Selective hydrogenation method of living polymer having olefinic

Details Selective hydrogenation method of living polymer having olefinic Selective hydrogenation method of living polymer having olefinic

1997-12-26

1999-11-30

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...

5253928, 5253329, 5253331, 5253332, C08F 804

Patent

active

059944773

ABSTRACT:
There is provided a method for selectively hydrogenating a living polymer having olefinic double bonds. A monomer having at least one conjugated double bond, optionally together with an olefinic monomer, is polymerized in the presence of an alkyllithium polymerization initiator, to give a living polymer. This olefinic living polymer is reacted with a hydrocarbon compound, to give a deactivated living polymer and a hydrocarbon lithium compound. The double bonds within the conjugated dien units of the polymer are selectively hydrogenated in the presence of a monocyclopentadienyltitanium compound which is under the influence of the hydrocarbon lithium compound. The hydrocarbon, which acts as a deactivator of the living polymer, terminates the anion polymerization occurring due to an activated anion of the living polymer and thus, prevents the intermolecular cross-linking of the polymers so that the gelation of the polymers does not occur. In addition, the hydrocarbon lithium serves as a reducing agent for the hydrogenating catalyst, monocyclopentadienyltitanium compound, so that a high selectivity and hydrogenation efficiency can be obtained without accurate adjustment of Li/Ti mole ratio.

REFERENCES:
patent: 5753778 (1998-05-01), Ko et al.

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