Solid titanium catalyst component for ethylene polymerization, ethylene polymerization catalyst and ethylene polymerization method

摘要

Provided are a solid titanium catalyst component for ethylene polymerization which can polymerize ethylene at a high activity and which can provide an ethylene polymer having an excellent particle property, an ethylene polymerization catalyst and an ethylene polymerization method in which the catalyst is used.;The solid titanium catalyst component (I) for ethylene polymerization according to the present invention is obtained by bringing a liquid magnesium compound (A) including a magnesium compound, an electron donor (a) having 1 to 5 carbon atoms and an electron donor (b) having 6 to 30 carbon atoms into contact with a liquid titanium compound (C) under the presence of an electron donor (B) and includes titanium, magnesium and a halogen. The ethylene polymerization catalyst of the present invention includes the component (I) and an organic metal compound catalyst component (II). Further, the ethylene polymerization method of the present invention is a method for polymerizing ethylene under the presence of the catalyst.

主权项

1. A solid titanium catalyst component (I) that comprises magnesium, titanium, and a halogen for ethylene polymerization, wherein the catalyst component (I) is obtained by bringing a liquid magnesium compound (A) comprising a magnesium compound, an electron donor (a) having 1 to 5 carbon atoms and an electron donor (b) having 6 to 30 carbon atoms into contact with a liquid titanium compound (C) under the presence of an electron donor (B),
wherein bringing the liquid magnesium compound (A) into contact with the liquid titanium compound (C) under the presence of the electron donor (B) is performed by bringing a mixture into contact with the liquid titanium compound (C) wherein the mixture is a liquid obtained by mixing in advance the liquid magnesium compound (A) with the electron donor (B), wherein the electron donor (B) is a mixture of a benzoic acid ester having 8 to 18 carbon atoms and a diether compound represented by the following formula (3): wherein in formula (3), m represents an integer of 1 to 10; R11, R12 and R31 to R36 each are independently a hydrogen atom or a substituent having at least one element selected from carbon, hydrogen, oxygen, fluorine, chlorine, bromine, iodine, nitrogen, sulfur, phosphorus, boron and silicon; any one of R11, R12 and R31 to R36 may be linked together to form a ring other than a benzene ring, and a main chain may contain an atom other than carbon, wherein a molar ratio between the electron donor (b) and a titanium atom each contained in the solid titanium catalyst component (I) is 0.2 to 10.