JPH0230947B2 - KAIFUYOINAMITSUPUSEIKEIYOKI - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a hermetically-molded container that is easy to open, and more particularly, the present invention relates to a sealed and molded container that is easy to open, and more specifically, a seamless container body with a flange formed by drawing of a metal material and a lid that is resistant to sterilization and has a reliable seal. The present invention relates to a hermetically sealed molded container which can form a certain heat-sealed part and which can be easily opened by hand at the heat-sealed part. Conventional technology Conventionally, sealed containers, in which two opposing metal materials constituting the container are heat-sealed via a heat-sealable resin layer to form a sealed portion, are used for long-term storage of various foods. widely used for purposes. For example, in a container in which two sheets of metal foil with heat-sealing resin such as polyolefin film laminated on the inside surface are stacked together in a bag shape, and the periphery is heat-sealed, this sealed part is heated. Because they are resistant to sterilization and have excellent sealing reliability, they are widely used for the purposes mentioned above under the name retort pouches. On the other hand, a seamless container (hereinafter sometimes simply referred to as a seamless container with a flange), which consists of a bottom, a side wall, and a flange that are integrally formed by drawing a metal material, is used for frozen confectionery such as jelly, water yokan, and pudding. However, when applying the above-mentioned heat sealing structure to this type of container, many difficulties are still encountered. In other words, in the case of the retort pouch mentioned above, it is possible to have a considerably large area for the heat-sealed part, but in the case of the seamless container with a flange mentioned above, the heat-sealed area is ultimately limited to the flange part. Increasing the area of this flange will increase the amount of metal material used and worsen the appearance of the container.
This will result in restrictions such as a reduction in the number of products that can be packed into a box of a certain volume. Thus, in the case of a flanged seamless container, it is difficult to form a strong sealing structure with high sealing reliability. In addition, when filling the contents, droplets of the contents inevitably adhere to the flange mentioned above, and this contents become trapped in the heat-sealed interface as foreign matter, making the sealing reliability even lower. It's easy to become. In other words, in the case of the above-mentioned retort pouch, even if liquid or solid contents adhere to the sealed interface as foreign matter, the heat sealing width can be made sufficiently large, and both opposing inner surfaces can be heated. Because it is composed of a sealing resin and the laminated sheet to be heat-sealed is flexible and allows considerable deformation during heat-sealing, it is possible to completely envelop foreign matter at the interface to be sealed. However, in the case of a seamless container with a flange, the width of the heat-sealed part is narrow as mentioned above, the flange part is rigid so no deformation is allowed during heat-sealing, and Due to the difficulty of increasing the thickness of the adhesive resin layer sufficiently, it is difficult to embed foreign matter existing at the interface to be sealed with resin, and pinholes may be formed in the sealing area or pins may be removed during sterilization. This results in latent defects in the form of holes, resulting in poor sealing reliability. Furthermore, in this type of flanged seamless container, while a reliable seal is established between the container body flange and the lid, when unsealing, the heat-sealed surfaces of both can be easily peeled off by hand. In other words, it is desired that the packaging be easy to open (peelable). Conventionally, hot melt adhesives in heat sealants are generally satisfactory for the purpose of easy opening, but these hot melt adhesives contain low melting point components such as wax. In connection with this, it is difficult to ensure reliable sealing when hot filling the contents or sterilizing the sealed container after filling due to poor heat resistance. On the other hand, when heat-sealing similar heat-sealable resins such as polyethylene and polypropylene,
Although it is possible to achieve a reliable seal that can withstand the above heat treatment, in this case the heat seal strength is as high as, for example, 4000 g/1.5 cm or more, and it is extremely difficult to peel off the heat sealed interface by hand. becomes. For this reason, for example, as recognized in Japanese Patent Publication No. 46-35513 and Japanese Patent Publication No. 47-35876, various elastomers and olefin copolymers are added to one or both of the olefin polymer layers to be heat-sealed. By pre-blending, the peel strength at the sealing interface can be increased from 500 to 500, which is called easy-peel adhesion.
