Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L7/00—Compositions of natural rubber
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
  • B60C1/0016—Compositions of the tread
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L21/00—Compositions of unspecified rubbers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
  • C08L9/06—Copolymers with styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F212/02—Monomers containing only one unsaturated aliphatic radical
  • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F212/06—Hydrocarbons
  • C08F212/08—Styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
  • C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
  • C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
  • C08F236/06—Butadiene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes

Definitions

• the present invention relates to tire treads having inorganic filler-reinforced rubber compositions.
• a tire tread must, as is known, obey a large number of technical, often antithetical, requirements including low rolling resistance, high wear resistance, and high adhesion on dry roads. as wet.
• thermoplastic elastomers TPE
• the use of such elastomers makes it possible in particular to improve certain properties of use of the tire, in particular the performance of adhesion, rolling resistance and resistance to abrasion.
• the object of the present invention is to provide a tire mix which makes it possible to maintain the adhesion gain conferred by the use of inorganic filler, while improving the adhesion on dry ground, since the improvement of the adhesion properties of the tires remains a constant concern for tire designers.
• the object of the present invention is achieved in that the inventors have found a specific rubber composition, based on an elastomeric matrix comprising at least one diene elastomer and a polar TPE copolymer, and a reinforcing filler comprising a reinforcing inorganic filler. , which makes it possible to obtain treads of tires having a compromise of the adhesion properties on wet ground and on dry ground Significantly improved.
• the inventors have shown that the use of polar thermoplastic elastomers in such a rubber composition also makes it possible to respond to the problem related to improving the compromise of properties in the uncrosslinked / crosslinked states of said composition.
• a first object of the invention is a rubber composition for tread tire based on
• the subject of the invention is also the use of this rubber composition for the manufacture of tires or semi-finished products for tires, in particular of tire treads, which are intended for the manufacture of new tires as well as for the manufacture of new tires. retreading of used tires.
• the invention also relates to a tread comprising a rubber composition according to the invention.
• composition-based is meant a composition comprising the mixture and / or the reaction product of the various constituents used, some of these basic constituents being capable of or intended to react with one another, less in part, during the various phases of manufacture of the composition, in particular during its crosslinking or vulcanization.
• any range of values designated by the expression "between a and b" represents the range of values from more than a to less than b (i.e. terminals a and b excluded) while any range of values designated by the term “from a to b” means the range from a to b (i.e., including the strict limits a and b).
• "phr” means parts by weight per hundred parts of total elastomer, therefore including the polar TPE copolymer.
• a first object of the invention is a rubber composition based on
• the elastomeric matrix comprises at least one diene elastomer in proportions ranging from 60 phr to 95 phr. Below the minimum indicated, the grip performance on dry ground tend to decrease significantly, while above the maximum recommended, wet grip performance are degraded.
• the elastomer matrix comprises between 70 and 90 phr of at least one diene elastomer.
• elastomer of the "diene” type, it is recalled here that it is to be understood in known manner an elastomer derived at least in part (ie, a homopolymer or a copolymer) from monomers dienes (monomers carrying two carbon-carbon double bonds, conjugated or not).
• diene elastomer it should be understood according to the invention any synthetic elastomer derived at least in part from monomers dienes. More particularly, diene elastomer is any homopolymer obtained by polymerization of a conjugated diene monomer having 4 to 12 carbon atoms, or any copolymer obtained by copolymerization of one or more conjugated dienes with one another or with one or more vinylaromatic compounds. having from 8 to 20 carbon atoms. In the case of copolymers, these contain from 20% to 99% by weight of diene units, and from 1 to 80% by weight of vinylaromatic units.
• Conjugated dienes which can be used in the process according to the invention are especially suitable for 1,3-butadiene, 2-methyl-1,3-butadiene and 2,3-di (C 1 -C 5 alkyl) -1,3 butadiene such as, for example, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 3-isopropyl-1,3-butadiene, phenyl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene, etc.
• Suitable vinylaromatic compounds are styrene, ortho-, meta, para-methylstyrene, the commercial "vinyltoluene" mixture, para-tert-butylstyrene, methoxystyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene and the like.
• Suitable polybutadienes and in particular those having a content (mol%) in units -1.2 of between 4% and 80% or those having a content (mol%) of cis-1,4 greater than 80% polyisoprenes, copolymers of butadiene-styrene and in particular those having a Tg (glass transition temperature, measured according to ASTM D3418) of between 0 ° C.
