Enamines as vulcanization accelerators for natural or synthetic rubbers

A method for accelerating the vulcanization of a rubber composition, comprising combining a natural or synthetic rubber with an effective amount of a vulcanization accelerator, wherein said vulcanization accelerator is at least one compound selected from the group consisting of compounds belonging to the group of enamines having formula (I):

• wherein:
• R1 and R2, considered jointly with the nitrogen atom, represent a C3-C8 heterocyclic group, optionally containing a heteroatom selected from the group consisting of oxygen, nitrogen and sulfur;
• and R3 represents a C1-C18 alkyl group, linear or branched;
• a C6-C18 aryl group;
• a C7-C20 alkylaryl or arylalkyl group;
• or a C1-C8 alkoxyl group linear or branched.