JPH06183453A - Container lid - Google Patents

Abstract

PURPOSE:To prevent degradation due to oxidation of content and propagation of bacteria or the like in a method wherein remaining oxygen within a head space in a container or dissolved oxygen into the content is absorbed without lowering performance of a safty button which is provided in a cap, making foreign matter dissolved into the content, nor marring flavor of the content. CONSTITUTION:In a container lid 1 comprising a container lid shell 2 formed of a top plate part 3 and a skirt part 4, and having such an inclined panel part 9 in the center of the top plate part 3 as protrudes inwardly at a time of sealing under a reduced pressure and outwardly after opening the container lid 1, and a gascket 5 provided in a sealing part inside the top plate part 3, the sealing gascket 5 is formed annularly on an outside part excluding the panel part 9 and an oxygen absorbing member 10 is provided in the central part of the panel part 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container lid having an unopened guarantee function capable of certifying that the inside of the container is in a vacuum-sealed state in order to prevent tampering with the container filled with contents. More specifically, the present invention relates to a container lid having an unopened guarantee function that is particularly excellent in the storage stability of contents.

[0002]

2. Description of the Related Art In the production of canned and bottled products, there is always a space called a head space at the top of a can body or bottle, and oxygen remaining in this head space oxidatively deteriorates the contents, and further mold, The problem is that it causes the growth of yeast, bacteria and the like.

In order to remove oxygen in the head space, the present inventors have proposed a container lid having a gasket containing a deoxidizer (Japanese Patent Publication No. 4-31949). When such a container lid is attached to the container filled with the contents, the residual oxygen in the head space in the container or the contents is removed without foreign matter being eluted into the contents or spoiling the flavor of the contents. The dissolved oxygen can be absorbed, and the oxidative deterioration of the contents and the growth of microorganisms are effectively prevented.

On the other hand, in order to prevent tampering that causes the container lid to be reopened once it has been opened and seemingly to be unopened, before opening the container, the container is vacuum-sealed under reduced pressure. This causes the cap top plate to dent inward, the decompression inside the container is released when the cap is opened, and the cap top plate protrudes outward. At this time, the cap makes a "pong!" Sound, which is generally called a safety button. Have,
A container lid that guarantees that the cap is unopened is known (Japanese Patent Publication No. 61-11354).

[0005]

Even in a container using a cap having such an unopened guarantee function, it is desired to effectively remove residual oxygen in the head space in the container. Is inclined to the inside due to depressurization, and in order to move this outside to make a sound when opening, it is particularly important to adjust the thickness of the center of the top plate of the cap shell and the angle of inclination. When a gasket containing such an oxygen scavenger is applied to the entire surface of the cap top plate, there is a problem that the safety button may not be able to reliably perform its function.

Therefore, an object of the present invention is to prevent foreign matter from being eluted in the contents without impairing the performance of the safety button,
Alternatively, without impairing the flavor of the contents, a container lid that can effectively absorb residual oxygen in the headspace inside the container or dissolved oxygen in the contents to effectively prevent oxidative deterioration of the contents and growth of microorganisms etc. To provide.

[0007]

According to the present invention, a top plate portion and a skirt portion are formed, and the center of the top plate portion is convex inward when sealed under reduced pressure, and is convex outward after opening. A container lid comprising a container lid shell provided with an inclined panel portion and a gasket provided in a sealing portion on an inner surface of the top plate portion, wherein the sealing gasket has an annular shape in an outer portion excluding the panel portion. A container lid is provided, wherein an oxygen absorbing member is provided in a central portion of the panel portion. In the present invention, it is particularly preferable that the oxygen absorbing member is provided with a sol composition including a resin composition, a plasticizer, and an oxygen absorbent.

[0008]

In general, the container lid of the present invention is better than the container lid shell having the safety button, the gasket provided in the sealing portion on the inner peripheral edge of the top plate of the container lid shell, and the inclined portion forming the safety button. It is composed of a resin composition containing an oxygen absorber provided in the center.

