JP2019055807A - Heat insulation double container - Google Patents

Abstract

To provide a heat insulation double container which never reduces functions even if being used in a situation exposed in a high temperature compared with a conventional situation such as microwave oven cooking.SOLUTION: In a heat insulation double container which compares a cup-type inner container that consists of a cylindrical cup drum member and a bottom member that seals a bottom of the cylindrical cup drum member, and an exterior sleeve which covers the drum member so as to form a heat insulation space between an outer face of the cup drum member of the cup-type inner container and the exterior sleeve, the cup drum member and the bottom member are constituted by at least a layered body 10 where a base material layer 11 made of paper, an adhesive layer 12, a barrier layer 13, and a seal layer 14 are layered, and the adhesive layer is made of a resin composition that includes one or more compounds selected from a group that consists of an epoxy radical included compound, a silane radical included compound, a carboxylic acid radical included compound, and an acid anhydride included compound.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insulated double container.

  In order to fill and package various liquid foods and drinks such as alcoholic beverages, fruit juices, soft drinks, dairy beverages, liquid seasonings, etc., so-called paper cups having various forms have been developed and proposed. For example, an insulated double container in which the body portion of the paper cup is provided with a double structure so as to be easily held even when the contents are high temperature has been developed and proposed (see, for example, Patent Document 1).

  In recent years, there has been an increasing need to heat and cook the contents packaged in such a heat insulating double container together with the heat insulating double container in a microwave oven.

JP 2003-127718 A

  Although the current insulated double container is manufactured assuming that the contents are hot, it is not assumed that it will be used for cooking in a microwave oven. When cooking with a microwave oven, in some cases, the adhesive layer constituting the heat-insulated double container may deteriorate due to heat, and the original function may not be performed, such as a decrease in adhesiveness or a decrease in barrier properties. It was.

  In addition, when a heat-insulated double container containing contents containing an oil component is cooked in a microwave oven, heat is applied locally, and the layers constituting the heat-insulated double container, such as a seal layer and a barrier layer, are melted to pinhole There was also a risk of occurrence.

  The present invention has been made in such a situation, for example, to provide an insulated double container that does not deteriorate in function even when used in a situation where it is exposed to a higher temperature than before, such as microwave cooking. Let it be the main issue.

  The present invention for solving the above problems includes a cup-shaped inner container comprising a cylindrical cup body member and a bottom member for sealing the bottom of the cylindrical cup body member, and the cup of the cup-shaped inner container. An exterior sleeve that covers the body member so as to form a heat insulation space between the outer surface of the body member, and the cup body member and the bottom member are both made of paper. The base material layer, the adhesive layer, the barrier layer, and the sealing layer are laminated, and the adhesive layer includes an epoxy group-containing compound, a silane group-containing compound, a carboxylic acid group-containing compound, and It is a resin composition containing 1 or 2 or more selected from the group which consists of an acid anhydride containing compound.

  In the above invention, the adhesive layer may have a thickness of 15 μm to 50 μm.

  Moreover, in said invention, the said barrier layer may laminate | stack the inorganic oxide vapor deposition film or the metal vapor deposition film on one side of the resin film.

  In the above invention, the density of the seal layer in one or both of the laminate constituting the cup body member and the laminate constituting the bottom member is 0.900 or more and 0.925 or less. The melt index is 1.0 or more and 20.0 or less, and it may contain an ethylene-α / olefin copolymer resin polymerized using a single site catalyst.

  In the above invention, a bonding layer may be provided between the barrier layer and the seal layer.

  Moreover, in said invention, it is preferable that melting | fusing point of the said adhesive bond layer is higher than melting | fusing point of the said sealing layer.

  According to the heat insulating double container of the present invention, since an adhesive layer made of a resin composition containing a predetermined compound is used, even when exposed to a higher temperature than conventional, such as microwave cooking, The original function is not deteriorated and the generation of pinholes can be suppressed.

