High strength rubber composition

A rubber composition comprising:

• (A1) at least one aromatic compound resulting from the reaction between a reactant of formula (α):
• where B represents CHO or CH2OH, and a reactant of formula (β) or (γ):
• and mixtures thereof, in which Ar represents an optionally substituted aromatic ring, and each R1 and R2 radical represents, independently of one another, a monovalent hydrocarbon radical or a substituted monovalent hydrocarbon radical;
• and
• (A2) at least one phenolic compound chosen from:
• (A21) at least one aromatic polyphenol comprising at least one aromatic ring bearing at least two hydroxyl functional groups in the meta position with respect to one another, the two positions ortho to at least one of the hydroxyl functional groups being unsubstituted;
• (A22) at least one aromatic monophenol comprising at least one six-membered aromatic ring bearing a single hydroxyl functional group, the two positions ortho to the hydroxyl functional group being unsubstituted or at least one position ortho to and the position para to the hydroxyl functional group being unsubstituted;
• and
• mixtures thereof.

A process for the manufacture of a rubber composition in the raw state comprising the step of:

• mixing
• at least one aromatic compound (A1) resulting from the reaction between a reactant of formula (α):
• where B represents CHO or CH2OH, and a reactant of formula (β) or (γ):
• and mixtures thereof, in which Ar represents an optionally substituted aromatic ring, and each R1 and R2 radical represents, independently of one another, a monovalent hydrocarbon radical or a substituted monovalent hydrocarbon radical;
• and
• at least one phenolic compound (A2) chosen from:
• (A21) at least one aromatic polyphenol comprising at least one aromatic ring bearing at least two hydroxyl functional groups in the meta position with respect to one another, the two positions ortho to at least one of the hydroxyl functional groups being unsubstituted;
• (A22) at least one aromatic monophenol comprising at least one six-membered aromatic ring bearing a single hydroxyl functional group, the two positions ortho to the hydroxyl functional group being unsubstituted or at least one position ortho to and the position para to the hydroxyl functional group being unsubstituted;
• and
• mixtures thereof.

A process for the manufacture of a rubber composition in the cured state comprising the steps of:

• manufacturing a rubber composition in the raw state by mixing:
• at least one aromatic compound (A1) resulting from the reaction between a reactant of formula (α)
• where B represents CHO or CH2OH, and a reactant of formula (β) or (γ):
• and mixtures thereof, in which Ar represents an optionally substituted aromatic ring, and each R1 and R2 radical represents, independently of one another, a monovalent hydrocarbon radical or a substituted monovalent hydrocarbon radical;
• and
• at least one phenolic compound (A2) chosen from:
• (A21) at least one aromatic polyphenol comprising at least one aromatic ring bearing at least two hydroxyl functional groups in the meta position with respect to one another, the two positions ortho to at least one of the hydroxyl functional groups being unsubstituted;
• (A22) at least one aromatic monophenol comprising at least one six-membered aromatic ring bearing a single hydroxyl functional group, the two positions ortho to the hydroxyl functional group being unsubstituted or at least one position ortho to and the position para to the hydroxyl functional group being unsubstituted;
• and
• mixtures thereof;
• then shaping the rubber composition in the raw state;
• and
• then crosslinking the rubber composition during which a resin based on the phenolic compound and on the aromatic compound is crosslinked.