JP2001198429A - Fluoroplastic resin composite member covered with peelable moisture impermeable film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluoroplastic resin composite member capable of extending the life of a treatment agent though a fluoroplastic resin excellent in the catching characteristics of fine particles generated from the treatment agent such as a moisture absorbent or an adsorbent is used as a wall material. SOLUTION: A treatment agent 1 is housed in a space formed by a wall material constituted of a gas permeable fluoroplastic resin film 11 and a gas impermeable support material 21 and a moisture impermeable film 31 is bonded to the fluoroplastic resin film 11 in a peelable manner by a self-adhesive layer 41 to substantially cover the fluoroplastic resin film 11. At a start time of use, the moisture impermeable film 31 is peeled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluororesin composite member containing a treating agent for removing predetermined gas components and fine particles from the atmosphere.

[0002]

2. Description of the Related Art Harmful impurities such as moisture, oxygen and fine particles in the atmosphere may reduce the reliability of various devices. For example, in a hard disk drive of a computer, there are problems such as damage to a disk drive head due to fine particles, and reduction in reliability due to surface contamination of the disk by organic vapor. In addition, in organic EL devices used for various displays and light emitting devices, the oxidation and denaturation of electrodes and organic light emitting materials due to moisture and oxygen in the device,
Separation between the electrode and the organic light-emitting material occurs, which causes a problem of deterioration of light-emitting characteristics due to generation of black spots.

In order to solve such a problem, use of a porous container containing a treating agent such as an adsorbent or a moisture absorbent has been proposed. Generally, the treatment agent is used as particles because the larger the surface area, the higher the adsorption efficiency. However, such particles include fine particles having a very small particle diameter, and fine dust is likely to be generated due to contact between the internal treating agents. In order to prevent contamination due to scattering of these fine particles and dust, the porous container needs to be devised so as not to release dust and the like to the outside.

Therefore, Japanese Patent Application Laid-Open No. 11-57377 discloses a polytetrafluoroethylene (hereinafter, referred to as “PTFE”) having a collection efficiency of 99.999% or more for fine particles having a particle diameter of 0.1 μm to 0.15 μm. Adsorbent-containing porous containers using a porous film as a wall material have been proposed. The PTFE porous film is superior in collection efficiency of fine particles as compared with a nonwoven fabric or the like. Also, PTFE
Fluororesins are excellent in chemical resistance and generate very little gas from themselves. Specifically, the above-mentioned publication discloses a porous container in which an adsorbent is included in a space formed by sealing the peripheral ends of a pair of superposed porous PTFE membranes.

[0005]

When the substance to be treated in the device to be used is a very small amount and is gradually generated or penetrates, a period during which the function of the treating agent such as an adsorbent is exhibited (in other words, a period of time). In this case, the life of the processing agent) is more important than the processing speed. For example, drying and deoxidation in the organic EL element need to be performed on a very small amount of the target substance for a long period of time. Even with the use of the porous container disclosed in JP-A-11-57377, the life of the treatment agent can be adjusted to some extent. However, in a conventional porous container,
Substantially, since the processing agent starts removing the target substance before being installed in the device, there is a limit in extending the life of the processing agent from the start of use. If the porous container is stored in an atmosphere subjected to a dehumidifying treatment or a deoxidizing treatment so that the treatment does not start before use, the cost becomes too high.

Therefore, the present invention provides a wall material for a treating agent,
Despite using a fluororesin that is excellent in capturing fine particles,
It is an object of the present invention to provide a fluororesin composite member capable of extending the life of a treatment agent.

[0007]

In order to achieve the above object, a first fluororesin composite member of the present invention comprises a treating agent for removing at least one selected from a predetermined gas component and fine particles, And a wall material that separates the external atmosphere, and the wall material has a gas permeable region formed of a fluororesin film or a laminate including the fluororesin film,
The gas-permeable region is substantially covered with a peelable non-permeable film.

