Gas-phase alpha-olefin polymerization process in the presence of

Details Gas-phase alpha-olefin polymerization process in the presence of Gas-phase alpha-olefin polymerization process in the presence of

1989-09-05

1991-11-19

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 83, 526 84, 526 85, 526106, 526123, 526158, 526901, C08F 238, C08F 424

Patent

active

050667360

ABSTRACT:
A process for the continuous polymerization of one or more alpha-olefins with a transition metal catalyst, in a reactor having a fluidized and/or mechanically stirred bed, in which a very small amount of an activity retarder, generally less than 0.1 ppm, is introduced continuously into the reactor at a flow rate which is varied with time so as to keep substantially constant either the polymerization rate or the content of transition metal in the polymer produced. Suitable activity retarders include polymerization inhibitors such as, for example, oxygen, alcohols, carbon monoxide and carbon dioxide and electron donor compounds such as amides and ethers.

REFERENCES:
patent: 3067190 (1962-12-01), Rottig et al.
patent: 3562357 (1971-02-01), Eichenbaum
patent: 4649128 (1987-03-01), National Dist.
patent: 4721763 (1988-01-01), Bailly et al.
Translation of SU (USSR) 1249025.
Polymer Science USSR, vol. 22, 1980, pp. 448-454.

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