C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
252/105, 23/161,
C08F 4/16 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01)
Patent
CA 1163622
ABSTRACT OF THE DISCLOSURE Polyolefin granules having an average particle size diameter greater than 600 microns, preferably about 1000 microns or greater are obtained by poly- merizing monoolefins in the presence of a titanium catalyst having an average particle size diameter of greater than about 35 microns and preferably 40 to 65 microns. The titanium catalysts are obtained by reducing titanium tetrahalide in the presence of a suitable organometallic reducing compound such as diethylaluminum chloride under controlled conditions of temperature, reduction rate and concentrations to obtain a titanium halide reduced solids product seeds having an average particle size diameter of about 20 microns or greater and thereafter simultaneously and without interruption adding to the seeds containing system titanium tetrahalide and organometallic reducing compound such as diethylaluminum halide at a rate such that the reduction of titanium tetrahalide to titanium trinalide is about 6 x 10-4 to about 0.02 millimoles per liter per second per m2 of available preformed titanium trihalide surface area until solids product of desired size are obtained.
371016
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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