The second fluororesin composite member of the present invention includes a treating agent for removing at least one selected from a predetermined gas component and fine particles, and a wall material for separating the treating agent from an external atmosphere. The wall material has a porous region made of a fluororesin film or a laminate containing the fluororesin film, and the porous region is substantially covered with a peelable non-permeable film.

In the fluororesin composite member of the present invention, the treating agent is kept in an untreated initial state in a storage state before use.
Then, by removing the moisture-impermeable film immediately before use, harmful impurities begin to be supplied to the treatment agent through the wall material separating the external atmosphere and the treatment agent in use. Since the gas permeates through the fluororesin film, the fluororesin composite member of the present invention is also excellent in collecting dust and the like generated from the treating agent.

[0010] In a preferred embodiment of the fluororesin composite member of the present invention, the treatment agent is contained in a container formed of a wall material. In another preferred embodiment of the fluororesin composite member of the present invention, the treatment agent is held in a layer laminated with the wall material. The layer holding the treating agent is preferably an adhesive layer. The use of the adhesive layer facilitates the fixing of the fluororesin composite member during use.

Further, in the fluororesin composite member of the present invention,
It is preferable that the wall material is composed of a gas-permeable region and a gas-impermeable region, or a porous region and a non-porous region. In this case, it is preferable that the moisture-impermeable film is joined to the gas impermeable region or the non-porous region. This is to surely prevent the fluorine resin film from being damaged when the moisture-impermeable film is peeled off.

When the wall material is composed of a porous region and a non-porous region, even if the non-porous region has a slight gas permeability characteristic derived from the characteristics of the film, the wall material is substantially formed. The gas permeates through the porous region. For this reason, if the porous region is covered with the moisture-impermeable film, the substantial processing start time of the processing agent can be delayed.

Although the members constituting the fluororesin composite member of the present invention will be described later, the fluororesin film is preferably a PTFE film, particularly a PTFE porous film, and the treating agent is selected from water vapor, oxygen, organic vapor and fine particles. An inorganic compound that removes at least one of the above is preferred.

[0014]

Preferred embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 are a cross-sectional view and a perspective view of one embodiment of a fluororesin composite of the present invention. In this fluororesin composite, the fluororesin film 11 and the supporting material 2 whose peripheral ends are joined to each other in a superposed state
1 is a wall material. The treatment agent 1 is contained in a container formed by the wall material. In this fluororesin composite, the wall material is composed of a gas-permeable region and a gas-impermeable region, the gas-permeable region is composed of the fluororesin film 11, and the gas-impermeable region is composed of the support material 21. Similarly, the wall material may be composed of a porous region and a non-porous region, the porous region may be composed of the fluororesin film 11, and the non-porous region may be composed of the support material 21.

The gas-permeable region (or porous region) is entirely covered with a moisture-impermeable film 31. The moisture-impermeable film 31 is supported in a releasable state via an adhesive layer 41 disposed at the peripheral end. In order to prevent the cohesive failure of the fluororesin film 11 due to the peeling of the moisture-impermeable film 31, as shown, the adhesive layer 41 may be formed only on a part of the moisture-impermeable film, particularly only along the peripheral edge. preferable.

Also, as shown in the same drawing, the adhesive layer 41 is applied only to the joints that are not directly connected to the space containing the treatment agent 1.
Is formed, even if the fluororesin film is partially damaged by cohesive failure, the effect can be reduced. Also,
Even if the pressure-sensitive adhesive remains on the fluororesin film after the non-moisture permeable film is peeled off, the moisture permeability of the fluororesin film is hardly impaired.

In particular, when a fluororesin film having a relatively low strength such as a porous PTFE film is used, it is preferable to consider the above-described region for forming the adhesive layer.

By adjusting the area ratio between the gas permeable region and the gas non-permeable region (or the area ratio between the porous region and the non-porous region), the gas permeation characteristics per unit area in the entire wall material can be controlled. By appropriately adjusting the gas permeation characteristics, the processing time of the processing agent can be prolonged. Gas permeation characteristics of the entire wall material, considering the prolonged processing time, and displayed by the moisture permeability is preferably less than 10000 g / m ² / day, more preferably 8000 g / m ² / day or less. However, the moisture permeability is preferably 5 g / m ² / day or more in order to secure the amount of gas supplied to the treatment agent.

