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WO1999027003A1 - Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine - Google Patents

Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine Download PDF

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Publication number
WO1999027003A1
WO1999027003A1 PCT/JP1997/004249 JP9704249W WO9927003A1 WO 1999027003 A1 WO1999027003 A1 WO 1999027003A1 JP 9704249 W JP9704249 W JP 9704249W WO 9927003 A1 WO9927003 A1 WO 9927003A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyvinyl acetal
acetal resin
oxygen
cleanliness
purity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1997/004249
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English (en)
Japanese (ja)
Inventor
Jun Inoue
Yasuoki Sasaki
Megumi Tanno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kanebo Ltd
Aion Co Ltd
Original Assignee
Kanebo Ltd
Aion Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kanebo Ltd, Aion Co Ltd filed Critical Kanebo Ltd
Priority to DE69735412T priority Critical patent/DE69735412T2/de
Priority to PCT/JP1997/004249 priority patent/WO1999027003A1/fr
Priority to EP97913421A priority patent/EP1035157B1/fr
Priority to AU50663/98A priority patent/AU5066398A/en
Publication of WO1999027003A1 publication Critical patent/WO1999027003A1/fr
Anticipated expiration legal-status Critical
Priority to US11/144,859 priority patent/US7337592B2/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges

Definitions

  • the present invention relates to a high-purity porous polyvinyl acetal resin, a method for producing the same, and a method for storing the same.
  • the present invention relates to a polyvinyl acetal resin porous material, and a method for producing and storing the same, which is free from contamination by organic substances, dissolved ions, and particulate matter.
  • the porous material is free from contaminants and residues due to free substances of polyvinyl alcohol, which is an auxiliary material and a main material, and chemicals added for the purpose of sterilization and fungicide of the polyvinyl acetate resin porous material. It relates to a method for producing and storing a body in a wet state. Background art
  • Porous polyvinyl acetal resin is well known as a material having excellent water absorbency and water retention and preferable softness and resilience when wet. Utilizing such properties, polyvinyl acetal resin porous materials are widely used as the most suitable material for cleaning tools, cleaning materials and the like. In particular, it has been used in many industrial applications because it is hydrophilic and has excellent cleaning ability, yet it is hard to damage the rubbing object and has excellent strength. It plays an important role in cleaning applications in clean rooms, cleaning for semiconductors and electronic components, and as a member for water absorption.
  • the polyvinyl acetal resin porous body is also called a polyvinyl acetal sponge, and is hereinafter abbreviated as “PV At sponge”.
  • PVA t sponge is a powerful material that is the best material for cleaning applications in clean rooms, etc.PVA t sponge hardens when dried, and has the property of losing its flexibility and elasticity. To be effective, it is generally necessary to use it in a wet state.
  • the water absorption rate of the PVAt porous material has a large difference between the dry state and the wet state, and the water absorption rate in the dry state is significantly higher than that in the wet state. It is slow.
  • a problem in the storage method of such PVAt sponge is contamination of the porous body by organic substances, ionic substances, fine particles, microorganisms, and the like. Must be reduced to the limit.
  • a conventional method of preserving a PVAt sponge a method of impregnating and adhering a product having a fungicidal and bactericidal property to a product is generally performed. For example, aqueous solutions of sodium dehydroacetate, 4,1-methyl 3,5-dimethylphenol, benzalkonium chloride, and benzimidazole are used.
  • PVA t sponge when used in applications such as semiconductor-related cleaning materials ⁇ electronic-related water absorbing materials, for example, precision cleaning of silicon wafers, photomasks, cleaning of printed circuit boards, lead frames, etc.
  • contaminants eluted from the PVA t sponge When used for water absorption, contaminants eluted from the PVA t sponge not only degrade the quality of the product, but also contaminate the production system and the environment itself, causing serious damage.
  • contaminants eluted from the PVA t sponge when used in a clean room or in a highly clean and controlled environment, It is required to extremely reduce contaminants generated from the porous body, and the storage method using the above-mentioned chemicals has not been able to satisfy these requirements.
  • an object of the present invention is to provide a high cleanness PVA t sponge and a method for producing the same, and a high cleanliness.
  • An object of the present invention is to provide a storage method that can maintain the purity of a PVA t sponge with high accuracy and that is very easy to handle. Disclosure of the invention
  • the present invention relates to a high-purity PVA t sponge and a high-purity PVA t sponge that is washed with pure water from which impurities such as particles, ions, and organic substances dissolved and suspended in water are removed.
