Increasing the particle size of as formed polyethylene or ethylene copolymer
US4105846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1977 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Aug 25, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/907
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The particle size of as formed polyethylene or ethylene copolymer containing up to about fifteen percent of a C.sub.3 to C.sub.8 olefin, which is made using a promoted solid catalyst component prepared from a magnesium alkoxide, a titanium (IV) alkoxide and an alkylaluminum dichloride, is increased by adding the dichloride in at least two stages and allowing the preparation mixture to age between stages during the preparation of said catalyst component. The particle size of polymer can be increased substantially using the so treated catalyst component, compared to the particle size of polymer made using untreated catalyst component, when either catalyst component is employed together with an alkylaluminum compound promoter in a slurry or vapor phase process at moderate polymerization temperature and pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.