OILY MIST RESISTANT ELECTRET ARTICLES AND FILTERS

The electret article comprises a polymer (1) and a performance enhancing chemical (2) wherein the article has a thermally stimulated discharge current (TSDC) spectrum having a peak with a width at half-height of less than 30[deg]C by test procedure 3. Independent claims are also included for the fol...

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Bibliographische Detailangaben
Hauptverfasser:	JONES, MARVIN, E, ROUSSEAU, ALAN, D, MEI, BETTY, Z
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS BASIC ELECTRIC ELEMENTS BRAIDING CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS COTTON-WOOL DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING ELECTRICITY FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS FIRE-FIGHTING FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR HUMAN NECESSITIES KNITTING LACE-MAKING LAUNDERING LIFE-SAVING MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL NATURAL OR ARTIFICIAL THREADS OR FIBRES NON-WOVEN FABRICS OUTERWEAR PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROTECTIVE GARMENTS SEPARATION SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS SPINNING TEXTILES TRANSPORTING TREATMENT OF TEXTILES OR THE LIKE TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS TRIMMINGS WADDING WEARING APPAREL
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Beschreibung
Zusammenfassung:	The electret article comprises a polymer (1) and a performance enhancing chemical (2) wherein the article has a thermally stimulated discharge current (TSDC) spectrum having a peak with a width at half-height of less than 30[deg]C by test procedure 3. Independent claims are also included for the following: (a) a non-woven web containing the electret article as melt blown fibres; (b) the electret filter comprising the non-woven web of melt blown fibres and has an initial DOP penetration of less than 5% and an average 'minium at challenge' of above 200 mg by DOP filter web loading test procedure 1; (c) a respirator containing an electret filter comprising a non-woven web comprising (1) and (2); a support structure and cup-like member to fit over the mouth and nose; and which has a 'minimum at challenge' of over 400 mg DOP and has an exposed surface area of about 180 cm 2>; (d) an intermediate composition for making an electret filter comprising the non-woven fibrous web comprising polypropylene with a crystallinity index of less than 0.3 and (2) and has a charge density of 10 mC / m 2>;.