The dinuclear early and late transition metal catalysts have shown enhanced activity, incorporation of α-olefins, tolerance to functional groups, tacticity control etc. as compared to that of related mononuclear catalysts. In this study we have prepared mono- and dizirconium bisamine bisphenolate catalysts having C6Me5 and anthracene as spacer groups. These catalysts were then used for copolymerization of ethylene with 10-undecen-1-ol and 10-undecnoic acid in the presence of MAO and TIBA. It was noticed that activity of all mono and bimetallic catalyst was increased with increase in the concentration of 10-undecen-1-ol and 10-undecenoic acid indicating that these catalysts are more tolerant to functional groups as compared to that of conventional metallocene catalysts. Bimetallic catalysts having either C6Me4 or anthracene spacer exhibited higher activity but lower incorporation of comonomers than that of monometallic catalysts. These results are consistent with our earlier work that larger comonomers sterically clash with the distal metal center of the bimetallic catalysts, leading to lower incorporation.

Copolymerization of ethylene with a-olefins having functional groups using mono and bimetallic zirconium catalysts

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