Low density copolymers of ethylene and alpha-olefins
US6642339B1 · kind B1 · utility
20Cited by
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8Claims
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Key dates
| Filing date | Oct 26, 2000 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Jan 8, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers of ethylene and alpha olefins having from 3 to 10 carbon atoms and which have(a) a density in the range 0.900 to 0.940(b) an apparent Mw/Mn of 2-3.4(c) I21/I2 from 16 to 21.5(d) activation energy of flow from 28 to 45 kJ/mol(e) a ratio Ea(HMW)/Ea(LMW)>1.1, and(f) a ratio g′(HMW/g′(LMW) from 0.85 to 0.95.The copolymers are particularly useful in film applications showing an excellent balance of processing, optical and mechanical properties. The novel polymers may suitably be prepared in the gas phase in the presence of metallocene complexes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.