It is being adjusted to a range of 3000g/1.5cm. Problems to be Solved by the Invention However, when such a blend of olefinic polymers is used as a heat sealant for a lid, after the lid is peeled off, there is , a phenomenon in which feather-shaped heat sealant fragments remain, that is, feather linkage, occurs, giving the purchaser of the sealed package a sense of anxiety and discomfort that the contents or container may have been altered; There is also the problem of loss of product value. According to the present invention, a heat-sealed portion that is resistant to sterilization and has a high degree of sealing reliability is formed between the flanged seamless container and the lid, and peeling at this heat-sealed portion is caused by feathering, etc. A hermetic container is provided that is easily sealed without the need for. Means for Solving the Problems According to the present invention, there is provided a seamless container body consisting of a bottom portion, a side wall portion, and a flange portion integrally formed by drawing a metal material, and a flange portion of the container body and a sealing member. In a sealed container, the container body has a circumferential groove in its flange portion, an acid- or acid anhydride-modified olefin polymer filled in the groove, and a main constituent olefin unit. The lid is provided with a layer of a blend of one or more olefinic polymers different from that of the acid- or acid-anhydride-modified olefin-based polymer, and the lid has a blend layer on its inner surface in which the main constituent olefin units are the acid- or acid anhydride-modified olefin-based polymer. It is characterized in that it has an inner layer made of an olefinic polymer of the same type as that of the olefinic polymer, and the container body and the lid are sealed by heat fusion of the blend layer and the inner layer. An easily openable sealed container is provided. The present invention will be explained in detail based on the accompanying drawings. In FIGS. 1 and 2 showing the sealed container of the present invention, a container body 1 is formed by drawing a metal material, and includes a bottom portion 2, a side wall portion 3 continuous to the bottom portion, and a flange portion continuous to the upper end of the side wall portion. It consists of 4. These parts of the container body 1 are formed integrally and seamlessly, and are rigid or semi-rigid, and the space surrounded by the bottom part 2 and the side wall part 3 serves as a contents storage part 5. A lid 6 is provided so as to cover the opening of the container body 1 and engage the flange portion 4 at its peripheral portion. Heat sealing is performed via the blend layer of the composition and the inner surface layer of the lid. An important feature of the sealed container of the present invention is that a circumferential groove 7 is provided in the flange portion 4 of the container body, a blended resin 8 is filled in this groove 7, and this blended resin layer 8
And, the container body 1 and the lid 6 are heat-sealed via a specific inner surface layer 10 of the lid. Function First, by providing the circumferential groove 7 in the flange portion 4, it becomes possible to provide a heat-sealing blend resin layer 8 of sufficient thickness in this groove 7, and the width of the flange portion can be considerably reduced. Even when the width of the heat sealing surface is narrow, it is possible to form a sealed structure by strong heat sealing. Moreover, the sufficiently thick heat-sealing blend resin layer 8 provided in the groove 7 is
It also acts as a kind of cushion layer under the heating and pressurizing conditions when heat sealing the lid 6, and even if the flange part is rigid, the heat sealing operation is smooth and reliable over the entire circumference. Moreover, even if the contents adhere as foreign matter to the interface to be sealed, the foreign matter is completely embedded in the resin to completely prevent sealing defects such as pinholes from occurring. Furthermore, if the heat-sealing blend resin layer 8 is simply provided thickly on the flange portion, the resin melted under the pressurized conditions for heat sealing may protrude outside the sealing portion, causing poor sealing. However, according to the present invention, since the thermosealable blend resin layer 8 is accommodated in the groove, such defects can be eliminated very effectively. Furthermore, in the present invention, as the resin 8 filled in the groove 7, (A) an acid- or acid anhydride-modified olefin polymer, and (B) the main constituent olefin unit is the acid- or acid anhydride-modified olefin polymer. Using a blended product with one or more types of olefinic polymers different from the coalescence, and as the inner layer 10 of the lid body 6,