It is a schematic sectional drawing which shows the layer structure of the laminated body which comprises the cup trunk | drum member and bottom member of the cup type inner container of the heat insulation double container concerning embodiment of this invention. It is a schematic sectional drawing which shows the structure of the heat insulation double container concerning embodiment of this invention.

  Hereinafter, the heat insulation double container concerning embodiment of this invention is demonstrated in detail using drawings.

(Laminate)
A heat insulating double container according to an embodiment of the present invention includes a cup-shaped inner container composed of a cylindrical cup body member and a bottom member that seals the bottom of the cylindrical cup body member, and the cup-shaped inner container An exterior sleeve that covers the body member so as to form a heat insulation space between the cup body member and the outer surface of the cup body member. And both the cup trunk | drum member and the bottom member are comprised by the laminated body which laminated | stacked at least the base material layer comprised from paper, the adhesive bond layer, the barrier layer, and the sealing layer. Below, the laminated body which comprises the cup trunk | drum member and bottom member of a cup type inner container is demonstrated first.

  FIG. 1 is a schematic cross-sectional view showing a layer structure of a laminate that constitutes a cup body member and a bottom member of a cup-shaped inner container of a heat-insulated double container according to an embodiment of the present invention.

  As shown in FIG. 1, the laminate 10 constituting the cup body member and the bottom member has at least a base material layer 11 made of paper, an adhesive layer 12, a barrier layer 13, and a seal layer 14 laminated in this order. Being done.

  In this specification, when the cup-type inner container is formed using the laminate 10, the side located outside the cup-type inner container is referred to as the “outer surface side”, and the cup-type inner container is located inside the cup-type inner container. The side to perform is referred to as the “inner surface side”. In FIG. 1, the upper side is the “outer surface side”, and the lower side is the “inner surface side”.

  Below, each layer which comprises the laminated body 10 is demonstrated.

-Base material layer The base material layer 11 is comprised from the paper. Since this paper becomes a basic material constituting the heat insulating container, it is possible to use paper having formability, bending resistance, rigidity, waist, strength and the like. As paper, for example, it is a main strength material, and uses various types of paper base materials such as high-size bleached or unbleached paper base, or pure white roll paper, kraft paper, paperboard, processed paper, milk base paper, etc. can do. The base material layer 11 may be a stack of a plurality of these papers. The paper has a basis weight of about 80 to 600 g / m ² , preferably about 100 to 450 g / m ² , and has a thickness of about 110 to 860 μm, preferably about 140 to 640 μm. .

-Adhesive layer In the heat insulation double container concerning embodiment of this invention, the adhesive bond layer 12 which comprises the laminated body 10 is an epoxy group containing compound, a silane group containing compound, a carboxylic acid group containing compound, and an acid anhydride. It is characterized by being a resin composition containing 1 or 2 or more selected from the group consisting of containing compounds.

  By using as the adhesive layer 12, a resin composition containing one or more selected from the group consisting of an epoxy group-containing compound, a silane group-containing compound, a carboxylic acid group-containing compound, and an acid anhydride-containing compound will be described later. The adhesive strength with the barrier layer 13 can be improved. As a result, even when exposed to a high temperature such as microwave cooking, wrinkles are generated in the base material layer 11 and the barrier layer 13 described later, It can suppress that peeling arises.

  The resin constituting the adhesive layer 12 is not particularly limited and is selected from the group consisting of an epoxy group-containing compound, a silane group-containing compound, a carboxylic acid group-containing compound, and an acid anhydride-containing compound. However, for example, a polyethylene resin or a polypropylene resin may be used.

