TWI760183B - Adhesive resin composition and sheet, lid material, sealing container member set and container using the composition - Google Patents

Abstract

The present invention provides an adhesive resin composition, a sheet, a lid, a member group for a sealed container, and a container, wherein the adhesive resin composition is excellent not only in film-forming properties, but also in easy-opening properties relative to polyester-based resin containers, and further Knock peeling is suppressed, and it has a favorable peeling feeling, and it is most suitable for the cover material for polyester resin containers. The above problem is solved by an adhesive resin composition containing 10% by mass to 45% by mass of an ethylene-α olefin copolymer, having a density of 0.80 g/cm ³ to 0.95 g/cm ³ and The melt flow rate is 20 g/10 min to 40 g/10 min; 35 mass % to 65 mass % of ethylene-vinyl acetate copolymer, vinyl acetate content rate of 5 mass % to 15 mass % and melt flow The rate is 1 g/10 min to 10 g/10 min; and 10 mass % to 30 mass % of the tack imparting resin.

Description

Adhesive resin composition, sheet using the composition, lid material, member group for sealed container, and container

The present invention relates to an adhesive resin composition, a sheet using the adhesive resin composition, a lid material, a member group for a sealed container, and a container.

Conventionally, easy-opening properties have been required for lids of plastic containers such as ice cream, yogurt, and jelly. As an adhesive resin composition for lids having excellent sealing properties and easy-opening properties, for example, an ethylene-vinyl acetate-containing adhesive resin composition is known. A copolymer or/and an ethylene-alpha olefin copolymer, and an adhesive resin composition for an adhesion imparting resin. Furthermore, as containers excellent in cold resistance, transparency, water resistance, fragrance retention, etc., there are polyester-based resins, especially containers containing polyethylene terephthalate (hereinafter referred to as PET (polyethylene terephthalate))-based resins utilization is increasing.

As an adhesive resin composition in a plastic container lid material, for example, Japanese Patent Laid-Open No. 10-147672 discloses a composition containing a melt flow rate (hereinafter referred to as MFR (melt flow rate)) of less than 5 The ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer, and adhesion imparting resin are excellent in heat-sealability for various materials, and can be used as an easy-opening sealing material with little adhesion.

[Problems to be Solved by Invention] However, when the sealing material described in Japanese Patent Laid-Open No. 10-147672 is applied to a polyester-based resin container, there is a problem of knocking peeling accompanied by a feeling of resistance at the time of opening.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an adhesive resin composition, a sheet material, a lid material, a member group for a sealed container, and a container using the composition, the adhesive resin composition Not only is it excellent in film-forming properties, but it is also excellent in easy-opening properties compared to polyester-based resin containers, and furthermore, knocking peeling is suppressed and a good peeling feeling is obtained, which is most suitable for a lid material for polyester-based resin containers.

[MEANS TO SOLVE THE PROBLEM] The present invention can provide a sheet including a film laminated with an adhesive resin composition containing: 10% by mass to 45% by mass of an ethylene-α olefin copolymer (A ), the density is 0.80 g/cm ³ to 0.95 g/cm ³ , and the MFR is 20 g/10 minutes to 40 g/10 minutes; 35% to 65% by mass of ethylene-vinyl acetate copolymer (B), The vinyl acetate content rate is 5 mass % - 15 mass %, and MFR is 1 g/10 min - 10 g/10 min; and 10 mass % - 30 mass % adhesion-imparting resin (C). That is, the present invention relates to the inventions of the following [1] to [10].

[1] An adhesive resin composition comprising: 10% by mass to 45% by mass of an ethylene-α-olefin copolymer (A), a density of 0.80 g/cm ³ to 0.95 g/cm ³ , and a melt flow rate of 20 g/10 min to 40 g/10 min; 35 mass % to 65 mass % of ethylene-vinyl acetate copolymer (B), vinyl acetate content rate of 5 mass % to 15 mass %, and melt flow rate It is 1 g/10 minutes - 10 g/10 minutes; and 10 mass % - 30 mass % of tack-imparting resin (C).

