초록 ▼

Novel electret articles containing a polymer and a performance-enhancing additive can be identified by their thermally stimulated conductivity characteristics or their filtration properties. Electret articles such as nonwoven filter webs and respirators exhibit superior oily mist loading performance

Novel electret articles containing a polymer and a performance-enhancing additive can be identified by their thermally stimulated conductivity characteristics or their filtration properties. Electret articles such as nonwoven filter webs and respirators exhibit superior oily mist loading performance, low penetration and a small pressure drop.

대표청구항 ▼

[ What is claimed:] [1.]1. An electret article that comprises a polymer and a performance-enhancing additive, wherein the article has a thermally stimulated discharge current (TSDC) spectrum exhibiting a peak having a width at half height of less than about 30.degree. C., as measured by TSDC test pr

[ What is claimed:] [1.]1. An electret article that comprises a polymer and a performance-enhancing additive, wherein the article has a thermally stimulated discharge current (TSDC) spectrum exhibiting a peak having a width at half height of less than about 30.degree. C., as measured by TSDC test procedure 3. [22.]22. An intermediate composition for making an electret filter, the composition comprising a nonwoven web of fibers comprised of polypropylene having a crystallinity index of less than 0.3 as measured by the ratio of crystalline peak intensity to total scattered intensity over the 6 to 36 degree scattering angle range, and a fluorochemical performance-enhancing additive.