Claims
- 1. The process which comprises preparing a catalyst-free low molecular weight polyester having an intrinsic viscosity of from 0.1 to 0.4 by reacting ethylene glycol with terephthalic acid in the presence of catalyst-free low molecular weight polyester, grinding or otherwise reducing the particle size of the low polymer to 20 mesh or less to form low molecular weight polyester have a free carboxyl content of less than 25 equivalents per 10.sup.6 grams of polymer and subjecting the low molecular weight polyester thus prepared to solid state polymerization in fluid bed or static bed process to form high molecular weight polyester.
Parent Case Info
This application is a continuation-in-part of my Application Ser. No. 877,455, filed Feb. 13, 1978.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3330809 |
Perlowski et al. |
Jul 1967 |
|
3475379 |
Hilaire |
Oct 1969 |
|
3497477 |
Barkey et al. |
Feb 1970 |
|
3594350 |
Lofquist et al. |
Jul 1971 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
877455 |
Feb 1978 |
|