Patent ID: 8283425

Claim:
A catalyst component for polymerizing at least one olefin comprising a product of a reaction between a transition metal compound and an adduct, wherein the transition metal compound is selected from a titanium compound of formula Ti(OR) n X y-n , wherein n is between 0 and y; y is a valence of titanium; X is halogen; and R is an alkyl radical comprising 1-8 carbon atoms, or COR, wherein R is a hydrocarbon group comprising from 1 to 20 carbon atoms, and the adduct comprises MgCl 2 , ethanol and a Lewis base (LB) different from water, said adduct further comprising a fusion enthalpy lower than 100 J/g, and formula MgCl 2 •(EtOH) n (LB) p , wherein n is from 2 to 6 and p is 0<p/(n+p)≦0.1, where the Lewis base is selected from ethers, esters, compounds of formula RX m , and combinations thereof, wherein RX m is selected from the group consisting of methanol, propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, pentanol, 2-methyl-1-pentanol, 2-ethyl-1-hexanol, phenol, 4-methyl-1-phenol, 2,6-dimethyl-1-phenol, cyclohexanol, cyclopentanol, ethylene glycol, propylene glycol, 1,4-butanediol, glycerine, mannitol, polyvinyl-alcohol, acetonitrile, ethylenediamine, 3-picoline, triethanolamine, triethylamine, and diisopropylamine.