Electron donors for olefin polymerization enhanced.

摘要

The present invention concerns a catalyst system yields PRESENTS UNPRECEDENTED AND A CATALYST CONTROL OF POLYMERIC PRODUCT desired properties. CATALYST SYSTEM INCLUDING A NEW GENERATION WITH TITANIUM CATALYSTS an electron donor described by the formula: wherein R1 is an alkyl composition containing a tertiary carbon atom to the silicon atom KINGDOM; GROUPS R2 and R3 are alkyl or aryl; And R4 is an alkyl group having a tertiary carbon atom to the silicon atom KINGDOM; R1 and R4 are identical or different and are preferably GROUPS carbonic TERCIARIOS 4 to 13 carbon atoms and preferably 4 to 7 carbon atoms; Even better R1 and R4 SAN EQUALS AND SEAN t-butyl groups. THE SYSTEM HAS A HIGH PERFORMANCE CATALYST 25kg / GCAT (POR) H VARY ACCORDING TO MOLAR RATIO IS / IT 4 A 20O IN THE SYSTEM. EASILY REACHED THE SYSTEM YIELDS OVER 25 KG / G-CAT (POR) H. The system also features a good handle on the xylene solubles of the polymer products.