Continuous process for the manufacture of ethylene homopolymers or ethylene copolymers
US4650841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1983 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Dec 23, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2410/01
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The process, which comprises a first stage for (co)polymerizing ethylene at 180.degree.-320.degree. C. and 300-2,500 bars in the presence of a Ziegler type catalytic system, a second stage for separation, a third stage for recycling unreacted monomers, and a fourth, recompression stage, is characterized by introducing into the stream of recycled monomer(s) during the third stage, at least one compound selected from the amides of the saturated or unsaturated organic acids containing from 12 to 22 carbon atoms, polyalkylene polyols containing from 4 to 500 carbon atoms, and compounds containing at least two epoxide functions, with a molecular weight greater than approximately 200. Preferably from 0.005 to 0.1 mole of the selected compound is introduced per ton of recycled monomer. This process makes it possible to avoid the formation of high molecular weight polymers in the recycle circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.