Patent ID: 8383541

Claim:
A solid titanium catalyst component (I) for ethylene polymerization, wherein the component (I) is obtained by bringing a liquid magnesium solution (A) comprising a magnesium compound, an electron donor (a), and an electron donor (b) into contact with a liquid titanium compound (C) under the presence of an electron donor (B) and wherein the component (I) comprises titanium, magnesium and a halogen, wherein the electron donor (a) is an alcohol having 1 to 5 carbon atoms, and the electron donor (b) is an alcohol having 6 to 30 carbon atoms wherein the electron donor (B) is a compound represented by the following Formula (2): wherein in Formula (2), C a and C b represent a carbon atom; n represents an integer of 5 to 10; R 2 and R 3 each are independently COOR 1 or R′, and at least one of R 2 and R 3 is COOR 1 ; in a cyclic framework, any carbon-carbon bond other than a C a -C a bond and a C a -C b bond when R 3 is a hydrogen atom may be substituted with a double bond; a plurality of R 1 is a hydrocarbon group having 1 to 20 carbon atoms; a plurality of R′ each is independently an atom or a group selected from a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms, a halogen atom, a nitrogen-containing group, an oxygen-containing group, a phosphorus-containing group, a halogen-containing group and a silicon-containing group; A is a structure represented by the following formula or a hetero atom excluding an oxygen atom: wherein a plurality of R′ is the same as R′ described above; a ring formed by C a , C b and A is a saturated alicyclic structure, 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.