Polymerization catalyst system using n-butylmethyldimethoxysilane for preparation of polypropylene film grade resins
US7202191B2 · kind B2 · utility
1Cited by
2References
6Claims
0Family size
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Key dates
| Filing date | Oct 4, 2005 |
| Grant date | Apr 10, 2007 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
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 n-butylmethyldimethoxysilane (BMDS) as an external electron donor for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties. The catalyst systems of the invention provide for controlled chain defects/defect distribution and thus a regulated microtacticity. Consequently, the curve of storage modulus (G′) v. temperature is shifted such that the film achieves the same storage modulus at a lower temperature enabling faster throughput of polypropylene film through a high-speed tenter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.