Powder of (co)polymer of one or more 1-olefins blended with pulv

Details Powder of (co)polymer of one or more 1-olefins blended with pulv Powder of (co)polymer of one or more 1-olefins blended with pulv

1991-07-19

1993-07-06

Teskin, Fred

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524700, 524779, 524786, 524787, 524789, 524791, 524847, 524881, 526901, 526909, 428403, 428404, C08K 700, C08F 234

Patent

active

052254585

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: 2984634 (1961-05-01), Caldwell et al.
patent: 3132125 (1964-05-01), Schwander et al.
patent: 3300457 (1967-01-01), Schmid et al.
patent: 4611038 (1986-09-01), Bran et al.
patent: 5063110 (1991-11-01), Bailly et al.

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