THERMAL BLEACHING PROCESS FOR NON-CONTAMINATING FLUOROCARBON FIBER MEDIUM

Title:

THERMAL BLEACHING PROCESS FOR NON-CONTAMINATING FLUOROCARBON FIBER MEDIUM

Document Type and Number:

Japanese Patent JPH0665857

Kind Code:

A

Abstract:

PURPOSE: To obtain a non-contaminating fluorocarbon fiber filter which is substantially permanently whitened.

CONSTITUTION: This process for reducing the level of extractables, whitening, and rendering a porous material non-contaminating, where the porous material is comprised of bonded fluorocarbon fibers and a fluorocarbon chemical binder. The thermal bleaching process includes exposing the material for at least several hours to a vigorously agitated oxygen-containing atmosphere maintained at a temperature of at least about 204°C.

Inventors:

JIYOSEFU JII ADEIRETSUTA
JIYON ERU HAAREE
SANDORA ERU BUROSHIASU

Application Number:

JP8206393A

Publication Date:

March 08, 1994

Filing Date:

April 08, 1993

Export Citation:

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Assignee:

PALL CORP

International Classes:

B01D39/08; D06L3/02; B01D39/16; (IPC1-7): D06L3/02

Attorney, Agent or Firm:

Kyozo Yuasa (6 people outside)

Next Patent: PRODUCTION OF SURFACE-MODIFIED CARBON FIBER