Process for purifying rubbery polymers
US4581431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Sep 18, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for purifying a rubbery polymer by removing a catalyst residue from a rubbery polymer containing the catalyst residue obtained by polymerizing in slurry ethylene and an .alpha.-olefin or ethylene, an .alpha.-olefin and a non-conjugated diene in a poor solvent with a catalyst consisting of an organoaluminum compound and a transition metal compound, characterized in that the removal of the catalyst residue is conducted by water extraction consisting of PA0 (1) adding a good solvent and a surface active agent to the polymer slurry in the first step, and PA0 (2) adding water to the slurry obtained in above (1) in second step. This process enables the catalyst residue to be removed from EPDM in a very high efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.