| 摘要 |
A cyclic conjugated diene polymer having a polymer main chain represented by general formula (I), wherein A through E represent each a monomer unit constituting the polymer main chain and the monomer units may be arranged in any order; l through p represent, respectively, the weight percentages of the monomer units A through E based on the total weight of the main chain; A represents a cyclic conjugated diene monomer unit; B represents a chain conjugated diene monomer unit; C represents a vinylaromatic monomer unit; D represents a polar monomer unit; E represents an ethylene and/or alpha -olefin monomer unit; 0.5 </= l < 100, 0 </= m < 100, 0 </= n < 100, 0 </= o < 100, and 0 </= p < 100; and the number-average molecular weight of the cyclic conjugated diene polymer is 40,000 to 5,000,000 when l=100 and is 25,000 to 5,000,000 when 0.5 </= l < 100. This polymer and a polymer composition containing the same are excellent in thermal and mechanical properties. The polymer can advantageously be produced in the presence of a polymerization catalyst comprising a mono-, di- or polynuclear complex prepared from an organometallic compound of a group IA metal and a complexing agent, in particular, one containing an amine. The above di- and polynuclear complex catalysts are novel anionic polymerization catalysts and have wide uses.
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