Patent ID: 8575283

Claim:
A solid catalyst component for the polymerization or co-polymerization of alpha-olefins comprising titanium, magnesium, halogen and at least one internal electron donor selected from heterocyclic organic compounds of: wherein L is represented by: wherein A and A 1 , which may be identical or different, is a carbon atom or a heteroatom selected from the group consisting of Si, N, B, and P; wherein Q and Q 1 , which may be identical or different, is a heteroatom selected from the group consisting of O, N, S, and P; wherein R 1 , R 4 , R 5 , and R 8 , which may be identical or different, are aliphatic, alicyclic or aromatic groups; wherein the subscripts p, q, i, and j are independently selected from 0 or 1; wherein the bonds directly connected to Q, A, Q 1 , and A 1 , are independently a single bond or a double bond; wherein R, R 2 , R 3 , R 6 , and R 7 , which may be identical or different, are bridging groups with a backbone chain length being 1-6 atoms for R and 0-6 atoms for R 2 , R 3 , R 6 , and R 7 , wherein the resultant ring structure is a three to eight-membered ring.