Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements

Compagnie Generale Des Etablissements Michelin

Societe Detechnologie Michelin

Sylvie Gandon-Pain

Arnaud Lapra

Franck Varagniat

Alain Hut

Laure Belin

Geraldine Laffargue

Nanoparticles of functionalized, cross-linked vinyl polymer, usable as reinforcing filler in a polymeric matrix. The vinyl polymer is a copolymer of at least the following monomers, which are all copolymerizable by free-radical polymerization: a non-aromatic vinyl monomer 'A'; a monomer 'B' bearing a function Z of formula &#x2261;Si&#x2014;X, where X represents a hydroxyl or hydrolysable group; and a cross-linking monomer &#x201c;C&#x201d; which is at least bifunctional from the point of view of the polymerization. The vinyl polymer is preferably a polymethacrylate, in particular a copolymer of methyl methacrylate (monomer A), trimethoxysilylpropyl methacrylate (monomer B) and ethylene glycol dimethacrylate (monomer C), being in the form of nanobeads the diameter of which is of between 10 and 100 nm.

Functionalized vinyl polymer nanoparticles

Branched block polymers, and the rubber compositions containing them, which can be used, in particular, for manufacturing tires or semi-finished products for tires. Processes for preparing said polymers and compositions are also disclosed.

Rubber composition containing branched blocked polymers

Rubber composition based on at least one diene elastomer, a polymer filler as reinforcing filler, a coupling agent providing the bond between the polymer filler and the elastomer. The polymer filler comprises nanoparticles of non-aromatic vinnyl polymer ('NAVP') bearing a function Z of formula &#x2261;Si&#x2014;X, X representing a hydroxyl or hydrolysable group. The NAVP is in particular a copolymer of methyl methacrylate, trimethoxysilylpropyl methacrylate and ethylene glycol dimethacrylate, in the form of nanobeads the diameter of which is between 10 and 100 nm.

Elastomeric composition reinforced with a funtionalized non-aromatic vinyl polymer filler

Rubber composition based on at least one diene elastomer, a polymeric filler as reinforcing filler and a coupling agent for bonding between the polymeric filler and the elastomer. The polymeric filler includes nanoparticles of a polyvinylaromatic (PVAr) carrying a functional group denoted by Z of formula a &#x2261;Si&#x2014;X, X representing a hydroxyl or hydrolyzable group. The PVAr is especially a copolymer of styrene, ethylvinylbenzene, divinylbenzene and trimethoxysilylpropylacrylate or trimethoxysilylpropylmethacrylate, being in the form of nanobeads, the diameter of which is betweenandnm. Also described is a method of obtaining such a composition, and use of such a rubber composition for the manufacture of rubber articles, in particular tires or rubber semi-finished products intended for these tires, as well as a masterbatch including at least one diene elastomer and such a polymeric filler, and a method of obtaining such a masterbatch.

Elastomeric composition reinforced with a functionalized polyvinylaromatic filler

Rubber composition, which can be used for the manufacture of tires, based on at least one diene elastomer, one reinforcing filler, one vulcanization system and, as antireversion agent, one itaconimidomaleimide compound of formula (R hydrocarbon radical):  Use of such a composition for the manufacture of a finished article or of a semi-finished product made of rubber intended for a motor vehicle ground-contact system, in particular of a tire.

Rubber composition comprising an itaconimidomaleimide

A process for obtaining a grafted diene elastomer having functional groups along the chain, a rubber composition containing this grafted elastomer and having in particular improved hysteresis properties in the cross-linked state, a preparation process for this composition, a tire tread made from this composition and a tire of reduced rolling resistance which incorporates this tread. A process for obtaining this grafted elastomer includes a radical grafting reaction carried out in solution or without a solvent by means of a reagent of the mercaptan type to graft functional groups on to the chain of a starting elastomer. The starting elastomer is treated with an antioxidant having at least one aromatic amine function before the grafting reaction, so that the grafted elastomer has a macrostructure which is practically identical to that of the starting elastomer. A rubber composition containing the grafted diene elastomer includes a reinforcing inorganic filler, and the grafted elastomer preferably has a molar ratio of units originating from conjugated dienes greater than 30%.

Process for obtaining a grafted elastomer having functional groups along the chain and a rubber composition

A process is described for obtaining from an 'FCC' initial C5 fraction which is enriched with isoprene and purified and usable for the selective polymerization of isoprene. A process is also described for obtaining an isoprene homopolymer from a polymerization medium comprising isoprene and at least one methyl butene, such as said 'FCC' C5 fraction which is enriched with isoprene and purified. The process of obtaining the final fraction from the initial C5 fraction includes: a catalytic hydrogenation reaction of said initial C5 fraction by a palladium-based catalyst, which produces an intermediate C5 fraction comprising n-pentenes in a mass ratio which is less than 0.1 % and methyl butenes, a dehydrogenation reaction applied to the intermediate C5 fraction, which includes methyl butenes to produce the final fraction, and purification of the final fraction to obtain a purified fraction which is practically devoid of disubstituted alkynes, true alkynes and cyclopentadiene, and the mass fraction of the methyl butenes in the intermediate fraction is &#x3c;30 %. The process for obtaining an isoprene homopolymer includes the step of reacting, in the presence of isoprene and at least one methyl butene, a catalytic system based on a conjugated diene, a rare earth salt of an organic phosphoric acid in suspension, an alkylating agent, and a halogen donor, and the mass fraction of the methyl butenes in the intermediate fraction is &#x3c;30 %. The process for obtaining an isoprene homopolymer includes the step of reacting, in the presence of isoprene and at least one methyl butene, a catalytic system based on a conjugated diene, a rare earth salt of an organic phosphoric acid in suspension, an alkylating agent, and a halogen donor.

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Clermont-Ferrand, France

Sylvie Gandon-Pain