Process for alpha-olefin gas-phase polymerization controlled by

Details Process for alpha-olefin gas-phase polymerization controlled by Process for alpha-olefin gas-phase polymerization controlled by

1992-02-28

1993-09-14

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 82, 526 86, 526185, 526901, C08F 240

Patent

active

052449874

ABSTRACT:
A process for controlling the continuous gas-phase polymerization of one or more alpha-olefins in a fluidized and/or mechanically stirred bed reactor using a high activity catalyst based on a transition metal of groups IV, V or VI of the Periodic Table comprises introducing into the reactor, continuously and simultaneously, an activity retarder and an activator, in very small amounts, in a molar ratio and at flow rates which are varied with time in order to maintain substantially constant either the polymerization rate or the transition metal content of the polymer produced.

REFERENCES:
patent: 4354009 (1982-10-01), Goeke et al.
patent: 4387202 (1983-06-01), Falbe et al.
patent: 4721763 (1988-01-01), Bailly et al.
patent: 4855370 (1989-08-01), Chirillo et al.
patent: 4956426 (1990-09-01), Ardell et al.

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