  • the method is characterized in that the whole of the high-purity PVA t sponge thus manufactured is hermetically sealed with an oxygen-blocking film, and the oxygen absorbent is contained in the sealed bag. Things.
  • the high cleanliness PVA t sponge of the present invention has a COD value as cleanliness of 5 pm or less, and further has a conductivity of 5 S / cm or less, and a particle number of 2.5 m or less particles of 5 m or less. It is characterized in that the number is not more than 0000 / cc.
  • the use of the high-cleanliness sponge of the present invention shortens the pre-treatment that was conventionally required, such as pre-cleaning sufficiently to prevent impurities from being eluted, when used in the cleaning process in a clean room. Or it can be omitted. Furthermore, higher cleanliness enables use under harsh environmental conditions such as semiconductor manufacturing processes.
  • the PVA t sponge is washed with pure water from which impurities such as particles, ions, and organic substances dissolved or suspended in water are removed.
  • the conductivity of pure water used for the method is 0.1 / LL Scm or less and the COD value is 1 ppm or less.
  • the cleaning with pure water is performed in an environment in which the degree of cleanliness is higher than the class 100 defined by the US Federal Standard FS209D.
  • a high purity PV At sponge can be manufactured. Furthermore, by increasing the cleanliness of pure water used in the production, it is possible to produce a high-purity PVAt sponge that can be used even under severe environmental conditions such as a semiconductor production process.
  • PVA t sponge manufactured with high cleanliness is hermetically packaged with an oxygen barrier film, and an oxygen absorbent is built into the sealed packaging bag. It is characterized by doing.
  • the high cleanliness PV At sponge is stored together with an oxygen absorbent in a sealed package having an oxygen barrier property so that the inside of the sealed package is in an oxygen-free state or an oxygen-free state.
  • the oxygen barrier film has an oxygen permeability of 200 cc / m 2 ⁇ atm ⁇ 24 hr or less.
  • an oxygen detecting agent in the hermetically sealed package. According to such a packaging method, the presence of oxygen in the package can be detected if the package is partially torn or loses hermeticity, and a defective product is used by mistake. Can be prevented beforehand.
  • a high-purity PVA t sponge is hermetically packaged, and then irradiated with an electron beam or an a-ray. .
  • an antifungal agent it is not necessary to use an antifungal agent, and the cleanliness of the PVAt sponge can be maintained with high precision.
  • the packaging for preservation only needs to be hermetically sealed.
  • the irradiation dose of the electron beam or the X-ray irradiation is set to lO k Gy or less, the change in the physical properties of the sponge can be extremely suppressed.
  • the irradiation dose increases, for example, the compressive stress increases, that is, the sponge becomes hard.
  • the oxygen concentration in the sealed package when performing electron beam or a-beam irradiation, it is preferable to reduce the oxygen concentration in the sealed package. This is because irradiation with an electron beam or an ⁇ -ray activates oxygen, and the activated oxygen may deteriorate the sponge. Therefore, airtight packaging with an oxygen barrier film is used, and an oxygen absorbent is incorporated in the airtight packaging. Furthermore, the oxygen permeability of the oxygen barrier film should be 200 cc / m 2 ⁇ atm • 24 hr or less. Is preferred. By doing so, the oxygen concentration in the sealed package can be kept extremely low, and the change in the physical properties of the sponge can be further reduced. Can be .
  • the package when the package is hermetically sealed, it is preferable to cover the sheet with a sheet molding in advance.
  • the oxygen absorbent can prevent the high-purity PVAt sponge from being deformed even if the inside of the package is under reduced pressure. In addition, deformation due to external pressure can be prevented.
  • the hermetically sealed package is further covered with a film material and sealed, and then double-wrapped. In this way, if only the exterior is discarded at the time of use, contamination of the use environment can be further reduced.
  • PVA t sponge is often used for cleaning in clean rooms, cleaning for semiconductors and electronic components, and as a water absorption member. It is useful to apply the high-cleanliness PV At sponge of the present invention and its manufacturing method and storage method to a certain cleaning sponge roller.
  • pure water used in the method of the present invention has a conductivity at 25 ° C of 0.1 S./cm or less, a total organic carbon content of 1 ppm or less, and 0.3 Z It is preferable that the water quality is such that the number of particles is 100 or less per ml and the number of viable bacteria is 10 or less Zm1, and the conductivity at 25 ° C is 0.055 / ml. It is preferable to have water quality such that i SZcm or less, total organic carbon content is 1 PPm or less, one or more particles of 0.1 or more are 1 Zm1 or less, and the number of bacteria is 0.01 or less / m1.
  • Ultrapure water of such quality can be applied to general filtration, microfiltration membrane, ultrafiltration membrane, reverse osmosis membrane, dialysis membrane, ion exchange, etc., and can also be obtained by any combination of these. Things.
