JP2023007021A - Adhesive resin composition, laminated sheet using the composition and lid material - Google Patents

Abstract

To provide an adhesive resin composition exhibiting easy openability in opening, a laminated sheet using the composition and a lid material, more specifically, an adhesive resin composition which has easy openability, especially, for polyethylene or a container coating polyethylene without restricting a lamination method by lamination and a substrate material, and prevents stringiness, a laminated sheet using the composition, and a lid material.SOLUTION: An adhesive resin composition contains, in 100 mass% of the total of a polyethylene-based resin (A) having a melt flow rate measured under conditions of 190°C and a load of 2.16 kg of 0.1-10 g/10 min, a polypropylene-based resin (B) having a melt flow rate measured under conditions of 190°C and a load of 2.16 kg of 0.1-10 g/10 min, and a polyethylene wax (C), 35-70 mass% of a polyethylene-based resin (A), 15-40 mass% of a polypropylene-based resin (B) and 8-40 mass% of a polyethylene wax (C).SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to an adhesive resin composition exhibiting easy-openability due to cohesive failure at the time of opening, and a sheet laminated with a film of the adhesive resin composition. More specifically, an adhesive resin composition that is easy to open and does not cause stringing without limiting the lamination method by lamination or the base material, especially for polyethylene or polyethylene-coated containers, and its adhesiveness The present invention relates to a laminated sheet in which a film of a resin composition is laminated.

In the field of food packaging, until now, contents such as cup noodles, yogurt, jelly, etc. have been filled in a paper container coated with polyethylene resin, and an adhesive resin composition with excellent sealability has been applied to the opening of the container. A form of packaging in which a cover material having layers is adhered has been widely used.

In recent years, when opening a paper container coated with a polyethylene resin, the adhesive resin composition layer is mainly of the cohesive failure type in order to impart an easy-to-open function. In the cohesive failure type peeling mechanism, cohesive failure is caused by a blend of non-compatible or partially compatible two-component thermoplastic resins, which is the adhesive resin composition, resulting in a smooth peeling feeling and easy-to-open properties. However, at this time, "stringing", in which the adhesive resin composition remains in the form of threads on the flange of the container, sometimes occurs.

If the adhesion between the base material and the adhesive resin composition of the lid material composed of the substrate / base material / adhesive resin composition is insufficient, a part of the adhesive resin composition will not cohesively fail and the container will be damaged. Stringing occurs when it is pulled to the side and eventually stretches and breaks.

Therefore, a resin composition has been proposed in which an ethylene-α-olefin copolymer as a compatibilizer is added to an incompatible or partially compatible two-component thermoplastic resin (see Patent Document 1).

Also, an easily peelable adhesive for polyethylene has been proposed, which comprises a polyethylene resin, a crystalline polypropylene resin, and a low-molecular-weight polyethylene wax (see Patent Document 2).

In addition to incompatible low-density polyethylene and polybutene, sealant adhesives composed of ethylene copolymers such as ethylene-vinyl acetate copolymers, ethylene-methyl methacrylic copolymers, and ethylene-methacrylic acid copolymers, and waxes. has been proposed (see Patent Document 3).

