Patent ID: 6383433
Filing Date: 2002-05-07
Classification: C08G,D01F,Y10T

Abstract:
A process for producing a copolyester fiber, the process comprising fiber esterification, precondensation and polycondensation of terephthalic acid with C2-4 alkylene glycol, poly(C2-4 alkylene glycol), and a polyfunctional compound and spinning in the melt of the resulting copolyester at spooling speeds of at least 3000 m/min, wherein more than 4 wt % up to 12 wt % poly(C2-4 alkylene glycol) with a number average molecular weight between 200 and 3000 g/mol, and as polyfunctional compound 60 to 260 ppm pentaerythritol, and/or a total of 150 to less than 2500 ppm carboxy methylene phosphonic acid and/or carboxy ethylene phosphonic acid are added to the reaction mixture before precondensation.