Disclosed are a rubber polymer including a unit structure derived from a conjugated diene-based monomer and at least one of compounds represented by Chemical Formula 1 to Chemical Formula 4, a method of preparing the same, and a rubber composition including the same.

The present invention relates to a modification initiator and a modified conjugated diene-based polymer including the same, and more particularly, the present invention provides a modification initiator including a compound represented by Formula 1, a modified conjugated diene-based polymer including the same, and a method of preparing a modified conjugated diene-based polymer.

The present invention relates to a modification initiator and a modified conjugated diene-based polymer including the same, and more particularly, the present invention provides a modification initiator including a compound represented by Formula 1, a modified conjugated diene-based polymer including the same, and a method of preparing a 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.

The diimide hydrogenation of unsaturated elastomers in latex utilizing hydrazine and hydrogen peroxide or oxygen, is a metal-catalyzed process. Copper ion has been found to be the most superior catalyst for this reaction, requiring an extremely low concentration for optimal results. Generated diimide efficiently hydrogenates the polymer olefinic unsaturation while generating water and nitrogen as byproducts. With a falling hydrazine concentration during the hydrogenation process however, a competing copper-catalyzed process capable of generating hydroxyl, superoxide and/or copper-oxyl radicals becomes increasingly competitive. The ability of these radical species to abstract hydrogen from the polymer backbone to generate polymeric radicals, ultimately results in crosslinking that occurs concurrently with hydrogenation. The concept of an OH radical inactivating ligand (OIL) complexed with copper is demonstrated to ameliorate the crosslinking reaction.

The diimide hydrogenation of unsaturated elastomers in latex utilizing hydrazine and hydrogen peroxide or oxygen, is a metal-catalyzed process. Copper ion has been found to be the most superior catalyst for this reaction, requiring an extremely low concentration for optimal results. Generated diimide efficiently hydrogenates the polymer olefinic unsaturation while generating water and nitrogen as byproducts. With a falling hydrazine concentration during the hydrogenation process however, a competing copper-catalyzed process capable of generating hydroxyl, superoxide and/or copper-oxyl radicals becomes increasingly competitive. The ability of these radical species to abstract hydrogen from the polymer backbone to generate polymeric radicals, ultimately results in crosslinking that occurs concurrently with hydrogenation. The concept of an OH radical inactivating ligand (OIL) complexed with copper is demonstrated to ameliorate the crosslinking reaction.

To provide a conjugated diene graft polymer having high transparency, heat resistance and weather resistance, and a method for producing the conjugated diene graft polymer. A method for producing a conjugated diene graft polymer in which a side chain (b) including a polymer including at least one monomer unit selected from the group consisting of a conjugated diene unit and an aromatic vinyl compound unit is bonded to a main chain (a) including a polymer including a conjugated diene unit, via a hetero atom Z serving as a branching point and having a valence of not less than 3, the method including a step of reacting a specific active end polymer and a specific functional group-modified conjugated diene polymer having a functional group in a side chain to thereby produce a conjugated diene graft polymer; and a step of recovering the conjugated diene graft polymer obtained.

To provide a conjugated diene graft polymer having high transparency, heat resistance and weather resistance, and a method for producing the conjugated diene graft polymer. A method for producing a conjugated diene graft polymer in which a side chain (b) including a polymer including at least one monomer unit selected from the group consisting of a conjugated diene unit and an aromatic vinyl compound unit is bonded to a main chain (a) including a polymer including a conjugated diene unit, via a hetero atom Z serving as a branching point and having a valence of not less than 3, the method including a step of reacting a specific active end polymer and a specific functional group-modified conjugated diene polymer having a functional group in a side chain to thereby produce a conjugated diene graft polymer; and a step of recovering the conjugated diene graft polymer obtained.

The present invention relates to a modified conjugated diene-based polymer, and more particularly, to a modified conjugated diene-based polymer prepared by continuous polymerization and having a specific polymer structure and molecular weight distribution degree and shape, and thus, having remarkable processability and narrow molecular weight distribution, and thus, having excellent physical properties, and a rubber composition including the same.

The invention relates to a method for producing a modified conjugated diene-based polymer, comprising a step of reacting an organometallic compound with a unit based on a modifying agent, in a conjugated diene-based polymer that has a unit based on a conjugated diene compound-containing monomer and a unit based on a modifying agent having a silicon atom, tin atom, germanium atom or phosphorus atom.