Patent ID: 6894130

Claim:
A catalyst for addition polymerization obtained by contacting (A), (B) and (C) described below: (A) an organoaluminum compound, (B) one or more of boron compounds selected from (B1) to (B3) below; (B1) a boron compound represented by the general formula BQ 1 Q 2 Q 3 , (B2) a boron compound represented by the general formula G + (BQ 1 Q 2 Q 3 Q 4 ) − , and (B3) a boron compound represented by the general formula (L—H) + (BQ 1 Q 2 Q 3 Q 4 ) − (wherein each of Q 1 to Q 4 is independently a halogen atom, a hydrocarbon group, a halogenated hydrocarbon group, a heterocyclic group, a substituted silyl group, an alkoxy group, or a di-substituted amino group, and they may be the same or different; G + is an inorganic, organic or organometallic cation; L is a neutral Lewis base, and (L—H) + is a Brφnsted acid), and (C) a solid inorganic compound.