Patent ID: 7846995
Filing Date: 2010-12-07
Classification: C08C,C08L

Abstract:
1. A process for the removal of ruthenium-containing catalyst residues from optionally hydrogenated nitrile rubber comprising the treatment of a solution of an optionally hydrogenated nitrile rubber containing ruthenium-containing catalyst residues with a functionalized ion exchange resin, characterized in that such functionalized ion exchange resin is (i) macroreticular, (ii) modified with at least one type of functional group which is selected from a primary amine, secondary amine, thiol, carbodithioate, thiourea and a dithiocarbamate group and (iii) has an average particle diameter in the range of from 0.2 to 2.5 mm dry basis and wherein the resin comprises styrene-divinylbenzene copolymers.