When a polyethylene resin is used as the resin constituting the adhesive layer 12, the density is preferably in the range of 920 to 970 kg / m ³ and more preferably in the range of 920 to 965 kg / m ³ because of excellent heat insulation. . By setting the density of the resin constituting the adhesive layer 12 within the above range, even when the resin layer is overheated by a microwave oven or the like, pinholes can be effectively generated and the barrier layer 13 can be peeled off and wrinkled. Can be suppressed. Moreover, generation | occurrence | production of the thermal pinhole at the time of container shaping | molding can also be suppressed. The melting point of the resin constituting the adhesive layer 12 is desirably higher than the melting point of the seal layer described later. For example, when exposed to a high temperature such as cooking in a microwave oven, wrinkles and peeling may occur between the barrier layer 13 described later, and therefore the melting point is preferably 100 ° C. or higher, and 110 ° C. or higher. More preferably, 120 ° C. or higher is particularly preferable.

  The resin constituting the adhesive layer 12 is preferably a polyethylene resin in view of the adhesiveness with the base material layer 11 and the barrier layer 13. Examples of such polyethylene resins include ethylene homopolymers, ethylene / α-olefin copolymers, and compositions thereof. The molecular chain may be linear and has a length of 6 or more carbon atoms. It may have chain branching.

  Examples of the ethylene homopolymer include medium / low pressure ethylene homopolymer, high pressure low density polyethylene, and the like. The medium / low pressure ethylene homopolymer can be obtained by a conventionally known medium / low pressure ion polymerization method. The high pressure method low density polyethylene can be obtained by a conventionally known high pressure radical polymerization method.

  Examples of the α-olefin used in the ethylene / α-olefin copolymer include propylene, 1-butene, 4-methyl-1-pentene, 3-methyl-1-butene, 1-pentene, 1-hexene and 1-heptene. 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene and the like, and one or more of these may be used. The method for obtaining the ethylene / α-olefin copolymer is not particularly limited, and examples thereof include a high / medium / low pressure ion polymerization method using a Ziegler-Natta catalyst, a Phillips catalyst, or a single-site catalyst. it can. Such a copolymer can be conveniently selected from commercially available products.

  Examples of the epoxy group-containing compound contained in the resin constituting the adhesive layer 12 include epoxidized vegetable oil (epoxidation of unsaturated double bond of natural vegetable oil), glycidyl ether type, glycidyl amine type, glycidyl ester type, and the like. Can be mentioned. Among these, epoxidized vegetable oil is more preferable from the viewpoint of safety when used in food packaging materials. For example, epoxidized soybean oil, epoxidized linseed oil, epoxidized olive oil, epoxidized safflower oil, epoxidized corn oil and the like are used. Content of such an epoxy group containing compound is 0.01-10 weight part with respect to 100 weight part of resin which comprises the adhesive bond layer 12, for example, and 0.01-5.0 weight part is preferable. If it is less than 0.01 part by weight, the adhesive strength with the barrier layer 13 is insufficient, and if it exceeds 10 parts by weight, it is not preferred because it is accompanied by odor when used for blocking or food packaging.

  As the silane group-containing compound contained in the resin constituting the adhesive layer 12, a silane oligomer is preferably used. More specifically, in order to improve adhesiveness, any of an epoxy group, a mercapto group and an alkoxy group in the molecule, or a silane oligomer containing several of these is desirable. The silane oligomer is blended in an amount of 0.01 to 10 parts by weight, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the resin constituting the adhesive layer 12. When the blending amount of the silane oligomer is less than 0.01 parts by weight, the adhesive strength with the barrier layer 13 becomes insufficient, and when it exceeds 10 parts by weight, the molding process is inferior, which is not preferable.

  As the carboxylic acid group-containing compound contained in the resin constituting the adhesive layer 12, an ethylene-unsaturated carboxylic acid or a copolymer with an esterified product thereof can be used. More specifically, an ethylene-acrylic acid copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-methacrylic acid copolymer, and an ethylene-methyl methacrylate copolymer are exemplified. Further, an ionomer resin in which molecules of ethylene-unsaturated carboxylic acid are cross-linked with metal ions can be used.