The fluororesin film 11 may be porous or non-porous. However, if it is necessary to increase the amount of gas per unit area of the fluororesin film, use a porous film. Is preferred. The average thickness of the fluororesin film is preferably in the range of 1 μm to 1 mm. If the average thickness is less than 1 μm, defects are likely to occur in the film, and the strength is reduced. On the other hand, when the average thickness exceeds 1 mm, the gas permeability is extremely reduced, especially when the fluororesin film is non-porous.

As the fluororesin film 11, specifically, PTFE, polytetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and the like are preferable. is there. These films generate less gas from the films and are excellent in chemical resistance as compared with other plastic films. Also,
Even with a non-porous film, permeability can be obtained for gases such as oxygen and water vapor.

When the fluororesin film is a porous film, a laminate in which the fluororesin film is laminated with a reinforcing material may be used to supplement the strength of the fluororesin film. As the reinforcing material, a material having air permeability is preferable, and for example, a nonwoven fabric, a mesh, a polyolefin porous membrane, a woven fabric, a net, and the like can be used.

In the above-mentioned composite, strength and moldability are improved by using a support material. With the miniaturization of devices such as hard disk drives and light-emitting elements, installation locations of complexes for treating impurities have also been limited. Therefore, it is required to mold the composite so as to fit inside the device. Also, in consideration of mechanization and handling at the time of incorporation into a device, it is desirable that the composite has high strength. The composite using the wall material including the support material has an advantage of easily meeting these demands.

In the above-mentioned composite, the support material may be formed in a predetermined shape in advance. FIG. 3 shows an example of a composite in which a support is formed in a box shape. In this composite, a part of the support member 22 formed as a container for accommodating the treatment agent 2 is cut out, and the fluororesin film 12 is attached to the part. If the support member 22 is appropriately formed into a predetermined shape as described above, a composite member having a shape suitable for the installation location in the device can be obtained. Also, the volume for accommodating the treatment agent 2,
The ratio of the fluororesin film 12 to the wall material can be largely changed. The shape of the composite is not particularly limited, but may be, for example, a column, a prism, a dome, or the like.

In the composite shown in FIG. 3 as well, a moisture-impermeable film 32 is attached so as to cover the fluororesin film 12. The non-moisture permeable film 32 includes the adhesive layer 4
2 is attached to the support material 22 around the fluororesin film 12. In this embodiment, since the adhesive layer 42 is not in contact with the fluororesin film, there is almost no possibility that the fluororesin film is damaged due to the formation of the adhesive layer or the peeling of the moisture-impermeable film.

The material of the support material 21 may be appropriately selected in consideration of the required strength and workability, and is not particularly limited as long as it is non-porous. A material such as a film that can be directly heat-sealed with a fluororesin film is preferable. Such materials include, for example, polyethylene terephthalate (PET),
Preferred are polybutylene terephthalate, polyacetal, polyethylene (PE), polypropylene (PP), thermoplastic elastomer and the like. In addition, the bonding between the fluororesin film and the support can be performed by an adhesive in addition to the thermal fusion. In this case, a metal material such as a stainless steel foil or an aluminum foil can be used as the support material.

The bonding between the non-porous fluororesin film and the support material can be performed by a method using a PTFE copolymer as an adhesive,
A method is preferred in which the surface of the fluororesin film to be bonded is surface-treated by sputtering, sodium treatment, or the like, and then fixed with an adhesive or a pressure-sensitive adhesive.

As the treating agent 1, if it has a function of removing at least one kind of gaseous components such as water vapor, oxygen, organic vapor and / or fine particles dispersed in a gas from the atmosphere, the type of the treating agent 1 Is not restricted. As the treating agent, an inorganic compound generally known as an adsorbent, a moisture absorbent (drying agent), a deoxidizing agent (oxygen adsorbent), or the like can be used.

