WO2015091922A1 - Pneumatique pour vehicules destines a porter de lourdes charges - Google Patents
Pneumatique pour vehicules destines a porter de lourdes charges Download PDFInfo
- Publication number
- WO2015091922A1 WO2015091922A1 PCT/EP2014/078685 EP2014078685W WO2015091922A1 WO 2015091922 A1 WO2015091922 A1 WO 2015091922A1 EP 2014078685 W EP2014078685 W EP 2014078685W WO 2015091922 A1 WO2015091922 A1 WO 2015091922A1
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- WIPO (PCT)
- Prior art keywords
- tire according
- tire
- saturated
- thermoplastic elastomer
- elastomer
- Prior art date
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Classifications
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- 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
- 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
- C08L53/025—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 modified
Definitions
- the field of the present invention is that of tires for vehicles intended to carry heavy loads, in particular buses, trucks, agricultural vehicles, civil engineering vehicles.
- treads which have, in relation to the tread thicknesses of the tires for light vehicles, in particular for passenger cars or vans, large thicknesses of rubber material.
- the wearing part of the tread of a truck has a thickness of at least 15 mm, that of a civil engineering vehicle at least 30 mm, or up to 120 mm.
- a tread undergoes mechanical stresses and aggression resulting from direct contact with the ground.
- the mechanical stresses and the aggressions suffered by the tire are amplified under the effect of the weight carried by the tire. This has the consequence that the crack initiators which are created in the tread under the effect of these stresses and these attacks, tend to spread more on the surface or inside the tread.
- the crack propagation resistance of a tread of a tire for a civil engineering vehicle, an agricultural vehicle or a heavy-duty construction vehicle is crucial to minimizing the impact of tread damage.
- a first object of the invention is a tire for vehicles intended to carry heavy loads whose tread comprises a composition based on at least:
- an elastomeric matrix comprising a polyisoprene and a saturated styrenic thermoplastic elastomer comprising at least one styrenic rigid segment and at least one hydrogenated diene flexible segment,
- the polyisoprene representing more than 50% of the difference between the mass of the elastomer matrix and the mass of the saturated thermoplastic elastomer
- the saturated styrenic thermoplastic elastomer representing at most 50% by weight of the elastomer matrix.
- the invention also relates to a method for manufacturing the tire according to the invention.
- the cracking rate was measured on specimens of rubber compositions, using a 381 type "Elastomer Test System" of the MTS company, as explained hereinafter.
- the tensile test piece consists of a parallelepiped-shaped rubber plate, for example of thickness between 1 and 2 mm, of length between 130 and 170 mm and of width between 10 and 15 mm, the two lateral edges being each lengthwise covered with a cylindrical rubber bead (diameter 5 mm) allowing anchoring in the jaws of the traction machine.
- the test pieces thus prepared are tested in the new state. The test was conducted in air at a temperature of 20 ° C.
- the crack propagation rate is measured in nanometers per cycle. Resistance to crack propagation will be expressed in relative units (u.r.) by dividing the speed of propagation of the control by that of the mixture, the speeds being measured at the same rate of energy release. A value greater than that of the control, arbitrarily set at 100, indicates an improved result, that is, a higher resistance to crack propagation.
- composition-based in the present description a composition comprising the mixture and / or the reaction product in situ of the various constituents used, some of these basic constituents (for example the elastomer, the filler or other additive conventionally used in a rubber composition intended for the manufacture of tire) being capable of, or intended to react with one another, at least in part, during the different phases of manufacture of the composition intended for the manufacture of a tire .
- the elastomeric matrix of the rubber composition has the essential feature of comprising a polyisoprene.
- the polyisoprene may be an elastomer of any microstructure.
- the polyisoprene comprises a 1,4-cis bond mass ratio of at least 90% of the mass of the polyisoprene.
- polyisoprene having this preferred microstructure are suitable natural rubber, a synthetic polyisoprene or their mixture.
- polyisoprene represents more than 50% of the difference between the mass of the elastomer matrix and the mass of the saturated styrenic thermoplastic elastomer, which means that polyisoprene has a weight fraction greater than 50% relative to the total mass of the non-thermoplastic elastomers of the elastomer matrix.
- elastomeric matrix is suitable for example a mixture consisting of 40% by weight of a saturated thermoplastic styrene elastomer, 45% by weight of a natural rubber and 15% by weight of a SB, the percentages being calculated on the basis of of the total mass of the elastomeric matrix.
