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Abstract

Disclosed is a cyclic conjugated diene polymer comprising a main chain represented by the formula (I): ##STR1## wherein A to E are monomer units constituting the main chain in which A to E are arranged in any order, and l to p are, respectively, weight percentages of A to E, based on the total weight of A to E; A is selected from cyclic conjugated diene monomer units, B is selected from chain conjugated diene monomer units, C is selected from vinyl aromatic monomer units, D is selected from polar monomer units, and E is selected from an ethylene monomer unit and .alpha.-olefin monomer units; and l to p satisfy the following requirements: 0.5.ltoreq.l.ltoreq.100, 0.ltoreq.m, n, o, p<100, wherein when l=100 and the A monomer units are comprised of monomer units which are the same, the polymer has a number average molecular weight Mn of from 40,000 to 5,000,000, wherein when l=100 and the A monomer units are comprised of monomer units which are different, the polymer has an Mn of from 25,000 to 5,000,000, and wherein when 0.5.ltoreq.l<100, the polymer has an Mn of from 500 to 5,000,000. The cyclic conjugated diene polymer has excellent thermal and mechanical properties. The polymer can be advantageously produced using a catalyst comprised of a complex of an organometallic compound containing a Group IA metal with a complexing agent, especially an amine.

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First Claim