Inventors:
Eugene E. Berkau - Cincinnati OH
Cecil W. Capps - Raleigh NC
Assignee:
Monsanto Company - St. Louis MO
International Classification:
C08G 6346
Abstract:
A continuous process is provided for the drying, crystallizing and solid state polymerization of fiber-forming crystallizable polyesters by subjecting polyester pellets of a specific viscosity of about 0. 34, with a carboxyl concentration of about 15 milequivalents per gram and a particle size of between -10 and +20 mesh, to a temperature of not more than about 80. degree. C. until the water content of the flake is below 0. 05%; and then raising the temperature to about 230. degree. -240. degree. C. until the specific viscosity of the polymer is equal to or greater than about 0. 55.