Remote fluorination of fibrous filter webs

A method of making a fluorinated fibrous web, which method includes providing a nonwoven web (22) that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location (14), and contacting the nonwoven web with products from the plasma at a second location (26) remote fr...

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Bibliographic Details
Main Authors KIRK, SETH M, CHEN, ANDREW W, SAGER, PATRICK J, PACHUTA, STEVEN J, KLINZING, WILLIAM P, JONES, MARVIN E
Format Patent
LanguageEnglish
Published 03.11.2011
Subjects
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Summary:A method of making a fluorinated fibrous web, which method includes providing a nonwoven web (22) that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location (14), and contacting the nonwoven web with products from the plasma at a second location (26) remote from the first location (14). The method avoids exposure of the web to the plasma and hence expands the manufacturing processing window. Webs so fluorinated have a different CFH to CF ratio when compared to locally fluorinated webs having similar levels of surface fluorination. The remote fluorinated webs can be subsequently charged electrically to provide a good performing electret filter (40) suitable for use in an air purifying respirator (30). Webs fluorinated in accordance with this invention also may exhibit good performance even after being "aged" at high temperatures.
Bibliography:Application Number: AU20100232752