The safety button used in the present invention generally means that the central portion of the top plate of the lid shell of the container maintains an upwardly convex state in a normal state, and the downward button is applied when the inside of the container is depressurized. (Inner surface side of container) It means that a convex state is formed. Therefore, before opening the container, the consumer can visually confirm that the reduced pressure inside the container is maintained if the central part of the top plate of the container lid is dented, and by opening the container, the reduced pressure inside the container is released. Then, the safety button returns to the normal state, that is, the state where it is convex upward, and at this time, the sound of "Pon!" Is emitted, which shows that the container was auditorily maintained in the reduced pressure state. Of.

As described above, this safety button functions by adjusting the thickness of the center of the top plate of the cap shell, the angle of inclination, etc. Therefore, in order to apply the oxygen absorbent to the inner surface of the top plate, this safety button is used. It is necessary not to affect the thickness and the inclination angle. In the present invention, to the container lid having such a safety button, in order to impart the function of improving the storability of the contents, the residual oxygen in the headspace in the container or the dissolved oxygen in the contents is effectively captured. The composition containing a possible oxygen absorber is applied to a position where oxygen in the headspace can be effectively trapped and the function of the safety button is not impaired, that is, a central portion inside the top plate portion above and below. Of.

In the container lid of the present invention, since an oxygen absorbent and an oxygen absorbing member made of a resin composition capable of holding the oxygen absorbent almost completely are provided at the center of the safety button,
The oxygen absorbent does not come off, the oxygen absorbent does not elute into the contents, or the flavor of the contents is not impaired. Further, the oxygen absorbent is present in the resin, sufficiently absorbs oxygen entering the resin layer, and can efficiently absorb oxygen in the container head space. In particular, when a sol composition composed of a resin composition and a plasticizer and an oxygen absorber is present therein by dispersion such as kneading, the workability is excellent and the container lid can be easily manufactured. is there.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The container lid of the present invention will be described with reference to the accompanying drawings. In FIG. 1, which shows a cross-sectional view of an essential part of an example of a container lid of the present invention, a container lid generally designated by 1 is located inside a container lid shell 2 composed of a top plate portion 3 and a skirt portion 4 and a peripheral edge of the top plate portion. It consists of a sealing annular gasket 5. An annular inclined portion 7 that inclines downward is formed on the center side of the sealing portion 6 provided with the sealing gasket 5 of the top plate portion 3, and acts on the panel portion 9 with the root portion 8 of the annular inclined portion 7 as an axis. The inclined portion 7 moves up and down to change the inclination upward or downward in accordance with the force exerted, and the safety button composed of the inclined portion 7 and the panel portion 9 shows a convex shape upward or downward. In FIG. 1, which shows a normal state, the panel portion 9 is in a state of being convex upward. Also, the panel section 9
An oxygen absorbing member 10 is applied to the inner central portion of the.

In FIG. 2 in which the container lid of the present invention shown in FIG. 1 is applied to a container and the inside of the container is depressurized, the tip 12 of the container mouth 11 contacts the sealing gasket 6, and Retains hermeticity. Further, the skirt portion 4 is formed with an engagement portion 14 that engages with the bead 13 of the container opening portion. Since the panel portion 9 is sucked inside the container due to the reduced pressure inside the container, the annular inclined portion 7 is inclined downward toward the center and is convex downward.

(Container lid shell body) The container lid shell body used for the container lid of the present invention is not limited to the embodiment shown in the drawings, and all of the various manners adopted for the conventionally known cap having a safety button are adopted. can do. As the material of the container lid shell, all metal plates used in this type of container can be used, but the yield stress is 25 to 7 in particular.
0Kg / mm ² Plate thickness is in the range of 0.14 to 0.3mm,
A metal plate such as a steel plate, a surface-treated steel plate, and an aluminum plate can be effectively used. Although the angle of the annular inclined portion varies depending on the diameter of the cap, the width of the inclined portion, etc., it is preferable that the annular inclined portion has an inclination of 2 ° to 75 ° with respect to the top plate portion in a normal state.

