Process for preparation and after-treatment of polyester pellets

Details Process for preparation and after-treatment of polyester pellets Process for preparation and after-treatment of polyester pellets

1992-12-03

1994-03-08

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528502, 528503, C08F 610

Patent

active

052928659

ABSTRACT:
Process for simultaneous removal of aldehyde, solid-phase postcondensation and drying of linear polyesters and copolyesters by after-treating the polyester pellets with a diffusion surface of 1.95 to 2.90 m.sup.2 /kg, an individual pellet weight of 5 to 15 mg and a bulk density of 750 to 900 kg/m.sup.3 at 140.degree. to 210.degree. C. with a flow of a dry gas mixture consisting of 60-90 vol % N.sub.2, 5-21% O.sub.2 and 0.1-25% CO.sub.2 (total 100%) at a quantity ratio of 0.5 to 2.5 kg/h gas mixture per kg/h polyester.

REFERENCES:
patent: 3840632 (1974-10-01), Maxion et al.
patent: 4223128 (1980-09-01), Halek et al.
patent: 4230819 (1980-10-01), Hauenstein et al.
patent: 4263425 (1981-04-01), Rothe et al.
patent: 4374975 (1983-02-01), Duh
patent: 4609721 (1986-09-01), Kirschenbaum et al.

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