Activated carbon, silica gel, activated alumina, calcium sulfate, calcium carbonate and the like can be used as an adsorbent for adsorbing (in some cases accompanied by a chemical reaction) a substance to be treated such as fine particles on the surface.

The materials exemplified above can also be used as the adsorbent for the moisture absorbent for absorbing and fixing the water vapor. Further, as the hygroscopic agent, a compound that reacts with water to generate a hydroxide, an anhydrous salt that fixes water as crystallization water, or the like may be used. Examples of the former include oxides of alkaline earth metals such as barium oxide, and examples of the latter include various sulfates and halides. Note that a non-deliquescent material is preferable as the moisture absorbent.

Activated carbon, silica gel, activated alumina, magnesium oxide, iron oxide and the like can be used as the oxygen scavenger for removing oxygen.

The treating agent may be used by mixing a plurality of the above-mentioned inorganic compounds. The treatment agent may be used as a granular material as shown in the figure, or may be formed into another form such as a pellet or a plate.

The moisture-impermeable film 31 is not particularly limited as long as it has a lower moisture permeability than the fluororesin film used in combination and can suppress gas permeation from the atmosphere to the extent that the object of the present invention can be achieved. The above-mentioned materials exemplified for the material may be used. The preferred material is PE
T, PE, PP and the like. Further, a fluororesin such as polychlorotrifluoroethylene (PCTFE) may be used. More preferred materials are metal materials such as aluminum and stainless steel, which have high barrier properties against humidity.

In order to fix the moisture-impermeable film 31 in a peelable state, it is preferable to use an adhesive. Adhesive 4
Although 1 is not particularly limited, a silicone-based, acrylic-based, or rubber-based material is preferable. In addition, when it is desired to reduce the gas generated at the time of adhesion, it is preferable to use a solvent-free radiation-curable adhesive (mainly an acrylic adhesive).

Hereinafter, a method for producing a fluororesin film will be described. The PTFE film is formed by shaping PTFE powder into a predetermined shape and then cutting, by immersing the base film in a dispersion of PTFE fine powder, coating the film to a predetermined thickness, and then firing the PTFE film. After adding an appropriate amount of an extrusion aid, a burette-like preformed body is prepared, and is extruded from a die of an extruder to form a paste-like plate-like or rod-like molded body. It can be obtained by a method of rolling and firing. Since PFA and FEP exhibit melt fluidity, they can be formed into films by melt extrusion molding.

The fluororesin film can be made porous by stretching the fired film. For example, in the case of a PTFE film, a microporous film having a maximum pore diameter of about 1 μm or less can be obtained by stretching the fired film obtained by the above-mentioned method at a predetermined temperature, although there are some differences depending on the raw materials and stretching conditions. PTFE can be made into a porous film having a higher porosity by stretching and firing. Specifically, when the paste-like molded body obtained by the above method is stretched and fired, a porous film having a higher porosity can be obtained than stretching the fired film.

The thickness of the porous PTFE film is preferably from 0.001 mm to 5 mm, and more preferably from 0.01 to 5 mm.
1 mm is preferred. Further, the porosity of the PTFE porous film is preferably from 40 to 98%.

(Second Embodiment) FIG. 4 is a sectional view of another embodiment of the fluororesin composite of the present invention. In this fluororesin composite, the fluororesin film 13 and the treating agent 3
And a layer (holding layer) 53 for holding. Also in this composite, the moisture-impermeable film 31 is bonded to the fluororesin film in a peelable state via the adhesive layer 43.

As shown in FIG. 5, the composite is used with the holding layer 53 fixed to the wall material 63 of the device. In this use state, the substance to be treated is supplied to the treatment agent 3 from the external atmosphere via the fluororesin film 13 serving as a wall material that separates from the external atmosphere.

The material of the holding layer 53 is not particularly limited as long as it has gas permeation characteristics such that a substance to be treated from an external atmosphere is supplied to the treatment agent 3.
Various adhesives and adhesives can be used. Adhesives and adhesives have a lower gas permeability than porous ceramics, but are sufficiently practical when treating a small amount of water vapor or oxygen as used in organic EL devices. .