It is particularly important to use an olefin polymer whose main constituent olefin units are the same as those of the acid- or acid anhydride-modified olefin polymer described above in terms of the combination of sealing reliability and ease of opening, and the prevention of feathering. . That is, in the present invention, in order to form a heat-sealed part that has reliable sealing reliability and can withstand heat treatment such as heat sterilization or hot filling, it is necessary to Both the anhydride-modified olefin polymer and the olefin polymer constituting the inner surface layer of the lid have the same main constituent olefin monomer. In other words, it must be common. For example, when the inner layer 10 is a crystalline propylene polymer, the acid or acid anhydride-modified olefin polymer must also contain propylene as the main constituent olefin monomer; In the case of polyethylene, the main constituent olefin monomer of the modified olefin polymer must be ethylene. Furthermore, it is also important from the viewpoint of adhesion to the container flange that the heat-sealable resin filled in the groove 7 of the flange contains an acid or acid anhydride-modified olefin polymer. Furthermore, while performing heat sealing that can withstand heat treatment, we maintain the heat seal strength within the range of 500 to 3000 g/1.5 cm, which is called easy-open adhesion.
In order to prevent feathering when opening the package, acid or acid anhydride modified olefin polymer A
Therefore, it becomes important to blend one or more olefinic polymers B whose main constituent olefinic units are different from those of the polymer A. That is, when acid-modified olefin-based polymer A is a propylene-based polymer, an ethylene-based polymer is blended as polymer B, and when acid-modified olefin-based polymer A is an ethylene-based polymer, propylene is blended. Blend the system polymers. In the present invention, acid-modified olefin polymer A
The olefinic polymer B, which is different from the above, and which is mixed in the olefinic polymer B, has the effect of reducing the heat seal strength between the acid-modified olefinic polymer A and the inner layer made of the same kind of olefinic polymer to the above-mentioned range. do. Moreover, when the sealed portion heat-sealed via the blend layer 8 described above is to be opened by peeling off, generally the lid inner surface material 10 and the blend layer 8 are removed.
Clean peeling is achieved by cohesive failure of the blend layer at the interface between the two or in the vicinity thereof. In conventional heat-sealed structures, feathering occurs when the package is opened because the inner surface material of the lid undergoes cohesive failure at the heat-sealed part, and this cohesive failure does not stop at the end of the heat-sealed part in the peeling direction. It is recognized that this is because the cohesive failure progresses further and fluffy fragments remain in the heat-sealed area. In contrast, according to the present invention, as described above, cohesive failure of the lid inner surface material 10 is effectively prevented when peeled off, and the blend layer 8 itself also has a width that does not exceed the width of the flange portion 4. Since the groove is provided within the groove, the generation of raised debris, that is, feathering, can be effectively prevented. In the blend layer used in the present invention, acid or acid anhydride-modified olefin polymer A and olefin polymer B having different constituent olefin units from this are A:B=80:20 to 20: 80 In particular, it is desirable that they be present in a weight ratio of 75:25 to 30:70. That is, if the amount of polymer B is greater than the above range, problems such as poor adhesion to the flange and poor heat sealing with the lid tend to occur; If the amount is less than 1, it becomes difficult to form an easily peelable sealing interface, and furthermore, it tends to be difficult to prevent the occurrence of feathering. Preferred Embodiments of the Invention In the present invention, the width of the groove 7 provided in the flange portion 4 varies depending on the size of the container and the type of heat-sealing resin, but is generally in the range of 1.5 to 5 mm, particularly 2 to 3 mm. It is important to do this in order to increase the sealing reliability and to reduce the protruding width of the flange as much as possible. In addition, the thickness of the heat-sealing blend resin layer 8 should be 0.03 mm or more, particularly 0.05 mm or more, in order to completely embed foreign matter existing at the interface to be sealed and to perform strong and uniform sealing. From an economical point of view, it is best to set it to 2.0mm or less, especially 1.0mm.
