Selective hydrogenation of conjugated diolefin poylmers

Details Selective hydrogenation of conjugated diolefin poylmers Selective hydrogenation of conjugated diolefin poylmers

1991-12-20

1992-12-22

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253308, 5253309, 5253331, 5253332, 525338, 525339, C08F 804

Patent

active

051735377

ABSTRACT:
This is an improvement in a process for the hydrogenation of conjugated diolefin polymers which comprises polymerizing or copolymerizing at least one conjugated diolefin with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer, terminating the polymerization by the addition of hydrogen, thereby generating an alkali metal hydride, and effecting selective hydrogenation of the unsaturated double bonds in the conjugated diolefin units of the terminated polymer by contacting the polymer, in the absence of hydrocarbon lithium and alkoxy lithium compounds, with hydrogen in the presence of at least one bis(cyclopentadienyl)titanium compound. The improvement comprises treating the polymer, before hydrogenation, with a reagent to increase catalyst activity, the reagent being such that it will react with the alkali metal hydride present in the polymer.

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patent: 5017660 (1991-05-01), Hattori et al.
patent: 5039755 (1991-08-01), Chamberlain et al.

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