- the polyisoprene represents more than 50% by weight of the elastomer matrix.
- a mixture consisting of 40% by weight of a saturated styrenic thermoplastic elastomer, 55% by weight of a natural rubber and 5% by weight of an SBR, is used. percentages being calculated on the basis of the total mass of the elastomeric matrix.
- the elastomer matrix contains no other elastomers than polyisoprene and saturated thermoplastic styrene elastomer, which means that only the polyisoprene and the saturated styrenic thermoplastic elastomer constitute the matrix. elastomer.
- the polyisoprene and the saturated styrenic thermoplastic elastomer are not the only components of the elastomer matrix.
- the elastomer matrix may contain a second diene elastomer.
- second diene elastomer is meant one or more diene elastomers other than polyisoprene.
- iene elastomer or indistinctly rubber
- one or more elastomers consisting at least in part (Le., A homopolymer or a copolymer) of monomeric diene units (monomers carrying two double bonds) must be understood in known manner. carbon-carbon, conjugated or not).
- diene elastomers can be classified into two categories: “essentially unsaturated” or “essentially saturated”.
- the term “essentially unsaturated” is generally understood to mean a diene elastomer derived at least in part from conjugated diene monomers, having a level of units or units of diene origin (conjugated dienes) which is greater than 15% (mol%);
- diene elastomers such as butyl rubbers or copolymers of dienes and alpha-olefins of the EPDM type do not fall within the above definition and may in particular be described as "essentially saturated” diene elastomers ( low or very low diene origin, always less than 15%).
- the term “highly unsaturated” diene elastomer is particularly understood to mean a diene elastomer having a content of units of diene origin (conjugated dienes) which is greater than 50%.
- the term “diene elastomer” can be understood more particularly to be used in the compositions according to the invention:
- diene elastomer any type of diene elastomer
- the person skilled in the tire art will understand that the present invention is preferably implemented with essentially unsaturated diene elastomers, in particular of the type (a) or (b). ) above.
- copolymers of type (b) these contain from 20 to 99% by weight of diene units and from 1 to 80% by weight of vinylaromatic units.
- conjugated dienes 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-di (C 1 -C 5 alkyl) -1,3-butadienes, such as, for example, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-methyl-3-isopropyl-1 3-butadiene, aryl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene.
- 2,3-dimethyl-1,3-butadiene 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-methyl-3-isopropyl-1 3-butadiene
- aryl-1,3-butadiene 1,3-pentadiene, 2,4-hexadiene.
- Suitable vinylaromatic compounds are, for example, styrene, ortho-, meta-, para-methylstyrene, the "vinyl-toluene" commercial mixture, para-tert-butylstyrene, methoxystyrenes, chlorostyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene.
- the second diene elastomer is a substantially unsaturated elastomer selected from the group consisting of polybutadienes, butadiene copolymers, isoprene copolymers, and mixtures of these elastomers.
- diene elastomer is particularly suitable polybutadiene (B), a copolymer of butadiene and styrene (SB).
- the saturated styrenic thermoplastic elastomer comprises at least one styrenic rigid segment and at least one hydrogenated diene flexible segment.
- the rigid and flexible segments can be arranged linearly, star or connected.
- a flexible segment refers to an elastomeric type polymer block
- a rigid segment refers to a thermoplastic type polymer block.
- the saturated thermoplastic styrene elastomer may be a diblock. The diblock then consists of a rigid styrenic segment and a hydrogenated flexible diene segment.
- the saturated styrenic thermoplastic elastomer comprises at least two rigid styrenic segments.
- generally at least two chain ends of the saturated styrenic thermoplastic elastomer are each provided with a styrenic rigid segment and the rigid styrenic segments are connected by the hydrogenated diene flexible segment (s).
- the saturated styrenic thermoplastic elastomer is preferably a triblock. The triblock then consists of two rigid styrenic segments and a hydrogenated flexible diene segment.
- the denomination of "the at least one rigid segment” designates the rigid segment present in the saturated styrenic thermoplastic elastomer.
- the name "the at least one rigid segment” designates the rigid segments present in the saturated styrenic thermoplastic elastomer.
- the denomination of "the at least one flexible segment” designates the flexible segment present in the saturated styrenic thermoplastic elastomer.
- the denomination of "the at least one flexible segment” designates the flexible segments present in the saturated styrenic thermoplastic elastomer.
