Production of ultra high melt flow polypropylene resins
US6657025B2 · kind B2 · utility
17Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Jan 11, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of preparing ultra high melt flow polypropylene having reduced xylene solubles is provided. The method utilizes a diether internal donor-containing Ziegler-Natta catalyst system to polymerize propylene. The polypropylene produced is characterized by having a melt flow of at least about 300 g/10 min and a xylene solubles of not more than about 3.5% and no peroxide residue. The catalyst system may also include an internal phthalate donor. The method of the invention allows the amount of external donors to be reduced, or even eliminated, without significant increases in xylene solubles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.