high performance ziegler-natta catalyst systems, process for producing such mgcl2 based catalysts and use thereof

摘要

abstract "high performance ziegler-natta systems, process for producing such mgcl2-based catalysts and their use" improved catalysts and methods of preparing the improved ziegler-natta catalyst are described. the ziegler-natta catalyst is formed using a spherical support of mgcl2-xroh, where r is a straight chain, cyclic or branched hydrocarbon moiety having 1-10 carbon atoms, and roh is an alcohol or a mixture of at least two different alcohols and wherein x has a range from about 1.5 to 6.0, preferably about 2.5 to 4, more preferably about 2.9 to 3.4, and most preferably 2, 95 to 3.35. the ziegler-natta catalyst comprises a group 4-8 transition metal and an internal donor comprising a diether compound. The catalyst has improved activity in olefin polymerization reactions as well as good stereochemical regularity and hydrogen sensitivity, and may be useful in the production of phthalate-free propylene polymers with a molecular weight distribution (pi (gpc)) in the range from about 5.75 to about 9.