JPH11260256A - Aperture mask storing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the oxidation of an aperture mask and prevent the generation of color displacement or nonuniformity of a screen, when it is used for a color image receiving tube by sealing it together with an oxide absorbent, which does not require moisture for absorbing oxide and a dehumidifying agent into a gas barrier container. SOLUTION: An aperture mask is sealed together with an oxide absorbent which does not require moisture for absorbing oxide and a dehumidifying agent, preferably furthermore, an acid vapor absorbent into a gas barrier container. The oxide absorbent contains mainly unsaturated organic compounds of an unsaturated fatty acid compound and chain hydrocarbon polymers having unsaturated groups, and thermoplastic polymers such as polyamide or polyolefine, and preferably contains oxide absorption accelerating materials. Ratio of each component in the oxide absorbent is preferably 0.01-40 pts.wt. of the oxide absorption accelerator, and 1-1,000 pts.wt. of carrier material with respect to 100 pts.wt. of the main agent. As the dehumidifying agent, paper or synthetic paper made of natural pulp or synthetic pulp, silica gel, synthetic zeolite or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shadow mask or a Trinitron (registered trademark) tube which is used for a color picture tube and has a large number of slot-shaped or dot-shaped fine through holes, and which is used for a multiplicity of parallel elongated tubes. In the case of manufacturing an aperture grill having through holes (hereinafter, referred to as “aperture mask”) by an etching method,
The present invention relates to a method for storing an aperture mask for preventing rust from being generated on the surface of an aperture mask product. More specifically, an aperture mask that prevents the quality of the aperture mask, such as color misregistration and image unevenness (mottling), from being changed when the aperture mask is used for a color picture tube due to a change in the shape of the through hole on the surface of the aperture mask. On how to save.

[0002]

2. Description of the Related Art A color picture tube includes an electron gun that emits three electron beams, a phosphor that receives the electron beams emitted from the electron gun and emits light in three primary colors, a combination of these phosphors and the electron gun. And an aperture mask for selectively transmitting only an electron beam in a necessary direction of each electron beam and blocking an electron beam in an unnecessary direction. Among these components, the aperture mask is manufactured using a photo-etching method.

[0003] The aperture mask is made of a coil-shaped aperture mask material such as 42 alloy or low-carbon steel sent from a steel plate manufacturer. Thereafter, a resist film is formed on both front and back surfaces. Next, each mask material having a hole pattern corresponding to an electron beam passage hole to be formed is brought into close contact with the image position on the front side and the back side, and exposure is performed. Subsequently, the resist film is developed by hardening treatment, and a resist film having a required pattern image is formed on both main surfaces of the aperture mask. Next, using a ferric chloride aqueous solution, spray etching is performed on both main surfaces of the aperture mask material to form a large number of through holes, and then the resist film is peeled off from both surfaces of the aperture mask material. Finally, the aperture mask obtained by cutting one by one is subjected to an annealing process by a color picture tube maker and then press-formed,
After being subjected to a blackening process, it is incorporated into a color picture tube.

[0004] Rust on the surface of the aperture mask during the process of receiving the manufactured aperture mask from the aperture mask manufacturer to the color picture tube manufacturer adversely affects the quality of the color picture tube in which the mask is incorporated. For example, when rust is generated in the vicinity of the through hole of the aperture mask, the inner peripheral surface thereof, or the like, the shape of the through hole changes, which greatly affects the shape of the phosphor. Further, when rust is generated on the surface of the aperture mask and grows, the blackened film formed by the blackening process is also adversely affected. Therefore, it is important to prevent rust from occurring on the aperture mask.

[0005] When rust frequently occurs in the aperture mask product, it is also used for re-washing for the purpose of removing rust and preventing rust, which requires facilities, time and labor. There was a problem. Japanese Patent Application Laid-Open No. Hei 6-260086 discloses a method for preserving an aperture mask by applying a vaporizable rust inhibitor during a shadow mask manufacturing process and forming a surface protective film on the shadow mask material. A method for preventing rust from being generated is disclosed. However, the aperture mask is very rusty, and the rust prevention effect is insufficient even with this method.Especially, rust frequently occurs during the rainy season, and a part of the vaporizable rust preventive agent shows traces of impurities on the surface of the aperture mask material. And there is a problem that the product quality may be adversely affected.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and prevent the aperture mask from being oxidized. This is a method for storing an aperture mask, which prevents the quality from being adversely affected.

