Dry jet wet spinning process

Abstract

Abstract THE PROCESS OF EXTRUDING A SPINNING DOPE FROM AN ORIFICE THROUGH A LAYER OF FLUID INTO A COAGULATING BATH, SAID DOPE COMPRISING A POLYAMIDE IN A SOLVENT CONSISTING ESSENTIALLY OF SULFURIC ACID OF AT LEAST 98% CONCENTRATION, CHLOROSULFURIC ACID OR FLUOROSULFURIC ACID OR MIXTURES THEREOF AT A CONCENTRATION (C) OF AT LEAST 30 GRAMS OF SAID POLYAMIDE PER 100 ML. OR SOLVENT, THE SAID POLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 2.0 BUT NO LESS THAN (2.8-.05 (C-30) AND CONSISTING ESSENTIALLY OF RECURRING UNITS SELECTED FORM THE GROUP; -CO-(R)N-CO-, -NH-R''-NH-, AND -CO-R"-NH- WHEREIN UNITS I AND II, IF PRESENT IN THE POLYAMIDE ARE PRESENT IN SUBSTANTIALLY EQUIMOLAR AMOUNTS, R, R'' AND R" WHICH MAY BE TEH SAME OR DIFFERENT, ARE DIVALENT RADICALS, N MAY BE ZERO OR THE INTEGER ONE, AND AT LEAST ABOUT 95 MOL PERCENT OF THE TOTAL R, R'' AND R" RADICALS IN THE POLYAMIDE CONSIST OF SINGLE RIGID RADICALS WITH EXTENDED BONDS OR A SERIES OF SUCH RIGID RADICALS WHICH ARE LINKED TOGETHER DIRECTLY BY EXTENDED BONDS WITH THE PROVISO THAT RIGID RING RADICALS MAY BE LINKED BY AZO OR AZOXY GROUPS.

Inventors

• 👤 H Blades

Bibliographic Details