Selective partial hydrogenation of conjugated diolefin polymers

Details Selective partial hydrogenation of conjugated diolefin polymers Selective partial hydrogenation of conjugated diolefin polymers

1992-08-10

1993-09-07

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...

5253329, 5253331, 525338, 525339, C08F 804

Patent

active

052429865

ABSTRACT:
This is a process for the partial hydrogenation of conjugated diolefin polymers which comprises polymerizing at least one conjugated diolefin with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer comprising (1) ethylenic unsaturation between backbone carbons wherein at least one of the doubly bound backbone carbons is substituted and (2) ethylenic unsaturation which is not between doubly bound backbone carbons wherein at least one is substituted, terminating the polymerization, and effecting selective hydrogenation of the ethylenic unsaturation in the conjugated diolefin units of the terminated polymer which is not between doubly bound backbone carbons wherein at least one is substituted, by contacting the polymer with hydrogen in the presence of no more than 0.02 mM of catalyst per gram of polymer of a bis(cyclopentadienyl)titanium catalyst.

REFERENCES:
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patent: 5017660 (1991-05-01), Hattori et al.
patent: 5039755 (1991-08-01), Chamberlain et al.
"Coordination Catalysts for the Selective Hydrogenation of Polymeric Unsaturation" by John C. Falk, Journal of Polymer Science: Part A-1, vol. 9, pp. 2617-2623 (1971).

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