Nonwoven fabric in an electret state and process for its...

Details Nonwoven fabric in an electret state and process for its... Nonwoven fabric in an electret state and process for its...

B - Operations, Transporting

03

C

B03C 3/28 (2006.01) B01D 39/16 (2006.01) D04H 1/56 (2006.01)

Patent

CA 2108613

ABSTRACT The improved nonwoven fabric in an electret state is composed of monofilaments with an average fiber diameter of 0.5 - 100 µm that are formed of a polymer composition containing no more than 1 mol% of polar groups; the fabric has a weight of 5 - 100 g/m2, a bulk density of 0.05 - 0.40 g/cm3 and an average surface charge density of at least 0.1 x 10-9 C/cm2. This nonwoven fabric is capable of efficient dust collection and its trapping ability is retained for a prolonged time even in a hot and humid condition. Also disclosed are a process for producing this nonwoven fabric, as well as a filtering and an air masking material which are composed of that nonwoven fabric.

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