Vulcanization-activating composition, method for producing same and use thereof

A method for preparing a vulcanization-activating composition [hereinafter, composition (A)], said method comprising at least one mixing step:

• at least 5% by weight and at most 95% by weight, preferably at least 5% by weight and at most 75% by weight, of particles of an oxygenated zinc compound [hereinafter compound (OZ)];
• and
• of at least 1% by weight and at most 75% by weight of at least one vegetable oil or of at least one vegetable oil derivative, thus forming the composition (A), the percent by weight being based on the total weight of said composition (A),
• wherein said vegetable oil or vegetable oil derivative comprises, based on the total weight of said vegetable oil or vegetable oil derivative:
• at least 8% by weight of at least one fatty acid residue;
• said fatty acid residue comprising at least two unsaturations.