JP-A-2000-302990 JP 2007-112955 A JP 2016-166304 A

The main technique for laminating the adhesive resin composition to produce a laminate of substrate/backing material/adhesive resin composition is the lamination method, which can be broadly classified into three techniques. Extrusion lamination in which a molten adhesive resin composition is laminated on a base material/backing material, co-extrusion lamination in which two layers of a molten adhesive resin composition and a base material are simultaneously laminated on a base material, and a base material for a base material/backing material dry lamination, in which a melted adhesive resin composition is laminated after applying a solvent-type adhesive to the substrate.
Since two layers are simultaneously extruded in the co-extrusion laminate, it is necessary to select and study a base material suitable for the properties of the adhesive resin composition. In addition, since the dry lamination involves removing the solvent from the solvent-based adhesive, there is a problem such as a decrease in workability due to the drying process. In that respect, extrusion lamination can solve these problems.
On the other hand, in co-extrusion lamination, since the base material and the adhesive resin composition are melted and laminated at the same time, the adhesive resin composition and the base material are integrated and stringing can be suppressed. In dry lamination, since the base material and the adhesive resin composition are bonded together with an adhesive, they are sufficiently adhered to each other and stringing can be suppressed. On the other hand, in extrusion lamination, since a melted adhesive resin composition is laminated on a base material, there is a problem that sufficient adhesion is not achieved depending on the composition of the adhesive resin composition and the type of the base material.
In particular, extrusion laminates may not adhere well to polyethylene (hereinafter also referred to as PE) substrates. This is caused by the effects of the high melting point and crystallinity, which are the characteristics of polyethylene, and as an improvement measure, ethylene-vinyl acetate copolymer (hereinafter referred to as EVA), ethylene-(meth)acrylic acid copolymer, ethylene-maleic acid copolymer, and other ethylene-acid-modified copolymers may be used as the base material.
The resin composition proposed in Patent Document 1 exhibits good stringiness when produced by co-extrusion lamination, but stringiness occurs when produced by extrusion lamination.
The easily peelable adhesive for polyethylene proposed in Patent Document 2 improves stringiness by lamination by extrusion lamination. It is laminated with a peelable adhesive and does not adhere when laminated to a polyethylene layer of PET/PE.
The sealant adhesive proposed in Patent Document 3 uses an ethylene copolymer such as an acid-containing ethylene-vinyl acetate copolymer, ethylene-methyl methacrylic copolymer, or ethylene-methacrylic acid copolymer. , there are concerns about new problems such as problems in food applications with severe odors, and generation of gel matter when laminating by extrusion lamination.
In view of the above, there has been no adhesive resin composition that is highly safe for food and that is free from restrictions on lamination methods and base materials.

The problem to be solved by the present invention relates to an adhesive resin composition exhibiting easy-openability when unsealed, and a laminated sheet in which a film of the adhesive resin composition is laminated. More specifically, an adhesive resin composition that is easy to open and does not cause stringing without limiting the lamination method by lamination or the base material, especially for polyethylene or polyethylene-coated containers, and its adhesiveness An object of the present invention is to provide a laminated sheet in which a film of a resin composition is laminated.

As a result of intensive studies by the present inventors in order to solve the above problems, a polyethylene resin having a melt flow rate of 0.1 to 10 g / 10 minutes measured under conditions of 190 ° C. and a load of 2.16 kg (A), a polypropylene resin (B) having a melt flow rate of 0.1 to 10 g/10 min measured under a load of 2.16 kg at 230°C, and a polyethylene wax (C) in a total of 100% by mass, The adhesive resin composition is characterized by containing 35 to 70% by mass of polyethylene resin (A), 15 to 40% by mass of polypropylene resin (B), and 8 to 40% by mass of polyethylene wax (C). Found a solution to the problem.
Conventionally, the polyethylene wax (C) softens the polyethylene resin and reduces the cohesive force, thereby improving stringiness. By imparting wettability to the adhesive resin composition and adhering to the adhesive resin composition, the stringing can be further improved by sufficiently adhering the base material and the adhesive resin composition.
On the other hand, the inclusion of the polyethylene wax (C) greatly reduces the coatability of the extrusion laminate, so the melt flow rate of the polyethylene resin (A) measured at 190 ° C. under a load of 2.16 kg and the melt flow rate of the polyethylene resin (A) at 230 ° C. , the problem of coatability can be solved by limiting the melt flow rate of the polypropylene resin (B) measured under a load of 2.16 kg to 0.1 to 10 g/10 minutes.
As described above, it is possible to provide an adhesive resin composition that is easy to open and does not cause stringing without limiting the lamination method by lamination or the base material.

That is, the present invention relates to the following inventions [1] to [5].

[1] A polyethylene resin (A) having a melt flow rate of 0.1 to 10 g/10 min measured under conditions of 190°C and a load of 2.16 kg, and a melt flow measured under conditions of 230°C and a load of 2.16 kg. Polypropylene resin (B) having a rate of 0.1 to 10 g/10 min and polyethylene wax (C) total 100% by mass, polyethylene resin (A) 35 to 70% by mass, polypropylene resin (B) 15 to 40% by mass, and 8 to 40% by mass of polyethylene wax (C).

[2] The content ratio of the polyethylene resin (A) and the polypropylene resin (B) is (A)>(B), and the content ratio of the polyethylene resin (A) and the polyethylene wax (C) is (A)> It relates to the adhesive resin composition, which is (C).

[3] The adhesive resin composition has a melt flow rate of 5 to 45 g/10 minutes measured at 190° C. under a load of 2.16 kg.

[4] A laminated sheet in which a coating film of the adhesive resin composition is laminated on a base sheet.

