Aziz Ahmed Mian

US Patent:

49632981, Oct 16, 1990

Filed:

Feb 1, 1989

Appl. No.:

7/304461

Inventors:

Steven R. Allen - Wilmington DE
Aziz A. Mian - Wilmington DE
Sam L. Samuels - Claymont DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

D01D 511

US Classification:

264 12

Abstract:

Process for preparing subdenier fiber and structures thereof from lyotropic liquid crystalline polymers comprising extruding a stream of the polymer into a chamber, introducing a pressurized gas into the chamber, directing the gas in the flow direction of and in surrounding contact with the stream within the chamber, passing both the gas and the stream into a zoner of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and contacting the fragmented stream in the zone with a coagulating fluid.

US Patent:

52962865, Mar 22, 1994

Filed:

Jan 11, 1993

Appl. No.:

7/961704

Inventors:

Steven R. Allen - Midlothian VA
David M. Gale - Wilmington DE
Aziz A. Mian - Wilmington DE
Sam L. Samuels - Claymont DE
Hsiang Shih - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

D03D 300

US Classification:

428224

Abstract:

A process for preparing subdenier fibers and structures thereof from isotropic polymer solutions is disclosed. The process comprises extruding a stream of the polymer solution into a chamber, introducing a pressurized gas into the chamber, directing the gas in the flow direction of and in surrounding contact with the stream within the chamber, passing both the gas and the stream into a zone of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and contacting the fragmented stream in the zone with a coagulating fluid.