Method for making titanium trichloride catalysts
AssigneeDart Industries Inc.
InventorsJohn L. H. Allan, Birendra K. Patnaik, Agapios Agapiou
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Abstract
A storage stable, improved catalyst is obtained when an aluminum-reduced titanium trichloride catalyst which has been modified by treatment with an electron donor is heated at a temperature and for a period of time sufficient to drive the reaction to completion. In some instances this will involve the removal of gas which has been generated during the modification. In the usual practice a temperature of about 90.degree. C. and a period of about 90 minutes will be employed.
Claims10
A catalyst comprising (1-n)(3TiCl.sub.3 AlCl.sub.3)n(3TiCl.sub.3 -AlCl.sub.2) where
- (a) n is a positive number less than or equal to one,
- (b) X is selected from the group consisting of oxygen, sulfur, selenium and tellurium,
- (c) XR is derived from an electron donor compound R.sup.1 --X--R.sup.2 wherein R.sup.1 is an organic grouping selected from the group consisting of alkyl, cycloalkyl, aryl, substituted derivations thereof and a grouping of the formula ##STR3## wherein X is oxygen, sulfur, selenium or tellurium and R.sup.3 is alkyl, cycloalkyl, aryl or substituted derivatives thereof, wherein R.sup.2 is an organic grouping selected from the group consisting of alkyl, cycloalkyl, aryl, and substituted derivatives thereof, and wherein R is R.sup.1 or R.sup.2, and
- wherein said catalyst is essentially free of any hydrocarbon solvent.
A process for providing a storage stable olefin polymerization catalyst which comprises heating an aluminum-reduced titanium trichloride catalyst which has been activated by treatment with an electron donor compound of the formula R.sup.1 --X--R.sup.2 wherein X is oxygen, sulfur, selenium or tellurium, wherein R.sup.1 is alkyl, cycloalkyl, aryl, substituted derivatives thereof or a grouping of the formula:
- ##STR5## wherein X is oxygen, sulfur, selenium or tellurium and R.sup.3 is alkyl, cycloalkyl, aryl, or substituted derivatives thereof, and wherein R.sup.2 is alkyl, cycloalkyl, aryl or substituted derivatives thereof, said heating being at a temperature and for a period of time sufficient to effect the elimination of substantially all of the R.sup.1 Cl from said catalyst.
Dependencies are inferred from the claim text.