Patent ID: 9593266
Date: 2017-03-14
CPC Classifications: B01F,B29B,B29C,B29D,B29K,B29L,B60C,C08J,C08K,C08L,C09J

Claim:
1. A process of manufacturing a self-sealing elastomer composition that includes a diene elastomer, a hydrocarbon resin with a given softening temperature, and a liquid plasticizing agent, the process comprising, in the listed order, the steps of: incorporating the hydrocarbon resin in the diene elastomer by kneading the hydrocarbon resin and the diene elastomer in a mixer up to a hot compounding temperature greater than the softening temperature of the hydrocarbon resin, wherein the hot compounding temperature is greater than 70° C., in order to obtain a masterbatch; wherein in the step of incorporating the hydrocarbon resin, the diene elastomer is brought into contact with the hydrocarbon resin in a liquid state, and the hydrocarbon resin is iniected in the liquid state into the mixer; incorporating the liquid plasticizing agent in the masterbatch a crosslinking agent for at least 50% by weight of the crosslinking agent, wherein the crosslinking agent is incorporated in the masterbatch by mixing in the mixer or in a different mixer; incorporating the liquid plasticizing agent in the masterbatch by kneading the liquid plasticizing agent and the masterbatch in a mixer or in another mixer, in order to obtain the self-sealing composition; and forming the self-sealing composition as a semi-finished product capable of being used directly in the assembly of a tire blank, wherein the hydrocarbon resin has a Tg of greater than 25° C., a softening point of greater than 50° C., a number-average molar mass (Mn) of between 400 and 2000 g/mol, a polydispersity index (PI) of less than 3 (PI=Mw/Mn with Mw the weight-average molecular weight).