Two step polyolefin catalyst deactivation
US4156075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1977 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Aug 29, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a two step process for preparing polymeric material wherein said polymeric material is formed by polymerizing alpha-monoolefins in the presence of a halogen-containing polymerization catalyst that leaves corrosive halogen-containing catalyst residues in said polymeric material, the improvement which comprises contacting said polymeric material containing corrosive catalyst residues with steam, air and nitrogen at a temperature where the polymeric material is in a fluid or liquid state and thereafter treating said steam-air-nitrogen treated molten polymer with alumina. The polymeric material treated with the two step catalyst deactivation process had good color, low chlorides and low volatiles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.