  • the cleanliness of the PVA t sponge obtained by washing using the ultrapure water described above is such that the conductivity is 5 S.cm or less, the COD value is 5 ppm or less, and the sodium ion (Na + ) Concentration is less than 1 ppm, and the number of particles less than 2.5 // m is less than 50000 Zcc. This value is applicable to the semiconductor manufacturing process.
  • the values of conductivity and sodium ion (Na +) concentration are the values of sponge-adhered water itself.
  • the COD value is a value obtained by rubbing a PVA t sponge in pure water and then measuring the pure water.
  • oxygen-barrier film used in the present invention polyvinylidene chloride, nylon, polyvinyl acetate, polyvinyl alcohol, aluminum foil, and aluminum-deposited film can be suitably used, and more preferably, oxygen permeability is 10%.
  • a film obtained by laminating several kinds of films having high oxygen barrier properties or a film obtained by combining a film of polyethylene, polyester, polypropylene or the like with the above-described oxygen barrier film is more preferable in terms of strength.
  • an oxygen-blocking film may be used as in the interior, but an oxygen-permeable film may also be used.
  • polyethylene, polypropylene, polyester, General-purpose materials such as nylon can be used.
  • the purpose of this exterior is to remove the exterior bag when transporting the PVA t sponge out of the clean room and carrying it back into the clean room if double wrapped even if the surface of the wrapper is contaminated. Just by peeping can remove the contamination and clean room can be prevented from being contaminated.
  • oxygen absorbent incorporated in the above-mentioned wrapper made of a material having high oxygen barrier properties
  • a substance which is easily oxidized chemically can be used.
  • ascorbic acid, active metal powder, sulfite and the like can be used.
  • an iron-based material is preferable in consideration of handleability, oxygen absorption speed, oxygen absorption capacity, and the like.
  • the oxygen absorbent is more effective when it is a fine powder because it has higher reactivity with oxygen, but it is necessary to prevent the oxygen absorbent from coming into direct contact with the porous material to be stored.
  • the fine powder is used by sealing the fine powder with a material having pores finer than the particle system of the oxygen absorbent fine powder and having air permeability.
  • the PVA t sponge in the package is washed immediately with pure water. Cleanliness for a long time
  • Methods for easily removing oxygen gas from the package include vacuum packaging and a method of degassing the gas inside the package and replacing it with an inert gas such as nitrogen or argon. It is more preferable to use this method together with the method because it is difficult to completely remove the oxygen generated.-
  • a reversible colorant that changes its color depending on the oxygen concentration is used. It is also effective to incorporate it in a wrapper as an oxygen detector. As a result, the oxygen concentration in the wrapper can be easily confirmed, so that more reliable product storage can be achieved.
  • the PVA t sponge which is hermetically packaged with an electron beam
  • the PVA t sponge is sterilized, and even if some oxygen is present, the generation of mold can be prevented.
  • the package only needs to be able to be sealed and does not need to be an oxygen barrier film. Therefore, packaging and packaging operations can be simplified.
  • the PVA t sponge formed by the reaction between PVA and formalin was sufficiently washed with general water to remove reaction residues, unreacted materials, additives, and the like.
  • the above-described process of immersing in pure water having the above-described water quality to mechanically bend and stretch the sponge, sufficiently squeezing out the water contained in the sponge, and absorbing the pure water again is repeated.
  • the whole is covered with an oxygen-blocking film and completely sealed.
  • an oxygen detecting agent may be incorporated at the same time, or the whole PVAt sponge may be covered with a sheet molded body, and then the whole may be covered and sealed with an oxygen barrier film.
  • these members should be positioned so that they do not come into direct contact with the PVA t sponge. More preferably, for example, it is also possible to provide a structure for fixing these members to a part of the sheet molded body.
  • the method according to the present invention is applicable not only to storage of a porous material that cures in a dry state, but also to storage of a material composed of other polymers.
  • a material composed of other polymers for example, for rubber-based materials such as NBR and SBR, and for fibrous materials such as non-woven fabrics, to prevent deterioration due to oxidation of the materials themselves, and to maintain the performance of chemicals added to them It can also be used for the purpose.
  • the porous body can be stored in a wet state for a long time.
  • the conventional pre-cleaning can be shortened or omitted when using the PV At sponge.
  • the PVAt sponge can be maintained in an oxygen-free state for a long period of time, not only the antifungal effect but also the deterioration of the porous material itself due to oxidation can be prevented. Furthermore, it can be widely used not only for porous materials and those in a wet state, but also for members that need to prevent deterioration and deterioration due to oxidation. ⁇
