PROCESS FOR THE MANUFACTURE OF FLAME-RESISTANT AND HYDROPHILIC POLYESTER FIBERS

摘要

PROCESS FOR THE MANUFACTURE OF FLAME-RESISTANT AND HYDROPHILIC POLYESTER FIBERS Polyester fibers are prepared by obtaining a polyester mass by the transesterification and subsequent polycondensation of terephthalic esters with ethylene glycol in the presence of transesterification catalysts containing metal cations, the cations being taken from the group consisting of divalent zinc, calcium, magnesium or manganese compounds. Then, the polyester mass is spinned with from 1 to 20% by weight of an oxalato complex of the general formula Men ¢Z(C2O4)m! wherein Me is an ion taken from the group consisting of Li, Na, K, Rb, Cs and NH4; Z is a complex-forming central atom taken from the group consisting of Mg, Ca, Sr, Ba, Zr, Hf, Ce, V, Cr, Mn, Fe, Co. Ni, Cu, Zn, Cd, B, Al, Ga, In, Sn, Pb, and Sb; n is ~1, ~2, ~3, or ~4; and m is ~2, ~3, or ~4, the resulting fibers are drawn; and are then hydroset at an elevated temperature in the presence of liquid water. There is icorporated into the polyester mass, prior to spinning, a compound forming a sparingly soluble salt or a complex with the cation of the transesterification catalyst.