| abstract |
A PROCESS FOR PREPARING SYNDIOTACTIC VINYL AROMATIC POLYMERS COMPRISING CONTACTING ONE OR MORE AROMATIC MONOMERS UNDER POLYMERIZATION CONDITIONS WITH A CATALYST CORRESPONDING TO THE FORMULA; [CPMMXNX'P]+A' WHEREIN: CP IS A SINGLE n5-CYCLOPENTADIENYL OR n5-SUBSTITUTED CYCLOPENTADIENYL GROUP; M IS A METAL OF GROUP 3,4,5,6,8,9,10 OR THE LANTHANIDE SERIES OF THE PERIODIC TABLE; X EACH OCCURANCE IS AN INERT ANIONIC LIGAND, WITH THE PROVISO THAT AT LEAST ONE X IS R; X' IS AN INERT, NEUTRAL, DONOR LIGAND; R IS HYDROCARBYL, SILYL, A COMBINATION THEREOF OR A SUBSTITUTED DERIVATIVE THEREOF HAVING UP TO 20 CARBON, SILICON OR CARBON AND SILICON ATOMS; M AND P ARE INDEPENDENTLY 0 OR 1; N IS AN INTERGER GREATER THAN OR EQUAL TO 1; THE SUM OF M AND N IS EQUAL TO THE VALENCE OF M; AND A' IS A NONCOORDINATING, COMPATIBLE ANION OF A BRONSTED ACID SALT. |