JP2013082914A - Resealable sealing sheet, resealable packaging container, and method for manufacturing these - Google Patents

Abstract

[PROBLEMS] To release sufficient initial opening strength when peeling a lid from a container, and a part of an adhesive layer remains in a heat-sealed portion on the lid side or is drawn out into a string (threading) And a resealable sealing sheet and a resealable packaging container that can be easily sealed with practically sufficient strength.
A substrate (X), an adhesive layer (Y) formed on at least a part of the substrate (X), the adhesive layer (Y), and a surface layer. The adhesive layer (Z) is formed, and the pressure-sensitive adhesive layer (Y) is tacky at 25 ° C. and is formed of a hot-melt pressure-sensitive adhesive. The adhesive layer (Z) is 25 A resealable sealing sheet that is free of tack at 0 ° C. and is formed of a hot melt adhesive.
[Selection figure] None

Description

  The present invention relates to a resealable sealing sheet and a method for producing the same. Furthermore, it is related with the resealable packaging container provided with the said resealable sealing sheet, and its manufacturing method.

  Conventionally, plastics such as paper polyethylene (hereinafter sometimes abbreviated as paper poly) containers, polypropylene containers, polystyrene containers, etc. as packaging containers for cup noodles, cup soups, snacks, frozen desserts such as yogurt and jelly Containers made of metal, such as iron and aluminum, are used. As a lid material for these containers, a laminate using an adhesive resin is usually used on the surface to be bonded to the container body. Examples of the configuration of the laminate include paper / polyethylene film / aluminum foil / polyethylene film / adhesive resin layer, PET film / aluminum foil / polyethylene film / adhesive resin layer, and the like. Since the adhesive resin layer of the lid material of the above configuration example is bonded to the container main body by heat sealing (thermal fusion), it cannot be bonded to the container main body again after being peeled off.

  In the market, lid materials and packaging containers having a characteristic (hereinafter also referred to as resealability) that allow pasted lid materials to be bonded again have been demanded, and intensive studies have been conducted. As a technique for expressing resealability, a method of forming an adhesive layer and an adhesive layer by an extrusion method has been proposed.

  The extrusion method is a method in which a pressure-sensitive adhesive or an adhesive is melted in a high temperature environment, and is formed by an extrusion molding machine in a molten state. Among the extrusion methods, a method of forming a heat-sealing (heat-sealing) layer by laminating on a substrate while extruding into a film form is an extrusion laminating method. The viscosity in the molten state at the time of extrusion is, for example, 1 million mPa · s or more in a viscometer, or less than 100 (g / 10 minutes) in MFR (melt flow rate), and has a very high viscosity. Yes.

  Patent Document 1 proposes a packaging material in which an adhesive layer and an adhesive layer are superimposed on a base material of a container body so that an adhesive layer that can be heat-sealed with the inner surface of the lid material is located on the surface. Has been. Patent Documents 2 to 5 propose a cover material in which a pressure-sensitive adhesive layer and an adhesive layer are superimposed on a base material so that an adhesive layer that can be heat-sealed with a container body is located on the surface. ing.

  Specifically, in Patent Document 1, in the container (A), a layer (2) that can be combined on the support layer (1) / pressure-sensitive adhesive layer (3) / weld layer that can be easily broken ( A resealable packaging material having a structure (C) comprising 4) and a structure comprising a support layer (6) / welding layer (5) on the cover material (B) has been proposed. Examples of the method for forming the structure (C) include co-extrusion, extrusion bonding, heat calendering or extrusion coating.

  Patent Document 2 discloses resealability in which a pressure-sensitive adhesive layer is formed on the surface of a base material by an extrusion lamination method, and a heat-sealing agent layer is formed on the pressure-sensitive adhesive layer by a lacquer-type heat sealant. A packaging material having been proposed.

  Patent Document 3 discloses a surface resin layer / adhesive resin layer (containing a hydrogenated rubber block copolymer containing a styrene block and a diene block and a tackifier) / heat seal resin layer. A multilayer film laminated in order has been proposed. In the examples, a method for producing a coextruded multilayer film is disclosed.

  Patent Document 4 discloses a lid material composed of an outer layer resin layer / adhesive resin intermediate layer / inner layer heat seal resin layer, and the heat seal resin layer is provided with an easy-opening portion along the heat seal portion. Resealable lid materials have been proposed. Specifically, use of polypropylene is disclosed as the inner heat seal resin layer.

  Patent Document 5 discloses a packaging container in which any one of a container body and a lid material has a heat seal layer, an adhesive layer adjacent to the heat seal layer, and a base material layer, and the container body and the lid A packaging container having a fitting portion with a material has been proposed. Specifically, use of polypropylene is disclosed as the inner heat seal resin layer.

JP 2001-10659 A JP 2005-41539 A JP 2003-175567 A JP 11-171250 A JP 2008-179410 A

However, the market demanded excellent initial adhesive strength and resealability between the container and the lid. For example, in Cited Document 1, the structure (C) constituting the container (A), that is, the layer (2) that can be combined / the pressure-sensitive adhesive layer (3) / the welded layer (4) that can be broken is: The polymer component that has formed the weld layer (4) is drawn out into a string at the time of opening (threading), and the pressure-sensitive adhesive layer (3) has a low adhesive strength, making it difficult to obtain practically necessary resealability. was there.
Further, since resealability is expressed by a combination of a special container and lid, there is a problem that resealability cannot be expressed in plastic containers such as general paper polyethylene containers, polypropylene containers, and polystyrene containers. It was.

Further, the pressure-sensitive adhesive layer in Patent Document 2 has a low pressure-sensitive adhesive strength, and the resealability necessary for practical use cannot be obtained.
Moreover, in patent document 3, there existed a problem that the polymer which had formed the heat-sealing layer remained at the time of opening, or was drawn out in the shape of a thread | yarn (threading). Furthermore, the adhesive resin layer has a problem that adhesive strength is small and reseal strength is weak. Further, in Patent Document 5, since a heat-seal layer is formed by extruding a polymer having a high melt viscosity, such as polyethylene or an ethylene-based copolymer, the polymer that has formed the heat-seal layer may remain at the time of opening. There was a problem of being pulled out into a thread shape (threading).

  The present invention has been made in view of the above problems, and when the cover member is peeled off from the container, it exhibits a sufficient initial opening strength, and a part of the adhesive layer is heat-sealed on the cover member side. To provide a resealable sealing sheet and a resealable packaging container that are difficult to remain in a part or drawn out into a thread shape (threading), have a practically sufficient strength, and can be easily sealed, and methods for producing the same. Objective.

