Filter felts and bag filters comprising blends of fibers...

Details Filter felts and bag filters comprising blends of fibers... Filter felts and bag filters comprising blends of fibers...

2007-08-22

2010-10-26

Griffin, Walter D (Department: 1797)

Gas separation

Specific media material

Fibrous or strand form

C055S528000, C442S411000

Reexamination Certificate

active

07819936

ABSTRACT:
This invention relates to a filter felt and bag filters comprising an intimate staple fiber blend of 20 to 75 parts by weight polymeric staple fiber containing a polymer or copolymer derived from a monomer selected from the group consisting of 4,4′diaminodiphenyl sulfone, 3,3′diaminodiphenyl sulfone, and mixtures thereof; and 25 to 80 parts by weight of a heat resistant staple fiber selected from the group consisting on meta-aramid fiber, acrylic fiber, polyphenylene sulfide fiber, and para-aramid fiber; based on 100 parts by weight of the polymeric fibers and heat resistant fibers in the felt.

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