[0007]

In order to solve the above-mentioned problems, the present inventors need to place the shadow mask in an environment excluding both oxygen and moisture. In addition, they have found that it is necessary to seal in a gas barrier container together with an oxygen absorber and a dehumidifier that do not require moisture for oxygen absorption, and completed the present invention. And surprisingly, by storing in the above atmosphere,
This makes it possible to prevent the aperture mask from being oxidized, and to prevent the screen from being affected by color shift, mottling, and the like when the aperture mask is used for a color picture tube.

That is, the present invention prevents the aperture mask from being oxidized by sealing it in a gas barrier container together with an oxygen absorbent and a dehumidifying agent which do not require moisture for oxygen absorption, and attaches the aperture mask to the color picture tube. This is a method for storing an aperture mask that prevents the occurrence of color misregistration and mottling on the screen when used. Further, the present invention is a method for storing an aperture mask which is hermetically sealed in a gas barrier container together with an oxygen absorbent, a dehumidifier and an acidic gas absorbent which do not require moisture for oxygen absorption. In addition, the oxygen absorbent that does not require moisture for oxygen absorption used in the present invention is one containing an unsaturated fatty acid compound and / or a chain hydrocarbon polymer having an unsaturated group as a main component and containing an oxygen absorption promoting substance. It is characterized by. Further, the method of the present invention is characterized in that the aperture mask is made of iron having a purity of 99% or more.

[0009]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, an aperture mask is provided with an oxygen absorbent and a dehumidifier that do not require moisture to absorb oxygen.
Preferably, it is necessary to further seal the gas barrier container together with the acidic gas absorbent. When these oxygen absorbers and dehumidifiers are not used, the aperture mask is oxidized and the shape of the through-holes changes, so when used in a color picture tube, color shift and mottling of the screen occur, adversely affecting the quality. .

The oxygen absorbent used in the present invention is not particularly limited as long as it does not require moisture for oxygen absorption. However, it is not limited to unsaturated fatty acid compounds or linear hydrocarbon polymers having unsaturated groups. An unsaturated organic compound, an oxygen absorbent mainly containing a thermoplastic polymer such as polyamide or polyolefin, and an oxygen absorbent containing an oxygen absorption promoting substance such as a transition metal salt. Examples thereof include an unsaturated fatty acid compound and / or an unsaturated group. An oxygen absorber containing a chain hydrocarbon polymer as a main component and containing an oxygen absorption promoting substance is preferred.

The unsaturated fatty acid compound used in the oxygen absorbent is an unsaturated fatty acid having 10 or more carbon atoms and having a double bond between carbon atoms, or a salt or ester of the unsaturated fatty acid. The unsaturated fatty acid and the salt or ester of the fatty acid may have a substituent, for example, a hydroxyl group or a formyl group. The unsaturated fatty acid compound does not necessarily have to be a single substance, but may be a mixture of two or more.

Examples of unsaturated fatty acid compounds include unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid, arachidonic acid, parinaric acid, dimer acid or ricinoleic acid, and oils and fats, esters and metals containing these esters. Salts. Fatty acids obtained from vegetable oils and animal oils as unsaturated fatty acids, such as linseed oil fatty acids, soybean oil fatty acids, tung oil fatty acids, bran oil fatty acids, sesame oil fatty acids, cottonseed oil fatty acids, rapeseed oil fatty acids and tall oil fatty acids are also used.

