Process for the production of polyester
US4612363A · kind A · utility
38Cited by
7References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Sep 16, 1986 |
| 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 comprising at least 80% of an ethylene terephthalate repeating unit using as a starting material an ester compound made mainly of terephthalic acid and ethylene glycol or an oligomer thereof is disclosed. This process is characterized in that a prepolymer having an intrinsic viscosity 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 is fed to a final polymerization unit and polymerized in the form of a molten thin film having a thickness of from 0.005 to 0.15 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.