Continuous process for drying, crystallizing and solid state pol

Details Continuous process for drying, crystallizing and solid state pol Continuous process for drying, crystallizing and solid state pol

1973-11-12

1976-07-13

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75M, 260 75R, C08G 6346

Patent

active

039693244

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.

REFERENCES:
patent: 3014011 (1961-12-01), Zoetbrood
patent: 3535285 (1970-10-01), Breiner et al.
patent: 3544523 (1970-12-01), Maxion
patent: 3544525 (1970-12-01), Balint et al.
patent: 3586647 (1971-06-01), Kremer
patent: 3634359 (1972-01-01), Breitschaft et al.
patent: 3657388 (1972-04-01), Schweizer et al.

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