The oxygen absorbent, resin composition and plasticizer constituting the oxygen absorbing member used in the present invention are as follows. (Oxygen Absorber) In the present invention, the oxygen absorber is insoluble in water and has a large molecular weight from the viewpoint of retaining the flavor of the content and preventing migration and elution of foreign matter into the content. Preferably, the following (a) to (c) can be exemplified. (a) Phenol / aldehyde resin A resin having an oxygen-absorbing group on its molecular chain, particularly a phenol / aldehyde resin having a plurality of phenolic hydroxyl groups per ring in the phenol skeleton is preferable. When polyhydric phenol is incorporated into phenol aldehyde resin as a phenol skeleton, its alkyl substitution effect significantly promotes oxygen absorption, and polymerizing polyhydric phenol as a resin elutes and migrates to the contents. Is completely suppressed. Moreover, the absorbed oxygen is produced as water and rendered harmless. The phenol skeleton forming the phenol / aldehyde resin is preferably one having two phenolic hydroxyl groups in the para position, and for example, hydroquinone / catechol, methylhydroquinone, pyrogallol and the like are particularly preferably used.

It is preferable that the polyhydric phenol used is a polyfunctional compound having a functionality of two or more with respect to an aldehyde, but even a monofunctional one can be incorporated into the phenol skeleton in the form of a polymer chain terminal. it can. Further, the polyhydric phenol can be used alone or in combination with other phenols. Phenols that can be used in combination include trifunctional phenols such as m-cresol, m-ethylphenol, and 3,5-xylenol;
Bifunctional phenols such as o-cresol, p-cresol and p-tert-butylphenol; monofunctional phenols such as 2,4-xylenol and 2,6-xylenol; bisphenol A, bisphenol B, bisphenol F and the like Mention may be made of polycyclic phenols.

It is important that the polyhydric phenol component be introduced into the phonolaldehyde resin without being oxidized during the condensation reaction of the above-mentioned phenols and aldehyde. This is because the oxidation reaction of polyhydric phenol is significantly promoted on the alkaline side. From this point of view, the phenol component and formaldehyde may be polycondensed in the presence of an acid catalyst such as oxalic acid or phosphoric acid and used in the form of a novolac type phenol aldehyde resin.

The polyhydric phenol-containing phenol aldehyde resin used in the present invention is a modifier known per se as long as its essence is not lost, such as fatty acid, polymerized fatty acid, resin acid (rosin), drying oil, alkyd resin and the like. It is also possible to modify with one or more of the above, and then to combine with an epoxy resin, or to modify both of these resins with a modifier such as vinyl acetal (butyral) or amino resin, if desired. These modifiers are 0.
It can be used in an amount of 01 to 5.0%, 0.1 to 2.0%.

These phenol aldehyde resins which can be used in the present invention are used alone or in combination with other resins as oxygen absorbers. At this time, a phenol skeleton having a plurality of phenolic hydroxyl groups per ring is added in an amount of 50 mmol or more, particularly 100
It should be contained in an amount of millimolar or more. That is, when the content of the polyhydric phenol skeleton is less than the above range, when it is used as an oxygen absorber, sufficient oxygen absorbency to effectively prevent oxidative deterioration of the food content is not obtained. In addition, there is no particular inconvenience even if the amount of the polyhydric phenol skeleton is large, but since the yield of the resin may decrease and the amount of the soluble component may increase, the concentration of the polyhydric phenol skeleton is 850 mmol / mol. 100g or less, especially 8
It is preferably not more than 00 mmol / 100 g.

