Polymerization Catalyst Composition and Process for Production of Polymer

A transition metal-containing phosphazenium composition obtained by mixing a phosphazenium compound represented by the following general formula (1) with at least one kind of compound of a transition metal belonging to Group 4 to Group 12 in the periodic table represented by the following general formula (2),

• (wherein in the formula, n is an integer of 1 or more and represents the number of phosphazenium cations and Zn− represents an anion of an active hydrogen compound in a form derived from an active hydrogen compound having n active hydrogen atoms, from which n protons are eliminated;
• a, b, c and d are each a positive integer of 3 or less or 0 with the proviso that they are not all 0 simultaneously;
• R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 and R24 may be identical or different and each represent a hydrocarbon group having 1 to 10 carbon atoms;
• R1 and R2, R3 and R4, R5 and R6, R7 and R8, R9 and R10, R11 and R12, R13 and R14, R15 and R16, R17 and R18, R19 and R20, R21 and R22 and R23 and R24 may be linked together to form a ring;)
• LpMm+(Xr−)q (2)
• (wherein in the formula, L represents a neutral ligand, p represents the number of neutral ligands and is 0 or an integer of from 1 to 8;
• M represents a transition metal belonging to Group 4 to Group 12 in the periodic table, m represents the valency of transition metal M and is an integer of from 1 to 8;
• Xr− represents an anion in a form derived from deprotonation of an active hydrogen compound, q represents the number of anions and is an integer of from 1 to 8;
• r represents the valency of the anion and is an integer of from 1 to 8;
• and the relationship among m, r and q is represented by m=r×q.)