösefestigkeit> >

[0188] The peel resistance was evaluated using the following method.

[0189] An A-PET container was placed in a cup holder of a cup sealing machine (Eshin Pack Industry Co., Ltd.), and a 10 cm x 10 cm test piece was placed on the A-PET container with the sealing layer facing the container. Heat sealing was then performed at a heating temperature shown in Table 2, a sealing time of 1 second, and a sealing pressure of 0.1 MPa. After heat sealing, the A-PET container sealed with the test piece was left to stand for one day at room temperature (23 °C). Subsequently, the A-PET container was fixed to a peel tester (IM-20A, Intesco Co., Ltd.), and the test piece was peeled off the A-PET container at an initial peel angle of 45° and a peel speed of 300 mm / min. The maximum load (N) was then measured.

[0190] The arithmetic mean of the five measured values ​​of the maximum load (N) was determined as the peel strength (N) with respect to the A-PET container. Table 2 Unit Examples Comparative examples 7 8 9 10 11 7 8 9 10 11 12 Ethylene / polar monomer copolymer (A) EVA-1 Mass part 32 31 30 31 30 100 85 90 85 33 EVA-2 Mass part 40 39 38 39 38 40 Adhesion-promoting resin (B) Mass part 17 17 17 17 17 15 0 0 17 17 4-Methyl-1-pentene / propylene copolymer (C) Mass part 10 10 10 10 10 10 15 10 Styrene elastomer (D) SEBS-1 Mass part 1 3 5 SEBS-2 Mass part 3 5 LDPE Mass part 73 Comparison olefin copolymer Mass part 10 Other components ELA Mass part 0,1 0,1 0,1 0,1 0,1 0,1 0,1 PEG 4000 Mass part 0,05 0,05 0,05 0,05 0,05 0,05 0,05 Total quantity Mass part 100,15 100,15 100,15 100,15 100,15 100,00 100,00 100,00 100,00 100,15 100,15 VA salary Mass-% 7,2 7,0 6,8 7,0 6,8 10 8,5 9,0 8,5 7,3 0 MFR g / 10 min 14 13,4 13,4 14,6 13,3 9 20,8 8,6 8,6 10,8 11,9 Peel-off properties 180 °C - B B B A A A B A A C C peel strength (N) 180 °C N 12,6 12,9 13,4 12,8 7,4 1,0 6,5 1,9 0,9 8,0 11,1

[0191] As shown in Table 1 and Table 2, the resin compositions for a sealing material exhibit excellent peel resistance and excellent peelability properties with respect to an A-PET container comprising an amorphous polyester, compared to the resin compositions for a sealing material in the comparison examples.

[0192] The disclosures of Japanese patent applications No. 2019-064698 and No. 2019-168513 are incorporated herein in their entirety by reference. All publications, patent applications, and technical standards mentioned in this description are incorporated herein by reference to the same extent as if each individual publication, patent application, or technical standard had been specifically and individually identified for inclusion by reference.< / abdichtungsschicht>

Claims

[1] Resin composition for a sealing material comprising an ethylene / vinyl ester copolymer (A), an adhesion-promoting resin (B) and a 4-methyl-1-pentene / propylene copolymer (C), wherein the content of the 4-methyl-1-pentene / propylene copolymer (C) is from 1 wt% to 20 wt% in relation to a total mass of the resin composition for a sealing material. [2] Resin composition for a sealing material according to claim 1, further comprising a styrene elastomer (D). [3] Resin composition for a sealing material according to claim 2, wherein the styrene elastomer (D) comprises at least one selected from the group consisting of a styrene-ethylene / butylene block copolymer (SEB), a styrene-ethylene / butylene-styrene block copolymer (SEBS) and a styrene-ethylene / propylene-styrene block copolymer (SEPS). [4] Resin composition for a sealing material according to claim 2 or claim 3, wherein the content of the styrene elastomer (D) is from 1 wt% to 15 wt% in relation to a total mass of the resin composition for a sealing material. [5] Resin composition for a sealing material according to any one of claims 1 to 4, wherein the 4-methyl-1-pentene / propylene copolymer (C) has a melting point of less than 110 °C or has no melting point. [6] Resin composition for a sealing material according to any one of claims 1 to 5, wherein the ethylene / vinyl ester copolymer (A) is an ethylene / vinyl acetate copolymer. [7] Resin composition for a sealing material according to any one of claims 1 to 6, wherein the ethylene / vinyl ester copolymer (A) has a content of vinyl acetate-derived structural units of 1 wt% to 30 wt%. [8] Resin composition for a sealing material according to any one of claims 1 to 7, wherein the resin composition for a sealing material has a melt mass flow rate (JIS K 7210-1999, 190 °C, 2160 g loading) of 1 g / 10 min to 100 g / 10 min. [9] Use of the resin composition according to any one of claims 1 to 8 for the manufacture of a sealing material, a multilayer body, a packaging material or a packaging container. [10] Use according to claim 9, wherein the multilayer body comprises a carrier material and a sealing layer, the sealing layer comprising the resin composition according to any one of claims 1 to 8. [11] Use according to claim 9, wherein the packaging material comprises the multilayer body. [12] Use according to claim 9, wherein the packaging material is a lid material. [13] Use according to claim 9, wherein the packaging container comprises a container main part with an opening and a lid that closes the opening, the lid comprising the resin composition according to any one of claims 1 to 8. [14] Use according to claim 13, wherein the main part of the container comprises an amorphous polyester.