Production of hydrogenated nitrile rubbers
AssigneeBayer Aktiengesellschaft
InventorsHartmuth Buding, Heinrich Konigshofen, Zsolt Szentivanyi, Joachim Thormer
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Abstract
The hydrogenation of NBR in an aromatic solvent with tris-(triphenylphosphane)-rhodium-(I) halide as catalyst under hydrogen pressures of from 20 to 350 bars and at temperatures in the range from 100.degree. to 145.degree. C. leads to products having degrees of hydrogenation of at least 90% and outstanding properties when the catalyst concentration amounts to between 0.05 and 0.6% by weight, based on solid rubber, and when hydrogenation is carried out in the presence of at most 2% by weight of triphenylphosphane.
Claims8
Process for the production of hydrogenated nitrile rubbers by hydrogenating statistical binary copolymers of from 85 to 52% by weight of butadiene and from 15 to 48% by weight of acrylonitrile in solution in an aromatic solvent and catalyzed with at most 2% by weight of triphenylphosphane and from 0.05 to 0.6% by weight of tris-(triphenylphosphane)-rhodium-(I) halide, based in each case on solid rubber, at temperatures of from 100.degree. to 145.degree. C. and under hydrogen pressures of from 20 to 350 bars, whereby at least 90% of the CC-double bonds are hydrogenated.
Dependencies are inferred from the claim text.