[2] The adhesive resin composition according to the above [1], wherein the melt flow rate is 10 g/10 minutes to 30 g/10 minutes.

[3] The adhesive resin composition according to the above [1] or [2], wherein the melting point of the ethylene-α olefin copolymer (A) measured by a differential scanning calorimeter is 75° C. to 90° C. °C.

[4] The adhesive resin composition according to any one of the above [1] to [3], wherein the melting point of the ethylene-vinyl acetate copolymer (B) measured by a differential scanning calorimeter It is 90℃～110℃.

[5] The adhesive resin composition according to any one of the above [1] to [4], wherein the content of the ethylene-α-olefin copolymer (A) is 20% by mass to 45% by mass.

[6] The adhesive resin composition according to any one of the above [1] to [5], wherein the adhesion-imparting resin (C) contains a resin selected from the group consisting of alicyclic hydrocarbon resins and terpene resins at least one of the groups.

[7] A sheet obtained by laminating the film of the adhesive resin composition according to any one of the above [1] to [6] on a base material.

[8] A cover material formed of the sheet according to the above [7].

[9] A member group for a sealed container, comprising: a polyester-based resin container body or a container body whose inner surface is covered with a polyester-based resin; and the lid material according to [8], wherein the sealed container Unpacking can be done with a component set.

[10] A container, wherein an opening of a polyester-based resin container body or a container body whose inner surface is covered with a polyester-based resin is sealed by the lid material described in [8], and the container can be unsealed .

[Effect of invention] According to the present invention, it is possible to provide an adhesive resin composition, which is not only excellent in film-forming properties, but also relatively The polyester-based resin container is excellent in easy-opening properties, and furthermore, knocking peeling is suppressed and a good peeling feeling is obtained, and is most suitable for a lid material for a polyester-based resin container.

The adhesive resin composition of the present invention contains 10% by mass to 45% by mass of the ethylene-α olefin copolymer (A), has a density of 0.80 g/cm ³ to 0.95 g/cm ³ , and has a melt flow rate of 20 g /10 min to 40 g/10 min; 35 to 65 mass % of ethylene-vinyl acetate copolymer (B), vinyl acetate content of 5 to 15 mass %, and a melt flow rate of 1 g/10 minutes to 10 g/10 minutes; and 10 to 30 mass % of the tack-imparting resin (C). Hereinafter, the present invention will be described in detail.

<Ethylene-α-olefin copolymer (A)> The ethylene-α-olefin copolymer (A) used in the present invention has a density of 0.80 g/cm ³ to 0.95 g/cm ³ and a melt flow rate of 20 g/10 minutes The ethylene-α-olefin copolymer of -40 g/10 minutes can be used without particular limitation as long as it satisfies the above-mentioned ethylene-α-olefin copolymer. By using such an ethylene-alpha olefin copolymer, it becomes excellent in adhesiveness with respect to a polyester-type resin container. Such an ethylene-α-olefin copolymer (A) may be used alone or in combination of two or more. In addition, the density in this specification means the value measured by the hydrometer (pycnometer) method in Japanese Industrial Standards (JIS) K7112. In addition, the so-called melt flow rate in this specification refers to a value at 190° C. and 21.168 N measured in accordance with JIS.K7210, and the melt flow rate of the ethylene-α-olefin copolymer (A) is preferably 25 g/10 minutes. ~35 g/10 minutes.

As an alpha olefin which can be copolymerized with ethylene, an alpha olefin having 3 to 20 carbon atoms is preferable, and examples thereof include 1-butene, 1-pentene, 1-hexene, and 1-octene. Among these α-olefins, 1-butene or 1-octene is preferable, and 1-octene is more preferable.

The content of the ethylene-α-olefin copolymer (A) is 10% by mass to 45% by mass, preferably 20% by mass to 45% by mass, based on the adhesive resin composition. When the ethylene-α-olefin copolymer (A) is 10% by mass or more, it can be sufficiently bonded to a polyester-based resin container. From the viewpoint of film formability, the content of the ethylene-α-olefin copolymer (A) is more preferably 30% by mass to 45% by mass, and from the viewpoint of film formability, ease of opening, and peeling feeling, it is still more preferable It is 35 mass % - 40 mass %.