(B) Inorganic oxygen absorber In the present invention, since the oxygen absorber can be used by kneading it in the elastomer, it does not elute,
Inorganic oxygen absorbers, especially those in powder form, can be used. Such an oxygen absorbent may be water-soluble or water-insoluble, and specifically, iron powder or iron group metal such as iron powder coated with a metal halide or iron carbide,
Silicon iron and other alloys of iron group metals; compounds of divalent iron group metals such as ferrous sulfate, ferrous chloride, ferrous oxide and the like. These are particularly preferably used together with salts and basic substances described later.

(C) Other Organic Oxygen Absorber In the present invention, the organic oxygen absorber can be used together with the electron donating substance. Specifically, ascorbic acid,
A combination of erythorbic acid or tocophenol and an electron-donating substance; a sugar such as glucose, fructose, galactose, maltose, cellobiose and an electron-donating substance, particularly a basic substance or a sugar oxidase such as glucose oxidase; hydroquinone, Combinations of polyhydric phenols such as gallic acid, catechol, and pyrogallol with electron-donating substances described below can be used.

The oxygen absorbent is the resin composition 100 described later.
The amount is preferably 0.1 to 50 parts by weight, more preferably 5 to 40 parts by weight, based on parts by weight. When the amount of the oxygen absorbent is less than this range, the effect of absorbing the residual oxygen becomes unsatisfactory, while when it is more than this range, the characteristics of the resin are impaired.

(Resin Composition) The oxygen absorbing member of the present invention comprises
The following resin composition, for example, a plastisol consisting of a resin and a plasticizer, a sol composition such as an organosol consisting of a resin and an organic solvent, or a rubber composition such as an elastomer resin, and an oxygen absorber or the like mixed with other resins. can do. Sol composition As a resin that can be provided as a plastisol, for example, vinyl chloride resin, acrylate polymer, polymer mainly composed of polymethacrylate, ABS copolymer, styrene / acrylonitrile copolymer, polyvinyl acetal / unsaturated polyester copolymer , Polyphenylene oxide, and the like, and in the form of plastisol, the handling and processability can be made excellent.

As the plasticizer for forming plastisol, there are commonly used di-2-ethylhexyl phthalate, di-n-octyl phthalate, diisobutyl phthalate, diphenyl phthalate, diisodecyl phthalate, butyl benzyl phthalate, ethyl phthalyl ethyl glycol. Phthalic acid derivatives such as phthalate and butylphthalylbutyl glycolate; Di-2-ethylhexyl adipate, diisodecyl adipate, diisononyl adipate, adipic acid derivatives such as di- (butoxyethoxyethyl) adipate; di-2-ethylhexyl azelate,
Azelaic acid derivatives such as di-n-hexyl azelate;
Sebacic acid derivatives such as di-2-ethylhexyl sebacate and di-n-butyl sebacate: Maleic acid derivatives such as di-n-butyl maleate; epoxidized soybean oil, epoxidized linseed oil, epoxidized linseed oil fatty acid butyl, epoxidized castor oil Epoxy derivatives such as; chlorinated paraffin,
Glyceroyl triacetate, polyethylene glycol, phosphoric acid derivatives such as 2-ethylhexyl diphenyl phosphate, citric acid derivatives such as acetyltri-2-ethylhexyl citrate, oleic acid derivatives such as butyl oleate, and butyl acetyl ricinoleate Such ricinoleic acid derivatives, stearic acid derivatives such as n-butyl stearate, sulfonic acid derivatives and the like can be used. The amount of the plasticizer is appropriately contained depending on the softness of the plastisol.

As the organosol, those in which the resin composition is dispersed in a relatively high boiling solvent such as aromatic hydrocarbon, alicyclic compound and cellosolve can be used.

Rubber composition As a rubber composition capable of supporting an oxygen absorber, a thermoplastic styrene-butadiene-styrene block copolymer, a thermoplastic styrene-isoprene-styrene copolymer, ethylene-propylene rubber, ethylene- Propylene-non-conjugated diene rubber, styrene-butadiene rubber, nitrile-butadiene rubber, butyl rubber, natural rubber, polybutadiene, chloroprene rubber, polyurethane, acrylic rubber, silicone rubber and the like can be used.

