Abstract: A radial multi-block copolymer contains a tapered block as represented by the following formula 1. The radial multi-block copolymer, which includes a polystyrene block, a poly(isoprene-styrene)tapered block, a polyisoprene block, and a polybutadiene block, can be used as an excellent pressure-sensitive adhesive material. (pA-pT-pB)m-X-n(pC-pB-pT-pA)??Formula 1 where pA is the polyvinyl aromatic block; pT is the poly(isoprene-styrene)tapered block; pB is the polyisoprene block; pC is the polybutadiene block; X is the residue of a multi-functional coupling agent used in preparation of the radial multi-block copolymer; m and n are integers equal to or greater than 1, representing the number of branches associated with X; and pT=pTA+pTB, where pTA is the pA component of pT, and pTB is the pB component of pT.

Abstract: A radial multi-block copolymer contains a tapered block as represented by the following formula 1. The radial multi-block copolymer, which includes a polystyrene block, a poly(isoprene-styrene)tapered block, a polyisoprene block, and a polybutadiene block, can be used as an excellent pressure-sensitive adhesive material. (pA-pT-pB)m-X-n(pC-pB-pT-pA)??Formula 1: where pA is the polyvinyl aromatic block; pT is the poly(isoprene-styrene)tapered block; pB is the polyisoprene block; pC is the polybutadiene block; X is the residue of a multi-functional coupling agent used in preparation of the radial multi-block copolymer; m and n are integers equal to or greater than 1, representing the number of branches associated with X; and pT=pTA+pTB, where pTA is the pA component of pT, and pTB is the pB component of pT.

Abstract: A radial multi-block copolymer contains a tapered block as represented by the following formula 1. The radial multi-block copolymer, which includes a polystyrene block, a poly(isoprene-styrene)tapered block, a polyisoprene block, and a polybutadiene block, can be used as an excellent pressure-sensitive adhesive material. (pA-pT-pB)m-X-n(pC-pB-pT-pA)??Formula 1: where pA is the polyvinyl aromatic block; pT is the poly(isoprene-styrene)tapered block; pB is the polyisoprene block; pC is the polybutadiene block; X is the residue of a multi-functional coupling agent used in preparation of the radial multi-block copolymer; m and n are integers equal to or greater than 1, representing the number of branches associated with X; and pT=pTA+pTB, where pTA is the pA component of pT, and pTB is the pB component of pT.

Abstract: Disclosed is a hetero-branched radial block copolymer suitable as a base polymer of pressure-sensitive adhesives, the hetero-branched radial block having a hetero-branched structure comprised of polystyrene, polyisoprene, and polybutadiene blocks and being represented by (pS-pI)3X-(pB-pI-pS) wherein pS is polystyrene; pI is polyisoprene; pB is polybutadiene; and X is a residue of a tetravalent coupling agent.

Abstract: A radial multi-block copolymer contains a tapered block as represented by the following formula 1. The radial multi-block copolymer, which includes a polystyrene block, a poly(isoprene-styrene)tapered block, a polyisoprene block, and a polybutadiene block, can be used as an excellent pressure-sensitive adhesive material. (pA-pT-pB)m-X-n(pC-pB-pT-pA)??Formula 1: where pA is the polyvinyl aromatic block; pT is the poly(isoprene-styrene)tapered block; pB is the polyisoprene block; pC is the polybutadiene block; X is the residue of a multi-functional coupling agent used in preparation of the radial multi-block copolymer; m and n are integers equal to or greater than 1, representing the number of branches associated with X; and pT=pTA+pTB, where pTA is the pA component of pT, and pTB is the pB component of pT.

Abstract: Disclosed is a hetero-branched radial block copolymer suitable as a base polymer of pressure-sensitive adhesives, the hetero-branched radial block having a hetero-branched structure comprised of polystyrene, polyisoprene, and polybutadiene blocks and being represented by (pS-pI)3X-(pB-pI-pS) wherein pS is polystyrene; pI is polyisoprene; pB is polybutadiene; and X is a residue of a tetravalent coupling agent.

Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hexa-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator, and a tri-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4). The bimodal linear block copolymer is prepared by adding more than one charge of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hepta-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4), and a tetra-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator. The bimodal linear block copolymer is prepared by adding several charges of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Abstract: The present invention relates to a method for preparing a copolymer containing a combined linear and nonlinear block, that is, mikto block, a copolymer prepared from the method, and usages of the copolymer. More particularly, the present invention provides a novel method for preparing a multi-component copolymer by polymerization using a multifunctional compound and one charge of an initiator, and a copolymer having a mikto block including different types of terminal blocks.

