A process for producing a hydrogenation product of a ring-containing unsaturated hydrocarbon polymer, which product is low in the content of the heterogeneous catalyst used. A ring-containing unsaturated hydrocarbon polymer is subjected to a hydrogenation reaction under hydrogen pressure in the…

Disclosed are a precursor composition, a rubber component and a shear ply prepared from the precursor composition, and methods for making and using the same. The precursor composition includes: (a) a first hydrogenated nitrile conjugated-diene copolymer modified by a metal salt unsaturated…