The composite may be mechanically fixed with a screw or the like with the surface not bonded to the wall material as the surface to be fixed to the wall surface. The configuration of 53 is preferable because the fixing of the complex to the device is simplified. Also in this case, silicone-based, acrylic-based, and rubber-based materials are preferable as the adhesive. As above, if you want to reduce the gas generated during sticking,
It is preferable to use a solventless radiation-curable pressure-sensitive adhesive (mainly an acrylic pressure-sensitive adhesive).

The fluororesin film serving as a wall material separating the treatment agent from the external atmosphere may be porous or non-porous. However, in this embodiment, the treatment speed by the treatment agent is secured. If necessary, it is preferable to use a porous film such as a PTFE porous film.

The method of holding the treating agent in the holding layer is not particularly limited. As shown in FIG. 4, the particulate treating agent may be substantially uniformly dispersed in the holding layer.
As shown in (1), the treatment agents 4 and 5 may be carried so as to be exposed on the fixed surface side of the holding layers 54 and 55. The embodiment shown in FIG. 4 has an advantage that the amount of the processing agent that can be supported can be increased. In addition, in the embodiment shown in FIGS. 6 and 7, the use of a pressure-sensitive adhesive or the like in the holding layer makes it easier to carry the processing agent than in the method of dispersing the processing agent in the holding layer. In these embodiments, the separator can be temporarily attached to the adhesive surface. As the separator, a separator obtained by subjecting a film made of PE, PET, or the like to a release treatment (such as silicone coating) is preferable.

As shown in FIG. 7, in addition to the gas permeable region made of the fluororesin film 15, the gas impermeable region made of the support material 25 may be provided on the wall material. And a non-porous region made of a support material. Also in this case, similarly to the above, the moisture-impermeable film 35 is preferably attached to the support material 25 by the adhesive layer 45 so as not to contact the fluororesin film 15.

Also in the present embodiment, materials such as a fluororesin film, a support material, a treatment agent, and a moisture-impermeable film include
The materials described in the first embodiment can be used.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of an embodiment with reference to FIGS.

(Embodiment) As shown in FIG. 8, 5.0 g of silica gel 6 was housed in an aluminum case 66 having a 20 mm-diameter hole formed in the upper surface, and had a thickness of 85 μm and a porosity of 78.
% Of the PTFE porous film 16 was bonded to the upper surface of the case 66 via a polyethylene film 76 by thermal fusion. This fluororesin composite member was left in a dryer at 80 ° C. for 24 hours to desorb the adsorbed component of the silica gel.

Next, after taking out the fluororesin composite member from the dryer, a 100 μm-thick aluminum foil 36 is attached to the fluororesin composite member using a double-sided tape 46 so as to cover the entire surface of the PTFE porous film 16 immediately. Was.
Further, the fluororesin composite member to which the aluminum foil was attached was left in a constant temperature room at 25 ° C. and a 60% RH atmosphere for 7 days. After the aluminum foil 36 was peeled off and the mass was measured, the fluororesin composite member
It was put into a thermostat at 0 ° C. and 90% RH atmosphere, the mass after a predetermined time (12 hours, 24 hours, 48 hours) was measured, and the amount of moisture absorption at each time was calculated from the increase in mass.

(Comparative Example) The fluororesin composite member obtained after desorbing the silica gel adsorbed component obtained in the same manner as above was left in a constant temperature room at 25 ° C. and 60% RH for 7 days without attaching an aluminum foil. Then, the mass was measured. After measuring the weight, the fluororesin composite member
It was put into a thermostat at 0 ° C. and 90% RH atmosphere, the mass was measured after the same time as above, and the amount of moisture absorption at each time was calculated from the increase in mass.

Table 1 shows the moisture absorption. FIG. 10 shows changes in the amount of absorbed moisture.