The melting point of the ethylene-α-olefin copolymer (A) measured by a differential scanning calorimeter (hereinafter referred to as a DSC (differential scanning calorimetry) melting point) is preferably 75°C to 90°C, more preferably 75°C to 85°C . It is preferable from the point which can improve the adhesiveness with respect to a polyester-type resin container within the said range.

<Ethylene-vinyl acetate copolymer (B)> In the present invention, the vinyl acetate content of the ethylene-vinyl acetate copolymer (B) is 5% by mass to 15% by mass and the melt flow rate is 1 g/10 min to 10 g/10 min, if the above is satisfied The ethylene-vinyl acetate copolymer can be used without any particular limitation. By using such an ethylene-vinyl acetate copolymer (B), the film-forming property is excellent, and the easy-opening property is excellent with respect to the polyester-based resin container. Such an ethylene-vinyl acetate copolymer (B) may be used individually by 1 type, and may use 2 or more types together.

The content of the ethylene-vinyl acetate copolymer (B) is 35% by mass to 65% by mass, preferably 40% by mass to 60% by mass, based on the adhesive resin composition. When the ethylene-vinyl acetate copolymer (B) is 35% by mass or more, it will be sufficiently bonded to a polyester-based resin container without impairing the opening strength. In addition, when it is 65 mass % or less, not only is the balance between coating processability and adhesiveness excellent, but resin residue and threading do not occur in the flange of the container. From the viewpoint of film formability, the content of the ethylene-vinyl acetate copolymer (B) is more preferably from 40% by mass to 55% by mass, and from the viewpoint of film formability, ease of opening, and peeling feeling, it is even more preferable. Preferably it is 40 mass % - 45 mass %.

In addition, the DSC melting point of the ethylene-vinyl acetate copolymer (B) is preferably 85°C to 110°C, more preferably 90°C to 100°C. Within this range, the compatibility with the ethylene-α-olefin copolymer (A) is improved, and not only the coating processability is improved, but also sufficient adhesion can be achieved without impairing the unsealing strength, which is preferable in this respect. .

<Adhesion imparting resin (C)> The tack imparting resin (C) in the present invention is not particularly limited, and can be appropriately selected from known tack imparting resins in the field of sealant resins, and may be used alone or in combination of two or more. Examples of such adhesion-imparting resin (C) include aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, aromatic hydrocarbon resins, polyterpene resins (terpene resins), and rosins. As the terpene resin, a homopolymer or a copolymer of α-pinene, β-pinene, or the like, and a hydrogenated terpene resin obtained by hydrogenating these can be used. Among them, the adhesion-imparting resin (C) preferably contains at least one selected from the group consisting of alicyclic hydrocarbon resins, aromatic hydrocarbon resins and terpene resins, and more preferably contains at least one selected from the group consisting of alicyclic hydrocarbon resins and terpene resins At least one of the group consisting of olefin resins.

The content of the tackifying resin (C) is in the range of 10 to 30 mass %, preferably in the range of 15 to 25 mass %, based on the adhesive resin composition. When the adhesion-imparting resin (C) is 10% by mass or more, it can be sufficiently bonded to a polyester-based resin container without impairing the opening strength. In addition, when it is 30 mass % or less, film-forming property becomes favorable. The content of the tackifying resin (C) is more preferably 15% by mass to 20% by mass from the viewpoint of film-forming property, easy-opening property, and peeling feeling.

The softening point of the tackifying resin (C) is preferably 120° C. or lower from the viewpoint of the adhesiveness at the time of heat sealing, that is, the ease of opening. In addition, the so-called softening point in this specification can be calculated|required based on JIS.K6863. Moreover, 50 degreeC - 95 degreeC are preferable, and, as for the DSC melting point of the adhesion-imparting resin (C), it is more preferable that it is 50 degreeC - 70 degreeC.

