United States Patent (19) 11 Patent Number: 4,814,228 Onorato Et Al
United States Patent (19) 11 Patent Number: 4,814,228 Onorato et al. (45) Date of Patent: Mar. 21, 1989 (54) WET SPUN HYDROXYETHYLATED (56) References Cited POLYBENZMIDAZOLE FIBERS U.S. PATENT DOCUMENTS (75) Inventors: Frank J. Onorato, Phillipsburg; 3,851,025 11/1974 Ram .................................... 264/184 Michael J. Sansone, Berkeley 4,599,388 7/1986 Bower et al. ... ... 525/433 Heights; Arthur Schlask, Roselle 4,734,466 3/1988 Kindler et al....................... 525/433 Park, all of N.J. Primary Examiner-Lorraine T. Kendell Attorney, Agent, or Firm-Lynch, Cox, Gilman & 73 Assignee: Hoechst Celanese Corporation, Mahan Somerville, N.J. 57) ABSTRACT 21 Hydroxyethylated polybenzimidazole fibers are pro Appl. No.: 28,354 duced by a wet jet/wet spinning or by a dry jet/wet spinning process. A spinning solution of hydroxye 22 Filed: Mar. 20, 1987 thylated polybenzimidazole is extruded vertically downward through a spinneret into a liquid coagulation (51) Int. Cl." ............................................... D02G 3/00 bath. The resulting fibers have pore sizes ranging from (52) U.S. Cl. ............................... 428/398; 210/500.28; about 5 angstroms up to about 100 angstroms and are 210/500.23; 264/41; 264/183; 264/184; quite useful as ultra filters for molecules with a broad 264/210.8; 428/376 range of molecular weight. 58 Field of Search ............... 428/364, 392,397, 398, 428/376; 264/183, 184, 41,210.8; 210/500.28 17 Claims, No Drawings 4,814,228 1. 2 ample, such polybenzimidazole polymers as poly WET SPUN HYDROXYETHYLATED 2,2'(m-phenylene)-5,5'-bibenzinidazole and other simi POLYBENZMDAZOLE FIBERS larly structured polybenzimidazole polymers may not be used because the bridging groups between the reac BACKGROUND OF INVENTION 5 tive imidazole rings are sterically hindered, thereby 1.
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