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1313008 
Journal Article 
SUPERACTIVE AND STEREOSPECIFIC CATALYSTS. IV. INFLUENCE OF STRUCTURE OF ESTERS ON MAGNESIUM CHLORIDE-SUPPORTED OLEFIN POLYMERISATION CATALYSTS 
Chien JCW; Hu Y; Vizzini, JC 
1990 
CH-type catalysts were prepared by reacting MgC12.ROH, where ROH was 2-ethylhexanol(EH), (R)-2-octanol(R-2O) and (S)-2-octanol(S-2O), with titanium tetrachloride in the presence of diisobutyl phthalate (BP) , diisobutyl terephthalate(BT), (-)-dimenthyl phthalate(MP) or (-) -dimenthyl terephthalate(MT). The CH(EH,BP) catalyst was found to be five times more active than the CH(EH,MT) catalysts and to produce PP which was 97% isotactic, as compared with 84.7% for the latter. The catalysts derived from 2-octanols were much less active than the corresponding catalysts prepared with EH due to lack of reactivity with phthalic anhydride which permitted excessive incorporation of titanium tetrachloride to form non-stereospecific catalytic sites as well as inactive Ti species. 11 refs. 
SUPPORTED CATALYST; PROPYLENE POLYMER; PP; POLYMERISATION CATALYST; USA; POLYMERIZATION CATALYST; OLEFIN POLYMER; TECHNICAL; CATALYTIC ACTIVITY; TABLES; STEREOSPECIFIC POLYMERIZATION; ISOTACTIC; PLASTIC; POLYOLEFIN; HIGH ACTIVITY CATALYST; STEREOSPECIFIC POLYMERISATION; CATALYST; GRAPH; DATA; TACTICITY; THERMOPLASTIC