Patent ID: 7875683
Filing Date: 2011-01-25
Classification: C08C,C08L

Abstract:
1. A process for reducing the molecular weight of nitrile rubber comprising bringing a nitrile rubber into contact with a metathesis catalyst which is a complex catalyst based on a metal of transition group 6 or 8 of the Periodic Table and which has at least one ligand bound in a carbene-like fashion to the metal and also a compound of the general formula (I) where M is a transition metal of transition group 4, 5 or 6 of the Period Table of the Elements, m is 4, 5 or 6 and the radicals Z are identical or different and are each a linear, branched, aliphatic, cyclic, heterocyclic or aromatic radical which has 1-32 carbon atoms and may additionally have from 1 to 15 heteroatoms.