Process for producing propylene homopolymers and copolymers
US4053697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1975 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Jan 16, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/92
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing a homopolymer of propylene or a copolymer of propylene which comprises polymerizing propylene or a mixture of propylene and another unsaturated hydrocarbon monomer such as ethylene in liquid propylene, in the presence of a catalyst system consisting essentially of (a) an activated titanium compound obtained by reducing titanium tetrachloride with an organic aluminum compound and activating the resulting titanium compound and (b) an organic aluminum compound to produce a polymer slurry, introducing the polymer slurry into an upper part of a counter-current washing zone, such as a washing tower, and counter-currently contacting the polymer slurry with liquid propylene which is introduced into a lower part of the washing zone, whereby the polymer and catalyst residues dissolved in the polymer slurry are removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.