Process for manufacturing a self-sealing composition

A process for manufacturing a self-sealing elastomer composition, wherein said process comprises the steps of:

• a) firstly a masterbatch comprising at least one diene elastomer and a hydrocarbon resin with a content greater than 30 phr is manufactured by compounding these various components in a mixer at a temperature or up to a temperature called the “hot compounding temperature” which is above the softening point of the hydrocarbon resin;
• and
• b) then at least one crosslinking system is incorporated into the masterbatch thus prepared, by compounding everything, in the same mixer or in a different mixer, at a temperature or up to maximum temperature which is kept below 100° C., in order to obtain said self-sealing composition, and wherein at least one liquid plasticizer having a glass transition temperature (Tg) below −20° C. is furthermore incorporated in an amount of 5 to 40 phr into said masterbatch or into said composition, wherein the liquid plasticizer is chosen from the group of liquid elastomers, polyolefinic oils, naphthenic oils, paraffinic oils, DAE oils, MES oils, TDAE oils, mineral oils, vegetable oils, ester plasticizers, phosphate plasticizers and mixtures of these compounds, and wherein the number-average molecular weight of the liquid plasticizer is between 300 and 90,000 g/mol.