Hutchinson

Patrice Woisel

Benoit Le Rossignol

Laina Guo

Marie Dubaa

The invention relates to a rubber composition for a mechanical member with a dynamic function, to a process for preparing this composition, to such a member and to a use of a polymer bearing urethane functions. The composition is based on at least one elastomer and comprises a reinforcing filler and said polymer dispersed in the elastomer, the composition comprising the product of an in situ thermomechanical blending reaction of the elastomer with the filler, precursors of the polymer and a chain extender. According to the invention, the composition has a ratio G' 0.5%/G′ 20% of storage moduli G′ relative to the complex shear moduli G* satisfying at least one of the following conditions (i) to (v), G′ 0.5% and G′ 20% being measured according to the standard ISO 4664 at respective dynamic strain amplitudes of 0.5% and 20%, on double shear test specimens subjected to shear strains of from 0.02% to 50% at the same frequency of 5 Hz and at the same temperature T:0.5%/20%≤1.15 for=100° C.,  (i)0.5%/20%≤1.40 for=65° C.,  (ii)0.5%/20%≤1.50 for=25° C.,  (iii)0.5%/20%≤1.60 for=0° C.,  (iv)0.5%/20%≤2.50 for30° C.  (v)

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BAILLEUL, France

Patrice Woisel