• styrene content between 5% and 60%> by weight and more particularly between 20%> and 50%>, a content (mol%) in 1,2-bonds of the butadiene part of between 4% and 75%, a content (mol%) of trans-1,4 bonds of between 10% and 80%, butadiene-isoprene copolymers and in particular those of having an isoprene content of between 5% and 90% by weight and a Tg of -40 ° C to -80 ° C, the isoprene-styrene copolymers and in particular those having a styrene content of between 5% and 50% by weight.
• butadiene-styrene-isoprene copolymers are especially suitable those having a styrene content of between 5% and 50% by weight and more particularly between 10% and 40%), an isoprene content of between 15% and 60% by weight and more particularly between 20% and 50%, a butadiene content between 5% and 50% by weight and more particularly between 20% and 40%, a content (mol%) in units - 1, 2 of the butadiene part of between 4% and 85%, a content (mol%) in trans-1,4 units of the butadiene part of between 6% and 80%, a content (mol%) in units -1, 2 more -3,4 of the isoprenic part of between 5% and 70% and a content (mol%) in trans-1,4 units of the isoprenic part of between 10% and 50%, and more generally any butadiene-styrene copolymer; isoprene with a
• the diene elastomer of the composition according to the invention is preferably chosen from the group of diene elastomers consisting of polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures of these elastomers.
• Such copolymers are more preferably selected from the group consisting of styrene copolymers (SBR, SIR and SBIR), polybutadienes (BR) and natural rubber (NR).
• the elastomer matrix comprises a diene elastomer chosen from those described above.
• the elastomer matrix comprises at least two diene elastomers.
• one of the two elastomers is preferably a styrene copolymer, for example an SBR, a SBIR, a SIR or their mixtures, in proportions of between 60% and 100% by weight. of the total weight of diene elastomer, the other being chosen from polybutadienes and natural rubber in proportions of between 0% and 40% by weight of the total weight of diene elastomer.
• one of the two elastomers is preferably natural rubber in proportions of between 70% and 100% by weight of the total weight of diene elastomer, the other elastomer being preferably a copolymer of styrene, for example an SBR, a SBIR, a SIR or their mixtures, in proportions of between 0% and 30% by weight of the total weight of diene elastomer.
• the elastomer matrix comprises, as a second component, a polar thermoplastic elastomer TPE in proportions ranging from 5 phr to 40 phr. Below the minimum indicated, wet grip performance tends to decrease significantly, while above the recommended maximum, dry grip performance is degraded.
• the elastomer matrix comprises from 5 phr to 30 phr, more preferably from 10 phr to 25 phr of a polar TPE thermoplastic elastomer.
• thermoplastic thermoplastic TPE elastomer is a copolymer comprising an elastomeric block (noted B for reasons of simplification) and at least one thermoplastic block, the latter being polar (noted M for reasons of simplification). It is essentially in the form of a diblock copolymer or a triblock copolymer.
• the thermoplastic thermoplastic TPE elastomer according to the present invention may also consist of a mixture of these copolymers.
• the elastomer block B is advantageously a diene elastomer as defined above. It is preferably a polybutadiene or a copolymer of styrene such as an SBR for example.
• the elastomeric block B preferably has a weight average molecular weight (Mw) of 5,000 to 65,000 g / mol.
• the polar thermoplastic block M can be either a homopolymer obtained by polymerization of at least one monomer chosen from short chain alkylacrylic acid esters (from 1 to 4 carbon atoms), the alkyl radical preferably comprising 1 to 4 atoms. of carbon, a copolymer obtained by copolymerization of one or more of these monomers with one another or with one or more monomers, acrylic or non-acrylic. If the polar thermoplastic block M is a copolymer, it preferably contains at least 70% by weight of alkylacrylate unit.
• the alkylacrylic acid ester monomer is a short chain methacrylic acid ester, more preferably still selected from methyl methacrylate, ethyl methacrylate.
• the polar thermoplastic block M is a polymer of polymethylmethacrylate (PMMA) or polyethylmethacrylate (PEMA) type.
• the polar thermoplastic block M preferably has a weight average molecular weight (Mw) of 35,000 to 70,000 g / mol.
