Catalytic components and catalysts for the polymerization of olefins

Claim 1

Catalyst-forming components for use in preparing catalysts for polymerization of olefins, said components consisting of a product of the following composition: TiCl.sub.3.(AlR.sub.m X.sub.3-m).sub.a A.sub.p wherein: R is a hydrocarbon radical containing from 1 to 20 carbon atoms; O ≦m≦2.5; X is halogen; a is a number lower than 0.4; A is an ether selected from the group consisting of monoethers of formula R'OR" wherein R' and R" are alkyls containing from 1 to 10 carbon atoms, aryls, cycloalkyls, alkylaryls or aralkyls, and polyethers of the class of polyalkylenglycol-dialkyl-ethers and 1,2-diphenoxyehtane, said ether being capable of forming complexes or coordination products with Al halides or alkyl-Al halides, which complexes or coordination products are soluble in the ether itself or in aromatic or aliphatic hydrocarbons or in the halogenated derivatives thereof; and p is zero or a number greater than zero but lower than 0.5 and said catalyst-forming components being characterized in that, in the X-rays spectrum thereof, diffraction lines apper at the following lattice distances: d=5.4 A (intense line); d=2.75 A (line of medium intensity); d=2.12 A (line of medium to weak intensity); d=1.98 A (very weak line); d=1.77 A (medium line), and in that the surface area thereof is comprised between 2 and 20 m 2 /g and the porosity is lower than 0.1 cc/g.