Patent ID: 8822366

Claim:
A process for producing a solid titanium catalyst component (I) comprising titanium, magnesium, halogen and an ester compound which comprises: contacting a mixture of a magnesium compound (A) having no reducing ability in a liquid state and an ester compound (B) represented by the following formula (2) with a liquid titanium compound (C) to form a solid titanium composite, and then contacting the solid titanium composite with an ester compound (B1) represented by the formula (3), wherein the compound of formula (2) is: wherein n is an integer of 6, R 2 is COOR 1 , R 3 is R′ and the cyclic skeleton contains only single bonds, R 1 each is independently a monovalent hydrocarbon group having 2 or 3 carbon atoms, and A is heteroatom, and or a, two or more R′ each are independently an atom or 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, and at least two of the two or more R′ may be bonded to each other to form a ring, and the skeleton of the ring formed with the two or more R′ may include a double bond or a heteroatom, wherein the compound of formula (3) is: wherein n is 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 , wherein a single bond in the cyclic skeleton, excluding C a -C a bonds and C a -C b bonds, that R 3 is a hydrogen atom may be replaced with a double bond, two or more R 1 each are independently a monovalent hydrocarbon group having 1 to 20 carbon atoms, and A is heteroatom, and or a, two or more R′ each are independently an atom or 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, and at least two of the two or more R′ may be bonded to each other to form a ring, and the skeleton of the ring formed with the two or more R′ may include a double bond or a heteroatom.