Patent KR-20080065868-A (KR)
Title: Method for preparing transition metal complexes, transition metal complexes prepared using the mathod, catalysts composition containing the complexes
Inventor: LEE CHOONG HOON
IPC: C07F7/28
Filed: 2007-01-10
Abstract: A method for preparing a transition metal compound is provided to obtain the transition metal compound simply with high yield by blocking a side reaction of N using a compound including a protecting group. A transition metal compound is provided to maintain a firm pentagonal ring structure around a metal site by an amido group linked to a phenylene bridge and allow monomers to approach easily. A catalyst composition comprising the transition metal compound is provided to be applied for co-polymerization of ethylene and a highly hindered monomers, thereby preparing a linear polyolefin with low density and a polyolefin copolymer with ultra-low density. A method for preparing a transition metal compound comprises the steps of: (a) after reacting an amine-based compound represented by a formula(1) with alkyl lithium, adding a compound including a protecting group R0 thereto to prepare a compound represented by a formula(2); (b) after reacting the compound of the formula(2) with alkyl lithium, adding a ketone based compound represented by a formula(3) to prepare an amine-based compound represented by a formula(4); (c) reacting the compound of the formula(4) with n-butyl lithium to prepare a di-lithium compound represented by a formula(5); and (d) reacting a compound of the formula(5) with MCl4(where M is Ti, Zr or Hf) and an organic lithium compound to prepare a transition metal compound represented by a formula(6), wherein R0 is a protecting group; each R1, R2, R3 and R4 is independently H, silyl, C1-20 alkyl, C5-20 aryl, C2-20 alkenyl, C6-20 alkylaryl, C6-20 arylalkyl, or a metalloid of a group XIV metal substituted with C1-20 hydrocarbyl, or at least two of the R1, R2, R3 and R4 may be linked to each other by C1-20 alkylidene including C1-20 alkyl or C5-20 aryl to form a ring; each R5, R6, R7 and R8 is independently H, halogen, C1-20 alkyl, or C5-20 aryl, or at least two of the R5, R6, R7 and R8 may be linked to each other to form C5-20 aliphatic or aromatic ring; R9 is H, C1-20 branched, linear or cyclic alkyl, or C5-20 aryl, or the R8 and R8 may be linked to each other to form C5-20 aliphatic or aromatic ring; M is a group IV transition metal; and each Q1 and Q2 is independently halogen, C1-20 alkyl amino, C5-20 arylamido, C1-20 alkyl, C2-20 alkenyl, C5-20 aryl, C6-20 alkylaryl, C6-20 arylalkyl, or C1-20 alkylidene. A catalyst composition comprises the transition metal compound of the formula(6) and at least one co-catalyst compound selected from the group consisting of a compound represented by a formula(10) of -[Al(R22)O]a-(wherein R22 is halogen, C1-20 hydrocarbyl, or halogen substituted C1-20 hydrocarbyl, and a is an integer of at least 2), a compound represented by a formula(11) of D(R22)3(where D is Al or B, and the R22 is the same as defined above), and a compound represented by a formula(12) of [L-H]^+[Z(A)4]^- or [L]^+[Z(A)4]^-(where L is neutral or cationic lewis acid; H is hydrogen atomic value; Z is a group XIII element; A is C6-20 aryl or C1-20 alkyl which may be substituted with at least one substituent selected from the group consisting of halogen, C1-20 hydrocarbyl, C1-20 alkoxy or C6-20 aryloxy).