Process for spinning modified viscose solution

Claim 1

A PROCESS FOR SPINNING MODIFIED VISCOSE TO PROVIDE IMPROVED RAYON YARNS AND CORDS COMPRISING THE STEPS OF PARTIALLY XANTHATING ALKALI CELLULOSE WITH CARBON DISULFIDE IN A DRY PHASE IN THE ABSENCE OF A MONOAMINE MODIFIER TO AN ABSOLUTE SULFUR SUBSTITUTION VALUE OF AT LEAST 13%, BASED ON THE CELLULOSE CONTENT, AND A RELATIVE XANTHATE SULFUR SUBSTITUTION VALUE OF UP TO 90%, BASED ON THE ABSOLUTE VALUE OBTAINED IN THE FINAL XANTHATION; MIXING THE PARTIALLY XANTHATED ALKALI CELLULOSE WITH AQUEOUS CAUSTIC SOLUTION TO A CELLULOSE CONTENT OF 4% TO 15% AND A CELLULOSE TO CAUSTIC RATIO APPROXIMATING THAT OF THE FINAL VISCOSE SOLUTION; COMPLETING THE XANTHATION WITH CARBON DISULFIDE IN THE PRESENCE OF AT LEAST ABOUT 0.02 BUT LESS THAN 1 MILLIMOLE OF AN ORGANIC MONOAMINE MODIFIER PER 100 GRAMS OF FINAL VISCOSE SOLUTION, SAID ORGANIC MONOAMINE MODIFIER HAVING AT LEAST ONE HYDROGEN ATOM ATTACHED TO THE AMINO NITROGEN, CONTAINING AT LEAST FOUR CARBON ATOMS, HAVING A MAXIMUM OF EIGHT CARBON ATOMS IN ANY ONE RADICAL, AND BEING SOLUBLE TO THE EXTENT OF AT LEAST 0.1% IN 6% CAUSTIC SODA SOLUTION; PREPARING A VISCOSE SOLUTION CONTAINING 4% TO 10% OF CELLULOSE AND 4% TO 8% OF CAUSTIC FROM THE MODIFIED CELLULOSE XANTHATE MIXTURE; AND SPINNING THE MODIFIED VISCOSE SOLUTION INTO A SPINNING BATH CONTAINING 4% TO 12% TO SULFURIC ACID, ABOUT 13% TO 25% SODIUM SULFATE, 2% TO 15% ZINC SULFATE AND LESS THAN 200 PARTS PER MILLION OF COMBINED NITROGEN AT 40*-80*C.