High density, high molecular weight polyethylene
US5371145A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1993 |
| Grant date | Dec 6, 1994 |
| Priority date | — |
| Expiry date | Jun 8, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process comprising continuously contacting with a catalyst, under polymerization conditions, ethylene or a mixture comprising ethylene and one or more alpha-olefins in a first fluidized bed reactor and a mixture comprising ethylene and one or more alpha-olefins in a second fluidized bed reactor, the first and second reactors being connected in series, said catalyst comprising: PA1 (A) a catalyst precursor comprising: PA2 (i) a vanadium compound, which is the reaction product of PA3 (a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and PA3 (b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble; PA2 (ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) wherein each X is as defined above; each R is independently alkyl having 1 to 14 carbon atoms; and a is 1 or 2; and PA2 (iii) a silica or alumina support for said vanadium compound and modifier; PA1 (B) a cocatalyst having the formula AlR.sub.3 wherein R is as defined above; and PA1 (C) a promoter having the formula R'.sub.b CX'.sub.(4-b) wherein R' is hydrogen or an unsubstituted or halo substituted alkyl having 1 to 6 carbon atoms; X' is a halogen; and b is 0, 1, or…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.