The chain hydrocarbon polymer having an unsaturated group is a polymer having at least 10 carbon atoms and having at least one double bond between carbon atoms, and derivatives thereof. The derivative may have, for example, a hydroxyl group, an amino group, a formyl group or a carboxyl group as a substituent. Examples of the chain hydrocarbon polymer having an unsaturated group include oligomers and polymers such as butadiene, isoprene and 1,3 pentadiene, and these are not necessarily required to be a single substance. It may be a mixture of two or more. The chain hydrocarbon polymer having an unsaturated group does not necessarily have to be a pure substance, and a small amount of impurities such as a solvent mixed in during the production thereof is permissible within a common sense.

Examples of the oxygen absorption promoting substance used in the present invention include metal salts and radical initiators that promote the oxidation of organic compounds. As the metal salt, Cu,
Transition metal salts such as Fe, Co, Ni, Cr, and Mn are preferable. As the transition metal salt, for example, a naphthenic acid transition metal salt or an unsaturated fatty acid transition metal salt is suitably used.

When the main agent of the oxygen absorbent and the oxygen absorption promoting substance are liquid substances, it is preferable to support them. Examples of the carrier substance include paper made of natural pulp and synthetic pulp, synthetic paper, nonwoven fabric, and porous film. ,silica gel,
Examples thereof include synthetic zeolites such as alumina, activated carbon and molecular sieves, natural zeolites such as mordenite and erionite, and clay minerals such as pearlite and activated clay. It is also a practical usage to select a carrier substance selected as a dehumidifier or an acidic gas absorbent, and to make the carrier have a dehumidifying ability or an acidic gas absorbing ability.

The proportion of each component in the oxygen absorber is 0.01 to 40 parts by weight, preferably 0.05 to 10 parts by weight, more preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the main agent. Parts, and the carrier material is 1-10
It is in the range of 00 parts by weight.

Examples of the dehumidifier used in the present invention include paper made of natural pulp and synthetic pulp and synthetic paper, silica gel,
Alumina, activated carbon, synthetic zeolites such as molecular sieves, mordenite, natural zeolites such as erionite, perlite, activated clay, quicklime, barium oxide, calcium chloride, barium bromide, calcium hydride, calcium sulfate, magnesium chloride, magnesium oxide, Magnesium sulfate, aluminum sulfate, sodium sulfate,
Examples thereof include sodium carbonate, potassium carbonate, and zinc chloride. In addition, as a dehumidifying agent, one selected from oxygen absorbers and acidic gas absorbents to have a dehumidifying ability is also a practical method of use. In this case, it is necessary to add a dehumidifying agent again There is no. Furthermore, these dehumidifiers do not necessarily have to be a single substance, and may be a mixture of two or more.
The used weight of the dehumidifier is in the range of 1 to 1000 parts by weight based on 100 parts by weight of the main agent of the oxygen absorbent.

The acidic gas absorbent used in the present invention may be any substance capable of absorbing or adsorbing an acidic substance present in a sealed atmosphere, and examples thereof include paper, synthetic paper, synthetic resins, and synthetic zeolites such as molecular sieves. Porous substances exemplified by natural zeolites and activated carbon such as mordenite and erionite, and oxides, hydroxides, carbonates, organic acid salts and organic amines of alkali metals or alkaline earth metals are used. In addition, as the acidic gas absorbent, it is also a practical use to select an oxygen absorbent or a dehumidifying agent to have an acidic gas absorbing ability.
In this case, it is not necessary to add the acid gas absorbent again. Further, these acidic gas absorbents do not necessarily need to be a single substance, and may be a mixture of two or more kinds. The weight of the acid gas absorbing substance used is 100 parts of the main agent of the oxygen absorbent.
It is used in the range of 1 to 1000 parts by weight with respect to parts by weight.

The amount of the oxygen absorbent and the dehumidifying agent used in the present invention is such that the oxygen absorbent can absorb at least the oxygen in the space volume in the gas-barrier sealed container, and preferably the amount thereof. 1.1 to 10 times, and the dehumidifier is an amount capable of absorbing at least the water in the space volume in the gas-barrier sealed container;
It is preferably in the range of 1.1 to 500 times that amount, and is appropriately selected according to the barrier performance of the gas-barrier sealed container.

