US 5,849,655 A · Polyolefin catalyst for polymerization of propylene and a method of making and using thereof

Abstract

A method of forming a polyolefin catalyst component which includes chlorinating magnesium ethoxide, and then treating the product first with an electron donor, particularly diethyl phthalate or di-isobutyl phthalate, at a relatively low donor level, and then second with a titanating agent, such as titanium tetrachloride, to produce a catalyst component. The catalyst component is activated with an aluminum alkyl cocatalyst. An external electron donor, such as an organosilane compound, is added for stereoselectivity control. The activated catalyst is used in the polymerization of olefins, particularly propylene, to obtain a polymer product with a broad molecular weight distribution.

Claims28

Dependent claims

A process of making a catalyst comprising:

a) selecting a catalyst component for the polymerization of propylene wherein the catalyst component comprises:
(1) the reaction product of a magnesium alkoxide of the formula M(OR).sub.2 wherein M is magnesium, O is oxygen and R is a hydrocarbyl having from 1 to 20 carbons atoms, and a halogenating agent;
(2) an electron donor wherein the electron donor is diethyl phthalate or di-isobutyl phthalate;
(3) a titanating agent;
b) contacting the catalyst component with an organoaluminum cocatalyst compound;
c) contacting the catalyst component with dicyclopentyldimethoxysilane as an external electron donor simultaneous with or after contacting the catalyst component with the organoaluminum compound.

3 more elements

Dependencies are inferred from the claim text.

Polyolefin catalyst for polymerization of propylene and a method of making and using thereof

Life of this patent

Polyolefin catalyst for polymerization of propylene and a method of making and using thereof

Life of this patent

Abstract

Claims28