Abstract: 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.

Abstract: The present invention relates to a process of preparing 1,4-trans polybutadiene grafted with an aromatic organosulfur compound, the process comprising (a) preparing 1,4-trans polybutadiene by polymerizing 1,3-butadiene or butadiene derivatives in a nonpolar solvent in the presence of a particular catalyst, and (b) preparing the 1,4-trans polybutadiene grafted with an aromatic organosulfur compound by reacting the trans polybutadiene with an aromatic organosulfur compound. The organosulfur molecule in the molecular chain minimizes ultra high molecular weight fraction and narrows the molecular weight distribution, thereby enabling this polymer to show improved processability and tensile properties.

Abstract: The present invention relates to a preparation method of aromatic organosulfur functionalized 1,4-cis polybutadiene comprising: polymerizing 1,3-butadiene or butadiene derivative in the presence of a specific catalyst in a nonpolar solvent to prepare 1,4-cis polybutadiene; and reacting the resultant polybutadiene with an aromatic organosulfur compound. Such prepared aromatic organosulfur functionalized 1,4-cis polybutadiene is without ultrahigh molecular weight region and, thus, has narrow molecular weight distribution.

Abstract: Provided are a molecular weight controllable, high 1,4-trans polybutadiene catalyst system, and more particularly, a four-component catalyst for preparing 1,4-trans polybutadiene with high yield, the catalyst comprising a cobalt compound, an organoaluminum compound, a phenol-based compound, and a phosphorus-based compound used to prepare 1,4-trans polybutadiene by polymerizing butadiene or a butadiene derivative, and capable of controlling the molecular weight of 1,4-trans polybutadiene by regulating the amount of the phosphorus-based compound. In particular, 1,4-trans polybutadiene may be efficiently applied to tires, belts, or the like since it has excellent tensile strength, tear strength, and cut & chip properties with increasing processability.

Abstract: Disclosed are 1,4-polybutadiene functionalized with an aromatic organosulfur compound, providing improved processability due to decreased Mooney viscosity and providing improved feel on hitting and flying performance due to decreased compression and increased restitution when used to prepare a golf ball core, and a composition for the preparation of a golf ball core including the same.

Abstract: Provided are a molecular weight controllable, high 1,4-trans polybutadiene catalyst system, and more particularly, a four-component catalyst for preparing 1,4-trans polybutadiene with high yield, the catalyst comprising a cobalt compound, an organoaluminum compound, a phenol-based compound, and a phosphorus-based compound used to prepare 1,4-trans polybutadiene by polymerizing butadiene or a butadiene derivative, and capable of controlling the molecular weight of 1,4-trans polybutadiene by regulating the amount of the phosphorus-based compound. In particular, 1,4-trans polybutadiene may be efficiently applied to tires, belts, or the like since it has excellent tensile strength, tear strength, and cut & chip properties with increasing processability.

Abstract: The present invention relates to a process of preparing 1,4-trans polybutadiene grafted with an aromatic organosulfur compound, the process comprising (a) preparing 1,4-trans polybutadiene by polymerizing 1,3-butadiene or butadiene derivatives in a nonpolar solvent in the presence of a particular catalyst, and (b) preparing the 1,4-trans polybutadiene grafted with an aromatic organosulfur compound by reacting the trans polybutadiene with an aromatic organosulfur compound. The organosulfur molecule in the molecular chain minimizes ultra high molecular weight fraction and narrows the molecular weight distribution, thereby enabling this polymer to show improved processability and tensile properties.

Abstract: The present invention relates to a preparation method of aromatic organosulfur functionalized 1,4-cis polybutadiene comprising: polymerizing 1,3-butadiene or butadiene derivative in the presence of a specific catalyst in a nonpolar solvent to prepare 1,4-cis polybutadiene; and reacting the resultant polybutadiene with an aromatic organosulfur compound. Such prepared aromatic organosulfur functionalized 1,4-cis polybutadiene is without ultrahigh molecular weight region and, thus, has narrow molecular weight distribution.

Abstract: The present invention relates to a novel catalyst for diene polymerization comprising a heteroleptic single-molecule aluminum compound and a cobalt compound having a carboxyl group with a predetermined proportion and a method for preparing polybutadiene from 1,3-butadiene using a catalyst for diene polymerization. The novel catalyst of the present invention, which comprises a heteroleptic single-molecule aluminum compound with a huge stereostructure and a cobalt compound, has a stabilized catalytic active site without the need of adding a special material for controlling the activity of cobalt, such as water, phenol, alcohol, and phosphorus compound, and has good activity without a catalyst aging process since the reduction of cobalt is minimized. Consequently, the catalyst may be used to polymerize 1,3-butadiene to obtain polybutadienes having cis and trans structures with good yield and narrow molecular weight distribution.

Abstract: Disclosed is a novel high 1,4-cis polybutadiene-polyurethane copolymer and a preparation method thereof. The present invention provides a high 1,4-cis polybutadiene-polyurethane copolymer represented by the following formula 1 and having an average molecular weight of at least 100,000, and a method for preparing the high 1,4-cis polybutadiene-polyurethane copolymer that includes polymerizing 1,3-butadiene or butadiene derivatives with a catalyst comprising a rare earth compound, a halogen-containing compound and an organoaluminum compound in the presence of a non-polar solvent, to prepare a polybutadiene having a high 1,4-cis content of at least 95%; and then introducing a polyurethane group to the polybutadiene.

