Composition comprising prepolymer powder and pulverulent inorgan

Details Composition comprising prepolymer powder and pulverulent inorgan Composition comprising prepolymer powder and pulverulent inorgan

1990-07-02

1991-11-05

Teskin, Fred

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

524493, 524570, 524586, 526 63, 526908, 526352, 502104, 502108, C08F 402, C08L 2304

Patent

active

050631101

ABSTRACT:
A process for (co)polymerizing alpha-olefins in the gas phase in a fluidized bed or mechanically stirred bed reactor using a Ziegler-Natta type catalyst or a heat activated chromium oxide/refractory oxide catalyst wherein the (co)polymerization is carried out in the presence of 0.005 to 0.2 weight %, based on the weight of the (co)polymer bed, of an inert pulverulent inorganic substance (e.g. silica) having a mean particle diameter between 0.5 and 20 microns. The process is capable of being operated at temperatures closer to the softening point of the produced polyolefin than in the absence of the pulverulent solid.

REFERENCES:
patent: 2970135 (1961-01-01), Lanning et al.
patent: 3132125 (1964-05-01), Schwander et al.
patent: 4611038 (1986-09-01), Brun et al.

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