It is better to set it to less than mm. Examples of the metal material for the flanged container body 1 include various surface-treated steel plates, such as tinplate, electrolytic chromic acid treated steel plates, etc., and light metals such as aluminum. These metal materials are stamped and press formed,
The mixture is subjected to drawing forming using a combination of a drawing punch and a drawing die to obtain a flanged seamless container having the shape shown in FIGS. 1 and 2. It is preferable for the shape of the container to be circular and the side wall portion to be tapered from the viewpoint of molding, but it is of course possible to have an oval shape, a rectangular shape, or the like. The thickness of the container body is
The range is preferably from 0.5 to 0.1 mm, and the aperture ratio defined as the ratio of bottom diameter/material diameter is desirably in the range from 0.3 to 0.8. In punching press processing, flanging and grooving are performed simultaneously with drawing, but flange processing and grooving may be performed separately from drawing by means known per se. The flanged container body described above can be used in an unpainted state, but from the viewpoint of corrosion resistance, it is desirable to provide a protective coating on the inner and/or outer surfaces. Paints, epoxy-urea paints, epoxy-melamine paints, styrenated epoxy ester paints, vinyl paints, acrylic paints, epoxy
Known can paints such as acrylic paints, melamine-acrylic paints, polyester paints, and epoxy-vinyl paints are used. Further, there is no problem in providing a heat-resistant resin such as polyethylene terephthalate on the outer surface. The modified olefin resin suitable for the purpose of the present invention has a carboxyl group or its anhydride of 1 to 600
Especially 10 to 300 mm equivalent (meq)/
Contains a concentration of 100g polymer and is produced by the following method. First, as the olefin resin to be used as the trunk or base, a known crystalline olefin resin that can be heat-sealed and preferably withstands retort sterilization, such as low, medium to high density polyethylene, isotactic resin, etc. polypropylene, polybutene-1,
Polyolefins such as 4-methylpentene-1 and crystalline ethylene-propylene copolymers are used. The molecular weight of the crystalline olefin resin may be sufficient as long as it can form a film, and the melt index MI is generally 0.05 to 100 g/10 min, particularly 0.1.
50g/10 minutes is preferably used. As the acid or its anhydride used for modification, the following can be used alone or in combination of two or more. A Ethylenically unsaturated carboxylic acid: acrylic acid, methacrylic acid, maleic acid,
Fumaric acid, crotonic acid, itaconic acid, citraconic acid, 5-norbornene-2,3-dicarboxylic acid. B Ethylenically unsaturated carboxylic anhydride: maleic anhydride, citraconic anhydride, 5-norbornene-2,3-dicarboxylic anhydride, tetrahydrophthalic anhydride. The modification treatment is performed by introducing the monomer into the main chain or side chain of the olefin resin by known means such as graft copolymerization and terminal treatment. For example, a modified olefin resin can be easily produced by bringing a backbone polymer consisting of an olefin resin into contact with an ethylenically unsaturated monomer containing an acid group in the presence of a radical initiator or radical initiation means. When the modified olefin polymer B is blended with the modified olefin polymer A, when the modified olefin polymer is modified polypropylene, low-, medium- or high-density polyethylene, ethylene-butene-1 copolymer, main constituent Ethylene-propylene copolymer or ethylene-propylene-butene-1 copolymer in which the olefin monomer is ethylene,
Examples include ethylene-vinyl acetate copolymer, ethylene-acrylic copolymer, ionically crosslinked ethylene copolymer (ionomer), and acid- or acid anhydride-modified polyethylene. When the modified olefin polymer is modified polyethylene, polypropylene, a propylene-ethylene copolymer whose main constituent olefin unit is propylene, and acid- or acid anhydride-modified polypropylene can be used. Blending of both polymers is preferably carried out by melt kneading, but dry blending or wet mixing using a dispersion medium can also sufficiently achieve the object of the present invention. According to the invention, the heat-sealing blend resin described above is applied in the form of a solution or dispersion into the groove of the flange of the container body. For example, fine particles of these blended resins can be dispersed in water or organic solvents, so they can be applied in the form of a dispersion into the groove of a flange. Of course, in order to adjust the viscosity of the dispersion,