  As a result of extensive studies by the present inventors, when the container and the lid material are opened by using the following pressure-sensitive adhesive layer and adhesive layer instead of the pressure-sensitive adhesive layer and adhesive layer classified as so-called sealants. As a result, the present invention has been completed. That is, the resealable sealing sheet according to the present invention includes a base material (X), an adhesive layer (Y) formed on at least a part of the base material (X), and the adhesive layer (Y). And an adhesive layer (Z) formed on the surface layer. The pressure-sensitive adhesive layer (Y) has tack at 25 ° C. and is formed of a hot-melt pressure-sensitive adhesive, and the adhesive layer (Z) has no tack at 25 ° C. and is a hot-melt adhesive. It is formed by.

According to the resealable sealing sheet of the present invention, not a so-called sealant type high-viscosity pressure-sensitive adhesive and adhesive, but an adhesive called “hot melt” having a lower viscosity at the time of melting than the sealant type. The pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) are provided using a pressure-sensitive adhesive (hereinafter referred to as “hot-melt pressure-sensitive adhesive” and “hot-melt adhesive”). Thereby, when peeling a cover material from a container, it can peel favorably in the interface vicinity of an adhesive layer (Y) and an adhesive bond layer (Z). That is, when the resealable sealing sheet is peeled off from the container, a part of the adhesive layer can be peeled off without remaining in the heat-sealed portion on the lid material side or being drawn out into a string (threading). In addition, sufficient initial opening strength can be expressed. In addition, the adhesive layer (Y) remains in the opened portion on the resealable sealing sheet side, and the adhesive layer (Z) formed on the resealable sealing sheet moves to the container body side. And when resealing the adhesive layer (Y) remaining on the resealable sealing sheet side and the adhesive layer (Z) moved to the container body, it can be sealed with a practically sufficient strength.
The present inventors use a hot-melt pressure-sensitive adhesive / hot-melt adhesive without using a high-viscosity sealant adhesive or pressure-sensitive adhesive, so that stringing does not occur when the lid is opened from the container. It is considered that the adhesive force at the time of resealing could be increased more effectively. In the present invention, resealing the resealable sealing sheet is referred to as reseal or reseal.

The melt viscosity at 150 ° C. of the hot melt pressure-sensitive adhesive and the hot melt adhesive is preferably 100 to 100,000 (mPa · s).
As a preferred embodiment of the resealable sealing sheet, the hot melt adhesive contains a styrene elastomer (A), mineral oil (B), and a tackifier resin (C1), and the hot melt adhesive is A wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifying resin (C2) are included, and the tackifying resin (C1) and the tackifying resin (C2) are the same or different resins. The aspect which is is mentioned.
Moreover, as a preferable aspect of the resealable sealing sheet, the hot melt adhesive includes a styrene elastomer (A), a mineral oil (B), and a tackifier resin (C1), and the hot melt adhesive. Includes a wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifier resin (C2), and the tackifier resin (C1) and the tackifier resin (C2) are the same or When the total of the styrene-based elastomer (A), the mineral oil (B), and the tackifying resin (C1) of the hot-melt pressure-sensitive adhesive is 100% by weight, the styrene-based elastomer (A ) Is 5 to 60 wt%, the mineral oil (B) is 10 to 70 wt%, the tackifying resin (C1) is 10 to 70 wt%, the wax (D) of the hot melt adhesive, When the total of the ethylene-unsaturated ester copolymer (E) and the tackifier resin (C2) is 100% by weight, the wax (D) is 5 to 50% by weight, and the ethylene-unsaturated ester copolymer The aspect which a polymer (E) is 20 to 80 weight% and the said tackifier resin (C2) is 10 to 60 weight% is mentioned.

  The resealable packaging container of the present invention comprises the resealable sealing sheet of the above aspect and a container body.

  The manufacturing method of the resealable packaging container of this invention includes the process of heat-pressing the resealable sealing sheet of the said aspect to the opening part of a container main body.

The manufacturing method of the resealable sealing sheet of this invention is a process (1) which obtains an adhesive layer (Y) with a tack at 25 degreeC by apply | coating a hot-melt adhesive on a base material (X). ,
It includes a step (2) of obtaining an adhesive layer (Z) having no tack at 25 ° C. by applying a hot melt adhesive on the pressure-sensitive adhesive layer (Y) having a tack at 25 ° C. In the present invention, the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) are distinguished by the presence or absence of tack at 25 ° C.

  According to the present invention, when the resealable sealing sheet is peeled from the container, a sufficient initial opening strength (initial adhesive strength) is expressed, and a part of the adhesive layer is applied to the heat-sealed portion on the lid material side. Resealable sealing sheet and resealable packaging container that are difficult to remain and difficult to be pulled out (threaded) and can be easily sealed with sufficient strength when resealed, and these There is an excellent effect that a manufacturing method can be provided.

  Hereinafter, an example of an embodiment to which the present invention is applied will be described. Needless to say, other embodiments are also included in the scope of the present invention as long as they meet the spirit of the present invention.

  The resealable sealing sheet of the present invention comprises a base material (X), an adhesive layer (Y) formed on at least a part of the base material (X), and the adhesive layer (Y). And an adhesive layer (Z) formed on the surface layer. The pressure-sensitive adhesive layer (Y) has tack at 25 ° C. and is formed of a hot melt pressure-sensitive adhesive, and the adhesive layer (Z) has no tack at 25 ° C. and is formed of a hot-melt adhesive. It has been done. The resealable sealing sheet of the present invention is only required to have the adhesive layer (Z) disposed on the surface layer when sealing with the container. In the stage before bonding with the container, a release sheet, a protective sheet, etc. May be formed on the adhesive layer (Z). That is, the “adhesive layer (Z) formed on the surface layer” may be formed on the surface layer when sealing with the container, and is not necessarily on the surface layer at the stage of producing and selling the resealable sealing sheet. It may not be arranged.

  In the present invention, a hot melt adhesive and a hot melt pressure sensitive adhesive are used instead of an adhesive and a pressure sensitive adhesive classified as a so-called sealant. As a result of extensive studies by the present inventors, it has been found that superior characteristics can be obtained as compared with adhesives and pressure-sensitive adhesives classified as conventional sealants, and the present invention has been completed.