[5] The present invention relates to a lid member formed from the laminated sheet.

With the adhesive resin composition of the present invention, an adhesive resin composition that is easy to open and does not cause stringing without limiting the lamination method by lamination or the base material for a polyethylene-coated container, and its adhesiveness It is possible to obtain a container relating to the laminated sheet in which the coating of the resin composition is laminated.

The adhesive resin composition of the present invention comprises 35 to 70 masses of polyethylene resin (A) having a melt flow rate (MFR) of 0.1 to 10 g/10 minutes measured under conditions of 190°C and a load of 2.16 kg. %, 15 to 40% by mass of a polypropylene resin (B) having an MFR of 0.1 to 10 g/10 minutes measured under conditions of 230° C. and a load of 2.16 kg, and 8 to 40% by mass of polyethylene wax (C), contains
The adhesive resin composition of the present invention, the laminated sheet obtained by laminating the same, the container lid material produced from the laminated sheet, and the container sealed with the lid material are described below in more detail.

<Polyethylene resin (A)>
The MFR of the polyethylene resin (A) measured at 190° C. under a load of 2.16 kg is 0.1 to 10 g/10 minutes, preferably 0.5 to 8 g/10 minutes. When it is within the above range, it is preferable in that coating by extrusion lamination can be stabilized.

The polyethylene-based resin (A) may be an ethylene homopolymer or a copolymer of ethylene and olefin. Specifically, a homopolymer such as low-density polyethylene or high-density polyethylene, or propylene, butene, pentene, hexene, or carbon number 7 in an arbitrary ratio as long as it can maintain an incompatible system or a partially compatible system. A copolymer obtained by polymerizing at least one selected from the group consisting of the above olefins having long carbon chains and ethylene can be used. Among them, low-density polyethylene is preferable from the aspect of extrusion lamination processability, and low-density polyethylene produced by a high-pressure method is particularly preferable.

The polyethylene resin (A) is 35 to 70% by mass, preferably 40 to 65% by mass, in the total 100% by mass of the polyethylene resin (A), polypropylene resin (B), and polyethylene wax (C). and more preferably 45 to 60% by mass. When the polyethylene-based resin (A) is 35% by mass or more, coating by extrusion lamination can be stabilized. Further, when the content is 70% by mass or less, sufficient adhesion can be achieved without impairing easy-openability due to cohesive failure.

<Polypropylene resin (B)>
The MFR of the polypropylene resin (B) measured at 230° C. under a load of 2.16 kg is 0.1 to 10 g/10 minutes, preferably 0.5 to 8 g/10 minutes. When it is within the above range, it is preferable in that coating by extrusion lamination can be stabilized.

The polypropylene-based resin (B) may be a propylene homopolymer or a copolymer of propylene and an olefin. Specifically, propylene homopolymerization, or ethylene, butene, pentene, hexene, or olefins with a long carbon chain of 7 or more carbon atoms at any ratio, as long as an incompatible system or a partially compatible system can be maintained. A copolymer obtained by polymerizing at least one selected from the group consisting of propylene and propylene can be used. Among them, a polypropylene-ethylene copolymer is preferable because of its coatability by extrusion lamination.
In this specification, copolymers of ethylene and propylene are classified as polyethylene-based resins (A) when the DSC melting point is 130°C or less, and as polypropylene-based resins (B) when the DSC melting point exceeds 130°C.

The polypropylene resin (B) is 15 to 40% by mass, more preferably 18 to 35% by mass, in the total 100% by mass of the polyethylene resin (A), polypropylene resin (B), and polyethylene wax (C). %, particularly preferably 20 to 30% by mass. When it is within the above range, it is preferable from the viewpoint of easy opening.

<Polyethylene wax (C)>
Polyethylene wax (C) can provide sufficient lamination strength especially to polyethylene as the base material, and can further improve stringiness.
The polyethylene wax (C) may be ethylene homopolymer or copolymer. Specifically, polyethylene, polyethylene oxide, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, as long as it is compatible with the polyethylene resin (A) and can impart wettability to the base material. Polymers, ethylene oxide-vinyl acetate copolymers, ethylene-maleic anhydride copolymers can be used. Among them, polyethylene homopolymerization is preferable from the aspect of odor. However, the polyethylene wax (C) does not contain the polyethylene resin (A).
The polyethylene wax (C) in the present invention is 8 to 40% by mass, more preferably 12 to 100% by mass, based on the total 100% by mass of the polyethylene resin (A), the polypropylene resin (B), and the polyethylene wax (C). It is preferably 30% by mass, particularly preferably 15 to 25% by mass. When it is within the above range, it is preferable in that it adheres to the base material polyethylene and improves stringiness.

