| abstract |
(57) [Summary] (with correction) [PROBLEMS] A rubber-like, non-graded 1,3-butadiene-isoprene random copolymer suitable for tire sidewalls of truck tires, and having a cut growth resistance without impairing traction characteristics. And those that can improve the tread wear characteristics and reduce the rolling resistance. An isoprene monomer and 1,1,2,3,4,5,5,6,5,6,7,8,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10 ,,,,,,,,,,,,,,,,,,,,,,,,,,, I, at least one compound containing at least one labile halogen atom; The 3-butadiene monomer is copolymerized. The III-B metal-containing catalyst component comprises: (1) Mixing (a) an organoaluminum hydride, (b) an alcohol or thiol, and (c) optionally 1,3-butadiene to produce a modified organoaluminum catalyst component; (2) adding an organometallic compound containing a Group III-B metal; produced by a process. |