Patent ID: 6410657
Filing Date: 2002-06-25
Classification: C08C,C08F

Abstract:
A method for the selective hydrogenation of polymer containing conjugated diene in hydrogenating the double bonds only in the conjugated dienes of polymer, which is selected from a homopolymer of conjugated diene monomer or a copolymer consisting of a conjugated diene monomer and aromatic vinyl monomer, wherein it comprises:1) at least one conjugated diene is individually polymerized or copolymerized to create a living polymer using an organolithium compound as initiator; 2) the end of the living polymer, so formed, is treated using an equimolar amount of an end-modifying material; and, 3) a monocyclopentadienyl titanium compound expressed by the following formula 1 and lithium hydride (LiH), so prepared via the reaction between an organolithium compound and hydrogen are added to the polymer in solution whose end is modified but lithium hydride may be added individually or in a mixed form with catalyst by premixing wherein, R1, R2, R3, R4 and R5, which may be same or different, are selected from hydrogen atoms and alkyl groups of 1Ëœ5 carbon atoms; X1, X2 and X3, which may be same or different, are selected from halogen atoms.