Process for hydrogenating conjugated diene polymers

Details Process for hydrogenating conjugated diene polymers Process for hydrogenating conjugated diene polymers

1998-07-20

2000-03-21

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

06040390&

ABSTRACT:
This invention relates to a process for hydrogenating selectively the unsaturated double bonds of copolymer having the double bonds of conjugated diene unit, which has been widely used as a modifier of transparent impact-resistant resin or polyolefin, and polystyrene resin. According to this invention, the copolymer is saturated via hydrogenation in the presence of a novel homogeneous system organotitanium catalyst without a separate reducing agent, thus representing an extremely high hydrogenation yield with remarkable hydrogenation reproducibility. Hence, a compound represented by the following formula I is employed as an appropriate catalyst.
Formula I ##STR1## Wherein Cp is a cyclopentadienyl (C.sub.5 H.sub.5) group; R.sub.1, R.sub.2 and R.sub.3 are hydrogen atom or alkyl group of 1 to 3 carbon atoms; and

REFERENCES:
patent: 5039755 (1991-08-01), Chamberlain et al.
patent: 5583185 (1996-12-01), Ferrer et al.
patent: 5817877 (1998-10-01), Hartwig et al.

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