• the thermoplastic thermoplastic TPE elastomer may comprise a third block, which is a thermoplastic block (noted S for reasons of simplification), different from the polar thermoplastic block M.
• this thermoplastic block is either a homopolymer obtained by polymerization of at least one vinylaromatic monomer, ie a copolymer obtained by copolymerization of one or more of these vinylaromatic monomers with one another or with one or more other monomers.
• vinylaromatic monomers are especially suitable styrene, ortho-, meta, para-methylstyrene, the commercial mixture "vinyltoluene", para-tert-butylstyrene, methoxystyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene, etc.
• the monomer is styrene.
• the thermoplastic block S is a polystyrene.
• the thermoplastic block S preferably has a weight average molecular weight (Mw) of 14,000 to 55,000 g / mol.
• the polar TPE thermoplastic elastomer preferably has a weight average molecular weight (Mw) of 40,000 to 190,000 g / mol.
• thermoplastic thermoplastic elastomer TPE advantageously has the following composition expressed as a weight fraction:
• the elastomer block B represents from 20% to 60%, preferably from 30% to 50%,
• the polar thermoplastic block M represents from 21% to 42%, preferably from 30% to 42%, on 100% of polar TPE thermoplastic elastomer.
• thermoplastic block S represents from 13% to 52%, preferably from 13% to 20%, over 100% of polar TPE thermoplastic elastomer.
• thermoplastic thermoplastic TPE elastomer is a polystyrene-polybutadiene-polyethylmethacrylate copolymer or a polystyrene-polybutadiene-polymethylmethacrylate copolymer, the latter being particularly preferred.
• elastomeric matrix may also comprise, in combination with the previously described components, another thermoplastic elastomer.
• the rubber composition, object of the invention comprises as essential second component, a reinforcing filler comprising an inorganic filler.
• the inorganic filler is the majority load of the reinforcing filler and preferably represents a weight fraction equal to or greater than 50% of this reinforcing filler, and particularly a weight fraction of between 50% and 100%, or even up to 100%.
• any inorganic or mineral filler regardless of its color and origin (natural or synthetic), also called “white” charge, “clear” charge or “non-black filler”, as opposed to carbon black, capable of reinforcing on its own, without any other means than an intermediate coupling agent, a rubber composition intended for the manufacture of tires, in other words capable of replacing, in its reinforcing function, a conventional carbon black of pneumatic grade; such a filler is generally characterized, in known manner, by the presence of hydroxyl groups (-OH) on its surface.
• -OH hydroxyl groups
• the reinforcing inorganic filler is, wholly or at least predominantly, silica (SiO 2).
• the silica used may be any reinforcing silica known to those skilled in the art, in particular any precipitated or fumed silica having a BET surface and a CTAB specific surface area both less than 450 m 2 / g, even if the highly dispersible precipitated silicas are preferred.
• As reinforcing inorganic filler mention may also be made of mineral fillers of the aluminous type, in particular alumina (Al 2 O 3) or aluminum (oxide) hydroxides, or reinforcing titanium oxides.
• reinforcing inorganic filler is present indifferent, whether in the form of powder, microbeads, granules or beads.
• reinforcing inorganic filler is also understood to mean mixtures of different reinforcing inorganic fillers, in particular of highly dispersible silicas as described above.
• the reinforcing filler may contain, in addition to the abovementioned reinforcing inorganic filler (s), an organic filler, such as carbon black.
• This reinforcing organic filler is then preferably present in a weight fraction of less than 50% relative to the total weight of the filler.
• Suitable carbon blacks are all carbon blacks conventionally used in tire rubber compositions (so-called pneumatic grade blacks). Carbon blacks could for example already be incorporated into natural rubber in the form of a masterbatch.
• black / silica or partially or fully silica-coated blacks are suitable for forming the reinforcing filler.
• Blacks are also suitable silica-modified carbon such as, without limitation, the charges which are sold by CABOT under the name "CRX 2000", and which are described in international patent document WO-A-96/37547.
• organic fillers other than carbon blacks mention may be made of the organic functionalized polyvinylaromatic fillers as described in the applications WO-A-2006/069792 and WO-A-2006/069793, or else the organic fillers of polyvinyl non-aromatic functionalized as described in applications WO-A-2008/003434 and WO-A-2008/003435.
