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US4215682: Melt-blown fibrous electrets

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Filing Information

Inventor(s) Donald A. Kubik · Charles I. Davis ·
Assignee(s) Minnesota Mining and Manufacturing Company ·
Attorney/Agent(s) Cruzan Alexander ·
Primary Examiner Henry J. Recla ·
Application Number US5875614
Filing date 02/06/1978
Issue date 08/05/1980
Predicted expiration date 02/06/1998
U.S. Classifications 128/205.29  · /551.03  ·
International Classifications A62B 710  ·
Kind CodeA
International Classifications 128146.2;146;146.6 ·
18 Claims, No Drawings


Abstract

A persistent electric charge is introduced into melt-blown fibers during the melt-blowing process. When these charged fibers are incorporated into fibrous webs, they provide unique properties, including improved filtering properties.

Independent Claims | See all claims (18)

  1. 1. A fibrous web electret comprising melt-blown fibers prepared by extruding molten fiber-forming material through orifices into a high-velocity gaseous stream where the extruded material is drawn out into fibers and solidified in the fibrous form, said fibers having electrically charged particles and a persistent electric charge that is useful to enhance filtering properties of the web, said charge having a half-life of at least one week in a room-temperature, 100-percent-relative-humidity environment.
  2. 9. A fibrous web electret comprising a coherent mass of randomly intertangled melt-blown microfibers which average less than 10 micrometers in diameter, said microfibers being prepared by extruding molten fiber-forming material through orifices into a high-velocity gaseous stream where the extruded material is drawn out into fibers and solidified in the fibrous form, said microfibers having electrically charged particles in an amount sufficient to provide a persistent electric charge of at least 10.sup.-8 coulombs per gram of said microfibers, with a half-life of at least six months in a room-temperature, 100-percent-relative-humidity environment.
  3. 16. A method for forming a melt-blown fibrous web electret comprising(1) extruding molten fiber-forming material that exhibits a volume resistivity of at least 10.sup.14 ohm-centimeters through a plurality of orifices into a high-velocity gaseous stream where the extruded material is attenuated to form a stream of fibers;(2) bombarding electrically charged particles at said stream of fibers as the fibers issue from the orifices wherein the fibers are both near the source of the electrically charged particles and are in a molten or near-molten state; and(3)collecting said fibers at a point sufficiently remote from the orifices for the fibers to have cooled to a solid fibrous shape-retaining form.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US2464301 AMERICAN VISCOSE CORP Francis, Jr. Mar 1949
US2466906 RANSBURG ELECTRO COATING CORP Miller Apr 1949
US2491889 OWENS CORNING FIBERGLASS CORP Bennett et al. Dec 1949
US2740184 THOMAS ALBERT G Thomas Apr 1956
US2810426 AMERICAN VISCOSE CORP Till et al. Oct 1957
US3003304 OLE-BENDT RASMUSSEN Rasmussen Oct 1961
US3016599 DU PONT Perry, Jr. Jan 1962
US3333585 MINNESOTA MINING & MFG Barghini et al. Aug 1967
US3456156 DU PONT Kilby et al. Jul 1969
US3490115 DU PONT Owens et al. Jan 1970
US3571679 TNO Van Turnhout Mar 1971
US3644605 BELL TELEPHONE LABOR INC Sessler et al. Feb 1972
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US3824052 DEERING MILLIKEN RES CORP Fowler Jul 1974
US3860369 DU PONT Brethauer Jan 1975
US3971373 Minnesota Mining and Manufacturing Company Braun Jul 1976
US3998916 N.V. Verto Van Turnhout Dec 1976
US4042740 Minnesota Mining and Manufacturing Company Krueger Aug 1977
US4069026 Bayer Aktiengesellschaft Simm et al. Jan 1978
US4148595 E. I. Du Pont de Nemours and Company Bednarz Apr 1979

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
GB1337753THERMO ELECTRON CORPNov 1973

Other Publications

Pillai et al., NASA Technical Report R-457, Dec. 1975.
Van Turnhout, "The Use of Polymers for Electrets", Journal of Electrostatics, vol. 1, (1975), pp. 147-163.

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