Polymer control through co-catalyst
US6825293B1 · kind B1 · utility
7Cited by
11References
58Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 20, 2001 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Nov 29, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Some properties such as dart impact strength, hexane extractables and resin stickiness of a polyethylene copolymer produced in a gas phase polymerization using a Ziegler-Natta catalyst are better controlled by regulating the ratio of aluminum from the co-catalyst to the polymer production rate. This enables one to improve properties such as dart impact strength and reduce hexane extractables by changing the amount of co-catalyst fed into the reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.