• the weight fraction of this carbon black in said reinforcing filler is more preferably chosen less than or equal to 30% relative to the total weight of the reinforcing filler.
• the rubber composition according to the invention comprises, as another component, a coupling agent for coupling the reinforcing inorganic filler to the elastomers that make up the elastomeric matrix.
• coupling agent is more specifically meant an agent capable of establishing a sufficient chemical and / or physical bond between the charge in question and the elastomer, while facilitating the dispersion of this charge within the elastomeric matrix.
• any coupling agent known for, or capable of effectively ensuring, in the rubber compositions which can be used for the manufacture of tires, the coupling between a reinforcing inorganic filler such as silica and a diene elastomer, such as, for example, organosilanes, may be used.
• a reinforcing inorganic filler such as silica
• a diene elastomer such as, for example, organosilanes
• organosilanes such as, for example, organosilanes
• polysulfurized alkoxysilanes or mercaptosilanes or alternatively polyorganosiloxanes carrying functional groups capable of binding physically and / or chemically to the inorganic filler and of functions capable of binding physically and / or chemically to the elastomer, for example by means of intermediate of a sulfur atom.
• Silica / elastomer bonding agents in particular, have been described in a large number of documents, the best known of which are bifunctional alkoxysilanes such as polysulfurized alkoxysilanes.
• polysulfide silanes called “symmetrical” or “asymmetrical” silanes according to their particular structure, are used, as described for example in the applications WO03 / 002648 (or US 2005/016651) and WO03 / 002649 (or US 2005/016650).
• coupling agent other than polysulfurized alkoxysilane mention may be made in particular of bifunctional POSS (polyorganosiloxanes) or polysulfides of hydroxysilane as described in patent applications WO 02/30939 (or US Pat. No. 6,774,255) and WO 02 / 31041 (or US 2004/051210), or else silanes or POSS carrying azo functional groups. dicarbonyl, as described for example in patent applications WO 2006/125532, WO 2006/125533, WO 2006/125534.
• the level of coupling agent is advantageously less than 20 phr, it being understood that it is generally desirable to use as little as possible. Its level is preferably between 0.5 and 12 phr, more preferably from 3 to 10 phr, in particular from 4 to 7 phr. This level is easily adjusted by those skilled in the art according to the level of inorganic filler used in the composition. Those skilled in the art will understand that, as the equivalent filler of the reinforcing inorganic filler described in this paragraph, it would be possible to use a reinforcing filler of another nature, in particular an organic filler, since this reinforcing filler would be covered with a filler. inorganic layer such as silica, or would comprise on its surface functional sites, especially hydroxyl, requiring the use of a coupling agent to establish the bond between the filler and the elastomer.
• the rubber compositions in accordance with the invention may also contain, in addition to the coupling agents, coupling activators, inorganic charge-covering agents or, more generally, processing aid agents which may be used in a known manner, by improving the dispersion of the filler in the rubber matrix and lowering the viscosity of the compositions, to improve their ability to implement in the green state, these agents being for example hydrolysable silanes such as alkylalkoxysilanes, polyols, polyethers, primary, secondary or tertiary amines, hydroxylated or hydrolysable polyorganosiloxanes.
• these agents being for example hydrolysable silanes such as alkylalkoxysilanes, polyols, polyethers, primary, secondary or tertiary amines, hydroxylated or hydrolysable polyorganosiloxanes.
• the rubber compositions in accordance with the invention may also comprise all or part of the usual additives normally used in elastomer compositions intended for the manufacture of tires, for example pigments, protective agents such as anti-ozone waxes, chemical antioxidants, anti-oxidants, anti-fatigue agents, reinforcing or plasticizing resins, acceptors (for example phenolic novolak resin) or methylene donors (for example HMT or H3M) as described, for example, in the application WO 02/10269, a crosslinking system based on either sulfur, or sulfur and / or peroxide donors and / or bismaleimides, vulcanization accelerators, vulcanization activators, adhesion promoters such as compounds based on cobalt, plasticizing agents, preferably non-aromatic or very weakly aromatic selected from the group consisting of hu naphthenic, paraffinic, MES oils, TDAE oils, ethers plasticizers, ester plasticizers (for example glycerol trioleate),
• the invention also relates to a method for preparing a rubber composition as described above.