  The hot-melt adhesive and hot-melt pressure-sensitive adhesive of the present invention are solid at room temperature, have the property of being meltable by heating and capable of being coated, and further being excellent in coatability in a molten state . The hot melt adhesive and the hot melt pressure-sensitive adhesive of the present invention are not particularly limited as long as they do not depart from the gist of the present invention, but in a molten state, the viscosity is 100 to 100,000 mPa · s, or the MFR is 100 (g / 10 min). ) Those having a relatively low viscosity that satisfy the above conditions are preferred. Variations in the layer forming method can be enhanced by using a material having a viscosity of 100 to 100,000 mPa · s in a molten state or an MFR of 100 (g / 10 minutes) or more. More preferably, it is in a molten state at a temperature of 150 ° C., and it is more preferable that the viscosity is 100 to 100,000 mPa · s or MFR is 100 (g / 10 minutes) or more at the temperature. For example, in addition to extrusion lamination, a method of applying a heat-sealing (heat-sealing) layer by coating on a substrate with a coating machine such as a roll coater or a curtain coater can be suitably applied. In this specification, it is preferable that these hot-melt pressure-sensitive adhesives and hot-melt adhesives do not contain a solvent.

  The substrate (X) is not particularly limited as long as it does not depart from the gist of the present invention. For example, a polyester film, a nylon film, vinylidene chloride, an aluminum foil, a polyolefin film such as polyethylene or polypropylene, or a laminate thereof is preferable. . Although the thickness of base material (X) is not specifically limited, 3-200 micrometers is preferable.

  The pressure-sensitive adhesive layer (Y) of the present invention is formed of a hot-melt pressure-sensitive adhesive as described above, and has tack at 25 ° C. With the tack, it can be resealed. The presence or absence of tack can be determined by whether or not the user feels tack when touched with a finger. More specifically, in the present invention, “there is tack at 25 ° C.” means an inclined ball tack test ( This is a state in which a ball having a “ball nominal” prescribed in JIS B 1501 (rolling bearing—steel ball) of 1/16 (diameter 1.5875 mm) stops on a sample inclined at an angle of 30 °.

  The hot melt adhesive preferably contains a styrene elastomer (A), a mineral oil (B), and a tackifier resin (C1).

The styrene-based elastomer (A) essentially contains styrene and is preferably an elastic body. Specifically, for example, a styrene block copolymer is preferable. A styrene block copolymer generally has a styrene block and a rubber intermediate block, and the polystyrene part forms a physical cross-link (domain) to serve as a bridging point. Give elasticity. The intermediate soft segment includes polybutadiene (B), polyisoprene (I), and polyolefin elastomer (ethylene propylene, EP). Depending on the arrangement of the hard segment with polystyrene (S), linear (linear type) And radial (radical type).
In the present invention, styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-isoprene-styrene block copolymer (SIS), styrene-butylene. -A butadiene-styrene block copolymer (SBBS) etc. are more preferable, and a styrene-ethylene-butylene-styrene block copolymer (SEBS) is further more preferable. Alternatively, a mixture (SEBS / SEB) of a styrene-ethylene / butylene-styrene block copolymer (SEBS) and a styrene-ethylene / butylene block copolymer (SEB) is also preferable.

The melt flow rate (MFR) at 230 ° C. and 5 kg load of the styrene elastomer (A) is preferably 0.1 to 100 (g / 10 minutes), and is 0.3 to 70 (g / 10 minutes). More preferably. When the MFR is 0.1 (g / 10 min) or more, the adhesive force of the pressure-sensitive adhesive layer to be formed can be secured, and the resealability after opening can be improved. On the other hand, when the MFR is 100 (g / 10 min) or less, excellent coating properties can be obtained when the adhesive (Y) is applied to the base film. That is, rubbing and stringing can be made difficult to occur at the time of applying the adhesive.
The styrene unit amount of the styrene-based elastomer (A) is preferably 10 to 40 wt%, more preferably 15 to 35 wt%, and most preferably 25 to 35 wt%. By setting the styrene unit amount to 10 wt% or more, the cohesive force of the hot melt pressure-sensitive adhesive can be increased. On the other hand, when the amount of the styrene unit is 40 wt% or less, rubbing and stringing are less likely to occur during application of the adhesive.
It should be noted that the stringing at the time of adhesive coating is the adhesive around the coating machine when the molten adhesive from the coating machine is applied to the substrate and the substrate leaves the coating machine. Refers to the phenomenon of sticking in a string.
The melt flow rate (MFR) is measured in accordance with JIS K 7210, and under conditions such as 190 ° C., 2.16 kg load, 200 ° C., 2.16 kg load, 230 ° C., 5 kg load. The effluent amount for 10 minutes (g / 10 minutes). The higher the temperature and the heavier the load, the larger the MFR value. The MFR of the styrene-based elastomer (A) used in the present invention is a value in the case of 230 ° C. and 5 kg load as described above.

  Mineral oil (B) is a low molecular weight compound fractionated during petroleum refining, and is generally a mixture of hydrocarbons containing aromatics, hydrocarbons containing naphthenic rings, paraffin chains, and the like. Of the mineral oils, paraffinic mineral oils in which the number of carbon atoms in the paraffin chain accounts for 50% or more of the total number of carbon atoms is preferable. Generally, paraffinic mineral oils with a paraffin chain carbon number occupying 50% or more of the total carbon number, naphthenic mineral oils with a naphthenic ring carbon number of 30-40% of the total carbon number, and aromatic carbon number What occupies 30% or more of the total carbon number is called aromatic mineral oil.

The weight average molecular weight of the mineral oil (B) is preferably 100 to 10,000, more preferably 300 to 10,000, and further preferably 400 to 9,500. Bleed out can be reduced when the weight average molecular weight is 100 or more. On the other hand, it becomes easy to ensure the fluidity | liquidity at the time of coating by becoming 10,000 or less. The weight average molecular weight is a polystyrene-reduced weight average molecular weight by gel permeation chromatography (hereinafter also abbreviated as “GPC”).
The weight average molecular weight by GPC in the present invention is a polystyrene conversion obtained by flowing a dilute resin solution through a column packed with gel-like particles and measuring different times until it flows out depending on the molecular size. The weight average molecular weight.
Specific measurement conditions are as follows.
Equipment: Prominence made by Shimadzu Corporation
Column: manufactured by TOSOH TSKgel GMH × 2 connected detector: RID-10A
Solvent: THF (tetrahydrofuran)
Column temperature: 40 ° C
Flow rate: 1 mL / min

  The tackifying resin (C1) is a phenol resin, a modified phenol resin, a terpene phenol resin, a xylene phenol resin, a cyclopentadiene-phenol resin, a xylene resin, an aliphatic, an alicyclic, an aromatic petroleum resin, hydrogen, etc. Added aliphatic, alicyclic, aromatic, etc. petroleum resins, phenol-modified petroleum resins, rosin ester resins, hydrogenated rosin ester resins, low molecular weight polystyrene resins, terpene resins, hydrogenated A terpene resin or the like is preferable. The tackifier resin (C1) may be used alone or in combination of two or more.