  The acid anhydride-containing compound contained in the resin constituting the adhesive layer 12 is preferably a maleic acid-modified polyolefin resin such as a maleic acid-modified polyethylene resin or a maleic acid-modified polypropylene resin. Maleic anhydride-modified polyolefin resins such as maleic resins and maleic anhydride-modified polypropylene resins are more preferable. The maleic acid-modified polyolefin resin is obtained by graft polymerization of maleic acid to a polyolefin resin.

  Moreover, although it does not specifically limit about the thickness of the adhesive bond layer 12, It is preferable that they are 15 micrometers or more and 50 micrometers or less. By making the thickness of the adhesive layer 12 within the above-mentioned range, it is effective to generate hot pinholes during container molding or to generate pinholes and wrinkles even when overheated by a microwave oven, etc. Can be suppressed. In addition, when the thickness exceeds 50 μm, the entire laminate is hardened, which may cause molding defects.

  The resin constituting the adhesive layer 12 is generally used for polyolefin resins such as antioxidants, light stabilizers, antistatic agents, lubricants, antiblocking agents, etc., as necessary, in addition to the above-mentioned various compounds. Additives may be added as long as the object of the present invention is not impaired.

  The method for forming the adhesive layer 12 is not particularly limited, and for example, extrusion coating, laminate of a film prepared in advance, dry lamination, or the like can be used.

Barrier layer The laminate 10 constituting the cup body member and the bottom member is provided with a barrier layer 13 on the inner surface side of the adhesive layer 12. By providing the barrier layer 13, high airtightness can be imparted to the cup body member and the bottom member.

  The barrier layer 13 is not particularly limited as long as it can block a gas such as oxygen. For example, as shown in FIG. 1, an inorganic oxide is formed on one surface of the resin film 13a. It is preferable that the product vapor deposition film 13b or the metal vapor deposition film 13b is laminated.

  Examples of the resin film 13a constituting the barrier layer 13 include films made of polyester, polyamide, polypropylene, polyethylene terephthalate, stretched nylon, and the like. These include ethylene-vinyl alcohol copolymer, polyamide, and polyvinylidene chloride. Further, a layer formed of a resin exhibiting gas barrier properties such as polyacrylonitrile may be laminated. In addition, as the thickness, it is preferable that it is about 6-25 micrometers, for example.

  On the other hand, examples of the inorganic oxide vapor deposition film 13b constituting the barrier layer 13 include films made of silicon oxide, aluminum oxide, magnesium oxide, and the like.

  Moreover, as the metal vapor deposition film 13b which comprises the barrier layer 13, an aluminum vapor deposition film etc. can be mentioned, for example.

  The thickness of such a barrier layer is not particularly limited, but is preferably about 6 to 200 μm as a whole, and more preferably about 9 to 100 μm.

  In FIG. 1, the resin film 13a constituting the barrier layer 13 is located on the outer surface side, and the inorganic oxide vapor deposition film 13b and the metal vapor deposition film 13b constituting the barrier layer 13 are located on the inner surface side. The present invention is not limited to this, and conversely, that is, the resin film 13a may be located on the inner surface side, and the inorganic oxide vapor deposition film 13b or the metal vapor deposition film 13b may be located on the outer surface side.

-Seal layer In the laminated body 10 which comprises a cup trunk | drum member and a bottom member, the seal layer 14 is provided in the inner surface side of the barrier layer 13. FIG.

  The seal layer 14 forms a cup body member and a bottom member using the laminate 10, and further heat seals a predetermined portion when forming a cup-type inner container using the cup body member and the bottom member. This is a necessary layer. Various conventionally known sealing layers 14 can be used. Specifically, for example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, ethylene-α / olefin copolymer polymerized using a single site catalyst, polypropylene , Ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer An acid-modified polyolefin resin obtained by modifying a polyolefin resin such as a polymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid or itaconic acid. , Polyvinyl acetate Fat, poly (meth) acrylic resin, polyvinyl chloride resin, the resin of the other, or the like can be used, these may be used singly or may be used in combination of two or more.