• the composition is manufactured in appropriate mixers, using two successive preparation phases well known to those skilled in the art: a first phase of work or thermomechanical mixing (so-called “non-productive” phase) at high temperature, up to a maximum of maximum temperature between 110 ° C and 190 ° C, preferably between 130 ° C and 180 ° C, followed by a second phase of mechanical work (so-called “productive” phase) to a lower temperature, typically less than 110 ° C, for example between 40 ° C and 100 ° C, finishing phase during which is incorporated the crosslinking system.
• the process according to the invention for preparing a rubber composition according to the invention comprises at least the following steps:
• thermomechanical working time (sometimes referred to as a "non-productive" phase) of the constituents of of the rubber composition, with the exception of the crosslinking system, by intimately incorporating, by kneading into one or more steps, the elastomeric matrix based on natural rubber, of the ingredients of the composition, and the production, at a temperature below said maximum temperature of said first time, preferably below 120 ° C, of a second mechanical working time during which said crosslinking system is incorporated and, if appropriate, an adhesion promoter,
• the final composition thus obtained can then be calendered, for example in the form of a sheet, a plate or extruded, for example to form a rubber profile and as a semi-finished rubber product for the tire.
• the invention also relates to a tire which incorporates in at least one of its constituent elements a reinforced rubber composition according to the invention.
• the invention particularly relates to a semi-finished rubber product comprising a reinforced rubber composition according to the invention for these tires.
• a reinforced rubber composition according to the invention for these tires.
• a tire whose tread comprises the composition has a grip on wet soil and improved dry soil. This improvement in grip performance is confirmed by the results of the road tests.
• a tread comprising a rubber composition according to the invention constitutes a particularly advantageous implementation of the invention and constitutes an object of the invention.
• the rubber compositions are characterized, before and after firing, as indicated below.
• the Mooney plasticity measurement is carried out according to the following principle: the raw composition (i.e., before firing) is molded in a cylindrical chamber heated to 100 ° C. After one minute of preheating, the rotor rotates within the test tube at 2 revolutions / minute and the useful torque is measured to maintain this movement after 4 minutes of rotation.
• the Shore A hardness of the compositions after firing is assessed according to ASTM D 2240-86.
• Dynamic properties are measured on a viscoanalyzer (Metravib VA4000) according to ASTM D 5992-96.
• the response of a sample of vulcanized composition (cylindrical specimen 4 mm in thickness and 400 mm 2 in section) is recorded, subjected to a sinusoidal stress in alternating simple shear, at the frequency of 10 Hz, during a sweeping in temperature, under a fixed stress of 0.7 MPa, the value of tan ⁇ observed at 0 ° C (ie tan ( ⁇ ) 0 ° c) is recorded and the value of tan ⁇ observed at 20 ° C (ie tan ( (b) 20 ° c).
• tan ( ⁇ ) 0 ° c is representative of the adhesion potential on wet ground: the higher the tan ( ⁇ ) 0 ° c, the better adhesion.
• tan ( ⁇ ) 20 ° C is representative of the adhesion potential on dry ground: the higher tan ( ⁇ ) 20 ° c is, the better the adhesion.
• the tires are mounted on a Renault and Mégane 1.6 RTE model equipped with an ABS braking system and the distance required to go from 80 km / h to 10 km / h is measured during a sudden braking on ground watered (bituminous concrete).
• the tires are mounted on a Renault and Mégane 1.6 RTE model equipped with an ABS braking system and the distance needed to go from 100 Km / h to 0 Km / h during a sudden braking on dry ground (bituminous concrete).
• the mixture thus obtained is recovered, cooled, and sulfur and a sulfenamide type accelerator are incorporated on a mixer (homo-finisher) at 50 ° C., mixing the whole (productive phase) for a suitable time (for example between 5 hours). and 12 min).
• compositions thus obtained are then calendered either in the form of plates (thickness of 2 to 3 mm) or thin sheets of rubber for the measurement of their physical or mechanical properties, or extruded in the form of a tread.
• Plasticizer A Oleic sunflower oil
• Plasticizer B polylimonene resin THER9872 sold under the name Dercolyte L120 by the company DRT
• the hysteretic potential at 20 ° C (temperature sweep at 0.7 MPa) of the three compositions B, C and D, objects of the invention is higher without the hysteretic potential at 0 ° C bends.
• Compositions A and C were used to form the tread of tires PA and PC tested under the conditions described above.

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