Abstract: The present invention relates to a method for preparing a high 1,4-cis polybutadiene having a controlled cold flow and, more particularly, to a novel method for preparing a high 1,4-cis polybutadiene having a controlled cold flow that involves initiating polymerization of a 1,3-butadiene in the presence of a non-polar solvent using, as a polymerization catalyst, a complex prepared by mixing a neodymium compound with or without a conjugated diene compound, a halogenated organoaluminum compound or a halogenated organic compound, and an organoaluminum compound irrespective of the addition order of the catalyst; and adding an organoborane compound as a cold flow controller of 1,4-cis polybutadiene after a predetermined time of the polymerization. Accordingly, a high 1,4-cis polybutadiene having an efficiently controlled cold flow can be prepared without causing a significant increase in the Mooney viscosity (molecular weight), an odor (bad smell), and a reduction in 1,4-cis content and polymerization yield.

Abstract: Disclosed is a novel high 1,4-cis polybutadiene-polyurethane copolymer and a preparation method thereof. The present invention provides a high 1,4-cis polybutadiene-polyurethane copolymer represented by the following formula 1 and having an average molecular weight of at least 100,000, and a method for preparing the high 1,4-cis polybutadiene-polyurethane copolymer that includes polymerizing 1,3-butadiene or butadiene derivatives with a catalyst comprising a rare earth compound, a halogen-containing compound and an organoaluminum compound in the presence of a non-polar solvent, to prepare a polybutadiene having a high 1,4-cis content of at least 95%; and then introducing a polyurethane group to the polybutadiene.

Abstract: The present invention relates to a method for preparing a high 1,4-cis polybutadiene having a controlled cold flow and, more particularly, to a novel method for preparing a high 1,4-cis polybutadiene having a controlled cold flow that involves initiating polymerization of a 1,3-butadiene in the presence of a non-polar solvent using, as a polymerization catalyst, a complex prepared by mixing a neodymium compound with or without a conjugated diene compound, a halogenated organoaluminum compound or a halogenated organic compound, and an organoaluminum compound irrespective of the addition order of the catalyst; and adding an organoborane compound as a cold flow controller of 1,4-cis polybutadiene after a predetermined time of the polymerization. Accordingly, a high 1,4-cis polybutadiene having an efficiently controlled cold flow can be prepared without causing a significant increase in the Mooney viscosity (molecular weight), an odor (bad smell), and a reduction in 1,4-cis content and polymerization yield.

Abstract: Disclosed is a process of controlling the degree of branch of high 1,4-cis polybutadiene without any alternation in the 1,4-cis content and the polymerization yield, in which a dialkylzinc compound represented by the following formula I is added in a controlled amount as an agent for controlling the degree of branch of high 1,4-cis polybutadiene, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose. R1—Zn—R2  Formula I wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.

Abstract: A method for preparing polybutadiene having controlled molecular weight and high 1,4-cis content over 95% in the presence of a diethylzinc compound as a cocatalyst (i.e., alkylating agent) and molecular-weight-controlling agent, in which the molecular weight of the polybutadiene is controlled by variating the added amount of the diethylzinc compound without deterioration of 1,4-cis content nor polymerization yield, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose.

Abstract: The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does not contain water, bases and salts. NdHA4 is mixed with a halogen compound and an organic metal compound to prepare a catalyst system. The catalyst system in the polymerization of 1,3-butadiene (BD) or isoprene produces high cis polydiene with a high activity (100 g BD/4.0×10−5 mole Nd) and without gel formation. The polydiene thus obtained is useful for tires and golf balls and as a polystyrene modifier.

Abstract: The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does not contain water, bases and salts. NdHA4 is mixed with a halogen compound and an organic metal compound to prepare a catalyst system. The catalyst system in the polymerization of 1,3-butadiene (BD) or isoprene produces high cis polydiene with a high activity (100 g BD/4.0×10−5 mole Nd) and without gel formation. The polydiene thus obtained is useful for tires and golf balls and as a polystyrene modifier.

Abstract: The invention is related to a novel compound represented by NdHA4 wherein A is a carboxylate, and to a diene polymerization catalyst using the novel compound. NdHA4 has monomeric structure and does not contain water, bases and salts. NdHA4 is mixed with a halogen compound and an organic metal compound to prepare a catalyst system. The catalyst system in the polymerization of 1,3-butadiene (BD) or isoprene produces high cis polydiene with a high activity (100 g BD/4.0×10−5 mole Nd) and without gel formation. The polydiene thus obtained is useful for tires and golf balls and as a polystyrene modifier.

Abstract: This invention relates to a process for preparation of high 1,4-cis polybutadiene and more particularly, to the process for preparing polybutadiene by polymerizing 1,3-butadiene monomer in the presence of a catalyst prepared by aging a mixture of a neodymium salt compound, a nickel salt compound, an organoaluminium compound and a borontrifluoride complex compound in the presence or absence of a conjugated diene compound. With much remarked catalytic activity, polybutadiene with a very high 1,4-cis content can be prepared in a high yield using a small amount of catalyst.

Abstract: A method for preparing polybutadiene having controlled molecular weight and high 1,4-cis content over 95% in the presence of a diethylzinc compound as a cocatalyst (i.e., alkylating agent) and molecular-weight-controlling agent, in which the molecular weight of the polybutadiene is controlled by variating the added amount of the diethylzinc compound without deterioration of 1,4-cis content nor polymerization yield, thus guaranteeing the optimum processability and physical properties of polymer according to the use purpose.