Method to increase reactor capacity for polycondensation of polyesters
US4289871A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1980 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Mar 27, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/2609
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The improvement of passing an inert, preferably vaporizable and condensible, liquid material through or over a polyester molten mass in a polymer reactor to further increase surface area-to-volume ratio and/or lower the partial pressure of vaporous products of condensation so that viscosity of the polymer is increased at a substantially greater rate in the same residence time is taught for the prior art condensation process in a film-forming reactor at temperatures of 275.degree. C. to 300.degree. C., pressures of 0.1 to 760 Torr, and residence times of 0.1 to 6 hours. A polymer having an intrinsic viscosity above 0.65, preferably over 0.7, is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.