Abstract: The present invention relates to a process for preparing nitrile rubbers having reduced molecular weight by metathesis of a first nitrile rubber in the presence of specific ruthenium complex catalysts that have particular N-heterocyclic carbene ligands.

Abstract: The present invention relates to a process for the production of water and solvent-free hydrogenated nitrile rubber polymers, to the hydrogenated nitrile rubbers and the use thereof.

Abstract: The present invention relates to a process for preparing nitrile rubbers having reduced molecular weight by metathesis of a first nitrile rubber in the presence of specific ruthenium complex catalysts that have particular N-heterocyclic carbene ligands.

Abstract: The present invention relates to functionalized copolymer rubbers containing nitrile groups and to the preparation thereof, to vulcanizable mixtures comprising functionalized copolymer rubbers containing nitrile groups and to the preparation thereof, and to vulcanizates based on functionalized copolymer rubbers containing nitrile groups, to the preparation thereof and to the use thereof as technical material.

Abstract: Catalyst compositions based on Ruthenium- or Osmium-based complex catalysts and specific co-catalysts are provided for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions.

Abstract: This invention relates to novel catalyst compositions based on Ruthenium- or Osmium-based complex catalysts of the Grubbs-Hoveyda, Grela or Zhan type and specific co-catalysts comprising at least one vinyl group, pref. ethyl vinyl ether, and to a process for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions, preferably with a preceding metathesis step using the same complex catalyst as in the hydrogenation step.

Abstract: A copolymer rubber includes, based on a total amount of 100% by weight of all monomer units, ?,?-ethylenically unsaturated nitrile units, conjugated diene units, and ?,?-ethylenically unsaturated monocarboxylic acid monoester units selected from the group consisting of methoxyethyl (meth)acrylates, and polyethylene glycol (meth)acrylates. The rubber has a glass transition temperature lower than ?20° C., an oil swelling of not more than 20 vol %, and provides a balance of good low-temperature stability and oil resistance.

Abstract: This invention relates to novel catalyst compositions based on Ruthenium- or Osmium-based complex catalysts of the Grubbs-Hoveyda, Grela or Zhan type and specific co-catalysts comprising at least one vinyl group, pref. ethyl vinyl ether, and to a process for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions, preferably with a preceding metathesis step using the same complex catalyst as in the hydrogenation step.

Abstract: The present invention is related to a process for the preparation of polymers containing amino groups by hydrogenation of nitrile groups containing polymers by heterogeneous catalysis.

Abstract: Catalyst compositions based on Ruthenium- or Osmium-based complex catalysts and specific co-catalysts are provided for selectively hydrogenating nitrile rubbers in the presence of such catalyst compositions.

Abstract: Provided are new functionalized nitrile rubbers, which may optionally also be in partially or wholly hydrogenated form, and also a process for preparing them by metathesis of nitrile rubbers in the presence of a metathesis catalyst and at least one functionalized allyl compound. The new functionalized nitrile rubbers are suitable for producing vulcanizable mixtures and allow the production of vulcanizates having very stable networks. Also made possible, in particular, is the synthesis of block copolymers.

Abstract: Provided are new functionalized nitrile rubbers, which may optionally also be in partially or wholly hydrogenated form, and also a process for preparing them by metathesis of nitrile rubbers in the presence of a metathesis catalyst and at least one functionalized allyl compound. The new functionalized nitrile rubbers are suitable for producing vulcanizable mixtures and allow the production of vulcanizates having very stable networks. Also made possible, in particular, is the synthesis of block copolymers.

Abstract: The present invention is related to a process for the preparation of polymers containing amino groups by hydrogenation of nitrile groups containing polymers by heterogeneous catalysis.

Abstract: A process of degrading nitrile rubbers comprises subjecting them to a metathesis reaction in the presence of specific catalysts with increased activity.

Abstract: Novel phenol-containing nitrile rubbers having a specific phenol content are provided, as are a process for production thereof, vulcanizable mixtures based thereon and vulcanizes thus obtained. The vulcanizes feature particularly good storage stability, moduli and elongation at break.

Abstract: Novel hydrogenated nitrile rubbers having a specific phenol content are provided, as are a process for production thereof, vulcanizable mixtures based thereon and vulcanizates thus obtained. The vulcanizates feature particularly good moduli and compression set values, and very good storage stabilities.

Abstract: Novel hydrogenated nitrile rubbers are provided, which, as well as having reduced contents of phosphines and/or diphosphines, include phosphine oxides and a specific content of halogens, and which enable access to vulcanizable mixtures and corresponding vulcanizates that possess improved moduli and compression set values and good values for heat buildup under dynamic stress. These novel hydrogenated nitrile rubbers are obtained by a specific production process, in the course of which the hydrogenated nitrile rubbers are reacted with at least one specific oxidizing agent.

Abstract: The invention relates to novel hydrogenated nitrile rubbers containing phosphine sulphides and/or diphosphate sulphides, to a process for production thereof, vulcanizable mixtures based on the hydrogenated nitrile rubbers, and to vulcanizates obtained in that way. The hydrogenated nitrile rubbers feature a very good profile of properties, especially with regard to the stress values at different elongations and the compression set after storage at high temperatures.

Abstract: Novel hydrogenated nitrile rubbers having a specific phenol content are provided, as are a process for production thereof, vulcanizable mixtures based thereon and vulcanizates thus obtained. The vulcanizates feature particularly good moduli and compression set values.

Abstract: Novel hydrogenated nitrile rubbers are provided, which include phosphine oxides and/or diphosphine oxides and a specific content of halogens, and which enable access to vulcanizable mixtures and corresponding vulcanizates that possess improved moduli and compression set values. These novel hydrogen nitrile rubbers are obtained by a production process, in which the hydrogenated nitrile rubbers are reacted with at least one specific sulphur compound.