A catalyst system for the polymerization or copolymerization of .alpha.-olefins comprises a bis(imino)pyridyl complex of a transition metal on a support having an aluminum halide and/or an alkylaluminum halide chemically or physically bonded thereto.

 
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> Borazine-based resin, and method for production thereof, borazine based resin composition, insulating coating and method for formation thereof, and electronic parts having the insulating coating

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