  The tackifying resin (C1) preferably has a softening point of 80 to 160 ° C. When the softening point is 80 ° C. or higher, it becomes easy to balance the adhesive force and the cohesive force. On the other hand, by setting the softening point to 160 ° C. or lower, it becomes easy to maintain tack even in a low temperature atmosphere. In addition, in this invention, a softening point is the temperature calculated | required by the method prescribed | regulated to JISK6863. A more preferable range of the softening point of the tackifier resin (C1) is 80 to 140 ° C, and a more preferable range is 90 to 130 ° C.

The hot melt pressure-sensitive adhesive containing the styrene-based elastomer (A), the mineral oil (B), and the tackifier resin (C1) has a total weight of (A) to (C1) of 100% by weight. ): 5 to 60% by weight, mineral oil (B): 10 to 70% by weight, tackifying resin (C1): preferably 10 to 70% by weight, (A): (B): (C1) = It is more preferable to contain 10 to 40% by weight: 20 to 50% by weight, and 25 to 60% by weight, and among these, the tackifier resin (C1) is more preferably 30 to 55% by weight.
When the content of the styrene elastomer (A) is 5% by weight or more and the content of the mineral oil (B) is 10% by weight or more, the processability of the sheet is easily maintained.
On the other hand, by setting the content of the styrene elastomer (A) to 60% by weight or less, it becomes easy to maintain tack even in a low-temperature atmosphere.
Moreover, it becomes easy to maintain cohesion force by making content of mineral oil (B) and tackifying resin (C1) 70 weight% or less.
By making the content of the tackifier resin (C1) 10% by weight or more, it becomes easy to maintain the adhesive force.

The hot melt pressure-sensitive adhesive used in the present invention preferably has a melt viscosity at 150 ° C. of 100 to 100,000 mPa · s, more preferably 500 to 50,000 mPa · s, and 1,000 to 20,000 mPa · s. -Most preferred is s.
When a hot melt adhesive is laminated on the formed pressure-sensitive adhesive layer (Y) by using a hot melt pressure-sensitive adhesive having a melt viscosity at 150 ° C. of 100 mPa · s or more, the pressure-sensitive adhesive layer (Y) It is easy to maintain the shape, and the hot melt pressure-sensitive adhesive layer (Y) is less crushed by the pressure during heat sealing. On the other hand, when a hot melt adhesive having a melt viscosity at 150 ° C. of 100,000 mPa · s or less is used, it is possible to suppress rubbing and stringing during coating.
The melt viscosity was measured using a dynamic viscoelasticity measuring device Rheosol-G3000 manufactured by UBM Co., Ltd., a simple cone with a φ40 mm inclination angle of 2 ° was installed at the upper part of the measurement unit, and a simple plate with a φ40 mm was installed at the lower part. The sample was sandwiched between a cone having a gap of 50 μm and a plate, held at 150 ° C. for 15 minutes, and then measured at a shear rate of 2.9 (cm ⁻¹ ) under the same conditions.

  The hot melt adhesive preferably contains a wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifier resin (C2). Examples of the tackifier resin (C2) are the same as the tackifier resin (C1) described above. The tackifying resin (C1) and the tackifying resin (C2) may be the same or different.

The wax (D) is blended for the purpose of reducing the viscosity of the hot melt adhesive and facilitating coating. Specifically, for example, carnauba wax, canderia wax, montan wax, paraffin wax, microwax, Fischer-Tropsch wax, polyethylene wax, polypropylene wax, oxides of these waxes, ethylene-acrylic acid copolymer, ethylene-methacrylic acid. An acid copolymer etc. are mentioned. Wax (D) can be used individually or in combination of 2 or more types.
The weight average molecular weight of these waxes (D) is preferably 1,000 or less.
Further, the melt viscosity at 150 ° C. of these waxes (D) is preferably 10 to 2,000 (mPa · s), more preferably 15 to 1,000 (mPa · s), and more preferably 15 to 1,000 (mPa · s). More preferably, it is 500 (mPa · s).

The ethylene-unsaturated ester copolymer (E) contained in the hot melt adhesive is a copolymer of ethylene and an unsaturated ester.
The MFR of the ethylene-unsaturated ester copolymer (E) at 190 ° C. and a load of 2.16 kg is preferably 10 to 2,500 (g / 10 minutes) and more preferably 15 to 1,000 (g / 10 minutes). 20 to 400 (g / 10 min) is more preferable. By using the ethylene-unsaturated ester copolymer (E) having an MFR of 10 (g / 10 min) or more, the viscosity of the hot melt adhesive can be easily maintained in an appropriate range. Moreover, it becomes easy to maintain the cohesion force of the adhesive layer (Z) by using an ethylene-unsaturated ester copolymer (E) having an MFR of 2,500 (g / 10 min) or less.

The unsaturated ester constituting the ethylene-unsaturated ester copolymer (E) is preferably a (meth) acrylic acid alkyl ester, an unsaturated carboxylic acid ester, a vinyl ester or the like.
Examples of (meth) acrylic acid alkyl esters include methyl (meth) acrylate, ethyl (meth) acrylate, isobutyl (meth) acrylate, n-butyl (meth) acrylate, isooctyl (meth) acrylate, (meth) Examples include methyl methacrylate, isobutyl (meth) methacrylate, dimethyl maleate, and diethyl maleate.
Examples of the unsaturated carboxylic acid ester include dimethyl maleate and diethyl maleate.
Examples of the vinyl ester include vinyl acetate and vinyl propionate.
Among these, as the unsaturated ester, vinyl acetate is preferable. Of the total 100% by weight of the monomers constituting the copolymer (E), vinyl acetate is preferably 5 to 40% by weight, and 25 to 40% by weight. It is more preferable that It becomes easy to ensure the adhesive force of the adhesive bond layer formed by vinyl acetate being 5 weight% or more. On the other hand, when the vinyl acetate is 40% by weight or less, the coating property when the hot melt adhesive is applied onto the hot melt pressure-sensitive adhesive layer is excellent.

