Catalyst and process for producing olefin polymers or copolymers.

摘要

A catalyst for use in producing olefin polymers or copolymers comprising (A) a solid titanium catalyst component having magnesium, halogen, titanium, phosphorus and a carboxylic acid ester and (B) an organometallic compound of a metal of Groups I to III of Mendelejeff's periodic table provides improved results, in that stereoregular products can be obtained over a wide range of melt flow indices, when the solid titanium catalyst component (A) is one in which the molar ratio of the phosphorus to the carboxylic acid ester is from 0.05:1 to 2:1 and which has a specific surface area of not less than 40 m<2>/g, and also contains (C) an electron donor.
The catalyst can be used to produce an olefin polymer or copolymer by polymerizing an alpha-olefin having at least 3 carbon atoms or copolymerizing at least two such alpha-olefins or such an alpha-olefin with up to 20 mole% of ethylene and/or a diene.