<Adhesive resin composition> The adhesive resin composition of the present invention can be produced by mixing the ethylene-α-olefin copolymer (A), the ethylene-vinyl acetate copolymer (B), and the adhesion-imparting resin (C) by a known method. Such a production method includes, for example, a method in which each component is put into a mixing device such as a Henschel mixer or a tumbler mixer, and mixed for a blending time of 5 minutes to 20 minutes. It is then put into an extruder, heated and kneaded, and then extruded. The extrusion step is usually carried out at 150°C to 200°C. The extrudate is typically formed into pellet shape for use in subsequent steps. As the extruder, a twin-screw extruder can be suitably used, but is not limited thereto. The total amount of the ethylene-α-olefin copolymer (A), the ethylene-vinyl acetate copolymer (B), and the tack-imparting resin (C) in the adhesive resin composition of the present invention is based on the adhesive resin composition. Preferably it is 95 mass % or more, More preferably, it is 98 mass % or more.

The melt flow rate of the adhesive resin composition is preferably in the range of 10 g/10 minutes to 30 g/10 minutes, and more preferably in the range of 15 g/10 minutes to 25 g/10 minutes. If it is the said range, adhesiveness is excellent with respect to the polyester-type resin container, and it is preferable in this respect.

In the adhesive resin composition of the present invention, the ethylene-α olefin copolymer (A), the ethylene-vinyl acetate copolymer (B), and the adhesion-imparting resin (C) can be formulated within a range that does not impair the effects of the present invention. ) other than resins and additives.

Examples of resins that may be further contained include polyolefin resins such as high-density polyethylene and polypropylene, oxides of the polyolefin resins, or maleic acid-modified products of the polyolefin resins; ethylene- Acrylic acid copolymers, ethylene-unsaturated monocarboxylic acid copolymers such as ethylene-(meth)acrylic acid copolymers and their metal salts; high density polyethylene wax, polypropylene wax, Fischer-Tropsch wax , paraffin, oxidized wax, maleic acid modified wax and other waxes. Such resins may be used alone or in combination of two or more.

Additives which may be further contained can be used for the purpose of preventing thermal deterioration, thermal decomposition, blocking, etc., and ensuring appropriate processing such as film processing, extrusion lamination processing, and the like. Examples of such additives include organic lubricants such as sinapic acid amide, inorganic lubricants such as calcium carbonate, antioxidants such as hindered phenols, antiblocking agents, antistatic agents, fillers, antifogging agents, amorphous Quality aluminosilicate, silica.

The resins and additives can be formulated when mixing the ethylene-α-olefin copolymer (A), ethylene-vinyl acetate copolymer (B), and adhesion-imparting resin (C), or can be pre-formulated to the ethylene-α-olefin copolymer (A), any of ethylene-vinyl acetate copolymer (B), or adhesion-imparting resin (C).

＜Sheet＞ Next, a sheet in which the coating film of the adhesive resin composition of the present invention (hereinafter also referred to as an adhesive layer) of the adhesive resin composition of the present invention is laminated on a base material will be described. The method of laminating the adhesive resin composition on the substrate is not particularly limited. For example, the adhesive resin composition pelletized as described above is formed into a film by a blow molding method, a casting method, or the like, and the obtained film is laminated with a base material; or a mixed A method in which the smelted adhesive resin composition is directly coated on a substrate. About the lamination|stacking of a film and a base material, you may laminate|stack via another adhesive agent layer. As the base material, there are long and cut short films and sheets, and other than stretched films such as polyester films, polyamide films, and polypropylene films, or single-layer films such as unstretched films In addition, a laminate having a plurality of layers such as resin lamination may be used. For example, in the case of using a base material laminated with a polyethylene-based resin in advance, the adhesive resin composition can be directly extruded and laminated to produce a sheet. In addition, a multi-layer film can be made by co-extruding the adhesive resin composition with polyethylene or polypropylene, and laminated with the base film by dry lamination or sandwich lamination. , thereby obtaining a sheet.

In order to improve the adhesiveness between the substrate and the film of the adhesive resin composition, the surface of the substrate may be treated with flame treatment, ozone treatment, corona discharge treatment, or intermediate coating agent. In addition, the thickness of the film of the adhesive resin composition of the present invention is preferably 5 μm or more, and more preferably 10 μm or more.