- the at least one styrenic rigid segment is the homopolymer of a styrenic monomer or the block or random copolymer of several styrenic monomers or the copolymer of one or more styrenic monomers and another non-styrenic monomer such as 1,3-diene.
- styrene monomer is to be understood in the present description styrene or substituted styrene.
- substituted styrenes which may be mentioned are methylstyrenes (for example ⁇ -methylstyrene, m-methylstyrene or p-methylstyrene, alpha-methylstyrene, alpha-2-dimethylstyrene, alpha-4-dimethylstyrene or diphenylethylene), para-tert-butylstyrene, chlorostyrenes (e.g., ⁇ -chlorostyrene, m-chlorostyrene, p-chlorostyrene, 2,4-dichlorostyrene, 2,6-dichlorostyrene or 2,4,6-dichlorostyrene).
- methylstyrenes for example ⁇ -methylstyrene, m-methylstyrene or p-methyls
- the at least one styrenic rigid segment has a glass transition temperature greater than 80 ° C.
- the at least one styrenic rigid segment is polystyrene.
- the at least one hydrogenated diene flexible segment consists at least in part of conjugated diene monomer units (also called conjugated diene units), which conjugated diene units are hydrogenated.
- conjugated diene monomer units also called conjugated diene units
- conjugated diene units are hydrogenated.
- it may equivalently use a styrenic thermoplastic elastomer whose double bonds of the conjugated diene units of the diene soft segment will have been reduced in a single bond by a process other than hydrogenation.
- reductions with an aluminum hydride or with diimine, for example.
- the at least one hydrogenated diene flexible segment may be the homopolymer of a conjugated diene or the random or block copolymer of several conjugated dienes or the copolymer of one or more conjugated dienes and at least one other non-diene monomer such as a styrenic monomer, which homopolymer or copolymer has its conjugated diene units hydrogenated.
- conjugated diene units 1,3-butadiene units and isoprene units are particularly suitable.
- the at least one hydrogenated diene flexible segment may be the product of total hydrogenation of a polybutadiene, a polyisoprene or a copolymer of 1,3-butadiene and isoprene.
- the copolymer of 1,3-butadiene and isoprene may be of a block or random nature.
- Suitable saturated thermoplastic elastomers are diblock copolymers such as styrene / ethylene / butylene (SEB), styrene / ethylene / propylene (SEP), styrene / ethylene / ethylene / propylene (SEEP) block copolymers, or mixtures of these copolymers.
- SEB styrene / ethylene / butylene
- SEP styrene / ethylene / propylene
- SEEP styrene / ethylene / ethylene / propylene
- Suitable saturated thermoplastic elastomers are triblock copolymers such as styrene / ethylene / butylene / styrene (SEBS), styrene / ethylene / propylene / styrene (SEPS), styrene / ethylene / ethylene / propylene / styrene (SEEPS) block copolymers or mixtures of these copolymers.
- SEBS styrene / ethylene / butylene / styrene
- SEPS styrene / ethylene / propylene / styrene
- SEEPS styrene / ethylene / ethylene / propylene / styrene
- saturated thermoplastic elastomer are also suitable mixtures of a triblock copolymer mentioned above and a diblock copolymer mentioned above.
- the triblock copolymer can contain a minor weight fraction of a diblock copolymer consisting of a rigid styrenic segment and a hydrogenated flexible diene segment, the rigid block and the flexible block being respectively of the same chemical nature, in particular of the same microstructure as the rigid and flexible blocks of the saturated thermoplastic elastomer.
- the presence of diblock copolymer in the triblock copolymer generally results from the synthesis process of the triblock copolymer which can lead to the formation of a secondary product such as the diblock copolymer.
- diblock copolymer in the triblock copolymer does not exceed 40% by weight of triblock copolymer.
- the presence of diblock copolymer in the triblock is also found in the triblock after hydrogenation of the conjugated diene units of the triblock, the diblock copolymer also having its conjugated diene units hydrogenated.
- the mass ratio of the at least one styrenic rigid segment is between 5 and 40% of the mass of the saturated styrenic thermoplastic elastomer.
- the thermoplastic character of the saturated styrenic thermoplastic elastomer is likely to decrease significantly while above the maximum recommended, the elasticity of the composition can be affected.
- the mass ratio of the at least one styrenic rigid segment in the saturated styrenic thermoplastic elastomer is preferably in a range from 10 to 35%, more preferably from 10 to 20% of the mass of the elastomer. saturated styrenic thermoplastic.
