Process for the production of polyester
US4647650A · kind A · utility
26Cited by
7References
7Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Nov 19, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the production of polyester is disclosed, comprising feeding an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof to a final polymerization reactor, and then polymerizing it in the form of fine molten particles in an inert gas stream, wherein the ester compound has an intrinsic viscosity [.eta.] of not more than 0.4 dl/g and a carboxyl terminal group concentration [COOH] of not more than 90.times.[.eta.].sup.-0.4 .mu.eq/g, and the fine particles have an average particle diameter of from 0.015 to 0.5 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.