Gas-phase polymerization process to achieve a high particle density
US7714082B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2005 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for increasing a granular particle density of a polymeric product using at least one particle density promoting agent is described. The process includes passing a gaseous stream comprising at least one monomer through a fluidized bed reactor in the presence of a catalyst to form a polymeric product having a first granular particle density of less than or equal to about 850 kg/m3, contacting the polymeric product with at least one particle density promoting agent to increase the granular particle density of the polymeric product by at least 2%, withdrawing the polymeric product having an increased granular particle density and a recycle stream comprised of unreacted monomers, and cooling and reintroducing the recycle stream into the fluidized bed reactor with sufficient additional monomer to replace the monomer polymerized and withdrawn as the polymeric product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.