High activity staged reactor process

Details High activity staged reactor process High activity staged reactor process

1996-03-05

1997-09-09

Delmendo, Romulo H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 54, 525247, 525268, 526 65, 526 68, 526 88, C08F 234

Patent

active

056658184

ABSTRACT:
A process comprising contacting ethylene and at least one alpha-olefin comonomer having 3 to 8 carbon atoms with a transition metal based catalyst system in two fluidized bed reactors connected in series, in the gas phase, under polymerization conditions, with the provisos that:
(a) the first reactor is operated at a temperature at or above the dew point of the mixture of monomers, but no higher than about 5 degrees C. above said dew point;
(b) the mixture of ethylene copolymer matrix and active catalyst formed in the first reactor in the series is transferred to the second reactor in the series;
(c) other than the active catalyst referred to in proviso (b), no additional catalyst is introduced into the second reactor;
(d) in the reactor in which a low melt index copolymer is made:

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patent: 5047468 (1991-09-01), Lee et al.
patent: 5272236 (1993-12-01), Lai et al.
patent: 5405901 (1995-04-01), Daniell et al.
patent: 5405922 (1995-04-01), DeChellis et al.

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