MODIFIED CONJUGATED DIENE-BASED POLYMER, RUBBER COMPOSITION, TIRE, AND METHOD OF PRODUCING MODIFIED CONJUGATED DIENE-BASED POLYMER

Provided is a modified conjugated diene-based polymer, a rubber composition and a tire with excellent low loss property and durability, and a method of producing a modified conjugated diene-based polymer with which the presently disclosed modified conjugated diene-based polymer can be produced. The modified conjugated diene-based polymer has two or more modifying groups in one modified conjugated diene-based polymer molecule, where the modifying groups between molecules have a non-covalent bond with energy of 10 kJ/mol to 250 kJ/mol. The rubber composition contains the modified conjugated diene-based polymer. The tire uses the rubber composition. The method of producing a modified conjugated diene-based polymer includes (i) anionically polymerizing at least a conjugated diene compound in presence of an alkali metal compound to form a conjugated diene-based polymer, (ii) further adding an alkali metal compound to the conjugated diene-based polymer, and (iii) reacting the product obtained in (ii) with a modifying agent to introduce a modifying group into the conjugated diene-based polymer.