Abstract: Disclosed is a process for the polymerization of norbornene derivatives which comprises contacting the monomer(s) with a catalytic system comprising the following two components:(1) a tungsten compound which is the product of combining a tungsten halide with a para-trihalomethylphenol which can be described by the formula ##STR1## in which each R is selected from alkyl and halide, and (2) a compound of the general formula: ##STR2## in which at least two of R.sup.1, R.sup.2 and R.sup.3 are selected from unsubstituted and substituted C.sub.1-20 hydrocarbyl.

Abstract: Disclosed is a process for the polymerization of norbornene derivatives which comprises contacting the monomer(s) with a catalytic system comprising the following two components:(1) a tungsten compound which is the product of combining a tungsten halide with a para-trihalomethylphenol which can be described by the formula ##STR1## in which each R is selected from alkyl and halide, and (2) a compound of the general formula: ##STR2## in which at least two of R.sup.1, R.sup.2 and R.sup.3 are selected from unsubstituted and substituted C.sub.1-20 hydrocarbyl.

Abstract: A process for the stereospecific polymerization of an alpha olefin with at least three carbon atoms, with a catalyst system comprising (a) a titanium halide, and (b,i) a reaction product of an organoaluminum halide and an aromatic compound or (b,ii) a reaction product of an organoaluminum halide, an aromatic compound and a halogen-free organoaluminum compound, the aromatic compound being a hydroxy aromatic compound which comprises a sec. or tert. alkyl group in both ortho-positions in respect of the hydroxyl group.

Abstract: A TiCl.sub.3 olefin polymerization catalyst component is prepared by reducing TiCl.sub.4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl.sub.4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15.degree. to 50.degree. C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl.sub.3, and thereafter converting the precipitate into active TiCl.sub.3 by heating at a temperature of from 80.degree. to 110.degree. C. during at least 30 minutes. The active TiCl.sub.3, when combined with a conventional organoaluminum cocatalyst, provides a stereospecific catalyst for the polymerization of alpha monoolefins having high activity, good morphology and good stereospecificity.

Abstract: A TiCl.sub.3 olefin polymerization catalyst component is prepared by reducing TiCl.sub.4 with an aluminum trihydrocarbyl compound in a molar ratio of Ti:Al of 2.7:1 to 4.0:1 in the presence of diisoamyl ether and a hydrocarbon solvent by gradually adding TiCl.sub.4 to the aluminum trihydrocarbyl compound and at least a substantial proportion of the diisoamyl ether at a temperature of from 15.degree. to 50.degree. C. during a period of from 0.7 to 2.5 hours to produce a precipitate of TiCl.sub.3, and thereafter converting the precipitate into active TiCl.sub.3 by heating at a temperature of from 80.degree. to 110.degree. C. during at least 30 minutes. The active TiCl.sub.3, when combined with a conventional organoaluminum cocatalyst, provides a stereospecific catalyst for the polymerization of alpha monoolefins having high activity, good morphology and good stereospecificity.

Abstract: A process for the preparation of violet TiCl.sub.3 by reducing TiCl.sub.4 with an organo-aluminum compound, characterized in that:(a) the TiCl.sub.4 is premixed with a complexing agent in an inert organic solvent, the molar ratio complexing agent:TiCl.sub.4 being within the range from 0.3:1 to 2:1;(b) the organo-aluminum compound is premixed with a complexing agent in an inert organic solvent, the molar ratio complexing agent:organo-aluminum compound being at least 0.25:1;(c) the reduction to TiCl.sub.3 and precipitation of TiCl.sub.3 are carried out by combining at least one stoichiometric equivalent of TiCl.sub.4 in the premixed composition of step (a) with one stoichiometric equivalent of the organoaluminum compound in the premixed composition of step (b) over a period of less than one hour at a temperature within the range 60.degree. to 110.degree. C.; and(d) the final concentration of violet TiCl.sub.3 in the reaction mixture is at least 0.2 mol./liter.