The sheet of the present invention can be suitably used not only as a cover material to be described later, but also as a sealing film for a bag-making product sealed with a film of an adhesive resin composition as an inner surface.

＜Cover material＞ The sheet|seat of this invention which laminated|stacked the film of an adhesive resin composition on a base material can be suitably used as a cover material by cutting out the shape of the opening of the container main body which is a sealing object. When using the sheet|seat of this invention as a cover material, various base materials can be used as a base material. As a base material to be used, for example, paper, aluminum, polyester, polyethylene, polypropylene, polystyrene, aluminum-deposited polyester, aluminum-deposited polypropylene, or silica-deposited polyester can be mentioned. Such a base material does not have to be a single layer, and may be a laminate of two or more layers. In addition, when the cover material is formed from the sheet of the present invention, as the base material, for example, a laminate of PET of 5 μm to 20 μm and polyethylene of 5 μm to 30 μm is preferable, and the laminate is preferably The polyethylene surface layer of the present invention is a film with a thickness of 5 μm to 40 μm formed from the adhesive resin composition of the present invention. When the lid material of the present invention is used, examples of the material to be sealed include containers and sheets using polyester-based resins such as polystyrene, polypropylene, and polyethylene terephthalate. . Among them, polyester-based resins are preferred in terms of being excellent in cold resistance, transparency, water resistance, fragrance retention, and the like, and the adhesive resin composition of the present invention exhibits excellent adhesive strength with respect to polyester-based resins (Easy-opening property) and peeling feeling, it can be used appropriately.

<Component set for airtight container> The member group for airtight containers of the present invention includes a polyester-based resin container body or a container body whose inner surface is covered with a polyester-based resin, and an unsealable lid material of the present invention.

＜Container＞ The container of this invention is the container main body made of polyester resin or the opening part of the container main body whose inner surface is covered with polyester resin is sealed by the cover material of this invention. The lid material is configured to be able to unseal the container.

[Example] Hereinafter, the present invention will be described based on Examples, but the present invention is not limited thereto. In addition, in an Example, "part" and "%" represent "mass part" and "mass %", respectively.

[Melt Flow Rate (MFR)] Regarding MFR, in accordance with JIS.K7210, a melt indexer L244 (manufactured by Takara Industrial Co., Ltd.) was filled with a sample having an inner diameter of 9.55 mm and a length of 162 mm, and the sample was melted at 190° C., using a weight of 2160 g. A plunger with a diameter of 9.48 mm is equally loaded, and it is obtained from the amount of resin extruded per unit time (g/10 minutes) from an orifice with a diameter of 2.1 mm provided in the center of the barrel.

<Manufacturing method of adhesive resin composition> [Example 1 to Example 8 and Comparative Example 1 to Comparative Example 6] (Manufacture of Adhesive Resin Composition (S-1) to Adhesive Resin Composition (S-14)) The ethylene-α-olefin copolymer (A), ethylene-vinyl acetate copolymer (B), tack-imparting resin (C), and additives described in Table 1 were pre-blended for 5 minutes using a Henschel mixer. The pre-blend was put into a hopper, and was supplied to the following extruder using a screw feeder, and the pellet-shaped adhesive resin composition (S-1) - adhesive resin composition (S-14) were manufactured. "Extruder Conditions" Extruder: Co-rotating twin-screw extruder PMT32-40.5 manufactured by IKG Cylinder temperature: 160°C (supply port 150°C) Screw rotation speed: 200 rpm Feeding rate: 10 kg/hr

<Evaluation of Adhesive Resin Composition> The following film-forming properties were evaluated for the obtained adhesive resin composition. Moreover, the following laminated|stacked sheet (cover material) was produced, and the following adhesive strength (easy-opening property) and the presence or absence of knock peeling were evaluated using the said sheet. The results are shown in Table 1. In addition, the MFR of the adhesive resin composition is shown in Table 1.