- the number-average molar mass (denoted Mn) of the saturated styrenic thermoplastic elastomer is preferably between 50,000 and 500,000 g / mol, more preferably between 60,000 and 450,000 g / mol, more preferably between 80,000 and and 300,000 g / mol.
- Mn number-average molar mass
- the molar mass is determined in a known manner by steric exclusion chromatography (SEC).
- SEC steric exclusion chromatography
- the sample is first solubilized in tetrahydrofuran at a concentration of about 1 g / l; then the solution is filtered on 0.45 ⁇ porosity filter before injection.
- the apparatus used is a chromatographic chain "WATE S alliance”.
- the elution solvent is tetrahydrofuran, the flow rate 0.7 ml / min, the system temperature 35 ° C and the analysis time 90 min.
- a set of four WATERS columns in series, of trade names "STYRAGEL"("HMW7","HMW6E" and two "HT6E" is used.
- the injected volume of the solution of the polymer sample is 100 ⁇ .
- the detector is a differential refractometer "WATERS 2410" and its associated chromatographic data exploitation software is the system "WATE S MILLENNIUM”.
- the calculated average molecular weights relate to a calibration curve made with polystyrene standards.
- the saturated styrenic thermoplastic elastomer is present in a mass proportion of at most 50% of the mass of the elastomer matrix of the rubber composition of the tread. Above the indicated maximum value, there is no more benefit on the crack propagation resistance of the rubber composition forming the tread of a tire intended to carry heavy loads.
- the content of the saturated styrenic thermoplastic elastomer varies within a range of preferably from 5 to 50%, more preferably from 10 to 45%, even more preferably from 20 to 45% by weight of the mass of the elastomer matrix.
- it varies from 25 to 45% by weight of the mass of the elastomer matrix.
- the saturated styrenic thermoplastic elastomer is a mixture of saturated styrenic thermoplastic elastomers according to the invention
- the rates indicated apply to the mixture and not to each of the saturated thermoplastic elastomers. These rates, whether preferential or not, apply to any of the embodiments of the invention.
- the reinforcing filler may be any type of so-called reinforcing filler, known for its ability to reinforce a rubber composition that can be used for the manufacture of tires, for example an organic filler such as carbon black, a reinforcing inorganic filler such as silica which is associated in a known manner a coupling agent, or a mixture of these two types of charges.
- an organic filler such as carbon black
- a reinforcing inorganic filler such as silica which is associated in a known manner a coupling agent, or a mixture of these two types of charges.
- Such a reinforcing filler typically consists of nanoparticles whose average size (in mass) is less than one micrometer, generally less than 500 nm, most often between 20 and 200 nm, in particular and more preferably between 20 and 150 nm.
- the reinforcing filler may comprise a carbon black.
- the carbon black has a BET specific surface area of at least 90 m 2 / g.
- blacks conventionally used in tires or their treads are suitable.
- the carbon black has a BET surface area of at least 100 m 2 / g.
- the carbon blacks can be used in the isolated state, as commercially available, or in any other form, for example as support for some of the rubber additives used.
- the carbon blacks could for example already be incorporated into an isoprene elastomer in the form of a masterbatch (see for example WO 97/36724 or WO 99/16600).
- the BET surface area of the carbon blacks is measured according to the D6556-10 standard [multipoint method (at least 5 points) - gas: nitrogen - relative pressure range ⁇ / ⁇ 0: 0.1 to 0.3].
- the reinforcing filler may comprise a reinforcing inorganic filler.
- "Reinforcing inorganic filler” means any inorganic or mineral filler, irrespective of its color and origin (natural or synthetic), also called “white” filler, "clear” filler or even “non-black” filler.
- a rubber composition intended for the manufacture of pneumatic tires in other words able to replace, in its function reinforcement, 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.
- Suitable reinforcing inorganic fillers are in particular mineral fillers of the siliceous type, preferentially 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 specific surface and a CTAB specific surface area both less than 450 m 2 / g, preferably from 30 to 400 m 2 / g, in particular between 60 and 300 m 2 / g.
- Silica "Ultrasil VN3" sold by the company Evonik can be cited as an example of silica that is useful for the purposes of the invention.
- HDS highly dispersible precipitated silicas
- reinforcing inorganic filler also refers to mixtures of different reinforcing inorganic fillers, in particular of highly dispersible silicas as described above.
