Copolymer of ethylene and of at least one alpha-olefin and method for obtaining same
US6331599A · kind A · utility
1Cited by
11References
18Claims
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Key dates
| Filing date | Apr 22, 1999 |
| Grant date | Dec 18, 2001 |
| Priority date | — |
| Expiry date | Apr 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymer of ethylene and of at least one alpha-olefin obtained by means of a catalytic solid base on chromium oxide deposited on an inorganic support, the said copolymer having a melt flow index HLMI, measured in g/10 min, an amount of alpha-olefin Q, pressed in g of alpha-olefin per kg of copolymer, a standard density SD, measured in kg/m.sup.3, at least equal to (952.75+5.40.times.log HLMI-0.79.times.Q) and a relatively broad molecular mass distribution, characterized by a ratio of the dynamic viscosities .mu..sub.0 /.mu..sub.2 at least equal to (23.67-6.67.times.log HLMI).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.