Patent ID: 8604143

Claim:
A catalyst composition for preparing cis-1,4 polyisoprene formed from components consisting essentially of: (A) at least one titanium halide; (B) at least one organic aluminum compound comprising at least one alkyl aluminum of formula AlR 3 , wherein each of the three Rs is independently chosen from linear and branched C 1-6 alkyl groups; and (C) at least one electron donor comprising at least one polyether compound of formula (I) and/or at least one tetrahydro-furfuryl ether compound of formula (II), R 0 O(R 1 O) p R 2 (I), wherein R 0 and R 2 are independently chosen from linear and branched C 1-6 alkyl groups; R 1 is —(CR 3 R 4 —CR 5 R 6 )—, wherein R 3 , R 4 , R 5 , and R 6 are independently chosen from hydrogen and linear and branched C 1-4 alkyl groups, and p is an integer ranging from 1 to 6, wherein R 7 is chosen from linear and branched C 1-10 alkyl groups and aryl groups; R 8 , representing at least one substituent on the tetrahydro-furfuryl moiety, is independently chosen from hydrogen and linear and branched C 1-4 alkyl groups.