  Among these, from the viewpoint of sealing properties, low-density polyethylene, medium-density polyethylene, linear (linear) low-density polyethylene, and ethylene-α / olefin copolymers polymerized using a single-site catalyst are more preferred. preferable. Among these, an ethylene-α / olefin copolymer polymerized using a single-site catalyst having excellent low temperature sealing properties and hot tack properties is more preferable.

The physical properties of the ethylene-α / olefin copolymer polymerized using a single-site catalyst that can be suitably used in the present invention has a density in the range of 0.900 to 0.925 g / cm ³ , preferably 0.8. The thing of the range of 905-0.915g / cm < ³ > is used. When the density is less than 0.900 g / cm ³ , the slipperiness is poor and paper jam occurs with a feeder or the like, and in the process of punching into a blank shape, the cutting ability is poor, and the processability in each process is poor. Therefore, it is not preferable. On the other hand, when the density exceeds 0.925 g / cm ³ , the low-temperature sealing property is deteriorated, which is not preferable. The melt flow rate (MFR) is preferably in the range of 1.0 to 20 g / 10 minutes. When the melt flow rate (MFR) is less than 1.0, the resin has poor fluidity. For example, when the cup is formed into a cup shape, the resin does not fill the wrinkle step portion generated in the squeezed bottom member and seals. Omission occurs. Further, when the melt flow rate (MFR) exceeds 20.0, the fluidity of the resin becomes high, and it is not possible to stay at the stepped portion of the wrinkle of the bottom member, and similarly, the omission of the seal occurs. Moreover, since hot tack property is also inferior, it is not preferable.

  Furthermore, in the seal layer 14 in the present embodiment, one or more of the above resins are used, melt-extruded using an extruder or the like, for example, via an anchor coating agent layer, By melt-extrusion laminating a melt-extruded resin layer together with the bonding layer 17 or using one or more of the above-mentioned resins, a resin film or sheet is produced in advance, and the resin film or The sheet may be sandwich-laminated using a melt-extruded resin as the bonding layer 17. In order to prevent the occurrence of cracks or the like in the inorganic oxide vapor-deposited film, one or more of the above-described resins are used, and a resin film or sheet is produced in advance from this, as the bonding layer 17. More preferably, dry lamination is performed through an adhesive layer for laminating.

  The melt-extruded resin of the bonding layer 17 includes the above-described low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, and ethylene-α polymerized using a single site catalyst.・ Olefin copolymer, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer Polymers, ethylene-propylene copolymers, methylpentene polymers, polybutene polymers, polyolefin resins such as polyethylene or polypropylene, and unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid Modified acid modified polyolefin Resins, polyvinyl acetate resins, poly (meth) can be used an acrylic resin other like resins.

  Moreover, as thickness of such a bonding layer 17, 15 micrometers-40 micrometers are desirable. If the thickness is less than 15 μm, the laminate strength tends to decrease, and if it exceeds 40 μm, the entire layer becomes hard and the moldability is inferior.

  On the other hand, as the adhesive for laminating the bonding layer 17, for example, one- or two-component cured or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, etc. Any dry laminating adhesive such as an epoxy type, a rubber type, a solvent type, an aqueous type, or an emulsion type can be used. Examples of the coating method for the dry laminating adhesive include a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a fountain method, and a transfer roll coating method. It can apply | coat to bonding surfaces, such as an adhesive film and a sealant film.

The coating amount is preferably 0.1 to 10 g / m ² (dry state), more preferably 1 to 5 g / m ² (dry state). If it is thinner than this, sufficient adhesive strength cannot be obtained,
If it is too thick, there is a concern of residual solvent.

  The seal layer 14 is not limited to a single layer or co-push specification.

  The thickness of the seal layer is desirably about 10 to 100 μm, preferably 10 to 60 μm. When the thickness is less than 10 μm, the resin cannot be buried in the wrinkle portion generated when the paper is squeezed, and a sealing failure occurs, which is not preferable. On the other hand, when the thickness exceeds 100 μm, it is not preferable because cracks occur in the vapor deposition layer due to heat at the time of extrusion and the barrier falls, or the whole layer becomes hard and the moldability is inferior.

