PROCESS FOR PREPARING POLYOLEFINS

摘要

Polyolefins exhibiting better particle properties are prepared by polymerizing an olefin or olefins in the presence of a catalyst comprising a solid catalyst component being prepared by the reaction of the following components (I) and (II): (I) a reaction product obtained by reacting the following components (1), (2) and (3) with one another: (1) a silicon oxide and/or an aluminum oxide; (2) a reaction product obtained by the reaction of a magnesium halide and compound represented by the general formula Me(OR)nXz-n wherein Me represents an element of Groups I to IV in the Periodic Table, z represents the valence of the element Me, n is 0 < n ? z, X is a halogen atom, and R is a hydrocarbon radical having 1 to 20 carbon atoms; and (3) a titanium compound represented by the general formula Ti(OR)nX4-n wherein R is a hydrocarbon radical having 1 to 20 carbon atoms, X is a halogen atom, and n is 0 ? n ? 4, in the presence of a compound represented by the generalformula ROH wherein R is a hydrocarbon radical having 6 to 20 carbon atoms or an organic residue containing suchan element as oxygen, nitrogen, sulfur, or chlorine; and (II) an organoaluminum compound represented by the general formula AlRnX3-n wherein R is a hydrocarbon radical having 1 to 24 carbon atoms, X is a halogen atom, and n is 0 < n < 3.