Patent ID: 6852809

Claim:
A catalyst for addition polymerization obtained by contacting: (A) a compound selected from the group consisting of compounds represented by the formulas (A1), (A2) and (A3): wherein M represents an atom of the Group II to the Group XII (with the proviso that Cu is excluded in (A3)) or Lanthanide series of the Periodic Table; X represents a hydrogen atom, a halogen atom, a hydrocarbon group or a hydrocarbon oxy group, and when a plural number of X's exist, they may be mutually the same or different; m represents a valence of M, wherein the M in which the lowest orbital level energy level of vacant unoccupied molecular orbital having the valence p-atomic p-type atomic orbital of valence electron orbital of the M as a main component wherein the coefficient represented by a linear bonding linear combination is 0.4 or more is calculated to be 0.008 atomic unit (Hartree) or less by the calculation of density functional method (B3LYP/3-21G level); with (B) a metal compound (B) selected from the group consisting of compounds represented by L a M 1 X b and μ-oxo type compounds thereof, wherein M 1 is a metal atom of the Group III to the Group XIII or Lanthanide series; L is a group having cyclopentadienyl type anion skeleton or a group containing a hetero atom; a plurality of L's may be linked directly, or through a residual group containing a carbon atom, a silicon atom, a nitrogen atom, an oxygen atom, a sulfur atom or a phosphorous atom; X is a halogen atom or a hydrocarbon group; “a” represents a number satisfying 0<a≦8; and “b” represents a number satisfying 0<b≦8.