  • Object to be measured Sponge 100 cc in distilled water 400 cc, rubbed out 100 times, and adjusted to a total of 500 cc with tap water.
  • Measurement method Coulometric titration method: The amount of potassium permanganate when an organic substance in a liquid is oxidized with a permanganate reactor is expressed in terms of equivalent oxygen.
  • Measuring equipment Portable and quick type COD meter (HC-507) manufactured by Central Science Co., Ltd. +
  • Measurement object Sponge squeezed liquid after standing for about 3 minutes with DI water sufficiently contained in the sponge
  • Measurement method AC two-electrode method; put the electrode in the liquid and measure the electric conductivity.
  • Measuring equipment Compact conductivity meter (B-173 type) manufactured by HORIBA, Ltd. (number of particles, unit: 1,000 / cc)
  • Measurement method Light-blocking particle counter; Measures the size of each particle with a diameter of 2.5 zm or more in 10 cc of the liquid to be measured based on the voltage drop due to blocking of the halogen light. Count the quantity.
  • Measurement object Sponge squeezed liquid after standing for about 3 minutes with DI water sufficiently contained in the sponge
  • Measuring method sodium ion electrode method; Drop sample liquid on flat sensor.
  • FIG. 1 is an explanatory diagram of a storage method according to the present invention
  • FIG. 2 is an explanatory diagram showing a structure of an oxygen-barrier film used for hermetic packaging.
  • FIG. 3 is an explanatory view of a sponge nozzle in Example 1
  • FIG. 4 is an explanatory view of a state of cleaning with a brush roller in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • the present invention will be described with reference to examples, but the present invention is not limited to these examples.
  • a sponge roller 1 made of polyvinyl acetal (PVA t) (size: outer diameter 60 mm x inner diameter 30 mm x length 25 4 ran) was converted to a COD value of 1 ppm and an electrical conductivity at 25 ° C of 0. 0 6 / SZcm, 2.5 or more particles 0 water / m 1
  • PVA t polyvinyl acetal
  • the same operation was repeated with fresh pure water to wash the PV At sponge nozzle.
  • the sponge roller in a wet state is stored in a package 2 (size: 45 Ommx 170 sq.) Made of an oxygen-blocking film as shown in FIG. Inject agent 3 and oxygen detector 4 and heat seal the opening to completely seal.
  • the oxygen-blocking film used had a four-layer structure.
  • the outer layer consists of polyvinylidene chloride 5, nylon 6, polyethylene 7, and linear low-density polyethylene 8, each of which has a thickness of 5 ⁇ , 10 ⁇ , 25 ⁇ , and 60 ⁇ . there were.
  • Mitsubishi Gas Chemical Company (Ageless FX-400) was used as the oxygen absorbent, and Mitsubishi Gas Chemical Company (Ageless Eye KS) was also used as the oxygen detector.
  • the sponge roller 11 is used for precision cleaning of an aluminum disk or the like, and has a large number of protrusions 9 on the surface as shown in FIG. Then, as shown in FIG. 4, the rotation of the sponge roller 11 causes the protrusion 9 to wash the object 10 such as an aluminum disk while rubbing it in the presence of water or the like.
  • the PVA t sponge nozzle was cleaned. Next, after this washing, the sponge nozzle in a wet state is stored in a polyethylene film package (size: 45 Omm x 17 Omm), and the oxygen absorbent and the oxygen detector are not put in. Heat seal the opening and seal completely. Thereafter, the entire package was irradiated with an electron beam. The irradiation energy was 5 MeV and the irradiation dose was 4 kGy.
  • Example 1 A sponge nozzle made of PVA t (size: outer diameter 60 mm x inner diameter 30 mm x length 254 mm) was wetted with pure water as described above, but was not washed. This is stored in an oxygen-blocking film wrapper (size: 450 x 170), and the opening is heated and sealed with only the oxygen detector without the oxygen absorber. And sealed. The same oxygen barrier film as in Example 1 was used.
  • the sponge roller (outer diameter 6 Ommx inner diameter 3 Ommx length 25.4 sq.) Made of PVAt was only wet with pure water as described above, but no washing was performed. This was housed in a wrapping bag (size: 450 mm x 170 mm) made of a polyethylene film, and an oxygen absorbent and an oxygen detector were charged, and the opening was heat-sealed and completely sealed. The same oxygen absorber and oxygen detector as in Example 1 were used.
  • a sponge roller made of PVA t (size: outer diameter 60 o'clock X inner diameter 3 Ommx length 2 5 4 2 ⁇ ) was added to sodium dehydroacetate 0.3 wt% aqueous solution 3, OOO cc, and oxalic acid 0.3
  • a 1% by weight aqueous solution was immersed in a mixed solution of 3,000,000 cc to make the water content the same as in Example 1.
  • this was stored in a wrapping bag made of polyethylene film (same as in Comparative Example 2), and only the oxygen detector was enclosed without an oxygen absorber and completely sealed. The same oxygen detector as in Example 1 was used.
  • the sponge roller (size: outer diameter 60 x inner diameter 3 Omm x length 2 5 4 mm) consisting of PV At is simply wetted with the pure water described above, but not washed. This was stored in an oxygen-blocking film wrapper (size: 45 Omm x 170 concealed), the air inside the wrapper was vacuum-vacuumed, and nitrogen gas was introduced. An intellectual agent was added and completely sealed. The same oxygen barrier film as in Example 1 was used.
