Process for selective hydrogenation of conjugated diolefin polym

Details Process for selective hydrogenation of conjugated diolefin polym Process for selective hydrogenation of conjugated diolefin polym

1992-07-01

1993-04-27

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...

5253328, 5253329, 5253331, 5253332, 525339, C08F 804

Patent

active

052063070

ABSTRACT:
This is an improved 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 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 is the use of an alkyl benzoate as a promoter in the hydrogenation step.

REFERENCES:
patent: 2449949 (1944-09-01), Morris et al.
patent: 3113986 (1963-12-01), Breslow et al.
patent: 3472829 (1969-10-01), Claybaugh et al.
patent: 3475399 (1969-10-01), Peters et al.
patent: 3525729 (1970-08-01), Gaeth
patent: 3541064 (1970-11-01), Yoshimoto et al.
patent: 3580897 (1971-05-01), Yoshimoto et al.
patent: 3720654 (1973-03-01), Olechowski
patent: 3937759 (1976-02-01), Baumgartner et al.
patent: 4014859 (1977-03-01), Cooper et al.
patent: 4156673 (1979-05-01), Eckert
patent: 4340703 (1982-07-01), Freppel
patent: 4501847 (1985-02-01), Kishimoto et al.
patent: 4547555 (1985-10-01), Cook et al.
patent: 4629767 (1986-12-01), Shyr et al.
patent: 4673714 (1987-06-01), Kishimoto et al.
patent: 4980421 (1990-12-01), Teramoto et al.
patent: 5039755 (1991-08-01), Chamberlain et al.
Ziegler-Natta Catalysts and Polymerizations, John Boor, Jr., published by Academic Press in 1979.
Journal of Organo Metallic Chemistry, Feb. 6, 1990, vol. 382, Nos. 1 and 2, pp. 69-76.

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