Ethylene copolymers with narrow composition distribution and high melting temperatures, and methods of production thereof
US6380341B1 · kind B1 · utility
30Cited by
1References
42Claims
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Key dates
| Filing date | Jul 8, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jul 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A copolymer of ethylene and at least one comonomer containing at least 4 carbon atoms is characterized by a polydispersity greater than 2, a broad melting point transition as measured by differential scanning calorimetry, and a narrow composition distribution. Ethylene/C4+ copolymers also may show at least one peak melting point above the peak melting point of a random copolymer of the same monomer unit composition. These copolymers are made by contacting ethylene and a comonomer under polymerization conditions in the presence of a suitable fluxional catalyst system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.