Other resins soluble in the dispersion medium may be dissolved in advance. Furthermore, since the blend containing the modified olefin resin is soluble in decalin, hot toluene, hot xylene, etc., it can also be applied to the groove of the flange in the form of a solution. The concentration of the thermosealable blend resin in these solutions or dispersions is advantageously from 10 to 80% by weight, in particular from 30 to 60% by weight. The resin solution or dispersion applied in the grooves is dried to remove the solvent, and then heated to a temperature equal to or higher than its melting point to form a heat-sealable blended resin layer tightly adhered to the grooves. Instead of applying the blended resin in solution or dispersion form, electrostatic powder coating, melt spraying, melt extrusion,
Of course, the blended resin may also be applied in the form of a circumferential preform. Any flexible laminate including an inner surface material 10 made of an olefin polymer can be used as the lid 6. As the olefin polymer, for example, isotactic polypropylene, ethylene content of 15 mol% or less, especially 10 to 3
Crystalline propylene-based polymers such as mol% crystalline propylene-ethylene copolymers and low-, medium-, or high-density polyethylene are preferably used. The substrate on which this inner surface material is provided is aluminum foil,
Metal foils such as iron foil, tin foil, and steel foil; high-strength resin films such as biaxially oriented polyethylene terephthalate, biaxially oriented nylon film, and biaxially oriented polypropylene film, or laminates thereof are used. When the substrate is a metal foil, it is preferable to provide the above-mentioned high-strength film or organic coating film as a protective layer on the side opposite to the side on which the inner surface material is provided. In the specific example shown in FIG. 1, the lid 6 consists of a metal foil substrate 9, an olefinic polymer inner layer 10 applied to one surface thereof, and a protective layer 11 applied to the other surface. . In the present invention, from the viewpoint of hot filling, heat sterilization, etc., it is desirable that the inner surface material made of an olefin polymer is made of a crystalline propylene polymer.
Correspondingly, a modified olefin resin layer in which the main constituent olefin monomer is propylene is used. After filling the container body 1 with the contents hot or cold and replacing the atmosphere with water vapor, nitrogen, etc. as necessary, the lid body 6 is attached to the container body 1, and the flange side heat-sealing blend resin layer 8 and the lid are placed. The side film layers 10 are stacked so that they face each other, and heat sealing is performed by heating the flange portions under pressure. This heating temperature is higher than the melting point of the thermosealable blend resin layer 8, and the pressurization is generally performed under a pressure of 1 to 10 kg/cm ² gauge. This heat sealing operation can be easily performed using a heat sealing means known per se, such as a heat seal bar or high frequency induction heating. Effects of the Invention The heat-sealed part according to the present invention can withstand sterilization operations such as hot filling, boiling water sterilization, and retort sterilization, and has a high degree of sealing reliability. This provides the advantage that foods can be stored stably for a long period of time, and that the seal can be easily opened by peeling off the heat-sealed portion without feathering or the like. Examples The excellent effects of the present invention will be explained in the following examples. Example 1 Chromic acid treated steel plate TFS with printing on one side and modified vinyl paint on the other side
A circular blank with a diameter of 110 mm is punched out from the blank and press-formed to form a bottom part with a diameter of 50 mm, a tapered side wall part with a height of 30 mm, a diameter of 75 mm, a width of 6 mm,
A molded container main body as shown in the cross-sectional view of FIG. 1 was prepared, which consisted of a flange portion having a circumferential groove of 2.5 mm in width and 0.3 mm in depth. Next, the flange groove of the molded container body has a density of 0.90 g/cc, a melting point of 164°C, and a carbonyl group concentration.