The tackifier resin (C2) used for the hot melt adhesive can be the same as the tackifier resin (C1) used for the hot melt adhesive.
The tackifying resin (C2) used for the hot melt adhesive preferably has a softening point of 80 to 160 ° C. By making the softening point 80 ° C. or higher, it becomes difficult for the resealable sealing sheets to block each other. On the other hand, when the softening point is set to 160 ° C. or less, the heat sealing property is easily developed. In addition, in this invention, a softening point is the temperature calculated | required by the method prescribed | regulated to JISK6863. A more preferable range of the softening point of the tackifier resin (C2) is 90 to 150 ° C, and a more preferable range is 100 to 140 ° C.

The hot melt adhesive in the present invention includes a wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifier resin (C2), and the total of (D), (E), and (C2) is 100. In the case of weight%, the wax (D) is 5 to 50% by weight, the ethylene-unsaturated ester copolymer (E) is 20 to 80% by weight, and the tackifier resin (C2) is 10 to 60% by weight. (D): 10 to 40% by weight, (E): 25 to 70% by weight, (C2): 20 to 50% by weight is more preferable, (D): 20 to 30% by weight, (E): More preferably, it is 30-50 weight%, (C2): 30-40 weight%.
By setting the ethylene-unsaturated ester copolymer (E) to 20% by weight or more and the contents of the wax (D) and the tackifier resin (C2) within the above ranges, mainly the viscosity during coating and The balance of the peeling force at the time of opening can be set to an appropriate range. Further, by making the ethylene-unsaturated ester copolymer (E) 80% by weight or less, it is possible to suppress / prevent the remaining adhesive layer and stringing at the time of opening.

The hot melt adhesive used in the present invention preferably has a melt viscosity at 150 ° C. of 100 to 100,000 mPa · s, more preferably 500 to 50,000 mPa · s, and 1,000 to 20,000 mPa · s. -Most preferred is s.
By setting the melt viscosity in such a range, it is possible to form an adhesive layer that is easy to apply at the time of forming the adhesive layer and is less likely to cause stringing when the lid is opened.
The method for measuring the melt viscosity is the same as that for the hot melt pressure-sensitive adhesive.

Various types of hot melt pressure-sensitive adhesives and hot melt adhesives can be used as necessary as other additives. For example, coloring agents, antiblocking agents, antioxidants and the like.
Examples of the colorant include titanium oxide.
Examples of the antiblocking agent include silicone, unsaturated fatty acid amides such as erucic acid amide and oleic acid amide, and saturated fatty acid amides such as stearic acid amide and behenic acid amide.
Antioxidants include high molecular weight hindered polyhydric phenols, triazine derivatives, high molecular weight hindered phenols, dialkyl phenol sulfides, 2,2-methylene-bis- (4-methyl-6-tert-butylphenol), 4 , 4-methylene-bis- (2,6-di-tert-butylphenol), 2,6-di-tert-butylphenol-p-cresol, 2,5-di-tert-butylhydroquinone, 2,2 , 4-trimethyl-1,2-dihydroquinone, 2,2,4-trimethyl-1,2-dihydroquinone, nickel dibutyl dithiocarbamate, 1-oxy-3-methyl-4-isopropylbenzene, 4,4- Examples include butylidenebis- (3-methyl-6-tert-butylphenol) and 2-mercaptobenzimidazole.

Next, the manufacturing method of the resealable sealing sheet of this invention is demonstrated.
The resealable sealing sheet of the present invention comprises a step (1) of obtaining a pressure-sensitive adhesive layer (Y) having a tack at 25 ° C. by applying a hot-melt pressure-sensitive adhesive to the substrate (X), and further hot-melting It is preferable to include a step (2) of obtaining an adhesive layer (Z) having no tack at 25 ° C. by applying an adhesive. The coating is preferably performed using a hot melt coater. The coating temperature may vary depending on the material used, but is preferably 120 to 200 ° C, more preferably 140 to 180 ° C. In the coating, the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) may be formed at substantially the same timing, or may be formed at different timings. Alternatively, the adhesive layer (Z) may be formed after the molten pressure-sensitive adhesive layer (Y) is cooled.

  From the viewpoint of efficient production, a hot melt adhesive and a hot melt adhesive are continuously melt-coated on the substrate (X) almost simultaneously, and the adhesive layer (Y) and the adhesive layer (Z) are formed. The forming method is preferred.

Another aspect of the production method can also be obtained by laminating the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) separately produced on the release sheet to the base material (X) sequentially. In this case, it is preferable to heat at the time of lamination. Moreover, it does not exclude forming the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) by a production method other than these.
From the convenience of not requiring a special production apparatus, a method of forming the adhesive layer (Z) after forming the pressure-sensitive adhesive layer (Y) is preferable. From the viewpoint of efficient production, it is preferable to melt-coat the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) simultaneously or continuously. In addition, a method using a release sheet is preferable in that the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z) can be formed at different times and places.

  5-100 micrometers is preferable, as for the thickness of the adhesive layer (Y) formed, 20-70 micrometers is more preferable, and 30-50 micrometers is further more preferable. By making the thickness 5 to 100 μm, it is easy to obtain the adhesive strength when initially opening the resealable sealing sheet and the adhesive strength when resealing.

  The initial opening strength (adhesive strength) when the hot melt adhesive and the container body are heat-sealed varies depending on the composition of the hot melt adhesive, but varies depending on the thickness of the adhesive layer (Z) (usually The adhesive strength increases as the film thickness increases, and weakens as it decreases.) Therefore, the film thickness of the adhesive layer (Z) is adjusted to a film thickness that provides a desired adhesive force. Specifically, the thickness of the adhesive layer (Z) is preferably 5 to 100 μm, more preferably 10 to 50 μm, and still more preferably 15 to 30 μm. The adhesive layer (Y) is bonded to the adhesive layer (Y) while the adhesive layer (Z) and the container body have a strong adhesive force (opening force) when the lid is opened because the thickness is in the range of 5 to 100 μm. It becomes easy to adjust adhesive force so that it may peel between agent layers (Z).