  • a sponge roller composed of PVAt (size: outer diameter 6 Ommx inner diameter 3 Ommx length 25.4 mm) was washed in the same manner as in Example 1. Next, after this washing, the sponge nozzle in a wet state is placed in a polyethylene film package (size: 450 mm X 1). 70), and at the same time, introduce an oxygen absorbent and an oxygen detector, heat and seal the opening, and completely seal it.
  • the same polyethylene film as in Comparative Example 2 was used
  • a sponge roller made of PV At (size: outer diameter 6 O mm x inner diameter 3 O mm x length 2 5.4 hidden) was washed in the same manner as in Example 1. Next, after this washing, the sponge roller in a wet state is stored in a polyethylene film package (size: 450 mm x 17 O mm), and only the oxygen detector is added without the oxygen absorber. The opening was heated to close and completely sealed. The same polyethylene film as in Comparative Example 2 was used.
  • Example 2 by irradiating the packed sponge nozzle with an electron beam, the generation of mold was prevented for at least 200 days as in Example 1. This is because the sponge roller is sterilized by electron beam irradiation, and even if some oxygen is present, the generation of mold can be prevented. As a result, the package only needs to be sealable, and does not need to be an oxygen barrier film. Also, packaging and packaging operations can be simplified.
  • Comparative Example 3 in Table 1 is a conventional method in which a conventional antifungal agent is added. No mold is generated, but the object of the present invention cannot be achieved.
  • the other comparative examples are methods in which the fungicide is not added, and Comparative Examples 1, 2 and 4 are not washed with pure water.
  • Comparative Example 1 since the oxygen absorbent was not contained, molds were generated by the oxygen remaining in the package.
  • Comparative Example 2 since the packaging film does not have oxygen barrier properties, if the amount of oxygen permeation exceeds the capacity of the oxygen absorbent, mold will be generated.
  • Comparative Example 4 since the air in the package was first replaced with nitrogen gas and packaged with an oxygen barrier film, the generation of mold was slower than in Comparative Examples 1 and 2. Since no absorbent is added, oxygen gradually penetrates into the package, generating mold.
  • Comparative Examples 5 and 6 are examples in which cleaning with pure water was performed. In both cases, a polyethylene film was used without using an oxygen blocking film. In Comparative Example 5, an oxygen absorbent was added, and the results were good in Comparative Examples, but not as good as in Examples. In Comparative Example 6, no oxygen absorber was added, and the result was worse than Comparative Example 5.
  • the inside of the packaging for storage must be in an oxygen-free state or a state with a low oxygen concentration close to the oxygen-free state.
  • the PV At sponge is washed with pure water and then stored in an oxygen-free state or a state having a low oxygen concentration close to the oxygen-free state.
  • the cleanliness of the roller was measured for each cleaning time.
  • the PVA t sponge roller was cut and collected by an amount equivalent to 50 m1, and this was subjected to a COD value of lp pm and an electrical conductivity of 0 at 25 ° C. 0 6 SZcm, 2.5 // immersed in 500 ml of pure water with a water quality of 0 particles / m 1 or more, and given compression and release and bending in water 100 times Later, the pure water was analyzed. The results are as shown in Table 2.
  • the eluted components are within the usable range with a short pre-washing time.
  • a long pre-cleaning time was required because cleaning with pure water was not performed.
  • Comparative Example 3 since the fungicide was eluted, the conductivity was high.
  • Example 1 the inside of the package is kept free of oxygen for a long time.
  • Example 1 the inside of the package is kept free of oxygen for a long time.
  • the comparative example there is an example in which the oxygen concentration can be kept low in a short time, but cannot be maintained for a long time.
  • Example 1 when the polyvinyl acetal sponge is stored in a wet state, it is stored in an oxygen-free state or in a state having a low oxygen concentration close to the oxygen-free state, so that the mold is generated for a long time. Can be suppressed.
  • the porous body can be maintained in an oxygen-free state for a long time, not only the antifungal effect but also the deterioration of the porous material itself due to oxidation can be prevented. Furthermore, it can be widely used for storing not only porous materials and those in a wet state, but also members that need to prevent deterioration and deterioration due to oxidation.
  • Example 2 the sponge was sterilized by electron beam irradiation. Therefore, even in an environment where oxygen was present, the mold could be prevented from being produced if the package was hermetically sealed.
  • the preservation method of the present invention is a method in which the eluate and dust from the PVA t sponge are extremely reduced, and the pretreatment such as washing can be shortened or omitted at the time of use. Even when stored, it has an antifungal effect for a long period of time and retains the porous body in an oxygen-free state, so that there is no deterioration or deterioration due to oxidation, and it is extremely useful in practical use.

