Catalyst compositions and their use for hydrogenation of nitrile rubber

a technology of nitrile rubber and catalyst composition, which is applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, chemical apparatus and processes, etc., can solve the problem of certain degree of cross-linking, high price of catalyst metal, and high cost of catalyst metal removal/recycle. achieve high hydrogenation activity, high hydrogenation degree, and constant molecular weight of nitrile rubber during hydrogenation
US20150126683A1Inactive Publication Date: 2015-05-07ARLANXEO DEUT GMBH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
ARLANXEO DEUT GMBH
Publication Date
2015-05-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to novel catalyst compositions based on ruthenium or osmium carbene-complex catalysts, pref. of the Grubbs-I, -II or -III type or fluorenylidene analogues thereof, and terminal olefins, pref. enol ethers such as ethyl vinyl ether (EVE or VEE) as co-catalysts and to a process for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions, pref. with a preceding metathesis step using the same complex catalyst as in the hydrogenation step.
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Description

FIELD OF THE INVENTION

[0001] This invention relates to novel catalyst compositions obtainable from reacting Ruthenium- or Osmium-based complex catalysts with specific co-catalysts and to a process for selectively hydrogenating nitrile rubbers in the presence of such novel catalyst compositions.BACKGROUND OF THE INVENTION

[0002] The term “acrylonitrile-butadiene rubber” or “nitrile rubber”, also named as “NBR” for short, shall be interpreted broadly and refers to rubbers which are copolymers or terpolymers of at least one α, β-unsaturated nitrile, at least one conjugated diene and, if desired, one or more further copolymerizable monomers.

[0003] Hydrogenated NBR, also referred to as “HNBR” for short, is produced commercially by hydrogenation of NBR. Accordingly, the selective hydrogenation of the carbon-carbon double bonds in the diene-based polymer must be conducted without affecting the nitrile groups and other functional groups (such as carboxyl groups when other copolymerizable monome...

Claims

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