Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
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.
REFERENCES:
patent: 4076914 (1978-02-01), Moczygemba et al.
patent: 4076915 (1978-02-01), Trepka
patent: 4501857 (1985-02-01), Kishimoto et al.
patent: 4656230 (1987-04-01), Shyr et al.
patent: 4673714 (1987-06-01), Kishimoto et al.
patent: 4994508 (1991-02-01), Shiraki et al.
patent: 5017660 (1991-05-01), Hattori et al.
patent: 5039755 (1991-08-01), Chamberlain et al.
Chamberlain Linda Rae
Gibler Carma J.
Haas Donald F.
Lipman Bernard
Shell Oil Company
LandOfFree
Selective hydrogenation of conjugated diolefin poylmers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Selective hydrogenation of conjugated diolefin poylmers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selective hydrogenation of conjugated diolefin poylmers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-975836