Granted Patent B2

US 12,492,300 · App. 17/629,601 · Granted Dec 9, 2025

Inventors: Patricia Lagarde (Clermont-Ferrand, FR); Aline Riou (Clermont-Ferrand, FR)

Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN

C08L7/02B60C1/00C08J3/22C08K3/04C08K3/06C08K3/36C08K5/01C08K5/098B60C2001/0066C08K2201/006

Abstract

Claims (25)

1 . A rubber composition based on:

an elastomeric matrix consisting of one or more diene elastomers each selected from the group consisting of natural rubber, synthetic polyisoprenes, and mixtures thereof;

at least one reinforcing filler predominantly comprising carbon black and at least one reinforcing inorganic filler;

at least one plasticizing resin having a glass transition temperature of greater than or equal to 20° C.;

at least one cobalt salt; and

at least one vulcanization system,

wherein the rubber composition exhibits a Z score for dispersion of the at least one reinforcing filler in the elastomeric matrix of greater than or equal to 85,

wherein the rubber composition is obtained from a masterbatch of the elastomeric matrix and of the carbon black,

wherein the carbon black exhibits a BET specific surface of greater than 60 m 2 /g,

wherein the reinforcing inorganic filler comprises a silica,

wherein a content of the reinforcing inorganic filler is between from 2 to 40 phr,

wherein a content of the plasticizing resin is from 3 to 10 phr, and

wherein a content of the cobalt salt is from 0.1 to 6 phr.

2 . The rubber composition according to claim 1 , wherein the carbon black exhibits a compressed oil absorption number of greater than or equal to 60 ml/100 g.

3 . The rubber composition according to claim 1 , wherein a content of carbon black is within a range extending from 10 to 80 phr.

4 . The rubber composition according to claim 1 , wherein the at least one plasticizing resin is selected from the group consisting of aliphatic resins, aromatic resins, resins of aliphatic/aromatic type, and mixtures thereof.

5 . The rubber composition according to claim 1 , wherein the masterbatch is obtained by liquid-phase compounding starting from a diene elastomer latex and from an aqueous dispersion of carbon black.

6 . The rubber composition according to claim 5 , wherein the masterbatch is obtained by a process comprising:

feeding a continuous stream of the diene elastomer latex to a mixing region of a coagulation reactor defining an elongated coagulation region extending between the mixing region and an outlet;

feeding a continuous stream of the aqueous dispersion of carbon black under pressure to the mixing region of the coagulation reactor in order to form a coagulated mixture; and

drying the coagulated mixture obtained above in order to recover the masterbatch.

7 . A reinforced product comprising at least one steel reinforcing element coated at least in part with a metallic coating and the rubber composition according to claim 1 , the reinforcing element being embedded in the rubber composition.

8 . The reinforced product according to claim 7 , wherein the metal of the metallic coating of the reinforcing element is selected from the group consisting of zinc, copper, tin, cobalt and alloys thereof.

9 . A tire comprising at least one reinforced product according to claim 7 .

10 . A tire comprising at least one rubber composition according to claim 1 .

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (50)