Method for hydrogenation of polymer
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsYasushi Kishimoto, Hideo Morita
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Abstract
Selective hydrogenation of unsaturated double bonds in conjugated diene units of a conjugated diene polymer resulting from polymerization of copolymerization of a conjugated diene is effected by a method which comprises hydrogenating the conjugated diene polymer in an inert solvent in the presence of: (A) at least one bis-(cyclopentadienyl) titanium compound or (B) at least one hydrocarbon lithium compound containing at least one lithium atom in addition to (A) the aforementioned at least one bis-(cyclopentadienyl) titanium compound as a catalyst (providing that the presence of both the two components, (A) and (B), is essential where the conjugated diene polymer under treatment is other than a living polymer containing a lithium atom in the polymer chain thereof).
Claims31
A method for the hydrogenation of a conjugated diene polymer in an inert organic solvent, said polymer being obtained by polymerization or copolymerization of a conjugated diene, which comprises effecting selective hydrogenation of unsaturated double bonds in the conjugated diene units of said conjugated diene polymer in the presense of:
- (A) at least one bis-(cyclopentadienyl)titanium compound represented by the formula:
- ##STR4## wherein R and R' denote the same or different moieties selected from the group consisting of C.sub.1 -C.sub.8 alkyl and alkoxy groups, C.sub.6 -C.sub.8 aryl, aryloxy, aralkyl and cycloalkyl groups, halogen groups, and carbonyl groups, and
- (B) at least one hydrocarbon lithium compound having at least one lithium atom ion
- as catalysts, with the molar ratio of lithium atoms to titanium atoms being from 0.1 to 100.
Dependencies are inferred from the claim text.