-Other layers In the laminated body 10 which comprises a cup trunk | drum member and a bottom member, the layer which exhibits various functions other than each layer mentioned above may be contained. For example, it is preferable that the bonding layer 17 described above is included.

(Insulated double container)
Below, the heat insulation double container concerning embodiment of this invention using the laminated body 10 demonstrated above is demonstrated.

  FIG. 2 is a schematic cross-sectional view showing the configuration of the heat insulating double container according to the embodiment of the present invention.

  As shown in FIG. 2, the heat insulating double container 100 according to the embodiment of the present invention includes a cup body member 21 composed of the laminated body 10 described above and a bottom member 22 composed of the laminated body 10. And the outer sleeve 30 that covers the outside of the cup barrel member 21, and a heat insulating space 40 is formed between the cup barrel member 21 and the outer sleeve 30.

  The heat insulation double container 100 shown in FIG. 2 is an example to the last, and is not limited to this shape. That is, the heat insulating double container 100 shown in FIG. 2 has the outer winding opening edge 23 in which the periphery of the opening of the body member 21 is curled outward, but this may not be necessary. Other shapes may be used. Moreover, in the heat insulation double container 100 shown in FIG. 2, it has the inner winding opening edge part 31 which curled the edge of the bottom side in the exterior sleeve 30 inside, but this may not exist, Other shapes may also be used. Furthermore, the method for fixing the outer sleeve 30 to the in-cup container 20 is not limited, and a method other than the method shown in FIG. 2 may be used. Moreover, although the foot part 50 is provided in the bottom side in the heat insulation double container 100 shown in FIG. 2, what is called a flat bottom type heat insulation double container without the said foot part 50 may be sufficient.

  Moreover, it does not specifically limit about the manufacturing method of the heat insulation double container concerning embodiment of this invention, It can select suitably from a conventionally well-known manufacturing method.

The exterior sleeve 30 constituting such a heat insulating double container 100 is not particularly limited, and a conventionally known one can be used. As a material of the exterior sleeve 30, for example, cardboard having a basis weight of 150 to 450 g / m ² , cardboard such as coated cardboard can be used. When the basis weight is less than 150 g / m ² , the rigidity becomes too low, and particularly when the heat is high, the bending becomes too large to obtain a sufficient heat insulating effect, and when it exceeds 450 g / m ² , the rigidity becomes high. This is not preferable because the workability is lowered and the material cost is increased. Further, a printing layer may be provided on the outer sleeve 30 as appropriate. The print layer is not particularly limited, and various conventionally known print layers can be appropriately selected.

Example 1
As a barrier layer, a base material layer composed of a silica vapor-deposited film in which a silica vapor-deposited film was formed on one surface of a PET film and paper was prepared.

  Next, while corona treatment is performed on one surface of the base material layer, EMAA (AN4214C, density: 0.930, melting point: 105 ° C.) as an adhesive layer is extruded by 30 μm, and on the silica deposition surface side of the barrier layer Sandwich lamination was performed while performing inline corona treatment.

  Next, a two-component curable ester anchor coating agent (Takelac (registered trademark) A3210 / Takenate (registered trademark) A3075) manufactured by Takeda Pharmaceutical Co., Ltd.) was applied to the PET film side of the barrier layer with a gravure coater, An anchor coat layer was formed by drying through a drying furnace.

  Subsequently, ethylene-α ·· polymerized using the low density polyethylene resin (density: 0.923, melt index (M.I): 3.7, melting point: 111 ° C.) and a single-site catalyst on the anchor coat layer. Using an olefin copolymer resin (density: 0.906, melt index (M.I): 13.0, melting point: 103 ° C.) and coextruding these, a bonding layer of 20 μm made of a low density polyethylene resin and Then, a 20 [mu] m seal layer made of an ethylene- [alpha] -olefin copolymer resin polymerized using a single site catalyst was formed to produce a laminate used for the body member and the bottom member.

