Ethylene copolymers, process for the preparation of ethylene-based polymers and catalyst system used therein
US6136936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Ethylene copolymers are prepared with comonomers selected from: PA0 (a) .alpha.-olefins, PA0 (b) cycloolefins and PA0 (c) polyenes, with a content of ethylene units of between 80 and 99 mol %, a content of units derived from .alpha.-olefin, cycloolefin and/or polyene comonomers of between 1 and 20 mol %, characterized in that: PA0 (a) in TREF (Temperature Rising Elution Fractionation) analysis, a quantity equal to at least 90% by weight of the copolymer is eluted within a temperature interval of less than 50.degree. C., and PA0 (b) M.sub.w /M.sub.n >3, where M.sub.w is the weight-average molecular weight and M.sub.n is the number-average molecular weight, both determined by means of GPC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.