Process for polymerizing or copolymerizing ethylenically unsaturated monomers of the general formula (see formula), wherein R1, R2, R3, R4 are the same or different from one another and are conveniently selected from the following: hydrogen, saturated or unsaturated hydrocarbon radical, halogen, nitrile group, carboxylic acid, carboxy ester or another group containing acyl, and substituted halogen hydrocarbon radical, characterized in that it comprises a polymerization or copolymerization reaction using as a catalyst an organic boron complex compound, the complex comprising a coordination link between as the first component (a) a boron hydride or an alkyl boron hydride, and as a second component (b) a compound containing an element of Group V or Group VI of the Periodic Table that is capable of releasing electrons to the boron atom to give rise to the complex coordination compound. (Machine-translation by Google Translate, not legally binding)
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