Amide succession metal chemical compound and catalytic converter system null for isotactic polypropylene production

摘要

Bridged and unbridged amido transition metal compounds of the Group IV-B metals are disclosed. They are represented by general formula (I) wherein: 'y' is 1 denoting the presence of a bridging group T between nitrogen atoms; 'Z' is - y; 'M' is zirconium, hafnium or titanium; 'N' is a nitrogen atom having three substituents; each 'X' is, independently, any univalent anionic ligand such as a halide, hydride, substituted or unsubstituted C1-C30 hydrocarbyl, alkoxide, aryloxide, amide, arylamide, phosphide, or arylphosphide; 'T' is a covalent bridging group selected from the group consisting of unsubstituted hydrocarbyl and substituted hydrocarbyls containing a Group IV-A or VI-A element; and each 'R' is, independently, a radical selected from the group consisting of singly branched hydrocarbyl radicals having between 4 and 30 carbon atoms, multiply branched hydrocarbyl radicals having between 4 and 30 carbon atoms, halogen radicals, amido radicals, phosphido radicals, silyl radicals, alkoxy radicals, alkylborido radicals, C1-C30 hydrocarbyl-substituted Group IV-A metalloid radicals; and substituted C1-C30 hydrocarbyl radicals wherein one or more hydrogen atoms is replaced by a halogen radical, an amino radical, a phosphido radical, an alkoxy radical or any other radical containing a Lewis acidic or basic functionality. These compounds may be used in a catalyst system comprising the amido transition metal compound and an alumoxane. Also disclosed is a process using the catalyst system for the production of high molecular weight polyolefins and, particularly, high molecular weight isotactic polypropylene.