Verfahren zur Herstellung von Polyester-Harzen als Fasernmaterial

摘要

PCT No. PCT/EP93/01447 Sec. 371 Date Apr. 11, 1994 Sec. 102(e) Date Apr. 11, 1994 PCT Filed Jun. 11, 1993 PCT Pub. No. WO93/25600 PCT Pub. Date Dec. 23, 1993Process for the production of polyester resins suitable for the manufacture of fibers including a phase of esterification of an aromatic dicarboxylic acid with an alkylenic glycol or of transesterification of a diester of the dicarboxylic acid with the alkylenic glycol, of polycondensation of diester obtained to form a prepolymer with intrinsic viscosity between 0.2 and 0.5 dl/g and, lastly, of polycondensation of the melt polymeric mass added with a dianhydride of a tetracarboxylic acid kept in agitation and on which an inert gas current is circulated.