- the BET surface area is determined in a known manner by gas adsorption using the Brunauer-Emmett-Teller method described. in "The Journal of the American Chemical Society” Vol. 60, page 309, February 1938, specifically according to the French standard NF ISO 9277 of December 1996 (multipoint volumetric method (5 points) - gas: nitrogen - degassing: time at 160 ° C - relative pressure range p / po: 0.05 at 0.17).
- the CTAB specific surface is the external surface determined according to the French standard NF T 45-007 of November 1987 (method B).
- a coupling agent is used in a well-known manner, in particular an at least bifunctional silane (or bonding agent) intended to ensure a sufficient connection, of a chemical and / or physical nature.
- an at least bifunctional silane or bonding agent
- organosilanes or at least bifunctional polyorganosiloxanes are used.
- 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).
- polysulphide silanes having the general formula (V) are not suitable for limiting the definition below.
- x is an integer of 2 to 8 (preferably 2 to 5);
- the symbols A which are identical or different, represent a divalent hydrocarbon group (preferably an alkylene Ci-Ci 8 or an arylene group C 6 -C 2, more particularly alkylene Ci-Ci 0, in particular -C C 4 , especially propylene);
- the radicals one, substituted or unsubstituted, identical or different represent an alkyl group Ci-8 cycloalkyl, C 5 -C 8 aryl or C 6 -C 8 (preferably alkyl, -C C 6 , cyclohexyl or phenyl, especially C 1 -C 4 alkyl groups, more particularly methyl and / or ethyl).
- the radicals R 2 substituted or unsubstituted, identical or different, represent an alkoxy group or Ci-Ci 8 cycloalkoxy, C 5 -C 8 (preferably a group selected from alkoxyls and C 8 cycloalkoxyls C 5 -C 8 , more preferably still a group selected from C 1 -C 4 alkoxyls, in particular methoxyl and ethoxyl).
- silane polysulfides are more particularly the bis (mono, trisulfide or tetrasulfide) of bis (alkoxyl (Ci-C 4) alkyl (Ci-C 4) silyl-alkyl (C 4 -C )), such as polysulfides of bis (3-trimethoxysilylpropyl) or bis (3-triethoxysilylpropyl).
- TESPT bis (3-triethoxysilylpropyl) tetrasulfide
- TESPD bis (triethoxysilylpropyl) disulfide
- the content of coupling agent is advantageously less than 20 phr, it being understood that it is generally desirable to use as little as possible.
- the level of coupling agent is from 0.5% to 15% by weight relative to the amount of inorganic filler. Its level is preferably between 0.5 and 12 phr, more preferably in a range from 3 to 10 phr. This level is easily adjusted by those skilled in the art according to the level of inorganic filler used in the composition.
- the rubber composition 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 can 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 (especially alkyltriethoxysilanes), polyols, polyethers (for example polyethylene glycols), primary, secondary or tertiary amines (for example trialkanolamines), hydroxylated or hydrolyzable POSs, for example ⁇ , ⁇ -dihydroxy polyorganosiloxanes (in particular ⁇ , ⁇ -dihydroxy-polydimethylsiloxanes) and fatty acids, for example stearic acid.
- hydrolysable silanes such as alkylalkoxy
- the carbon black represents more than 50% by weight of the reinforcing filler of the rubber composition. Carbon black is then considered as the majority reinforcing filler.
- the silica may be used at levels ranging from 2 phr to 35 phr, preferably from 3 to 25 phr, and in particular from 5 to 20 phr.
- the rubber composition contains from 0 to less than 2 phr of a coupling agent, more preferably from 0 to less than 1 phr of a coupling agent, even more preferably it does not contain a coupling agent.
- the silica is not considered as a reinforcing filler and the rubber composition preferably contains a coating agent which is preferably a polyethylene glycol.
- a coating agent which is preferably a polyethylene glycol.
- the reinforcing inorganic filler preferably a silica
- the reinforcing inorganic filler represents more than 50% by weight of the reinforcing filler of the rubber composition. It is then considered that the reinforcing inorganic filler is the majority reinforcing filler.
- the carbon black is preferably used at a level of less than 20 phr, more preferably less than 10 phr (for example between 0.5 and 20 phr, especially between 2 and 10 phr). In the ranges indicated, it benefits from the coloring properties (black pigmentation agent) and anti-UV carbon blacks, without otherwise penalizing the typical performance provided by the reinforcing inorganic filler.