Abstract: The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl aromatic monomers and initiator to obtain vinyl aromatic polymer in the presence of solvent and polar organic compounds in the first reactor (1a); ii) continuously charging and polymerizing vinyl aromatic monomers and conjugated diene monomers to the vinyl aromatic polymer obtained in the first reactor to obtain tapered vinyl aromatic polymer chain in the presence of organic solvent in the second reactor (1b); iii) continuously charging and polymerizing vinyl aromatic monomers and multi-functional compounds to the vinyl aromatic polymer chain obtained in the second reactor to obtain high impact vinyl aromatic polymer in the presence of organic solvent in the third reactor (1c); and iv) terminating the reaction with terminator and removing the remaining hydrocarbon solvent and unreacted monomers to obtain transparen

Abstract: The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl aromatic monomers and initiator to obtain vinyl aromatic polymer in the presence of solvent and polar organic compounds in the first reactor (1a); ii) continuously charging and polymerizing vinyl aromatic monomers and conjugated diene monomers to the vinyl aromatic polymer obtained in the first reactor to obtain tapered vinyl aromatic polymer chain in the presence of organic solvent in the second reactor (1b); iii) continuously charging and polymerizing vinyl aromatic monomers and multi-functional compounds to the vinyl aromatic polymer chain obtained in the second reactor to obtain high impact vinyl aromatic polymer in the presence of organic solvent in the third reactor (1c); and iv) terminating the reaction with terminator and removing the remaining hydrocarbon solvent and unreacted monomers to obtain transparen

Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hepta-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4), and a tetra-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-tapered block(T2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator. The bimodal linear block copolymer is prepared by adding several charges of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hexa-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator, and a tri-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4). The bimodal linear block copolymer is prepared by adding more than one charge of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.

Abstract: The present invention relates to a method for preparing a copolymer containing a combined linear and nonlinear block, that is, mikto block, a copolymer prepared from the method, and usages of the copolymer. More particularly, the present invention provides a novel method for preparing a multi-component copolymer by polymerization using a multifunctional compound and one charge of an initiator, and a copolymer having a mikto block including different types of terminal blocks.

Abstract: A combined linear and nonlinear polymer (i.e., having a combined linear, branched and radial structure) P+PnD according to the present invention is represented by (P+PnD)−+Li, where P is a polymer of a monovinyl aromatic monomer or a conjugated diene monomer; PD is a nonlinear polymer having a combined linear, branched and radial structure due to a multifunctional compound D bonded to the polymer P; n is an integer ranging from 2 to 10 and represents the average number of bonds between the monovinyl aromatic or conjugated diene polymer P and the multifunctional compound D; and +Li represents a metal ion as a partner of the active anion (P+PnD)−. The combined linear and nonlinear polymer of the present invention, characterized by nonlinearity-related properties (i.e.

Abstract: A combined linear and nonlinear polymer (i.e., having a combined linear, branched and radial structure) P+PnD according to the present invention is represented by (P+PnD)−+Li, where P is a polymer of a monovinyl aromatic monomer or a conjugated diene monomer; PD is a nonlinear polymer having a combined linear, branched and radial structure due to a multifunctional compound D bonded to the polymer P; n is an integer ranging from 2 to 10 and represents the average number of bonds between the monovinyl aromatic or conjugated diene polymer P and the multifunctional compound D; and +Li represents a metal ion as a partner of the active anion (P+PnD)−. The combined linear and nonlinear polymer of the present invention, characterized by nonlinearity-related properties (i.e.

Abstract: This invention relates to a process for preparing a block copolymer composition, wherein it comprises following successive steps:a step in which a vinyl aromatic monomer is polymerized in a reactor in the presence of an inert hydrocarbon solvent and organolithium initiator until depletion of the monomer to generate a living polymer; a step in which a conjugated diene monomer is added to the above polymer to synthesize a living diblock copolymer; a step in which a portion of polymerization terminator is added to partially inactivate the living diblock copolymer; steps in which a conjugated diene monomer and aromatic vinyl monomer are sequentially added to generate a mixture of living triblock copolymer and inactivated diblock copolymer; a step in which a polymerization terminator is added to complete the reaction.