Catalytic components and catalysts for the polymerization of olefins

摘要

There are disclosed new catalysts for the stereospecific polymerization of alpha-olefins having the formula CH2=CHR in which R is an alkyl radical containing from 1 to 4 carbon atoms and the starting components of which comprise (a) a halogenated organometallic Al compound and (b) reduction products of TiCl4 comprising TiCl3 in the crystalline beta form.