  The resealable sealing sheet of the present invention preferably has good initial opening strength. For example, when the following measurement method is performed, it is preferably in the range of 10 to 20N. That is, about 90% of the cover material is used at an opening angle of 45 degrees and an opening speed of 300 mm / min using Tensilon RTA-100 (Orientec Co., Ltd.) in an environment of 23 ° C.-65% RH after heat sealing. It is preferable to fall within the above range when the strength at the time of peeling is measured. Thereby, both opening ease and sealing performance can be provided.

  The resealable sealing sheet of the present invention can be applied to various applications, and can be used for various applications that require sealing and resealing. As a preferable application example, an example used for the purpose of protecting contents by heat-sealing at an opening of a container can be given.

The resealable packaging container of the present invention is characterized by comprising a resealable sealing sheet and a container body. The container body preferably has a cup shape or a tray shape that can store a liquid or a solid. The resealable sealing sheet may be the lid material itself or a part of the lid material.
The material of the container body is preferably paper, polyolefin such as polyethylene or polypropylene, metal such as iron or aluminum, or a laminate thereof. Examples of the laminate include a paper / polyethylene laminate.
Examples of liquids and solids stored in resealable packaging containers include instant noodles, instant soups, snacks, and frozen desserts such as yogurt, jelly, and pudding.

  A resealable packaging container can be manufactured by performing a process of thermocompression bonding at least a resealable sealing sheet to the opening of the container. Specifically, it is preferable to heat seal the adhesive layer (Z) of the resealable sealing sheet on the container. The heat sealing is preferably performed at a temperature equal to or higher than the softening point of the adhesive layer (Z). When the lid of the resealable packaging container is opened, it can be satisfactorily peeled in the vicinity of the interface between the pressure-sensitive adhesive layer (Y) and the adhesive layer (Z). Furthermore, when the resealable sealing sheet is bonded again, it can be easily resealed by the pressure-sensitive adhesive layer (Y).

According to the resealable sealing sheet of the present invention, it has excellent resealability as compared with the case where a pressure-sensitive adhesive layer or adhesive layer classified as a so-called sealant is used.
According to the resealable sealing sheet and resealable packaging container of the present invention, when the cover material is peeled off from the container, sufficient initial opening strength is exhibited, and a part of the adhesive layer is heat-sealed on the cover material side. Therefore, it is possible to provide a material that is difficult to remain in a part or to be drawn out into a thread shape (yarn stringing), has a practically sufficient strength, and can be easily sealed.

  EXAMPLES Hereinafter, the present invention will be described specifically and in detail with reference to examples. However, these examples are only one aspect of the present invention, and the present invention is not limited to these examples. In the examples, “part” means “part by weight” and “%” means “% by weight”.

[Example 1]
<Method for producing hot melt adhesive>
Mineral oil and antioxidant (Irganox 1010) are added to a stainless steel beaker equipped with a stirrer with the composition shown in Table 1 and heated to 160 ° C., and stirring is started. Stirring elastomer and tackifying resin are added with stirring, and stirring is performed for 3 hours. Hot melt having a melt viscosity of 8500 (mPa · s) at 150 ° C. and an MFR of at least 1,000 (g / 10 min) at 190 ° C. An adhesive was obtained. It was confirmed that the obtained pressure-sensitive adhesive layer had tackiness at 25 ° C.

<Method for producing hot melt adhesive>
In a stainless beaker equipped with a stirrer, a wax and an antioxidant (Irganox 1010) having the composition shown in Table 1 are added and heated to 160 ° C., and stirring is started. While stirring, the ethylene-unsaturated ester copolymer and the tackifier resin were added, and the mixture was stirred for 3 hours. The melt viscosity at 150 ° C. was 5200 (mPa · s), and the MFR at 190 ° C. was 1000 or more (g / 10 min). A hot melt adhesive was obtained. The obtained adhesive layer was confirmed to have no tackiness.

The melt viscosity of the pressure-sensitive adhesive and the adhesive was measured using a dynamic viscoelasticity measuring device Rhesol-G3000 manufactured by UBM Co., Ltd. The sample was sandwiched between a cone and a plate having a gap of 50 μm in the center and held at 150 ° C. for 15 minutes, and then measured at a shear rate of 2.9 (cm ⁻¹ ) under the same conditions.
Further, the MFR of the pressure-sensitive adhesive and the adhesive was measured in accordance with JIS K 7210, and the amount of outflow for 10 minutes at 190 ° C. under a load of 2160 g was measured. In this case, it is a reference value because it flows out with little load.

<Method for producing resealable sealing sheet>
A laminate of PET film (thickness 12 μm) / aluminum foil (thickness 7 μm) / polyethylene (thickness 20 μm) is used as a base material, and a hot melt adhesive heated to 160 ° C. is applied onto the polyethylene with a hand coater to a thickness of 30 μm. The pressure-sensitive adhesive layer was formed.
After cooling at room temperature, a hot-melt adhesive heated to 160 ° C. was applied onto the pressure-sensitive adhesive layer with a hand coater to form a 20 μm adhesive layer, whereby a resealable sealing sheet was obtained.
According to the methods described later, initial opening strength, breakage of the resealable sealing sheet, stringing, peeled state of the paper polyethylene container, and peel strength after resealing were evaluated.

[Examples 2 to 47]
Using the pressure-sensitive adhesives and adhesives having the compositions described in Tables 1 to 5, pressure-sensitive adhesive layers and adhesive layers having various thicknesses were formed, and resealable sealing sheets were obtained in the same manner as in Example 1.

[Comparative Examples 1-3]
Instead of the hot melt adhesive in Example 1, an adhesive having the composition shown in Table 6 was obtained. Since these adhesives cannot be applied by a hand coater, the hot melt pressure-sensitive adhesive layer in Example 1 was obtained by heating and melting the adhesive using an extrusion laminator (400M / M test EXT laminator manufactured by Musashinokikai). Laminated on top. Other conditions were the same as in Example 1 to obtain a resealable sealing sheet.

[Comparative Example 4]
Instead of the hot melt pressure-sensitive adhesive in Example 1, a pressure-sensitive adhesive was obtained with the composition shown in Table 6. However, since the pressure-sensitive adhesive cannot be applied by a hand coater, an extrusion laminator (400M / M test EXT manufactured by Musashinokikai) A laminator was used to heat and melt the adhesive at about 250 ° C. onto the base polyethylene to obtain a 30 μm adhesive layer. A stop sheet was obtained.

[Comparative Example 5]
A pressure-sensitive adhesive layer and an adhesive layer were formed in the same manner as in Example 1 using the pressure-sensitive adhesive and adhesive having the composition described in Table 6, and a resealable sealing sheet was obtained in the same manner.

