Polymerization catalyst, copolymer, polymer composition, and crosslinked polymer
Provided is a polymerization catalyst including a metal complex obtained by mixing at least one ketimine derivative selected from the group consisting of a β-ketimine compound and a tautomer thereof with a compound having at least one metal selected from among Group 4 and 5 transitional metals, an organoaluminum compound, and a halogen compound.
1. A polymerization catalyst, comprising
a metal complex obtained by mixing at least one ketimine derivative selected from the group consisting of a β-ketimine compound and a tautomer thereof with a compound having at least one transition metal selected from Group 4 and 5 transitional metals;
an organoaluminum compound; and
a halogen compound,
wherein the β-ketimine compound, if present, is a compound represented by formula (1):
wherein R 1 to R 4 each represent a hydrocarbyl group which is optionally substituted by a halogen atom.
2. A method for producing a copolymer, the method comprising:
conducting polymerization reaction between a conjugated diene compound and a C3 to C8 α-olefin in the presence of a polymerization catalyst wherein the polymerization catalyst comprises:
a metal complex obtained by mixing at least one ketimine derivative selected from the group consisting of a β-ketimine compound and a tautomer thereof with a compound having at least one transition metal selected from Group 4 and 5 transitional metals;
an organoaluminum compound; and
a halogen compound.
3. The method according to claim 2 , wherein the polymerization reaction is performed at a temperature of from −50° C. to 50° C.