Claims
- 1. An air filter for trapping air-born particles, comprising:
- a filter medium formed into a fiber layer by treating fibers with a treatment agent, wherein the treatment agent comprises a water repellent agent having a main component selected from the group consisting of aliphatic hydrocarbons having 20 carbon atoms or more, and higher alcohols having 18 carbon atoms or more;
- a frame containing the filter medium; and
- a sealing material firmly sealing the frame and the filter medium;
- wherein the filter medium and the sealing material substantially do not release gaseous organic substances.
- 2. The air filter as defined in claim 1, wherein the water repellent agent has a main component selected from the group consisting of microcrystalline waxes, natural paraffin, synthetic paraffin, polyolefin waxes, branched alcohols having 18, 20 and 24 carbon atoms, and oleyl alcohol.
- 3. The air filter as defined in claim 1, wherein the sealing material includes a lubricant having a main component selected from the group consisting of microcrystalline waxes, natural paraffin, synthetic paraffin, polyolefin waxes, branched alcohols having 18, 20 and 24 carbon atoms, and oleyl alcohol.
- 4. The air filter as defined in claim 1, wherein the sealing material comprises a two component polyurethane resin formed by reaction of a main agent comprising an isocyanate and a curing agent, and the equivalent amount of active hydrogen in the curing agent is greater than the equivalent amount of the isocyanate group in the main agent, and contains no phosphoric acid ester.
- 5. The air filter as defined in claim 1 wherein the filter medium does not release gaseous organic substances more than about 10 .mu.g/g-sample measured by dynamic headspace-gas chromatography/mass spectroscopy at 150.degree. C. for 30 minutes; and wherein the sealing material does not release gaseous organic substances more than about 50 .mu.g/g-sample measured by dynamic headspace-gas chromatography/mass spectroscopy at 150.degree. C. for 30 minutes.
- 6. An air filter for trapping air-born particles comprising:
- a filter medium formed into a fiber layer by treating fibers with a treatment agent, wherein the treatment agent comprises an antioxidant having a main component selected from the group consisting of phenolic compounds having molecular weights of 300 or more;
- a frame containing the filter medium; and
- a sealing material firmly sealing the frame and the filter medium;
- wherein the filter medium and the sealing material substantially do not release gaseous organic substances.
- 7. The air filter as defined in claim 6, wherein the antioxidant main component is selected from the group consisting of stearyl-.beta.-(3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2'-methylene-bis (4-methyl-6-t-butylphenol), 2,2'-methylene-bis (4-ethyl-6-6-butylphenol), 4,4'-thiobis (3-methyl-6-t-butylphenol), 4,4'-butylidene-bis (3-methyl-6-t-butylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl) benzene, tetrakis (methylene-3-(3',5'-di-t-butyl-4'-hydroxyphenyl) propionate) methane, bis (3,3'-bis (4'-hydroxy-3'-t-butylphenyl) butyric acid) glycol ester, and tocophenol.
- 8. The air filter as defined in claim 6 wherein the filter medium does not release gaseous organic substances more than about 10 .mu.g/g-sample measured by dynamic headspace-gas chromatography/mass spectroscopy at 150.degree. C. for 30 minutes; and wherein the sealing material does not release gaseous organic substances more than about 50 .mu.g/g-sample measured by dynamic headspace-gas chromatography/mass spectroscopy at 150.degree. C. for 30 minutes.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7-192090 |
Jul 1995 |
JPX |
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CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of U.S. Ser. No. 08/817,007, filed Mar. 27, 1997, now U.S. Pat. No. 5,997,598, which was filed under 35 U.S.C. 371 as the national stage application of PCT/JP96/02076, filed Jul. 25, 1996, and published as WO97/04851 on Feb. 13, 1997.
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Divisions (1)
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Number |
Date |
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Parent |
817007 |
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