[Comparative Example 6]
Instead of the hot melt adhesive in Example 1, an adhesive having the composition shown in Table 6 was obtained in the same manner as in Example 1. The obtained pressure-sensitive adhesive was applied at 40 ° C. with a hand coater to form a pressure-sensitive adhesive layer. An adhesive layer was provided on the pressure-sensitive adhesive layer in the same manner as in Example 1 to obtain a resealable sealing sheet.

[Comparative Example 7]
A resealable sealing sheet was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive and adhesive having the composition shown in Table 6 were used and a pressure-sensitive adhesive layer was formed in the same manner as in Comparative Example 4.

[Comparative Examples 8 to 10]
A pressure-sensitive adhesive layer and an adhesive layer were formed in the same manner as in Example 1 using the pressure-sensitive adhesive and adhesive having the composition described in Table 6, and a resealable sealing sheet was obtained in the same manner.

<Physical property evaluation>
The state of the pressure-sensitive adhesive layer and the adhesive layer obtained in each Example / Comparative Example was visually evaluated.
○: Smooth coating was possible by visual evaluation.
X: It was not possible to coat smoothly by visual evaluation.
Moreover, in the adhesive layer obtained in each Example, it confirmed that all had tack property at 25 degreeC. Moreover, in the adhesive bond layer of each Example, it confirmed that all did not have tack property at 25 degreeC.

<Physical property evaluation>
The resealable sealing sheet was used as a lid, and the hot melt adhesive layer of the lid was superposed on the flange portion (width of about 4 mm) around the opening of the container body (outer diameter: 71 mmφ, inner diameter: about 67 mmφ). Then, using MODEL2005 (manufactured by Towa Techno Co., Ltd.), heat sealing was performed under the conditions of sealing temperature: 160 ° C., sealing pressure: 100 kgf / cup, sealing time: 1 second, and initial opening strength and the like were evaluated.
The container body is a paper container (hereinafter referred to as a “paper polyethylene” container or “paper poly” container), a polypropylene (PP) container, or a polystyrene (PS) container in which polyethylene film is laminated on the inner surface. Either.

(1) Initial opening strength After heat sealing, using a Tensilon RTA-100 type (manufactured by Orientec Co., Ltd.) in an environment of 23 ° C. to 65% RH, the opening material is 45 degrees and the opening speed is 300 mm / min. The strength when peeling about 90% was measured.
○: 10-20N
X: Less than 10N or more than 20N

(2) Breaking of the lid member The state of the lid member after the measurement of the adhesive strength was visually evaluated.
○: No lid breakage ×: Lid breakage

(3) Stringing The state of the flange part after the adhesive strength measurement was visually evaluated.
○: The adhesive layer peels off cleanly along the flange at the time of opening, the adhesive layer does not remain in the heat seal part on the lid side, and the adhesive layer on the heat seal part on the lid side is the flange part of the container body No filamentous material was generated.
X: The adhesive layer does not peel off cleanly along the flange at the time of opening, and a part of the adhesive layer remains in a thread form on the heat seal portion on the lid material side or the flange portion of the container body.

(4) Peeling state of paper polyethylene container When peeling the lid material which is a resealable sealing sheet, a part of the polyethylene film constituting the inner surface of the container body moves to the lid material side, and the flange portion of the container body The degree of exposure of a part of the paper was visually evaluated.
○: 20% or less of the paper of the flange portion was exposed.
(Triangle | delta): The paper of less than 50% was exposed exceeding 20% of a flange part.
X: Paper of 50% or more of the flange portion was exposed.

(5) Reseal strength After peeling the lid surface after measuring the opening strength as described above on the flange portion of the container body, after reciprocating 1 kg of roll from the top of the lid material and sealing again The opening strength was measured in the same manner as in the initial stage. Resealing and opening were repeated 5 times in total, and the opening strength was measured each time.
○: 3N or more Δ: 1N or more and less than 3N × less than 1N

<Styrene elastomer (A)>
A-1: Kraton G-1650 (manufactured by Kraton Polymer Japan, SEBS, styrene content 30%, weight average molecular weight 107,000, MFR: 3 (g / 10 min))
A-2: Kraton G-1657 (manufactured by Kraton Polymer Japan, SEBS, styrene content 15%, weight average molecular weight 150,000, MFR: 22 (g / 10 min))
A-3: SEPTON S-2063 (manufactured by Kuraray Co., Ltd., SEPS, styrene content 13%, weight average molecular weight 85,000, MFR: 21.7 (g / 10 min))
A-4: SEPTON S-4033 (Kuraray Co., Ltd., SEEPS, styrene content 30%, weight average molecular weight 95,000, MFR: 0.3 (g / 10 min))
A-5: Kraton D-1161 (manufactured by Kraton Polymer Japan, SIS, styrene content 17%, weight average molecular weight 150,000, MFR: 37.8 (g / 10 min))
A-6: DYNARON 1320P (manufactured by JSR Corporation, hydrogenated product of random copolymer comprising 10% by mass of styrene and 90% by mass of diene hydrocarbon, MFR: 10.9 (g / 10 min))
A-7: Kraton D-1126 (manufactured by Kraton Polymer Japan, SIS, styrene content 17%, weight average molecular weight 200,000, MFR: 64.8 (g / 10 min))
In addition, all said MFR is a value in 230 degreeC and a 5-kg load.

<Mineral oil (B)>
B-1: Diana process PW-32 (made by Idemitsu Kosan Co., Ltd., weight average molecular weight 500)
B-2: Idemits polybutene 100R (made by Idemitsu Kosan Co., Ltd., weight average molecular weight 1,800)
B-3: Idemits polybutene 2000H (made by Idemitsu Kosan Co., Ltd., weight average molecular weight 8,000)

<Tackifying resin (C1)>
C-1: Picotac 8095 (Eastman Chemical Co., partially hydrogenated petroleum resin, softening point 95 ° C.)
C-2: Superester A-115 (Arakawa Chemical Industries, rosin ester, softening point 115 ° C.)
C-3: Crystallex 5140 (manufactured by Eastman Chemical Co., a copolymer of α-methylstyrene and styrene, softening point 140 ° C.)
C-4: Clearon P-90 (manufactured by Yashara Chemical Company, fully hydrogenated terpene resin, softening point 90 ° C.)
C-5: Clearon P-115 (manufactured by Yashara Chemical Co., fully hydrogenated terpene resin, softening point 115 ° C.)
C-6: Alcon P-100 (Arakawa Chemical Industries, Ltd., alicyclic saturated hydrocarbon resin, softening point 100 ° C.)

