Process for the manufacture of a crosslinkable composition

A moderator composition for use in a process for the preparation of a RMA crosslinkable composition comprising at least one crosslinkable component comprising reactive components A and B each comprising at least 2 reactive groups wherein the at least 2 reactive groups of component A are acidic protons C—H in activated methylene or methine groups and the at least 2 reactive groups of component B are activated unsaturated groups C═C and base catalyst C,

• said moderator composition comprising one or more N—H group containing reactivity moderating components D that are also a Michael addition donor reactable with component B under the action of catalyst C, having a melting temperature above 60° C., dissolved in one or more RMA crosslinkable polymer components comprising reactive components A or B, and comprising less than 300 gr/ltr of an organic solvent,
• said moderator composition being obtained by a process wherein the RMA crosslinkable polymer component comprising reactive component A or B or both is synthesized at a temperature above the melting temperature of component D and component D is added directly after the synthesis of said polymer and dissolved therein before cooling to a temperature below the melting temperature of the component D.