Catalyst for polymerization of olefins

摘要

Catalysts for polymerization of olefin which comprise a solid catalyst component (A) and an organometallic compound with a heterocyclic carboxylic acid ester (B), wherein the solid catalyst component (A) is obtained by reacting or/and grinding an organomagnesium compound (1), of the formula M alpha Mg beta Rp1Rq2Xr wherein alpha , p, q and r each independently >/=0, beta >0, p+q+r=m alpha +2 beta M is Al, Zn, B or Be, m is the valence of M, R1 and R2 are the same or different hydrocarbon groups having 1-20 carbon atoms, and X is a halogen atom, or of the reaction product of M alpha Mg beta Rp1Rq2Xr with an electron donor, with 0.01 to 100 moles of (ii) a chlorosilane compound containing Si-H bonds and of the formula HaSiClR4-(a+b)3 wherein0