Polymerization catalyst system using di-sec-butyldimethoxysilane for preparation of polypropylene
US7163905B2 · kind B2 · utility
1Cited by
22References
7Claims
0Family size
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Inventor
Key dates
| Filing date | Feb 22, 2006 |
| Grant date | Jan 16, 2007 |
| Priority date | — |
| Expiry date | Feb 22, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/52
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
It has been discovered that using di-sec-butyldialkoxysilanes, such as di-sec-butyldimethoxysilane (DSBDMS), as external electron donors for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties and processing. The catalyst systems of the invention provide high activity, high bulk density, moderate hydrogen response, moderate donor response and high polydispersity (MWD). Suitable di-sec-butyldialkoxysilanes have the formula (sBu)2Si(OR″)2, where R″ is independently a straight or branched alkyl group of 1–5 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.