The oxygen absorbent, the dehumidifier and the acid gas absorbent of the present invention can be used by mixing respective components. These single agents or mixtures are suitably used in the form of powder, granules, tablets or sheets. Oxygen absorber,
It is not preferable that the dehumidifier and even the acid gas absorbent come into direct contact with the articles to be preserved, and are usually used as a package by packaging in a gas-permeable packaging material based on, for example, paper, nonwoven fabric, plastic, or the like. Is done. The oxygen absorbent may be partly or wholly in the form of a package together with a dehumidifier and an acid gas absorbent, or may be a separate package.
The form of the package is not necessarily limited, and examples thereof include a small bag, a sheet, a blister package, and the like, depending on the purpose. The packaging material and configuration of the package are not particularly limited.
Further, as a dustproof measure, the above-mentioned package is further covered with a dust-free packaging material which does not impair the permeability of oxygen, moisture and acid gas, and does not release dust generated from the package to the outside. It is also possible. However, if the package itself is dustproof, it is not necessary to cover it again with a dust-free packaging material.

The gas barrier container of the present invention may be, for example, a plastic film bag, a plastic container, a metal container, a glass container, etc., depending on the purpose. When the storage period is long, a container having particularly high gas barrier properties is preferable. Further, it is preferable that the gas barrier container is made of a transparent gas barrier material so that the shadow mask of the contents can be confirmed from outside the container. In the case of an opaque material, it is also a practical usage to partially combine a transparent gas barrier material. Also, when enclosing the shadow mask in the gas barrier container, the inside of the container may be replaced with an inert gas such as dry nitrogen gas or argon gas, and the gas replacement reduces the amount of the oxygen absorbent or dehumidifier used. Leads to.

The plastic film bag is preferably a metal foil such as an aluminum foil, or a laminated film having a high gas barrier property, in which silicon oxide, aluminum oxide, or the like is deposited. For example, a silicon oxide vapor-deposited laminate film is useful because it has a high gas barrier property and is transparent and its contents can be confirmed. When it is necessary to check the contents of an opaque bag such as an aluminum foil film bag, it is also a practical usage to use a transparent gas barrier material partially in combination. To seal the film bag, the opening may be sealed by heat sealing, or the inner edge of the opening may be sealed with an adhesive. In this case, the adhesive used preferably has good gas barrier properties. On the other hand, when the shadow mask is frequently taken in and out of the film bag and the film bag is used repeatedly, it can be sealed using a clip.

The gas barrier property of the plastic film bag is such that the oxygen permeability at 25 ° C. and 60% RH is 10%.
0 ml / m ² · Day · atm or less, preferably 10 ml / m ²
・ Day ・ atm or less, more preferably 1ml / m ²・ Day
· Atm or less and a water vapor permeability at 40 ° C. and 90% RH of 10 g / m ² · Day or less, preferably 5 g / m ² · Day
g / m ² · Day or less, more preferably 1 g / m ² · Day or less.

When a plastics container other than a film bag, a metal container or a glass container is used, the shape of the container is not necessarily limited, and may be, for example, circular or square. Further, the container is preferably a container which covers and seals the container opening, and more preferably a container which fits the lid to the container opening and seals. Further, the materials of the container and the lid may be different materials. Examples of the container include a tea caddy, a metal can with a lid, a metal can with a screw opening, a plastic container with a lid, a plastic container with a screw opening, a glass container with a lid, and a glass container with a screw opening. In order to maintain the airtightness of the sealed part of the container, use an airtight gasket, an O-ring or packing in the sealed part, or stick a seal tape based on a metal foil or a plastic film on which metal is deposited, Enhancing the airtightness by sealing with an adhesive is also a practical use. In the case of containers made of opaque material such as cans (metal cans),
It is also a practical usage to use a transparent gas barrier material partially in combination.

The gas barrier properties of plastics containers, metal containers, and glass containers depend on the permeation of the container material itself and the leakage from the fitting portion between the container body and the lid.
As the gas barrier property of the container, the permeation amount of oxygen into the container per unit volume at 25 ° C. and 60% RH is 5 ml / li.
t ・ Day ・ atm or less and 0.3g of water vapor permeation
/ Lit · Day or less.