The viscosity of the polyethylene wax (C) at 140° C. is preferably 50 to 10,000 mPa·s, more preferably 60 to 8,000 mPa·s. When it is within the above range, it is preferable in terms of sufficiently adhering to the polyethylene base material. The viscosity is a value measured using a Brookfield viscometer (measurement conditions: 140° C., rotor No. 3, 12 rpm, 30 seconds). Details are described in the section of Examples.

The melting point of the polyethylene wax (C) is preferably 90-145°C, more preferably 95-130°C. When it is within the above range, it is preferable in terms of sufficiently adhering to the polyethylene base material. In addition, the melting point in the present invention is a temperature measured by a differential scanning calorimeter. Details are described in the section of Examples.

<Adhesive resin composition>
The adhesive resin composition of the present invention contains polyethylene resin (A), polypropylene resin (B), and polyethylene wax (C) in total of 100% by mass,
Polyethylene resin (A) 35 to 70% by mass,
It contains 15 to 40% by mass of polypropylene resin (B) and 8 to 40% by mass of polyethylene wax (C).
Furthermore, the content ratio (mass ratio) of the polyethylene resin (A) and the polypropylene resin (B) is (A) > (B) and the content ratio (mass ratio) of the polyethylene resin (A) and the polyethylene wax (C) ratio) is preferably (A)>(C).

The adhesive resin composition of the present invention contains a polyethylene-based resin (A), a polypropylene-based resin (B), and polyethylene within a range that does not contradict the object of the present invention, that is, a range that does not impair easy-openability and stringiness. A resin other than the wax (C) may be blended.

Examples of such resins include, specifically, ethylene or maleic acid-modified products obtained by adding maleic anhydride to at least one selected from the group consisting of olefins having a long carbon chain with 3 or more carbon atoms, and ethylene vinyl acetate. Copolymers, ethylene-unsaturated monocarboxylic acid copolymers such as ethylene-acrylic acid copolymers, ethylene-(meth)acrylic acid copolymers and metal salts thereof, styrene-butadiene copolymer elastomers and hydrogenated products thereof Elastomers, or known tackifying resins such as aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, aromatic hydrocarbon resins, polyterpene resins, rosins, or polypropylene wax, ethylene-vinyl acetate Known waxes such as copolymer wax, Fischer-Tropsch wax, paraffin wax, oxidized wax, maleic acid-modified wax, and polyethylene wax grafted with styrene monomer can be used. Moreover, these resins may be used alone or in combination of two or more.

In the adhesive resin composition of the present invention, in order to prevent thermal deterioration, thermal decomposition, blocking, etc. and to ensure processing suitability such as film processing and extrusion lamination processing, within a range that does not impair the purpose of the present invention. Additives and the like may also be used. Examples of additives include organic lubricants such as erucamide, inorganic lubricants such as calcium carbonate, antioxidants such as hindered phenol, antiblocking agents, antistatic agents, fillers and pigments.

The amount of the additive is 0% by mass or more and less than 15% by mass, preferably 0 or more and 10% by mass with respect to the total 100% by mass of the polyethylene resin (A), the polypropylene resin (B), and the polyethylene wax (C). Less than mass %, more preferably 0 mass % or more and less than 5 mass %. It is preferable that it is within the above range because the easy-openability and stringiness are not impaired.

These additives may be added at the time of blending the polyethylene resin (A), the polypropylene resin (B), and the polyethylene wax (C), or may be added in advance to the polyethylene resin (A), the polypropylene resin (B), and polyethylene wax (C), and then the polyethylene resin (A), polypropylene resin (B), and polyethylene wax (C) kneaded with additives are kneaded with other components. It may be blended by

The blending of the polyethylene resin (A), polypropylene resin (B), polyethylene wax (C), and optional additives is carried out by, for example, putting these components into a mixing device such as a Henschel mixer or a tumbler mixer. After mixing for a blending time of 5 to 20 minutes, the mixture is placed in an extruder, heated and kneaded, and then extruded. The extrudate is usually pelletized for use in subsequent steps. Preferred examples of the extruder include, but are not limited to, a twin-screw extruder. Extrusion is also usually carried out at 140-200°C.