180meq/100g polymer maleic anhydride modified polypropylene powder 50wt% and density 0.951g/
cc, aromatic solvent dispersion of 50wt% high-density polyethylene powder with a melting point of 132℃ (solid content 33wt%)
was applied through a nozzle to a width of 2.5 mm and a thickness of 250 μm. Next, the solvent was evaporated by passing through a baking oven maintained at 185°C for 4 minutes, and the maleic anhydride-modified polypropylene was bonded to the inner surface layer of the container, and a blend layer of maleic anhydride-modified polypropylene/polyethylene was placed in the flange groove. A molded container body was obtained. The container body thus obtained is filled with a water bottle, and a circular lid material with a diameter of 75 mm is made of polypropylene and has a tab portion consisting of a laminate material of 12μ biaxially oriented polyethylene terephthalate/50μ aluminum foil/70μ polypropylene. The layer was heat-sealed to the flange of the container body at a temperature of 250° C. and a pressure bonding time of 1 second so that the layer was on the inner surface. This was heated to 120℃ and 1.5Kg/cm ² in a retort pot.
Heat sterilized for 30 minutes. In this case, no leakage from the flange seal portion was observed. Next, as a sealing reliability test, 100 of the retort-sterilized molded containers were placed in a spore suspension (spore concentration: ¹⁰⁷ cells/ml) mainly consisting of spore bodies of the anaerobic spore-forming bacterium Clostridium pastorianum. After soaking for 24 hours, they were stored in a constant temperature warehouse at 30°C for 2 weeks, and the contents were checked for decomposition and the presence or absence of gas generation. As a result, the number of spoiled items and the number of gas-generating items were both zero. Furthermore, when the sealed container after retort sterilization was peeled off from the lid tab, it was easy to open. Moreover, no feathering was observed on the flange after peeling and opening, and the flange surface was in a uniform state. In addition, the seal strength between the flange and the lid was measured at six points around the entire circumference of the flange.
The maximum value was 1.6Kg/1.5cm, the minimum value was 1.4Kg/1.5cm, and the average value was 1.5Kg/1.5cm, and the adhesion was uniform. Examples 2 to 4 Using the container body materials shown in Table 1, a container with a bottom diameter of 50 mm and a tapered height, which is the same as in Example 1, was prepared.
A container was molded as shown in the cross-sectional view of FIG. 1, consisting of a side wall portion of 30 mm, a flange portion having a diameter of 75 mm, a width of 6 mm, and a circumferential groove having a width of 2.5 mm and a depth of 0.3 mm.
Next, a blend adhesive layer was formed on the flange portion using the resin material shown in Table 1 to produce a container body. Each of these container bodies was filled with the contents shown in Table 2, and each container had a tab portion consisting of a laminate of 12μ biaxially oriented polyethylene terephthalate/50μ aluminum foil/70μ polypropylene.
A 75 mm circular lid material was heat-sealed to the flange of the container body with the polypropylene layer on the inner surface at a temperature of 250° C. and a pressure bonding time of 1 second. These filled and sealed containers were then heat sterilized under the conditions shown in Table 2. In this case, no leakage of the contents from the flange seal was observed. Next, a sealing reliability test was conducted on 100 pieces of each in the same manner as in Example 1, and the number of spoiled items and the number of gas-generating items were both zero. In addition, the seal strength between the flange part and the lid material was measured at six points around the entire circumference of the flange, and the average value is shown in Table 2.
Shown below. Furthermore, when the lid tab of each retort-sterilized sealed melter was opened, peeling was easy, the peeled surface was uniform, and no feathering was observed.

