| abstract |
ACCORDING TO THE INVENTION, AT LEAST ONE OLEFIN IS POLYMERIZED IN THE PRESENCE OF A CATALYST CONSISTING OF A COMBINATION OF I A SOLID SUBSTANCE OBTAINED BY REACTION OF AT LEAST THE TWO FOLLOWING COMPONENTS: I AT LEAST ONE MAGNESIUM COMPOUND REPRESENTED BY THE GENERAL FORMULA R (OR) MGX, AND II A TITANIUM COMPOUND, A VANADIUM COMPOUND OR THEIR MIXTURES; II A SILICON COMPOUND REPRESENTED BY THE GENERAL FORMULA (CF DRAWING IN BOPI) III AN ORGANOMETALLIC COMPOUND. |