Process for preparation of viscose regenerated cellulose fibers

Claim 1

IN A PROCESS FOR THE PREPARATION OF REGENERATED CELLULOSE FIBERS FROM VISCOSE, THE IMPROVEMENT WHICH COMPRISES PRODUCING CELLULOSE XANTHATE FROM AN ALKALI CELLULOSE HAVING A RELATIVELY HIGH DEGREE AND EVEN DISTRIBUTION OF POLYMERIZATION WHICH HAS BEEN OBTAINED BY USING PULP HAVING AN AVERAGE DEGREE OF POLYMERIZATION OF NOT LESS THAN 1200, ADDING AND DISSOLVING IN THE CELLULOSE XANTHATE AN ADDITIVE SELECTED FROM THE GROUP CONSISTING OF AN ALKYLENE OXIDE POLYMER, AN ADDUCT OF AN AMINE WITH AN ALKYLENE OXIDE, AND AN ACID AMIDE TO MAKE A VISCOSE, SAID ADDITIVE BEING ADDED IN SUCH PROPORTION THAT THE VISCOSE CONTAINS 0.15 TO 0.30 PERCENT OF THE SAME, SPINNING SAID VISCOSE AT A TEMPERATURE OF 20*C. TO 45*C. IN A FIRST SPINNING BATH CONTAINING 0.005-0.3 PERCENT OF A DIVALENT METALLIC SALT, THEREAFTER SUBJECTING THE RESULTANT FILAMENTS HAVING A REGENERATION VALUE OF 40-60 PERCENT TO TENSION IN A SECOND BATH HAVING A TEMPERATURE OF AT LEAST 80*C. AND A SULFURIC ACID CONCENTRATION OF NOT MORE THAN 1.5 PERCENT.