Process for producing polyolefin granules having an average part

Details Process for producing polyolefin granules having an average part Process for producing polyolefin granules having an average part

1982-02-08

1983-11-08

Levin, Stanford M.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526139, 526140, 526141, 526142, 526144, 526159, 526351, 526907, 526908, 502104, 502154, 502169, C08F 464

Patent

active

044143710

ABSTRACT:
Polyolefin granules having an average particle size diameter greater than 600 microns, preferably about 1000 microns or greater are obtained by polymerizing 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 trihalide is about 6.times.10.sup.-4 to about 0.02 millimoles per liter per second per m.sup.2 of available preformed titanium trihalide surface area until solids product of desired size are obtained.

REFERENCES:
patent: 3412174 (1968-11-01), Kroll
patent: 3905915 (1975-09-01), Wristers
patent: 4060593 (1977-11-01), Kazuo et al.
patent: 4085064 (1978-04-01), Wristers
patent: 4182691 (1980-01-01), Ueno et al.
patent: 4183826 (1980-01-01), Ueno et al.
patent: 4200717 (1980-04-01), Abe et al.

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