Process for the in situ blending of polymers
US5047468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1988 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Nov 16, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the in situ blending of polymers comprising continuously contacting, under polymerization conditions, a mixture of ethylene and at least one alpha-olefin having at least 3 carbon atoms present in an amount of about 0.1 to 3.5 mole per mole of ethylene with a catalyst in at least two fluidized bed reactors connected in series, said catalyst comprising: PA0 (i) a complex consisting essentially of magnesium titanium, a halogen, and an electron donor; PA0 (ii) at least one activator compound for the complex having the formula A1R".sub.e X'.sub.f H.sub.g wherein X' is C1 or OR"'; R" and R"' are saturated aliphatic hydrocarbon radicals having 1 to 14 carbon atoms and are alike or different; f is 0 to 1.5; g is 0 or 1; and e+f+g=3; and PA0 (iii) a hydrocarbyl aluminum cocatalyst, the polymerization conditions being such that ethylene copolymer having a high melt index in the range of about 0.1 to about 1000 grams per 10 minutes is formed in at least one reactor and ethylene copolymer having a low melt index in the range of about 0.001 to about 1.0 gram per 10 minutes is formed in at last one other reactor, each copolymer having a density of about 0.860 to about 0.965 gram pe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.