Title: Process for hydrogenating a conjugated diene polymer
Application Number: 98814229 Application Date: 1998.12.18
Publication Number: 1314919 Publication Date: 2001.09.26
Approval Pub. Date: 2004.07.21 Granted Pub. Date: 2004.07.21
International Classifi-cation: C07F17/00;C08C19/02;C08F8/04;C08F36/04
Applicant(s) Name: Korea Kumho Phtrochemical Co., Ltd. Address:
Inventor(s) Name: Ko Young Hoon;Kim Hoo Chae;Cheong Seon Kyeong
Attorney & Agent: guo xiaodong
Abstract:
    This invention relates to a process for selectively hydrogenating the unsaturated double bonds of conjugated diene units of a homopolymer or copolymer. By using a highly active novel homogeneous organo titanium catalyst represented by formula (I) and lithium hydride (LiH) prepared in solution of organo lithium compound and hydrogen as a reducing agent, a polymer could be hydrogenated with significantly high yield and good reproducibility. In addition, this invention is characterized by a novel method in that when a copolymer containing a conjugated diene and vinyl-substituted aromatic hydrocarbon, the unsatured double bonds of conjugated diene units are selectively hydrogenated. In said formula where, Cp is a cyclopentadienyl group (C5H5); R1 and R2 are the same or different and are selected from halogen atom; R3 and R4 are the same of different and are selected from hydrogen atoms, alkyl or alkoxy group containing 1 to 12 carbon atoms, aryl or aryloxy groups containing 6 to 20 carbon atoms and cycloalkyl groups containing 6 to 20 carbon atoms.
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