[0026]

EXAMPLES Examples of the present invention will be shown below, and will be described more specifically. Note that the present invention is not limited to these examples. Example 1 Oxygen absorbent: A mixture of 1 g of soybean oil and 0.02 g of cobalt naphthenate (cobalt content 8%) was converted to zeolite 3.5.
g of a powdery composition obtained by mixing the mixture with 2.5 g of calcium oxide was filled in a gas-permeable small bag to prepare an oxygen absorbent. Hereinafter, it is called an oxygen absorbent.

Transparent laminated film bag: In the examples of the present invention, a ceramic vapor-deposited film laminated plastic film bag (gas barrier bag manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name “PTS”, size 220 mm × 300 mm) was used. Hereinafter, it is referred to as a transparent laminated film bag.

Storage of shadow mask: shadow mask (iron cut sample of 99.999% purity, about 130
mm square, thickness 0.2 mm, hole diameter 100 μmφ) and an oxygen absorbent were placed in a transparent laminated film bag, and 500 ml of air (4
(0 ° C., 95% RH), the opening of the bag was heat-sealed and sealed. Oxygen and moisture concentrations in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography to find that the oxygen concentration was 0.1% or less and the relative humidity was 3%. Then take out the shadow mask from the sealed transparent laminated film bag,
When the surface was observed with a magnifying glass, no change in the color of the shadow mask surface was observed, as was before storage. Further, after the shadow mask was subjected to an annealing treatment, the shadow mask was subjected to a blackening treatment and incorporated into a color picture tube. The mottling is uniform without transmission unevenness over the entire surface.
Met. Table 1 shows the results.

Example 2 The procedure of Example 1 was repeated, except that soybean oil as the oxygen absorbent was replaced by tall oil fatty acid. Oxygen and moisture concentrations in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography, and the oxygen concentration was 0.1% or less and the relative humidity was 3%.
Met. Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration and the initial state was maintained. In addition, the evaluation of motoling was A. Table 1 shows the results.

Example 3 Example 3 was carried out in the same manner as in Example 1 except that cobalt naphthenate as an oxygen absorbent was replaced by tall oil fatty acid cobalt (cobalt content: 6%). Oxygen and moisture concentrations in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography to find that the oxygen concentration was 0.1% or less and the relative humidity was 3%. Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration and the initial state was maintained. In addition, the evaluation of motoling was A. Table 1 shows the results.

Example 4 The procedure of Example 1 was repeated except that cobalt naphthenate as the oxygen absorbent was replaced by manganese naphthenate (manganese content: 6%). Oxygen and moisture in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography,
The oxygen concentration was 0.1% or less and the relative humidity was 3%.
Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration, and the initial state was maintained. In addition, the evaluation of motoling was A. Table 1 shows the results.

[0032]

[Table 1] Example 1 Example 2 Example 3 Example 4 Main agent Soybean oil Tall oil fatty acid Soybean oil Soybean oil Naphthenic acid Naphthenic acid Tall oil fatty acid Naphthenic acid catalyst Cobalt Cobalt Cobalt Manganese Appearance No change No change No change Motolink モA A A A

Comparative Example 1 A shadow mask (iron cut sample having a purity of 99.999%, about 130 mm square) was stored in an atmosphere of 40 ° C. and 95% RH. When the appearance of the shadow mask stored for 20 days was examined with a magnifying glass, rust was partially generated, and the shadow mask surface was partially brownish. In addition, in the evaluation of motoling, strong transmission unevenness was observed on the entire surface, and it was C which was not endurable. Table 2 shows the results.

Comparative Example 2 A shadow mask (iron cut sample having a purity of 99.999%, about 130 mm square) was placed in a transparent laminated film bag.
The opening of the bag was heat-sealed with 500 ml of air (40 ° C., 95% RH) enclosed, and sealed. When the oxygen concentration in the sealed transparent laminated film bag of the shadow mask stored for 20 days was measured by gas chromatography, the oxygen concentration was 20.7%. In addition, dew was formed in the transparent laminated film bag. Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the appearance was examined with a magnifying glass. As a result, rust was slightly observed. In addition, in the evaluation of motoling, slight transmission unevenness was observed in part,
Met. Table 2 shows the results.