Other Resins Other resins that can carry an oxygen absorber include polyolefins such as polyethylene and polypropylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyacrylic acid, polymethyl acrylate, polyacrylic acid. Thermoplastic resins such as soda, polyethylene oxide, and modified products thereof, or a mixture of two or more thereof can be used.

The oxygen absorbing member of the present invention may contain various known components in addition to the above-mentioned essential components. For example, calcium carbonate, silica, various clays, magnesium hydroxide, magnesium carbonate, aluminum silicate, magnesium silicate, barium sulfate, diatomaceous acid are added for the purpose of increasing the amount of the sol composition, imparting shape retention, and controlling the physical properties. Soil, mica, fillers such as Aspest can be used, and in order to adjust the hue thereof, white pigments such as titanium dioxide, carbon black, phthalocyanine blue, phthalocyanine green, red iron oxide,
A coloring pigment such as titanium yellow can be blended. Further, a tackifier such as coumarone resin, petroleum resin, rosin or modified rosin may be blended for the purpose of enhancing the adhesion to the container shell. A stabilizer may be added for the purpose of protecting the composition when the oxygen absorbent is mixed with the composition or when the composition is embossed. In this case, the commonly used stearic acid or laurate zinc, calcium, lithium,
Magnesium, aluminum and the like are preferably used.

(Electron Donor and Hydrophilic Polymer Compound)
In the present invention, in order to increase the oxygen absorption capacity,
It is particularly preferable to coexist an electron-donating substance or a hydrophilic polymer compound with the oxygen absorber. When a hydrophilic polymer compound is added and kneaded, it is considered that the sol composition has increased water vapor permeability and water retention. Oxygen absorbent has improved reaction or oxygen scavenging ability in the presence of water or moisture, and is exposed to high humidity atmosphere in the container to retain water vapor and water in the container, and this water is effectively mixed with the resin. It is possible to enhance the oxygen scavenging ability of the kneaded oxygen absorbent and to promptly capture oxygen in the head space.

When the electron-donating substance is kneaded, the reaction of the oxygen-absorbing agent is activated by the action of the electron-donating substance, and oxygen in the container can be quickly captured. When the organic substance and the hydrophilic polymer compound are used in combination, the electron-donating substance has a significantly improved oxygen-scavenging ability in the presence of water.

In the present invention, it is preferable to use a combination of 1 to 200 parts by weight, particularly 2 to 100 parts by weight of an electron-donating solid base per 100 parts by weight of the oxygen absorbent. The electron-donating substance is a substance that can participate in the exchange of electrons during the redox reaction of the oxygen absorbent. For example, the electron-donating substance is a water-insoluble substance in terms of flavor retention and hygienic properties of the content. However, all electron-donating substances such as anion exchange resins, zinc oxide, magnesium carbonate, silicates, zeolites, melamine resins, urea resins and ammonia resol resins can be used. In addition, in the inorganic oxygen absorbent, in addition to the above substances, sodium chloride,
Salts such as sodium sulfate, sodium nitrate, potassium chloride and calcium chloride can be preferably used.

The hydrophilic polymer compound is preferably provided as a dispersed phase in the sol composition. In the present invention, the following may be specifically mentioned as the hydrophilic polymer compound.
Weight gain of 0.1% when immersed in distilled water at ℃ for 24 hours
Above, especially 1% or more can be preferably used.

Examples of the hydrophilic polymer substance include gelatin, modified casein, modified starch sodium alginate, tracant rubber, polyvinyl alcohol, methyl cellulose, ethyl cellulose, hydroxypropylmethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and other cellulose derivatives; polyvinyl acetate partially saponified product. , Polyvinyl methyl ether, polyacrylic acid,
Polymethacrylic acid, vinyl methyl ether / maleic anhydride copolymer, acrylate polymer, acrylic acid / vinyl alcohol copolymer, polyvinylpyrrolidone, acrylamide / acrylate copolymer, acrylamide / methylenebisacrylamide copolymer Partially saponified product, vinyl acetate / methyl acrylate copolymer saponified product, polyoxyethylene compound, polystyrene sulfonic acid, poly-2
-A hydrophilic compound such as acrylamido-2-methylpropanesulfonic acid can be incorporated. Further, these hydrophilic polymer compounds account for 1% or more in the sol composition,
It is particularly preferable to add 5% or more.