  Next, a cylindrical cup barrel member and a bottom member that closes the lower end of the cup barrel member are formed using the laminate, and the lower end portion of the cup barrel member is bent inward to form a peripheral portion of the bottom member. The cup contents are joined so as to cover the outer surface of the bottom member, and a plurality of concave surface portions and convex surface portions are alternately formed in the joint portion covering the outer surface of the bottom member, and at least the convex surface portions are at the same height position. A vessel was manufactured.

  On the other hand, an exterior paper on which predetermined printing was performed was prepared, and this was punched into a fan to obtain an exterior sleeve.

  A lower edge peripheral end of the outer sleeve is folded inward to form a folded portion, and the cup inner container is fitted into the outer sleeve from the bottom, and the upper edge peripheral end of the outer sleeve is the upper edge of the cup inner container. It entered into the gap inside the curled portion at the peripheral edge, and the folded portion at the peripheral edge of the lower edge was placed along the outer surface of the lower end portion of the trunk portion. And the heat insulation double container concerning Example 1 of this invention was obtained by fixing the lower end part of an exterior sleeve, and the trunk | drum of the container in a cup with an adhesive agent.

(Example 2)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, except that the acid anhydride-containing compound resin (density: 0.900, melting point: 120 ° C.) was extruded by 20 μm, other The heat insulation double container concerning Example 2 was obtained in the same manner as Example 1 in all the conditions.

(Example 3)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, other conditions, etc. except that the ionomer resin (density: 0.960, melting point: 126 ° C.) was extruded by 20 μm. Were obtained in the same manner as in Example 1 to obtain an insulated double container according to Example 3.

Example 4
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, except that 20 μm of silane oligomer-containing medium density polyethylene resin (density: 0.933, melting point: 126 ° C.) was extruded, All other conditions were the same as in Example 1, and an insulated double container according to Example 4 was obtained.

(Example 5)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, except that the silane oligomer-containing medium density polyethylene resin (density: 0.940, melting point: 126 ° C.) was extruded by 10 μm, All other conditions were the same as in Example 1, and an insulated double container according to Example 5 was obtained.

(Example 6)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, except that the silane oligomer-containing low density polyethylene resin (density: 0.918, melting point: 103 ° C.) was extruded by 30 μm, All other conditions were the same as in Example 1, and an insulated double container according to Example 6 was obtained.

(Example 7)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, a silane oligomer-containing medium density polyethylene resin (density: 0.933, melting point: 126 ° C.) was extruded by 30 μm and low Density polyethylene resin (Density: 0.923, Melt index (MI): 3.7, Melting point: 111 ° C.) A sealing layer of 40 μm formed of a single layer is formed, and a laminate used for a body member and a bottom member is formed. A heat insulated double container according to Example 7 was obtained in the same manner as Example 1 except that it was manufactured.

(Example 8)
As a barrier layer, a two-component curable urethane is formed by making a silica vapor deposition surface of a silica vapor deposition film having a silica vapor deposition film formed on one surface of a PET film face a polyethylene film B25μ (density: 0.923, melting point: 111 ° C.). Dry lamination was carried out using a system adhesive. Further, a polyethylene film A25μ (density: 0.930, melting point: 123 ° C.) is made to face the PET surface side of the silica vapor-deposited film, and dry lamination is similarly performed using a two-component curable urethane adhesive. A laminate of A / silica vapor deposited PET / polyethylene film B was obtained.

  Next, while subjecting one side of the paper constituting the base material layer to corona treatment, 15 μm of silane oligomer-containing medium density polyethylene resin (density: 0.933, melting point: 126 ° C.) as an adhesive layer was extruded, and the above Sandwich lamination was performed with the barrier layer facing the polyethylene film A side.

  Next, from an ethylene-α-olefin copolymer resin (density: 0.906, melt index (M.I): 13.0, melting point: 103 ° C.) polymerized on the polyethylene film B side using a single site catalyst. The heat insulating double container according to Example 8 was prepared in the same manner as in Example 1 except that a sealing layer of 20 μm was formed and a laminate used for the body member and the bottom member was manufactured. Obtained.