The adhesive resin composition preferably has a melt flow rate of 5 to 45 g/10 minutes, more preferably 8 to 35 g/10 minutes, more preferably 8 to 35 g/10 minutes, measured under conditions of 190° C. and a load of 2.16 kg. 10 to 30 g/10 minutes. The above range is preferable in terms of stable coating by extrusion lamination.

<Laminated sheet>
Next, a laminated sheet in which a film of the adhesive resin composition of the present invention is laminated on a base sheet will be described. The substrate sheet used includes paper, aluminum, polyester, polyethylene, polypropylene, polystyrene, aluminum-deposited polyester, aluminum-deposited polypropylene, silica-deposited polyester, and the like. The base sheet does not have to be a single layer, and may be a laminate of two or more layers. In the present application, it is preferable to use a laminate of PET having a thickness of 5 to 20 μm and polyethylene having a thickness of 5 to 30 μm, for example, as the base sheet. The surface of the laminate that comes into contact with the adhesive resin composition is called a base material.
As a method for laminating the adhesive resin composition of the present invention on a substrate, for example, the resin composition pelletized as described above is used, and a single layer film is formed by an inflation method or a casting method, and this film is used as a substrate. A method of laminating with a sheet (via an adhesive layer if necessary) can be mentioned. Alternatively, the kneaded composition may be directly coated onto the substrate, or other methods may be employed.

In order to improve the adhesion of the laminated surface, the substrate sheet surface may be subjected to flame treatment, ozone treatment, corona discharge treatment, or treatment with an anchor coating agent. It is also possible to perform extrusion lamination directly on a base sheet that has been laminated with a polyethylene-based resin in advance. Alternatively, a laminated film can be obtained by forming a multilayer film by co-extrusion with polyethylene, polypropylene, etc., and laminating it with a stretched or unstretched film such as a polyester film, polyamide film, polypropylene film, etc. by dry lamination or sand lamination. can also Also in this case, in order to improve the adhesion of the laminated surface, if necessary, the base sheet surface may be subjected to flame treatment, ozone treatment, corona discharge treatment, treatment with an anchor coating agent, or the like. . Moreover, the thickness of the adhesive resin composition layer of the present invention is set to 5 μm or more, preferably 10 μm or more.
The laminated sheet in the present invention includes long and cut short films and sheets. Further, the base sheet includes a single layer and a laminate consisting of a plurality of layers. In addition, the laminated sheet laminated with the adhesive resin composition of the present invention can be used as a lid material as described later, and can also be used as a sealant film to form a bag (sealed with the adhesive resin composition surface as the inner surface). can also be suitably used.

<Lid material>
The laminated sheet of the present invention is cut according to the shape of the opening of the container body to be sealed, and is suitably used as a lid material.
The lid material of the present invention is preferably obtained by laminating a film of the adhesive resin composition of the present invention having a thickness of 5 to 40 μm on the polyethylene surface of a laminate of PET and polyethylene.

<Container body>
As the container main body, a container main body made of polyethylene resin and a container main body whose inner surface is covered with polyethylene resin are preferable.

<Openable sealed container>
An openable sealed container is one in which the opening of the container body is sealed with a cover material that is cut to match the shape of the opening of the container body. That is, the adhesive resin composition of the present invention provided on one surface of the lid member and the adhesive surface (also referred to as a flange) of the opening of the sealed container are brought into contact with each other and heated to bond them together. . The bonding conditions are preferably 130 to 170°C.
When the container body is a PET container, the container body and the lid material are preferably heat-bonded at a heat-bonding temperature of 130 to 170° C., the opening strength at room temperature is in the range of 10 to 20 N, and the peeling is performed. It is preferred that the thermal adhesive layer exhibits interfacial peeling. The openable seal of the present invention can be used to package, for example, jelly, pudding, yogurt, frozen desserts, dry sweets, cup noodles, and the like.

EXAMPLES The present invention will be described below based on examples, but the present invention is not limited by these. In the examples, "parts" and "%" represent "mass parts" and "mass%", respectively.

MFR, viscosity and melting point were measured by the following methods.

[MFR]
JIS. According to K7210, using a melt indexer L244 (Takara Kogyo Co., Ltd. melt indexer), a cylinder with an inner diameter of 9.55 mm and a length of 162 mm was filled with the sample, melted at 190 ° C. or 230 ° C., and weighed. Using a plunger with a diameter of 2.16 kg and a diameter of 9.48 mm, a load is evenly applied, and 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 cylinder. was measured.

