Verfahren für Gasphase-Polymerisation von Alpha-Olefinen

摘要

The present invention relates to a process for the production of polymers and copolymers of olefins CH2=CHR, wherein R is a hydrogen atom or an alkyl or aryl radical having a number of carbon atoms of from 1 to 10, comprising at least one (co)polymerization step in the gas phase, in the presence of a highly active catalyst obtained from a titanium compound supported on a magnesium halide in active form and an Al-alkyl compound. The process is characterized by the fact that it is carried out by feeding a small amount compared with the polymer of a compound having at least two groups, same or different, capable of reacting with the alkyl aluminum compound and able to selectively inhibit the reactivity of the polymer particles fine compared to the average granulometric size of the polymer present in the gas phase.