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| Electrophotographic lithographic printing plate precursor |
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| Blends of polyolefin graft polymers and ASA polymers |
| OF THE INVENTION AND THE PREFERRED EMBODIMENTS THEREOF Proportions of the ASA polymer in a binary ... |
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| Stengthened high impact styrene polymers showing improved physical-mechanical properties |
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| Graft copolymer compositions |
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| Self-locking nut |
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Polymerization catalyst, production and use
| Details |
Inventors: Best, Steven A.;
Assignee: Exxon Research & Engineering Co. (Florham Park, NJ)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A vanadium-containing catalyst component useful for the polymerization of olefins to polyolefins having a high molecular weight and a broad molecular weight distribution comprising polymerizing the polyolefins in the presence of a catalyst comprising (A) a vanadium-containing catalyst component obtained by contacting an inert support material with a dihydrocarbyl magnesium compound, optionally an oxygen-containing compound, a vanadium compound, a Group III metal halide, and (B) an aluminum alkyl cocatalyst. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A vanadium-containing catalyst component obtained by sequentially treating an inert solid support material in an inert solvent with (A) a dihydrocarbyl magnesium compound, (B) optionally an oxygen-containing compound which is an alcohol, ketone and aldehyde, (C) a vanadium compound, and (D) a Group IIIa metal halide.
2.
The vanadium-containing catalyst component of claim 1 wherein the dihydrocarbyl magnesium compound is represented by the formula R.
sup.
1 MgR.
sup.
2 or a complex thereof with an aluminum compound, wherein each of R.
sup.
1 and R.
sup.
2, which may be the same or different, are an alkyl group, aryl group, cycloalkyl group, aralkyl group having from 1 to 20 carbon atoms, the vanadium compound is represented by the general formulas: ##STR4## where x=0-3 and R=a hydrocarbon radical; VCl.
sub.
y (OR).
sub.
4-y, (2) where y=3-4 and R=a hydrocarbon radical; ##STR5## where z=2-3 and (AcAc)=acetyl acetonate group; ##STR6## where (AcAc)=acetyl acetonate group; and VCl.
sub.
3 .
cndot.
nB, (5) where n=2-3 and B=a Lewis base which can form hydrocarbon-soluble complexes with VCl.
sub.
3 ; and the Group III metal halides are selected from boron trichloride, boron hydrocarbyl halides and aluminum alkyl halides.
3.
The vanadium-containing catalyst component of claim 2 wherein the Group III metal halides are selected from boron trichloride, ethyl aluminum dichloride and ethyl boron dichloride.
4.
The vanadium-containing catalyst component of claim 1 wherein the inert solid support material is an inorganic oxide or mixtures of inorganic oxides.
5.
The vanadium-containing catalyst component of claim 4 wherein the inorganic oxide is silica.
6.
The vanadium-containing catalyst component of claim 2 wherein the vanadium compound is selected from vanadyl trichloride, vanadium tetrachloride, vanadyl tributoxy and vanadyl chloride dibutoxy.
7.
The vanadium-containing catalyst component of claim 1 wherein the dihydrocarbyl magnesium compound is selected from dialkyl magnesium compounds wherein the alkyl groups, which may be the same or different, can have 1 to 10 carbon atoms
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