(Comparative Example 1)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, an ethylene-α / olefin copolymer resin polymerized using a single site catalyst (density: 0.888, melt index) A heat insulating double container according to Comparative Example 1 was obtained in the same manner as in Example 1 except that (M.I): 20.0, melting point: 101 ° C.) was extruded by 30 μm.

(Comparative Example 2)
In forming the adhesive layer of the laminate in the heat insulating double container according to Example 1, an ethylene-α / olefin copolymer resin polymerized using a single site catalyst (density: 0.920, melt index) Except that (M.I): 10.5, melting point: 109 ° C.) was extruded by 30 μm, all other conditions were the same as in Example 1 to obtain an insulated double container according to Comparative Example 2.

(Evaluation of appearance of inner surface of container and evaluation of pinhole generation)
In each of the heat insulation double containers of Examples 1 to 8 and Comparative Examples 1 and 2, the chicken was fried and heated at 600 W for 3 minutes in the microwave, and then the inner surface of each heat insulation double container. Appearance evaluation and pinhole generation were evaluated according to the following criteria.

(Appearance evaluation of inner surface of container)
The presence or absence of wrinkling and bubbling on the inner surface of the container was visually confirmed and evaluated according to the following criteria.
A: No wrinkles and good appearance B: Small wrinkles less than 5 mm occur C: Large wrinkles greater than 5 mm occur

(Evaluation of pinhole generation)
10 heat-insulated double containers according to Examples 1 to 8 and Comparative Examples 1 and 2 were prepared, and after warming in a microwave oven, the permeate was poured and the number of containers in which leakage from pinholes occurred I counted.

  The evaluation results are shown in Table 1 below.

  As is clear from Table 1 above, according to the heat insulating double container according to the embodiment of the present invention, even when exposed to a high temperature by a microwave oven or the like, generation of wrinkles, bubbling, and even pinholes occurs. Can be suppressed.

DESCRIPTION OF SYMBOLS 10 ... Laminated body 11 ... Base material layer 12 ... Adhesive layer 13 ... Barrier layer 14 ... Seal layer 17 ... Bonding layer 20 ... Cup inner container 21 ... Cup trunk member 22 ... Bottom member 30 ... Outer sleeve 100 ... Insulation double container

Claims (6)

A cup-shaped inner container comprising a cylindrical cup body member and a bottom member for sealing the bottom of the cylindrical cup body member;
An outer sleeve that covers the barrel member so as to form a heat insulation space between the cup-type inner vessel and the outer surface of the cup barrel member;
Each of the cup body member and the bottom member is composed of a laminate in which at least a base material layer made of paper, an adhesive layer, a barrier layer, and a seal layer are laminated,
The adhesive layer is a resin composition including one or more selected from the group consisting of an epoxy group-containing compound, a silane group-containing compound, a carboxylic acid group-containing compound, and an acid anhydride-containing compound. Insulated double container.   2. The heat insulating double container according to claim 1, wherein the adhesive layer has a thickness of 15 μm or more and 50 μm or less.   The heat insulating double container according to claim 1 or 2, wherein the barrier layer is formed by laminating an inorganic oxide vapor deposition film or a metal vapor deposition film on one surface of a resin film.   The seal layer in one or both of the laminate constituting the cup body member and the laminate constituting the bottom member has a density of 0.900 or more and 0.925 or less, and a melt index of 1.0 or more. The heat-insulating double container according to any one of claims 1 to 3, comprising an ethylene-α-olefin copolymer resin that is 20.0 or less and polymerized using a single-site catalyst.   The heat insulating double container according to claim 4, wherein a bonding layer is provided between the barrier layer and the seal layer.   The heat insulating double container according to claim 4 or 5, wherein a melting point of the adhesive layer is higher than a melting point of the sealing layer.

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