Polymerization catalyst system using n-butylmethyldimethoxysilane for preparation of polypropylene film grade resins
US6657024B1 · kind B1 · utility
10Cited by
20References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Sep 3, 2022 |
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.