composição vulcanizável, processo para a produção de uma composição vulcanizável, processo para a produção de vulcanizados com base em uma borracha de nitrila hidrogenada, vulcanizado obtenível, pelo processo e borracha de nitrila hidrogenada

Vulcanizable composition comprises: (i) at least one epoxy group-containing, optionally completely or partially hydrogenated nitrile rubber, which comprises repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one additional copolymerizable monomer, but no non-conjugated cyclic polyene; and (ii) at least one Lewis and/or Bronsted acid as crosslinking agent, where the crosslinking agent is present in the vulcanizable composition only in a amount less of than 2.5 parts by weight. Vulcanizable composition comprises: (i) at least one epoxy group-containing, optionally completely or partially hydrogenated nitrile rubber, which comprises repeating units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one additional copolymerizable monomer, but no non-conjugated cyclic polyene; and (ii) at least one Lewis and/or Bronsted acid as crosslinking agent, where the crosslinking agent is present in the vulcanizable composition only in a amount less of than 2.5 parts by weight, based on 100 parts by weight of the epoxy groups-containing, optionally completely or partially hydrogenated nitrile rubber (i). Independent claims are also included for: (1) preparing the vulcanizable composition comprising, mixing at least one epoxy group-containing, completely or partially hydrogenated nitrile rubber (i) with at least one Lewis and/or Bronsted acid (ii); (2) preparing the vulcanizates based on the epoxy group-containing, optionally completely or partially hydrogenated nitrile rubber, comprising crosslinking the vulcanizable composition by increasing the temperature, preferably 20-250[deg] C, preferably 50-230[deg] C; (3) the vulcanizates obtained by the above mentioned method; and (4) the epoxy group-containing, completely or partially hydrogenated nitrile rubbers comprising repeat units derived from at least one conjugated diene, at least one alpha , beta -unsaturated nitrile and optionally at least one other copolymerizable monomers, without non-conjugated cyclic polyene.