<Wax (D)>
D-1: 150 (Nippon Seiki Co., Ltd., paraffin wax, melting point 66 ° C., melt viscosity at 150 ° C .: 17 (mPa · s))
D-2: Hi-Mic-2065 (Nippon Seiki Co., Ltd., microcrystalline wax, melting point 75 ° C., melt viscosity at 150 ° C .: 31 (mPa · s))
D-3: Sun wax 151-P (manufactured by Sanyo Chemical Co., Ltd., polyethylene wax, softening point 107 ° C., melt viscosity at 150 ° C .: 280 (mPa · s))
D-4: SASOL H1 (manufactured by South Africa SASOL, Fischer-Tropsch wax, melting point 82 ° C./110° C., melt viscosity at 150 ° C .: 18.6 (mPa · s))
D-5: Carnauba wax (Brazil Foncepi, Carnauba wax, melting point 85 ° C., melt viscosity at 150 ° C .: 16 (mPa · s))
D-6: Mitsui High Wax 4052E (Mitsui Chemicals, oxide wax, melting point 110 ° C., melt viscosity at 150 ° C .: 300 (mPa · s))
D-7: A-C5120 (manufactured by Honeywell, USA, ethylene-acrylic acid copolymer wax, melting point 120 ° C., melt viscosity at 150 ° C .: 520 (mPa · s))
In addition, said melting | fusing point was calculated | required with the differential scanning calorific value (DSC) measuring device made from PERKIN ELMER (device name: Pyris1, heating rate: 10 degree-C / min).
The melt viscosity at 150 ° C. is a value determined by the same method as that for the pressure-sensitive adhesive, adhesive, styrene elastomer (A) and the like described above.

<Ethylene-unsaturated ester copolymer (E), etc.>
E-1: Ultrasen 710 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer, MFR 18 g / 10 min, melt viscosity at 150 ° C .: 2,300,000 (mPa · s), vinyl acetate content 28%)
E-2: Ultrasen 750 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer, MFR 30 g / 10 min, melt viscosity at 150 ° C .: 1,390,000 (mPa · s) vinyl acetate content 32%)
E-3: ACLIFT CM5021 (manufactured by Sumitomo Chemical Co., Ltd., ethylene-methyl methacrylate copolymer, MFR 450 g / 10 min, melt viscosity at 150 ° C .: 62,500 (mPa · s), methyl methacrylate content 28%)
E-4: Petrocene 212 (manufactured by Tosoh Corporation, low density polyethylene, MFR 13 g / 10 minutes, melt viscosity at 150 ° C .: 2,600,000 (mPa · s))
E-5: FL02A (manufactured by Nippon Polypro, random polypropylene, MFR 20 g / 10 min, melt viscosity at 150 ° C .: 2,100,000 (mPa · s))
E-6: H0103 (manufactured by PS Japan, high impact polystyrene, MFR 2.6 g / 10 min, melt viscosity at 150 ° C .: not measurable)
E-7: Ultrasen 722 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer, MFR 400 g / 10 min, melt viscosity at 150 ° C .: 76,000 (mPa · s), vinyl acetate content 28%)
E-8: Ultracene 735 (manufactured by Tosoh Corporation, ethylene-vinyl acetate copolymer, melt viscosity at 150 ° C .: 26,000 (mPa · s), MFR 1,000 g / 10 min, vinyl acetate content 28%)
In addition, all said MFR is a value in 190 degreeC and a 2.16kg load.
The melt viscosity at 150 ° C. is a value determined by the same method as that for the pressure-sensitive adhesive, adhesive, styrene elastomer (A) and the like described above.

  Antioxidant: Irganox 1010 (manufactured by Ciba Japan, antioxidant, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate)

Claims (7)

A substrate (X);
An adhesive layer (Y) formed on at least a part of the substrate (X);
On the pressure-sensitive adhesive layer (Y) and comprising an adhesive layer (Z) formed on the surface layer,
The pressure-sensitive adhesive layer (Y) has tack at 25 ° C., and is formed of a hot-melt pressure-sensitive adhesive.
The adhesive layer (Z) is a resealable sealing sheet having no tack at 25 ° C. and formed of a hot melt adhesive.   The resealable sealing sheet according to claim 1, wherein the hot melt adhesive and the hot melt adhesive have a melt viscosity at 150 ° C. of 100 to 100,000 (mPa · s). The hot melt pressure-sensitive adhesive contains a styrene elastomer (A), mineral oil (B), and a tackifier resin (C1).
The hot melt adhesive includes a wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifier resin (C2),
The resealable sealing sheet according to claim 1 or 2, wherein the tackifying resin (C1) and the tackifying resin (C2) are the same or different resins. The hot melt pressure-sensitive adhesive contains a styrene elastomer (A), mineral oil (B), and a tackifier resin (C1).
The hot melt adhesive includes a wax (D), an ethylene-unsaturated ester copolymer (E), and a tackifier resin (C2),
The tackifying resin (C1) and the tackifying resin (C2) are the same or different resins,
When the total of the styrene elastomer (A), the mineral oil (B), and the tackifying resin (C1) of the hot melt adhesive is 100% by weight, the styrene elastomer (A) is 5 to 60. % By weight, 10 to 70% by weight of the mineral oil (B), and 10 to 70% by weight of the tackifying resin (C1),
When the total of the wax (D), the ethylene-unsaturated ester copolymer (E), and the tackifier resin (C2) of the hot melt adhesive is 100% by weight, the wax (D) is 5 The content of -50% by weight, 20-80% by weight of the ethylene-unsaturated ester copolymer (E), and 10-60% by weight of the tackifier resin (C2). The resealable sealing sheet as described.   The resealable packaging container provided with the resealable sealing sheet and container main body of any one of Claims 1-4.   The manufacturing method of the resealable packaging container including the process of heat-pressing the resealable sealing sheet of any one of Claims 1-4 to the opening part of a container main body. Step (1) of obtaining a pressure-sensitive adhesive layer (Y) having a tack at 25 ° C. by applying a hot melt pressure-sensitive adhesive on the substrate (X),
Resealable sealing comprising the step (2) of obtaining an adhesive layer (Z) having no tack at 25 ° C. by applying a hot melt adhesive on the pressure-sensitive adhesive layer (Y) having a tack at 25 ° C. Stop sheet manufacturing method.