[viscosity]
Using VISCOMETER TVB-10 (B-type viscometer manufactured by TOKI SANGYO), at a temperature of 140 ° C. or 180 ° C., rotor No. Measured at 3, 12 rpm, time 30 seconds.

[DSC melting point]
Using a DSC-60A plus (differential scanning calorimeter manufactured by Shimadzu Corporation), about 5 mg of a sample was weighed on an aluminum pan under a nitrogen stream at a temperature range of 0 ° C to 200 ° C at a heating rate of 10 ° C / min. The maximum value of the endothermic curve measured at .

<Method for producing adhesive resin composition>
[Example 1]
The polyethylene resin (A), polypropylene resin (B), polyethylene wax (C) and additives were preblended for 5 minutes using the materials and blending amounts shown in Table 1 using a Henschel mixer. The pre-blend was put into a hopper and supplied to the following extruder using a screw feeder to obtain an adhesive resin composition of Example 1.
≪Extruder conditions≫
Extruder: co-rotating twin-screw extruder PMT32-40.5 manufactured by IKG
Barrel temperature: 180°C (supply port 160°C)
Screw rotation speed: 200 rpm
Feed rate: 10kg/hr

[Examples 2 to 14 and Comparative Examples 1 to 9]
Adhesive resin compositions of Examples 2 to 14 and Comparative Examples 1 to 9 were obtained in the same manner as in Example 1 according to the compositions in Tables 1 and 2.

<Evaluation of adhesive resin composition>
MFR was measured for the resulting adhesive resin composition. In addition, a laminated sheet (lid material) was prepared according to the following, and using the laminated sheet, lamination strength (adhesion to base material), stringing (adhesion resistance to container), opening strength (easy opening property), It was evaluated based on the following methods and criteria. Table 1 shows the results.

(Method for producing laminated sheet (lid material))
Using an extrusion laminator, the obtained adhesive resin composition was laminated to a thickness of 20 μm on the PE surface (backing material) of a PET 20 μm/PE 12 μm base sheet to prepare a laminated sheet. Processing conditions are shown below.
Extrusion laminator: 400M/M Test EXT laminator manufactured by Musashino Kikai Resin temperature directly below the die: 250°C to 280°C
Processing speed: 30m/min T die width: 400mm
Cooling roll surface temperature: 20°C

<Coatability>
Coatability with an extrusion laminator was evaluated according to the following criteria.
○: Die discharge width - actual coating width = less than 50 mm: good △: Die discharge width - actual coating width = 50 mm to 100 mm: Usable ×: Die discharge width - actual coating width = greater than 100 mm: defective

<Lami strength (adhesion to base material)>
After the obtained laminated sheet (lid material) was cut into a size of 50 mm×70 mm, the base material layer and the adhesive resin composition layer were separated by hand into 50 mm×20 mm. Measurements were performed in a constant temperature and humidity chamber at a temperature of 23° C. and a humidity of 65% under the conditions of T-peeling and a tensile speed of 200 mm/min.
○: The layer of the adhesive resin composition and the layer of the base material cannot be peeled off: Good △: The opening strength is 1.5 N / 50 mm or more, or the layer of the adhesive resin composition is broken: Usable ×: Opened Strength is less than 1.5 N / 50 mm or more: Poor -: Cannot be measured because it could not be coated <stringing (container adhesion resistance)>
The presence or absence of the adhesive resin composition on the flange portion of the PET container during the measurement of the opening strength was visually confirmed and evaluated according to the following criteria.
○: No adhesive resin composition on the flange: Good △: Slight adhesive resin composition on the flange: Usable ×: Adhesive resin composition on the flange : Poor -: Cannot be measured because the lamination strength was not obtained (the adhesive resin composition did not adhere to the base material)

<Opening strength (easy opening property)>
After cutting the obtained laminated sheet (lid material) into a size of 90 mm × 90 mm, the adhesive resin composition surface was heat-bonded to a 71Φ PET container at a gauge pressure of 0.3 MPa, 150 ° C., and 1 second, and sealed. rice field. Leave it for 24 hours in a constant temperature and humidity room with a temperature of 23 ° C and a humidity of 65%, measure it under the conditions of 45 ° angle peeling and tensile speed of 200 mm / min in the same constant temperature and humidity room. The properties were evaluated according to the following criteria.
○: Opening strength is 10 N or more and less than 20 N: Good △: Opening strength is 7 N or more and less than 10 N, or 20 N or more and less than 25 N: Usable ×: Opening strength is less than 7 N, or 25 N or more: Poor -: Laminated Cannot be measured because no strength was obtained (the adhesive resin composition did not adhere to the base material)

