Hydrogenation of nitrile group-containing unsaturated polymers
AssigneeBayer Aktiengesellschaft
InventorsHartmuth Buding, Paul Fiedler, Heinrich Konigshofen, Joachim Thormer
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Abstract
Nitrile group-containing polymers are hydrogenated in a homogeneous phase with preservation of the nitrile groups in a low molecular weight ketone as a solvent and with a compound corresponding to formula RuX[(L.sub.1)(L.sub.2).sub.n ] as a catalyst, wherein X represents hydrogen, halogen L.sub.1 represents hydrogen, halogen, optionally substituted cyclopentadienyl, L.sub.2 represents a phosphane, bisphosphane or arsane and n is 1, 2 or 3 and [(L.sub.1)(L.sub.2).sub.n ] represents a cyclopentadienyl bisphosphane.
Claims5
In a process for the hydrogenation of at least 80% of olefinic bonds contained in an unsaturated copolymer derived from:
- 85 to 50%, by weight, conjugated diene,
- 15 to 50%, by weight, unsaturated nitrile,
- 0 to 10%, by weight, of a monomer copolymerizable with the conjugated diene and the unsaturated nitrile,
- with preservation of the nitrile groups, the improvement comprising, hydrogenating in the presence of a low molecular weight ketone solvent with a catalyst of the formula
- RuX[(L.sub.1)(L.sub.2).sub.n ]
- wherein X is hydrogen or halogen,
- L.sub.1 is hydrogen, halogen, cyclopentadienyl, or methyl, ethyl or phenyl substituted cyclopentadienyl,
- L.sub.2 is a phosphane, bisphosphane or arsane,
- n is 1, 2 or 3,
- or [(L.sub.1)(L.sub.2).sub.n ] is a cyclopentadienyl-bisphosphane,
- where the concentration of the catalyst, calculated as Ruthenium and based on the unsaturated polymer, is from 10 to 1000 ppm and the concentration of the unsaturated copolymer, based on the total solution, is from 1 to 99% by weight.
Dependencies are inferred from the claim text.