【table】

[Table] Comparative Example 1 In Example 1, the container body was coated with only maleic anhydride-modified polypropylene at a thickness of 200 μm on the flange, and the sealing layer was
0.90g/cc, 50wt% polypropylene with melting point 164℃
It is made of a blend of 50wt% high-density polyethylene with a density of 0.951/cc and a melting point of 132℃, and has a tab part punched out of a laminate material of 12μ biaxially oriented polyethylene terephthalate/50μ aluminum foil/70μ two original blend layers. When a circular type with a diameter of 75 mm was used, there were no problems with retort resistance or sealing performance. However, when the container was opened from the tab section, although it was easy to open, threading, or feathering, occurred at the flange section of the main body of the container. Examples 5 to 7, Comparative Examples 2 to 4 Blend ratios of maleic anhydride modified polypropylene powder and high density polyethylene powder are shown in Table 3.
A container body was produced in the same manner as in Example 1 except for the changes shown in . This container body is filled with water yokan, and the composition is
12μ biaxially oriented polyethylene terephthalate/50μ
A circular lid material with a diameter of 75 mm and a tab made of aluminum foil/70μ polypropylene laminate was heat-sealed to the flange of the container body under heat sealing conditions at a temperature of 250° C. and a crimping time of 1 second. This was heated to 120℃ and 1.5Kg/cm ² in a retort pot.
Heat sterilized for 30 minutes. In Examples 5 and 6, there was no problem with retort resistance and sealing performance, and the seal strength measured at six points around the entire circumference of the flange was an average of 2.9 Kg/15 mm and 2.4 Kg/15 mm, respectively, as shown in Table 3. , 1.3Kg/15mm, and when opened from the lid tab, peeling was easy and adhesiveness was uniform. On the other hand, in Comparative Examples 2 and 3, there were no problems with retort resistance and sealing performance, but as shown in Table 3, the seal strength was 5.6 kg/15 mm and 4.0 kg/15 mm on average, respectively. It was extremely difficult to open the lid from the tab. Further, in Comparative Example 4, as shown in Table 3, the seal strength was weak at 0.4 kg/15 mm, and there were problems in retort resistance and sealing performance.

【table】 [Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a sealed container according to an embodiment of the present invention, and FIG. 2 is a plan view of the container body shown in FIG. Main body, 2 is a bottom part, 3 is a side wall part, 4 is a flange part, 6 is a lid body, 7 is a groove provided in the flange part, 8 is a heat sealing blend resin layer, 9 is a metal foil substrate, 10 is an olefin system Each polymer film layer is shown.

Claims (1)

[Scope of Claims] 1. A seamless container body consisting of a bottom, a side wall, and a flange that are integrally formed by drawing a metal material, and a lid that sealingly engages the flange of the container body. In the sealed container, the container body has a circumferential groove in the flange portion and an acid- or acid anhydride-modified olefin polymer A filled in the groove.
and 1 whose main constituent olefin units are different from those of the acid- or acid anhydride-modified olefin-based polymer.
The lid is provided with a layer of a blend of at least one type of olefinic polymer B, and the lid body has a main constituent olefin unit on its inner surface made of an olefinic polymer of the same type as that of the acid- or acid anhydride-modified olefinic polymer. An easily openable sealed container comprising an inner surface layer, wherein the container body and the lid are sealed by thermal fusion of the blend layer and the inner surface layer. 2. Claim 1, wherein the blend layer contains acid or acid anhydride-modified olefin polymer A and olefin polymer B in a weight ratio of A:B = 80:20 to 20:80. Sealed container as described in section. 3. The seal according to claim 1, comprising a blend layer in which the acid or acid anhydride-modified olefin polymer A is a propylene polymer, and the olefin polymer is an ethylene polymer. container. 4. The sealed container according to claim 3, wherein the ethylene polymer is polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-acrylic copolymer, or an ionically crosslinked ethylene copolymer.