The raw material abbreviations used in Tables 1 and 2 are shown below.
A1: HP0830NN (manufactured by SABIC, low-density polyethylene, 190°C, MFR 0.8 g/10 minutes measured under a load of 2.16 kg)
A2: HP7022 (manufactured by SABIC, ethylene-propylene copolymer, 190° C., MFR 7 g/10 min measured under a load of 2.16 kg, DSC melting point 108° C.)
A3: LDF260YZ (manufactured by LOTTE CHEMICAL TITAN, low-density polyethylene, 190 ° C., MFR 5 g / 10 minutes measured under a load of 2.16 kg)
A4: XJ700 (manufactured by LOTTE, low-density polyethylene, 190 ° C., MFR 24 g / 10 minutes measured under a load of 2.16 kg)

B1: B-110 (manufactured by LOTTE, polypropylene, 230 ° C., MFR 0.5 g / 10 minutes measured under a load of 2.16 kg)
B2: SB-520 (manufactured by LOTTE, propylene-ethylene copolymer, MFR 2 g/10 min measured under conditions of 230 ° C., load 2.16 kg, DSC melting point 150 ° C.)
B3: 513A (manufactured by SABIC, polypropylene, 230 ° C., MFR 6 g / 10 minutes measured under a load of 2.16 kg)
B4: J-360 (manufactured by LOTTE, propylene-ethylene copolymer, MFR 18 g/10 min measured under conditions of 230 ° C., load 2.16 kg, DSC melting point 148 ° C.)

C1: L-C102N (manufactured by LION CHMTECH, polyethylene wax, viscosity 350 mPa s (140° C.), melting point 107° C.)
C2: A-C735 (manufactured by Honeywell, polyethylene wax, viscosity 6,000 mPa s (140° C.), melting point 110° C.)
C3: 200P (manufactured by Mitsui Chemicals, polyethylene wax, viscosity 80 mPa s (140°C), melting point 130°C)
C4: 4051E (manufactured by Mitsui Chemicals, oxidized polyethylene wax, viscosity 500 mPa s (140°C), melting point 120°C)
C5: Sasol H1 (manufactured by Sasol, paraffin wax, viscosity 8 mPa s (140 ° C.), melting point 70 ° C.)
C6: NP055 (manufactured by Mitsui Chemicals, polypropylene wax, viscosity 50 mPa s (180 ° C.), melting point 150 ° C.)

Antiblocking agent: Incroslip C (manufactured by Croda, erucic acid amide) 0.1% external addition Antioxidant: IRGANOX 1010 (manufactured by BASF, hindered phenol) 0.1% external addition

As shown in Tables 1 and 2, in comparison with Comparative Examples 1 to 9, Examples 1 to 14, which contain specific resins (A) to (C) in specific ratios, have sufficient lamination for the base material with respect to polyethylene. It was shown that stringiness can be suppressed by expressing strength, and both excellent easy-openability can be achieved.

Claims (5)

A polyethylene resin (A) having a melt flow rate of 0.1 to 10 g/10 minutes measured under conditions of 190°C and a load of 2.16 kg, and a melt flow rate of 0 measured under conditions of 230°C and a load of 2.16 kg. 35 to 70% by mass of polyethylene resin (A) and 15 to 40% by mass of polypropylene resin (B) in total 100% by mass of polypropylene resin (B) and polyethylene wax (C) at 1 to 10 g/10 min. % by mass, and 8 to 40% by mass of polyethylene wax (C). The content ratio of polyethylene resin (A) and polypropylene resin (B) is (A)>(B), and the content ratio of polyethylene resin (A) and polyethylene wax (C) is (A)>(C). The adhesive resin composition according to claim 1, which is 3. The adhesive resin composition according to claim 1, wherein the adhesive resin composition has a melt flow rate of 5 to 45 g/10 minutes measured under conditions of 190° C. and a load of 2.16 kg. A laminated sheet in which a film of the adhesive resin composition according to any one of claims 1 to 3 is laminated on a base sheet. A lid material comprising the laminated sheet according to claim 4 .