Patent ID: 7799872

Claim:
A process for selectively hydrogenating carbon-carbon double bonds in a diene-based polymer comprising subjecting the diene-based polymer which is present in latex form to a hydrogenation which is performed in the absence of any organic solvent and by contacting it with a catalytically active system based on a first main catalyst component having the general formula (I) MQ x .a H 2 O (I) wherein M is a group VIII transition noble metal, Q is identical or different, and a hydride or an anion other than a hydride, x is 1, 2, or 3, and a is in the range of from 0 to 3 and on a secondary water-insoluble catalyst component having either the general formula (II) or the general formula (III) R 1 m B (II) R 2 2 C-A-CR 2 2 (III) in which R 1 is identical or different and represents hydrogen, alkyl, aryl, cycloalkyl, or aralkyl, B is phosphorus, nitrogen, arsenic, sulfur, or a sulphoxide group S═O, and m is 2 or 3, R 2 is identical or different and represents hydrogen, alkyl, aryl, cycloalkyl, or aralkyl, C is phosphorus, or arsenic, A represents either a single bond or a spacer group wherein such catalytically active system is prepared in-situ.