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  • Packages (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

Cette invention concerne une résine d'acétal de polyvinyle poreuse qui possède un indice de propreté ne dépassant 5 ml/l en termes de COD, une conductivité électrique ne dépassant 5 νS/cm, et une quantité de particules dont la taille ne dépasse pas 2,5 νm de 50.000 par cm3. Lorsqu'elle est utilisée pour le nettoyage d'une chambre propre ou dans d'autres applications, cette résine poreuse permet de réduire ou d'éliminer les pré-traitements qui sont nécessaires en l'état actuel de la technique comme, par exemple, un traitement consistant à effectuer un prélavage suffisant de la résine poreuse afin d'éviter l'élution des impuretés.
PCT/JP1997/004249 1997-11-20 1997-11-21 Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine Ceased WO1999027003A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE69735412T DE69735412T2 (de) 1997-11-21 1997-11-21 Hochreines poröses polyvinylacetatharz, herstellungsverfahren und verfahren zur lagerung
PCT/JP1997/004249 WO1999027003A1 (fr) 1997-11-21 1997-11-21 Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine
EP97913421A EP1035157B1 (fr) 1997-11-21 1997-11-21 Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine
AU50663/98A AU5066398A (en) 1997-11-21 1997-11-21 Highly clean porous polyvinyl acetal resin, method for preparing the same, and method for storing the same
US11/144,859 US7337592B2 (en) 1997-11-20 2005-06-03 Porous poly(vinyl acetal) resin body having a high degree of cleanliness, a process of preparing the same, and a method of storing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1997/004249 WO1999027003A1 (fr) 1997-11-21 1997-11-21 Resine d'acetal de polyvinyle poreuse et d'une grande proprete, procede de fabrication et procede de stockage de cette resine

