Gas filtration media and method of making the same

Details Gas filtration media and method of making the same Gas filtration media and method of making the same

1998-11-03

2000-08-29

Simmons, David A.

Gas separation

Specific media material

Fibrous or strand form

55528, 55DIG5, 55DIG39, 2642103, 2642104, 264169, B03C 328

Patent

active

061102512

ABSTRACT:
An improved gas filtration media with a lower initial pressure drop and increased dirt holding capacity includes a fibrous mat of randomly oriented meltblown polymeric fibers made from a polymer with between 0.2% and 10.0% by weight of: a) a nucleating agent to increase the rate of crystallization of the polymer forming the fibers and improve the heat sealability of media made from the fibers and/or b) an electrostatic charging enhancer to reduce surface tension of the polymer and inter-fiber attraction, as the fibers are cooled during formation and collection the fibers, to thereby facilitate the formation of the fibrous mat with discrete fibers. Preferably, the polymer is polypropylene, the nucleating agent is bis-benzylidene sorbitol, and electrostatic charging enhancer is a fatty acid.

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patent: 5645627 (1997-07-01), Lifshutz et al.
patent: 5730885 (1998-03-01), Blakeslee et al.

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