(Gasket) In the present invention, the gasket provided around the top plate is indispensable for maintaining the hermeticity of the container, and all resin compositions conventionally used for gaskets can be used. However, like the oxygen absorbing member described above, it is most preferable to use a sol composition containing an oxygen absorbing agent. As a result, it is possible to efficiently perform invasion of oxygen from the outside and absorption of residual oxygen together with the oxygen absorbing member, and it is also excellent in sealing property and workability.

(Method of Application) In the container lid of the present invention,
In order to form a sealing gasket on the inner surface of the top plate portion of the container lid shell formed by press molding or the like, the sealing portion (peripheral portion) on the inner surface of the top plate portion that is rotated about the center of the top plate portion is used to form a sealing gasket. The gasket forming material such as plastisol is dropped to form an annular gasket. Next, when the oxygen absorbing member is made of a sol composition, the sol composition containing the oxygen absorbing agent is dropped onto the central portion of the top plate portion and is stretched by rotation to apply the sol composition having a desired size and thickness. Alternatively, the sol composition may be dropped at a position slightly distant from the central portion and extended by rotation to form a donut shape.
In the case of using a resin other than this, it is also possible to apply a resin composition containing an oxygen absorbent to the center of the top plate and press and fix it. At this time, in order not to affect the vertical movement of the safety button, the thickness of the safety button should be in the range of 0.1 to 2.0 mm in the central area of 10 to 95%. It is preferred to apply a sol composition.

[0036]

【Example】

Example 1 A lug cap having an outer diameter of 60 mm was prepared from a tin-free steel plate (plate thickness after coating was 0.19 mm) printed and painted on the inner and outer surfaces. A sealing gasket is formed on the inner surface of the lid with a width of 7 mm from the outer peripheral portion, and the first button button that is convex upward is formed at the position of a radius of 16 mm from the center toward the center when the pressure is concentric with a width of 4 mm. Then, a second button having an upward convex shape was formed at a position with a radius of 5 mm from the center under normal pressure to form a cap shell having a so-called safety button mechanism. The cap shell is lined with a sealing gasket material while rotating the cap shell at high speed, and at the same time, 10 mm, 18 mm, and 24 mm of plastisol containing oxygen absorber are placed in the center of the lid.
(The above-mentioned product of the present invention) was applied to have diameters of 35 mm and 43 mm, and heated at 200 ° C. for 1 minute to gel. This cap was put into a simulation container, the inside pressure was reduced by 20 cmHg, and the deformation of the button part and the sound at the time of opening the cap were examined. In addition, mandarin orange wrap was put in an ordinary glass bottle, and the quality state of the contents after storage (23 ° C.-60% RH) was determined by measuring the absorbance of syrup at 230 nm. The results are shown in Table 1. As a comparative product for the quality test, a cap having only the gasket on the outer peripheral portion was used.

[0037]

[Table 1] (1) The depth of the button depression at 56 cmHg. (2) The larger the discoloration degree value of syrup pickled with mandarin orange, the more the discoloration progressed.

Example 2 The oxygen-absorbing sol having an inner diameter of 12 mm and an outer diameter of 23 mm was lined by removing the second button-processed portion in the central part of the lug cap with a safety button prepared in Example 1. At the same time, the gasket for the hermetically sealed portion on the outer peripheral portion was also lined and heated to gel. As in the first embodiment, the deformation of the button portion, the sound of opening,
When the change in quality over time due to the filling with mandarin orange wrap was measured, the deformation of the button part was sufficient, the sound at the time of opening was no problem, and the quality retention was excellent.