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09554839 A-371-Of-International 1997-11-21
US16785002A Continuation-In-Part 1997-11-20 2002-06-12

Publications (1)

Publication Number Publication Date
WO1999027003A1 true WO1999027003A1 (fr) 1999-06-03

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AU (1) AU5066398A (fr)
DE (1) DE69735412T2 (fr)
WO (1) WO1999027003A1 (fr)

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EP0937509A4 (fr) * 1996-11-08 2005-01-19 Aion Co Ltd Rouleau eponge pour nettoyage
JP3344556B2 (ja) * 1997-11-20 2002-11-11 アイオン株式会社 高清浄度ポリビニルアセタール樹脂多孔質体およびその保存方法
JP3806857B2 (ja) * 1998-11-26 2006-08-09 アイオン株式会社 ポリビニールアセタール系スポンジ、及び該ポリビニールアセタール系スポンジの製造方法

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JPS596974A (ja) * 1982-07-05 1984-01-14 カネボウ株式会社 洗浄方法
JPH06166713A (ja) * 1992-08-19 1994-06-14 Daiwa Kagaku Kogyo Kk 抗菌防カビ性を有するポリビニルアセタール系多孔質体の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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EP1035157A4 (fr) 2001-02-07
DE69735412D1 (de) 2006-05-04
EP1035157A1 (fr) 2000-09-13
DE69735412T2 (de) 2006-08-10
EP1035157B1 (fr) 2006-03-08
AU5066398A (en) 1999-06-15

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