Arrangements of Points on the Sphere

An improved process and catalyst is described for polymerizing alpha -alkenes using a catalyst obtained by reacting a chromium-1,3-diketo complex compound having the general formula Cr(OCR1CR2CR3O)3, with an organometallic compound, of a metal from Group II or III of the Periodic Table, contacting the reaction product with an inert inorganic support material, heating said reaction product on said support at a temperature of between about 200 DEG and 1200 DEG C. in a non-reducing atmosphere, combining the resulting product with an organometal compound of a metal from Group II or III of the Periodic Table. The catalysts are highly active and give high yields of polymer. By a proper selection of the pore volume and the particle size of the catalyst support polyalkenes of improved handling properties are obtained.