[film-forming properties] The film-forming property of the adhesive resin composition depends on whether or not it can be applied when the resin temperature is adjusted to any one of 200°C to 260°C under the following processing conditions so that the thickness of the adhesive layer is 20 μm , and the film thickness at 10 locations randomly selected from the obtained coating material using a film thickness meter, and evaluated according to the following criteria. "Processing conditions" Extrusion laminator: 400M/M test EXT laminator made by Musashino Kikai Resin temperature just below the die: 200℃～260℃ Processing speed: 30 m/min T-die width: 400 mm Cooling roll surface temperature: 20℃ Substrate: Coated on the PE side of PET 12 μm/polyethylene (PE) 25 μm substrate A: Coating is possible, and the thickness of the adhesive layer is within the range of 20±3 μm; good B: Can be applied, and the thickness of the adhesive layer is in the range of 20±6 μm; can be used C: Either film breakage or film breakage occurred and coating was impossible, or coating was possible but the thickness of the adhesive layer exceeded 20±6 μm; poor

[Production method of sheet (covering material)] Using an extrusion laminator, the obtained adhesive resin composition was laminated on the PE surface of a PET 12 μm/PE 25 μm base material to prepare a sheet. The thickness of the adhesive layer was 20 μm. Processing conditions are shown below. Extrusion laminator: 400M/M test EXT laminator made by Musashino Kikai Resin temperature just below the die: 200°C to 250°C (appropriately adjusted according to the MFR of the adhesive resin composition, etc.) Processing speed: 30 m/min T-die width: 400 mm Cooling roll surface temperature: 20℃

[Easy to open] The obtained laminated sheet (cover material) was cut into a size of 90 mm×90 mm, and then the film surface of the adhesive resin composition was thermally bonded to a 71Φ PET container at a gauge pressure of 0.3 MPa, 150° C., for 1 second, and sealed. It was placed in a constant temperature and humidity chamber with a temperature of 23° C. and a humidity of 65% for 24 hours. In this constant temperature and humidity chamber, the peel strength was measured under the conditions of peeling at an angle of 90° and a tensile speed of 200 mm/min. The maximum value of the peel strength was taken as the opening strength, and the easy-opening property was evaluated according to the following criteria. A: The maximum value of peel strength is 10 N or more and less than 15 N; good B: The maximum value of the peel strength is 5 N or more and less than 10 N; it can be used C: The maximum value of peel strength is less than 5 N; poor

[Presence or absence of knock peeling] With regard to the peeling sound in the measurement of the peeling strength, sensory evaluation was performed according to the following criteria. A: No knock C: There is knocking

[Table 1] Table 1 Example Wei Comparative example 1 2 3 4 5 6 7 8 1 2 3 4 5 6 S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 S-10 S-11 S-12 S-13 S-14 Ethylene-alpha olefin copolymer (A) A1 35 15 20 33 39 33 30 10 5 10 85 A2 40 A3 10 39 Ethylene-vinyl acetate copolymer (B) B1 50 55 43.5 47 55 70 55 43.5 B2 47 70 80 B3 60 40 Adhesion imparting resin (C) C1 15 30 20 20 17.5 15 20 20 15 35 15 17.5 C2 18 C3 2 C4 20 additive Anti-blocking agent 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Antioxidants 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 silica 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 MFR (g/10min) 12 25 15 26 twenty two 19 20 20 9 12 9 30 4 5 film-forming A B A A A A A A A A A C C B Easy to open A A A B A A A B C C C A B C Whether knock stripping is present or not A A A A A A A A A A A A C C

Abbreviations in Table 1 are shown below. A1: ENGAGE 8401 (manufactured by DOW, ethylene-1-octene copolymer, density 0.885 g/cm ³ , DSC melting point 80°C, MFR 30 g/10 minutes) A2: ENGAGE (ENGAGE) 8402 (manufactured by Dow (DOW), ethylene-1-octene copolymer, density 0.900 g/cm ³ , DSC melting point 96°C, MFR 30 g/10 minutes) A3: ENGAGE (ENGAGE) 8440 ( Dow (DOW) company, ethylene-1-octene copolymer, density 0.900 g/cm ³ , DSC melting point 93 ℃, MFR 1.6 g/10 minutes)

