Elastomeric composition exhibiting good dispersion of the filler in the elastomeric matrix
AssigneesMichelin Recherche et Technique S.A., Compagnie Generale Des Etablissements Michelin
InventorsDamien Thomasson, Marc Sevignon
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Abstract
The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler comprising at least carbon black and an inorganic filler with an inorganic filler content of less than or equal to 50 parts by weight per hundred parts of elastomer, characterized in that the composition is obtained from a first masterbatch comprising at least one first diene elastomer and carbon black, and having a dispersion of the carbon black in the elastomeric matrix that has a Z value of greater than or equal to 90, added to which is the inorganic filler and at least one second elastomer, identical to or different from the first elastomer, and also to the process for preparing such a composition.
Claims26
A process for obtaining a composition based on at least one diene elastomer, a reinforcing filler comprising at least carbon black and an inorganic filler with an inorganic filler content of less than or equal to 50 parts by weight per hundred parts of elastomer, which comprises the following steps:
- preparing a first masterbatch comprising the diene elastomer and the carbon black, this first masterbatch having a dispersion of the reinforcing filler in the elastomeric matrix that has a Z value greater than or equal to 90,
- the step of preparing the first masterbatch including forming a coagulated mixture of the diene elastomer and the carbon black, and drying the coagulated mixture in order to recover the first masterbatch,
- incorporating the inorganic filler, the second elastomer and the other constituents of the composition, with the exception of the crosslinking system, into the dried first masterbatch in a mixer, everything being kneaded thermomechanically until a maximum temperature of between 130° C. and 200° C. is reached,
- cooling the combined mixture to a temperature below 100° C.,
- subsequently incorporating:
- the crosslinking system, kneading everything up to a maximum temperature below 120° C.
A process for obtaining a composition based on at least one diene elastomer, a reinforcing filler comprising at least carbon black and an inorganic filler with an inorganic filler content of less than or equal to 50 parts by weight per hundred parts of elastomer, which comprises the following steps:
- preparing a first masterbatch comprising the diene elastomer and the carbon black, this first masterbatch having a dispersion of the reinforcing filler in the elastomeric matrix that has a Z value greater than or equal to 90,
- incorporating the inorganic filler, the second elastomer and the other constituents of the composition, with the exception of the crosslinking system, into the first masterbatch in a mixer, everything being kneaded thermomechanically until a maximum temperature of between 130° C. and 200° C. is reached,
- cooling the combined mixture to a temperature below 100° C.,
- subsequently incorporating:
- the crosslinking system, kneading everything up to a maximum temperature below 120° C.,
- wherein the first masterbatch is produced according to the following successive steps:
- feeding a continuous flow of a diene elastomer latex to a mixing zone of a coagulation reactor defining an elongate coagulation zone extending between the mixing zone and an outlet orifice, feeding a continuous flow of a fluid comprising a filler comprising carbon black under pressure to the mixing zone of a coagulation reactor to form a coagulated mixture, drying the coagulated mixture in order to recover the first masterbatch.
A process for preparing a masterbatch which comprises at least one diene elastomer, a reinforcing filler comprising at least carbon black and an inorganic filler with an inorganic filler content of less than or equal to 50 parts by weight per hundred parts of elastomer, comprising adding to a first diene elastomer and carbon black masterbatch produced according to the following steps:
- feeding a continuous flow of a diene elastomer latex to a mixing zone of a coagulation reactor defining an elongate coagulation zone extending between the mixing zone and an outlet,
- feeding a continuous flow of a fluid comprising a filler comprising carbon black under pressure to the mixing zone of a coagulation reactor to form a coagulated mixture,
- drying the coagulated mixture in order to recover the first masterbatch, the inorganic filler and at least one second elastomer, identical to or different from the first elastomer, by thermomechanical kneading.
Dependencies are inferred from the claim text.