processes for the batch production of rubber - based compositions capable of being shaped and shaped articles made thereof . they include a step of high intensity mixing cured rubber particles with other selected compounds into a closed mixing chamber provided on a high intensity mixer including a central shaft having mixing blades . through high speed rotation of the shaft , blade tip speed above about 20 meter / s are obtained to intensively mix and thermokinetically heat the batch of mixable material , whose temperature is continuously monitored . discharge of the batch from the mixing chamber takes place when the temperature is considered to have reached a reference value ensuring a substantially uniform mix of the rubber material and added compounds , to produce the rubber - based composition . according to a first preferred embodiment , cured rubber is fed into the mixing chamber with a resinous material , and discharge occurs at a temperature ensuring a substantially uniform mix of the rubber material in a matrix of resinous material to produce the rubber - based composition , which can be then shaped without any further heating . according to a second preferred embodiment , a curing agent is added to the cured rubber particles , and the batch is discharged from the mixing chamber when the temperature reaches a reference value ensuring a substantially uniform mix of the cured rubber material with the curing agent without causing a significant further curing , to produce a rubber - based composition capable of being heat - shaped . other preferred embodiments using a reactive polymeric binding agent and a bonding agent are described .