Example 3 A press-on twist-off cap molded from a coated plate obtained by coating 0.18 mm-thick tin-free steel with an epoxy-phenolic coating on the outer surface and a phenolic epoxy resin mixed with an oxidized polyethylene resin on the inner surface. Outer diameter 35m
m, the first button processing with a width of 4 mm toward the center is convex at the time of normal pressure, and then the second button processing is convex at the center with a diameter of 10 mm at the time of normal pressure. The sol compound was applied to the inside with a width of 7 mm and dried by heating. Next, a fixed amount of an oxygen-absorbing resin composition prepared by mixing 20% of an iron-based composition as an oxygen absorber with a polyethylene resin was placed in the molten state at the center of the cap, and press-formed into a disk shape. The disk diameter is 25 mm and the thickness is 0.
It was 8 mm. As in Example 1, the deformation under reduced pressure, the sound when opening the cap, and the storage performance of the contents were examined. Although the downward convex deformation under reduced pressure was smaller than that of the product of the present invention of Example 1, it was sufficiently recognizable, and the sound at the time of opening was not a problem. The storage performance was also sufficiently superior to the comparative product.

[0040]

According to the present invention, in a container lid having a safety button, a container is provided without impairing the performance of the safety button, without elution of foreign matter into the contents, or the flavor of the contents. The residual oxygen in the headspace inside or the dissolved oxygen in the contents was effectively absorbed, and the oxidative deterioration of the contents and the growth of microorganisms could be effectively prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an example of a container lid of the present invention.

FIG. 2 is a cross-sectional view of relevant parts showing a state where the container lid shown in FIG. 1 is applied to a container and is in a reduced pressure state.

[Explanation of sign]

 1 Container Lid 2 Container Lid Shell 3 Top Plate 4 Skirt 5 Sealing Gasket 7 Slope 9 Panel 10 Oxygen Absorbing Member

Claims (11)

[Claims] 1. A panel portion, which comprises a top plate portion and a skirt portion, is provided at the center of the top plate portion, and has a slope that is convex inward when sealed under reduced pressure and convex outward after opening. A container lid comprising a container lid shell and a gasket provided in a sealing portion on an inner surface of the top plate portion, wherein the sealing gasket is annularly provided in an outer portion excluding the panel portion, and in a central portion of the panel portion. A container lid, which is provided with an oxygen absorbing member. 2. The sealing gasket is a resin composition,
The container lid according to claim 1, which is a sol composition comprising a plasticizer and an oxygen absorber. 3. The container lid according to claim 1, wherein the oxygen absorbing member is a sol composition including a resin composition, a plasticizer and an oxygen absorbing agent. 4. The container lid according to claim 1, wherein the oxygen absorbing member is a rubber composition including an elastomer resin composition and an oxygen absorbent. 5. The sol composition is prepared by kneading an oxygen absorbent in a resin component or dispersing the oxygen absorbent in the resin solution or molten resin.
Alternatively, the container lid according to claim 2 or 3, which is dispersed and contained when the plasticizer is blended with the resin. 6. The electron donor and / or the resin composition in the resin composition.
Alternatively, the container lid according to any one of claims 3 to 5, further comprising a hydrophilic polymer compound. 7. The container lid according to claim 2, wherein the oxygen absorbent comprises a phenol / aldehyde resin having a plurality of phenolic hydroxyl groups per ring in the phenol skeleton. 8. The container lid according to claim 2, wherein the oxygen absorbent is made of powder of an iron group metal or an alloy of an iron group metal. 9. The container lid according to claim 2, wherein the oxygen absorbent is composed of ascorbic acid, erythorbic acid and salts thereof, or a combination of tocophenol and a basic substance. 10. The container lid according to claim 2, wherein the oxygen absorbent comprises a combination of sugar and sugar oxidase. 11. The container lid according to claim 2, wherein the oxygen absorbent is a polyhydric phenol.