[0035]

[Table 2] Comparative example 1 Comparative example 2 Packaging status No packaging Transparent laminated film 40 ° C 40 ° C 95% RH 95% RH Appearance Rust generated Slightly rusted Motolink II C B

Example 5 Example 5 was carried out in the same manner as in Example 1 except that the soybean oil as the oxygen absorbent was replaced with a liquid butadiene oligomer (A, number average molecular weight 1800). Oxygen and moisture in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography,
The oxygen concentration was 0.1% or less and the relative humidity was 3%.
Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration and the initial state was maintained. In addition, the evaluation of motoling was A. Table 3 shows the results.

Example 6 Example 6 was carried out in the same manner as in Example 1 except that the soybean oil as the oxygen absorbent was replaced with a liquid butadiene oligomer (B, number average molecular weight 1100). Oxygen and moisture in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography,
The oxygen concentration was 0.1% or less and the relative humidity was 3%.
Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration, and the initial state was maintained. In addition, the evaluation of motoling was A. Table 3 shows the results.

Example 7 Example 7 was carried out in the same manner as in Example 5, except that cobalt naphthenate as the oxygen absorbent was replaced by tall oil fatty acid cobalt. Oxygen and moisture concentrations in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography to find that the oxygen concentration was 0.1% or less and the relative humidity was 3%. Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was confirmed with a magnifying glass. As a result, there was no discoloration, and the initial state was maintained. In addition, the evaluation of motoling was A.
Table 3 shows the results.

Example 8 The procedure of Example 7 was repeated, except that the tall oil fatty acid cobalt as the oxygen absorbent was replaced by the tall oil fatty acid manganese (manganese content: 4%). Oxygen and moisture concentrations in the sealed transparent laminated film bag of the shadow mask stored for 20 days were measured by gas chromatography to find that the oxygen concentration was 0.1% or less and the relative humidity was 3%. Next, the shadow mask was taken out of the sealed transparent laminated film bag, and the discoloration was checked with a magnifying glass.
There was no discoloration, and the initial state was maintained. In addition, the evaluation of motoling was A. Table 3 shows the results.

[0040]

[Table 3] Example 5 Example 6 Example 7 Example 8 Main agent ABA A Naphthenic acid Naphthenic acid Tall oil fatty acid Tall oil fatty acid catalyst Cobalt Cobalt Cobalt Manganese Appearance No change No change No change Motolink ゛ A A A A

[0041]

According to the present invention, the aperture mask is simply sealed in a gas barrier container together with an oxygen absorbent and a dehumidifier, which do not require moisture to absorb oxygen, preferably together with an acid gas absorbent. An extremely simple method prevents rust on the surface of the aperture mask, thereby changing the shape of the through-holes on the surface of the aperture mask. When the aperture mask is used for a color picture tube, color shift or image unevenness of the screen ( Mottling) can be prevented from adversely affecting the quality.

Claims (4)

[Claims] 1. A method for storing an aperture mask, comprising sealing an aperture mask in a gas barrier container together with an oxygen absorbent and a dehumidifier that do not require moisture to absorb oxygen. 2. The aperture mask according to claim 1, wherein the aperture mask is sealed in a gas barrier container together with an oxygen absorbent, a dehumidifier, and an acidic gas absorbent that do not require moisture to absorb oxygen. Preservation method. 3. An oxygen absorbent which does not require moisture for oxygen absorption, mainly comprising an unsaturated fatty acid compound and / or a chain hydrocarbon polymer having an unsaturated group and containing an oxygen absorption promoting substance. Or the storage method of the aperture mask according to 2. 4. The method according to claim 3, wherein the amount of the oxygen absorption-promoting substance is 0.01 to 40 parts by weight based on 100 parts by weight of the main component of the unsaturated fatty acid compound and / or the chain hydrocarbon polymer having an unsaturated group. How to save the aperture mask.