B1: Ultrathene 515 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer (vinyl acetate content 6%), density 0.925 g/cm ³ , DSC melting point 99°C, MFR 2.5 g/10 min) B2: Ultrathene 540 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer (vinyl acetate content: 10%), density 0.929 g/cm ³ , DSC melting point 94°C, MFR 3.0 g /10 minutes) B3: Ultrathene 537 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer (vinyl acetate content 6%), density 0.925 g/cm ³ , DSC melting point 98°C, MFR 8. 5 g/10 minutes)

C1: ARKON M-115 (manufactured by Arakawa Chemical Industry Co., Ltd., partially hydrogenated alicyclic hydrocarbon resin, softening point 115°C, DSC melting point 69°C) C2: ARKON M-100 (manufactured by Arakawa Chemical Industry Co., Ltd., fully hydrogenated alicyclic hydrocarbon resin, softening point 115°C, DSC melting point 56°C) C3: SYLVARES TRM1115 (manufactured by KRATON, terpene resin, softening point 115°C, DSC melting point 79°C) C4: SYLVARES TP2019 (manufactured by KRATON, terpene resin, softening point 124°C, DSC melting point 85°C)

Anti-blocking agent: Incross lip C (manufactured by Croda, sinapic acid amide, DSC melting point 80°C) Antioxidant: IRGANOX 1010 (manufactured by BASF, hindered phenolic antioxidant) Silica: Silysia 550 (manufactured by Fuji Silysia Chemical, synthetic silica)

From the results in Table 1, the adhesive resin composition of the present invention exhibited excellent film-forming properties, easy-opening properties, and good peeling feeling without knocking. In particular, ethylene-α olefin copolymer (A) 30 to 45 mass %, ethylene-vinyl acetate copolymer (B) 40 to 55 mass %, and tackifier resin (C) 10 to 30 mass % %, the film-forming property is excellent. In addition, if the ethylene-α olefin copolymer (A) is 35% by mass to 40% by mass, the ethylene-vinyl acetate copolymer (B) is 40% by mass to 45% by mass, and the tackifier resin (C) is 15% by mass to 20% by mass mass %, the film-forming property is excellent, and the easy-opening property and the peeling feeling are excellent with respect to the PET container. Thus, the adhesive resin composition of the present invention containing the specific resin (A) to resin (C) in a specific ratio is most suitable for use as a lid material for a container containing a polyester-based resin.

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Claims (9)

An adhesive resin composition containing: 10% by mass to 45% by mass of an ethylene-alpha olefin copolymer (A), a density of 0.80 g/cm ³ to 0.95 g/cm ³ , and a melting point measured by a differential scanning calorimeter It is 75 ℃～90 ℃, and the melt flow rate is 20 g/10 minutes～40 g/10 minutes; 35 mass %～65 mass % of ethylene-vinyl acetate copolymer (B), vinyl acetate content rate 5 to 15 mass % and a melt flow rate of 1 to 10 g/10 minutes; and 10 to 30 mass % of the tack-imparting resin (C). The adhesive resin composition according to claim 1, wherein the melt flow rate is 10 g/10 minutes to 30 g/10 minutes. The adhesive resin composition according to claim 1 or claim 2, wherein the ethylene-vinyl acetate copolymer (B) has a melting point of 90°C to 110°C as measured by a differential scanning calorimeter. The adhesive resin composition according to claim 1 or claim 2, wherein the content of the ethylene-α-olefin copolymer (A) is 20% by mass to 45% by mass. The adhesive resin composition according to claim 1 or claim 2, wherein the adhesion-imparting resin (C) contains at least one selected from the group consisting of an alicyclic hydrocarbon resin and a terpene resin. A sheet obtained by laminating a film of the adhesive resin composition according to any one of Claims 1 to 5 on a base material. A cover material formed of the sheet material as claimed in claim 6. A member group for a sealed container, comprising: a polyester-based resin container body or a container body whose inner surface is covered with a polyester-based resin; and the lid material according to claim 7, wherein the sealed container member group is capable of Kaifeng. A container in which an opening of a polyester-based resin container body or a container body whose inner surface is covered with a polyester-based resin is sealed with the lid material according to claim 7, and the container can be unsealed.