Ethylene polymerization process

Details Ethylene polymerization process Ethylene polymerization process

1992-09-25

1994-11-15

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526106, 526129, 526137, 526104, 5263483, 5263484, 5263485, 5263486, 502119, 502228, 502256, C08F 478

Patent

active

053649150

ABSTRACT:
A process to produce a polyethylene composition that has less than 2 weight percent fines, based on the weight of said polyethylene composition, and a fluff bulk density greater than 25 pounds per cubic foot, said process comprising polymerizing ethylene in the presence of a trialkylaluminum compound, and a diluent that is essentially saturated with ethylene under slurry polymerization conditions that comprise a polymerization temperature from 104.degree. C. to 116.degree. C., with an activated catalyst system comprising (a) a catalyst support that comprises a silica compound, wherein said catalyst support has a pore volume less than 2 cubic centimeters per gram, (b) a catalyst that comprises a chromium compound, wherein the amount of chromium in said catalyst system is from about 0.1 to about 20 weight percent, wherein said weight percent is based on the total weight of said catalyst and catalyst support, and (c) a fluorine compound, wherein the amount of fluorine used is from about 0.1 to about 20 weight percent, wherein said weight percent is based on the total weight of said catalyst support.

REFERENCES:
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patent: 4503201 (1985-03-01), McDaniel et al.
patent: 4596862 (1986-06-01), McDaniel et al.
patent: 4806513 (1989-02-01), McDaniel et al.
patent: 4946914 (1990-08-01), Hsieh

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