Partially hydrogenated nitrile rubbers
AssigneeLANXESS Deutschland GmbH
InventorsWerner Obrecht, Julia Maria Müller, Oskar Nuyken, Martin Schneider
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Abstract
Provided are new partially hydrogenated nitrile rubbers which are distinguished by a specific ratio of viscosity to molecular weight, and also vulcanizable mixtures and vulcanizates based on said rubbers, and also the associated preparation processes. The partially hydrogenated nitrile rubbers lead to compounded formulations having advantageous processing properties in conjunction with excellent vulcanizate properties.
Claims18
A partially hydrogenated nitrile rubber comprising:
- a degree of hydrogenation of 50% to 97%, and
- a ratio of solution viscosity (SV) to weight average of the molecular weight (Mw) of 4*10−3 to 30*10−3 Pa*s mol/kg.
A process for preparing partially hydrogenated nitrile rubbers having a degree of hydrogenation of 50% to 97%, and a ratio of solution viscosity (SV) to weight average of the molecular weight (Mw) of 4*10−3 to 30*10−3 Pa*s*mol/kg, the process comprising subjecting partially hydrogenated nitrile rubbers having degrees of hydrogenation of 50% to 97% to a metathesis reaction in the presence of a complex catalyst based on a metal from transition group 6 or 8 of the Periodic Table and comprising at least one ligand attached carbenically to the metal, wherein the metathesis takes place substantially free from C2-C16 olefins.
A vulcanizable mixture comprising:
- (i) at least one partially hydrogenated nitrile rubber having a degree of hydrogenation of 50% to 97%, and a ratio of solution viscosity (SV) to weight average of the molecular weight (Mw) of 4*10−3 to 30*10−3 Pa*s*mol/kg, and
- (ii) at least one peroxidic crosslinking system.
Dependencies are inferred from the claim text.