Patent ID: 6777493
Filing Date: 2004-08-17
Classification: C08F,C08G

Abstract:
A radial styrene-diene block copolymer having a formula 1, made by copolymerizing styrene and diene using an organic lithium initiator in the presence of an organic solvent which does not react with the organic lithium and then end-modifying the resulting copolymer using &agr;,&ohgr;-bis(2-trichlorosilylethyl)polydimethylsiloxane as a coupling agent:wherein (PS-PD)3Siâ€”CH2CH2â€”[SiO(CH3)2â€”]nSi (CH3)2Râ€ƒâ€ƒFormula 1 wherein, PS is polystyrene, PD is polydiene such as polyisoprene or polyisoprene-polybutadiene, R is hydroxy group or -(PD-PS), and n is an integer of 1 to 100.