Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
1994-04-26
2001-05-15
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S124200
Reexamination Certificate
active
06232422
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention pertains to particles of preferably anhydrous, magnesium chloride (MgCl
2
) in a new form as well as the process for their fabrication which overcome the disadvantages of spherical forms of MgCl
2
. These MgCl
2
particles can be employed as catalytic supports, particularly in Ziegler-Natta catalytic components. When these catalytic components are employed as part of a catalyst system in the polymerization of olefins, they preserve the morphology of the support. These catalytic components, catalyst systems utilizing the same are also part of the invention as are the processes for making these products and polyolefins obtained by the use of the catalytic components.
SUMMARY OF THE INVENTION
The MgCl
2
in accordance with the invention is constituted of porous particles which have, when viewed under a microscope, the form of essentially regular polyhedrons with six or eight faces in which the paired symmetrically opposite faces are essentially parallel two of which faces are large and enlongated and form the top face and the bottom face of a polyhedron such that on each of them the longest diagonal (D) is larger than the shortest distance (d) separating two opposite sides, which large elongated faces are surrounded essentially perpendicularly by the other essentially rectangular faces that form the sides of the said polyhedron, the length of the smaller side (e) of each of the said essentially rectangular faces being less than the shortest distance (d) separating the two opposite sides of the large elongated faces.
Since the paired symmetrically opposite faces of a polyhedron are essentially parallel, the said faces can therefore be considered to be essentially geometrically identical.
The longest diagnonal (D) of each of the two large elongated faces of a polyhedron is usually from 10 to 100 &mgr;m in length. The shortest distance (d) separating two opposite sides of each of these two large faces is usually from 4 to 40 &mgr;m in length. The length of the smallest side (e) of each of the other faces forming the polyhedron, which length can also be considered to be the thickeness of the MgCl
2
particles, is usually from 2 to 20 &mgr;m. These particle dimensions are of course combined in a manner such as to respect the definition of the polyhedron and therefore are preferably such that the ratio {fraction (D/d)} is from 2 to 7 and the ratio {fraction (d/e)} is from 1 to 3.
The invention also comprises the process of making such MgCl
2
, catalytic components and catalysts utilizing such MgCl
2
, and polyolefins obtained with catalysts utilizing such MgCl
2
, all as hereinafter described.
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Brun Claude
Duranel Laurent
Soto Thierry
Spitz Roger
Atofina
Sigalos John L.
Wu David W.
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