Polymerization of ethylene or ethylene/.alpha. olefin mixtures in the presence of improved titanium/vanadium catalyst
US4483938A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1981 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Dec 30, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2410/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A solution process for the preparation of high molecular weight homopolymers of ethylene and copolymers of ethylene and C.sub.3 -C.sub.12 .alpha.-olefins is disclosed. The process involves feeding monomer, a particlar coordination catalyst and hydrocarbon solvent to a reactor, polymerizing the monomer at a temperature of 100.degree.-320.degree. C. and recovering the polymer. The catalyst is obtained by either (i) combining solutions of titanium tetrahalide/vanadium oxytrihalide and of organoaluminum compound at a temperature of less than 30.degree. C., heating the resulting admixture to a temperature of 150.degree.-300.degree. C. for a period of 5 seconds to 60 minutes and combining the thus heat-treated mixture with a solution of an organoaluminum compound or (ii) combining solutions of titanium tetrahalide and of organoaluminum compound at a temperature of less than 30.degree. C., heating the resultant admixture to a temperature of 150.degree.-300.degree. C. for a period of 5 seconds to 60 minutes, combining the thus heat-treated mixture with vanadium oxytrihalide and then combining the mixture so obtained with a solution of an organoaluminum compound. The catalyst thus obtained …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.