Method for producing ethylene homopolymers and copolymers by means of radical high pressure polymerization
US6894126B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2002 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Jun 8, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a process for preparing ethylene homopolymers and ethylene copolymers in a tube reactor at pressures above 1000 bar and temperatures in the range from 120 to 400° C. by free-radical addition polymerization, in which first small amounts of free-radical chain initiator are supplied to a streaming flow medium comprising ethylene, molar mass regulator, and, if desired, polyethylene, after which the polymerization takes place. The invention takes place at a pressure in the range from 2000 to 3500 bar and comprises reaction mixture within the tube reactor passing through a temperature profile in the range from 100 to 350° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.