(Table 1) (g) ――――――――――――――――――――――――――――――― Time Example Comparative Example (hr) Measurement Value Moisture absorption Measured value Moisture absorption ――――――――――――――――――――――――――――――― 0 5.52 0 5.88 0 12 6. 29 0.77 6.26 0.38 24 6.43 0.91 6.31 0.43 48 6.46 0.94 6.32 0.44 ―――――――――――――― ―――――――――――――――――

From Table 1 and FIG. 10, it can be confirmed that in the example, the moisture absorption saturates more slowly and the amount of moisture absorption is larger than in the comparative example.

[0052]

As described above, according to the present invention,
By using a moisture-impermeable film and setting the processing start time of the processing agent immediately before the start of use, even if the storage period before use is long, the processing performance is not impaired, and the life of the processing agent can be extended.
By using this fluororesin composite member, it is possible to stabilize the light emitting characteristics of various devices such as an organic EL element.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a fluororesin composite member of the present invention.

FIG. 2 is a perspective view showing an example of the fluororesin composite member of the present invention.

FIG. 3 is a cross-sectional view showing another example of the fluororesin composite member of the present invention.

FIG. 4 is a cross-sectional view showing another example of the fluororesin composite member of the present invention.

FIG. 5 is a cross-sectional view showing a use state of the fluororesin composite member shown in FIG.

FIG. 6 is a sectional view showing another example of the fluororesin composite member of the present invention.

FIG. 7 is a sectional view showing still another example of the fluororesin composite member of the present invention.

FIG. 8 is a cross-sectional view of a fluororesin composite member (before a non-moisture-permeable film is attached) manufactured in an example.

FIG. 9 is a cross-sectional view of a fluororesin composite member (after attaching a moisture-impermeable film) manufactured in an example.

FIG. 10 is a diagram showing a change in a treatment amount (moisture absorption amount) by the fluororesin composite members produced in Examples and Comparative Examples.

[Explanation of symbols]

1,2,3,4,5,6 Treatment agent 11,12,13,14,15,16 Fluororesin film 21,22,25 Support material 31,32,33,34,35,36 Non-moisture permeable film 41 , 42, 43, 44, 45, 46 Adhesive layer 53, 54, 55 Retaining layer 66 Aluminum case 76 Polyethylene film

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D012 CA01 CA09 CA10 CB03 CB08 CD01 CE02 CF04 CF08 CG01 CG06 CH01 CH05 CK05 CK07 4D020 AA02 BA04 BA08 BA30 BC01 CA02 CA05 CC07 CC08 CC14 4D052 AA00 CA04 CA06 FA01 FA03 GA03 GB03 GB11 GB HA01 HA02 HA06 HA07 HA21 HA39 HA49

Claims (9)

[Claims] 1. A treatment agent for removing at least one selected from a predetermined gas component and fine particles, and a wall material for separating the treatment agent from an external atmosphere, wherein the wall material is a fluororesin film or a fluororesin film. A fluororesin composite member having a gas permeable region made of a laminated body including the gas permeable region, wherein the gas permeable region is substantially covered with a peelable non-permeable film. 2. A treatment agent for removing at least one selected from a predetermined gas component and fine particles, and a wall material for separating the treatment agent from an external atmosphere, wherein the wall material is a fluororesin film or a fluororesin film. A fluororesin composite member, comprising: a porous region formed of a laminate containing the same; wherein the porous region is substantially covered with a peelable non-permeable film. 3. The fluororesin composite member according to claim 1, wherein the treatment agent is contained in a container formed of a wall material. 4. The fluororesin composite member according to claim 1, wherein the treatment agent is held in a layer laminated with the wall material. 5. The fluororesin composite member according to claim 4, wherein the layer holding the treating agent is an adhesive layer. 6. The fluororesin composite member according to claim 1, wherein the wall member has a gas-impermeable region, and a moisture-impermeable film is joined to the gas-impermeable region. 7. The fluororesin composite member according to claim 2, wherein the wall material has a non-porous region, and a moisture-impermeable film is bonded to the non-porous region. 8. The fluororesin composite member according to claim 1, wherein the fluororesin film is a polytetrafluoroethylene porous membrane. 9. The fluororesin composite member according to claim 1, wherein the treating agent is an inorganic compound for removing at least one selected from water vapor, oxygen, organic vapor, and fine particles.