- the level of reinforcing filler is preferably comprised in a range from 10 to 90 phr. Below 10 phr, the reinforcement of the rubber composition may be insufficient to provide an adequate level of cohesion or wear resistance of the rubber component of the tire comprising this composition. Beyond 90 phr, there is a risk of increasing the hysteresis of the rubber composition and therefore a risk of heating of the tread and the tire.
- the level of reinforcing filler is more preferably 25 phr to 70 phr, more preferably 35 to 60 phr.
- the rubber composition may also comprise all or part of the usual additives normally used in elastomer compositions, for example plasticizers, pigments, protective agents such as anti-ozone waxes, chemical antiozonants, antioxidants, anti-fatigue agents, a crosslinking system, accelerators or retarders of vulcanization, vulcanization activators.
- the crosslinking system is preferably based on sulfur, but it may also be based on sulfur donors, peroxide, bismaleimides or their mixtures.
- the rubber composition can be manufactured in suitable 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 at a maximum temperature of between 130 ° C. and 200 ° C., followed by a second mechanical working phase (so-called “productive” phase) to a lower temperature, typically less than 110 ° C., for example between 40 ° C. ° C and 100 ° C, finishing phase during which is incorporated the crosslinking system.
- a first phase of work or thermomechanical mixing at high temperature, up to at a maximum temperature of between 130 ° C. and 200 ° C.
- a second mechanical working phase typically less than 110 ° C., for example between 40 ° C. ° C and 100 ° C, finishing phase during which is incorporated the crosslinking system.
- the method for preparing the tire according to the invention comprises for example the following steps:
- thermomechanically kneading in the course of a first so-called non-productive step with polyisoprene, adding the saturated styrenic thermoplastic elastomer, the reinforcing filler, optionally the coupling agent, by thermomechanically kneading until reaching a maximum temperature of between 130 and 200; ° C,
- the tire for vehicles intended to carry heavy loads according to the invention is preferably a tire off the road, pneumatic for vehicles rolling on non-bituminous soils such as vehicles civil engineering, construction heavy-duty vehicles, or agricultural vehicles.
- the tire is preferably a tire for a civil engineering vehicle regardless of the embodiment of the invention.
- compositions T, A, B, C, D and E are prepared in accordance with the process described above.
- the compositions A to E are in accordance with the invention in that the elastomer matrix comprises natural rubber and at most 50% by weight of a saturated styrenic thermoplastic elastomer according to the invention. They differ from each other in the rate and nature of the saturated styrenic thermoplastic elastomer.
- the composition T is a control composition whose elastomer matrix contains 100% natural rubber.
- compositions thus obtained are then calendered, either in the form of plates (with a thickness ranging from 2 to 3 mm) or thin rubber sheets, for the measurement of their physical or mechanical properties, or in the form of directly usable profiles, after cutting and / or assembly to the desired dimensions, as a tire tread.
- composition A to E make it possible to significantly improve the service life of tires carrying heavy loads, such as tires fitted to heavy goods vehicles, in particular agricultural vehicles, civil engineering vehicles and vehicles. construction heavy trucks, since these tires become much less sensitive to crack propagation at their tread.
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Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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BR112016014436A BR112016014436A2 (pt) | 2013-12-20 | 2014-12-19 | pneumático para veículos destinados a levar cargas pesadas |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1363139 | 2013-12-20 | ||
FR1363139A FR3015492A1 (fr) | 2013-12-20 | 2013-12-20 | Pneumatique pour vehicules destines a porter de lourdes charges |
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WO2015091922A1 true WO2015091922A1 (fr) | 2015-06-25 |
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PCT/EP2014/078685 WO2015091922A1 (fr) | 2013-12-20 | 2014-12-19 | Pneumatique pour vehicules destines a porter de lourdes charges |
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BR (1) | BR112016014436A2 (fr) |
FR (1) | FR3015492A1 (fr) |
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Cited By (4)
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WO2016202970A1 (fr) * | 2015-06-18 | 2016-12-22 | Compagnie Generale Des Etablissements Michelin | Pneumatique pour vehicules destines a porter de lourdes charges |
WO2017103387A1 (fr) * | 2015-12-18 | 2017-06-22 | Compagnie Generale Des Etablissements Michelin | Pneumatique pourvu d'une bande de roulement comprenant un elastomere dienique, un elastomere thermoplastique et un peroxyde |
CN108586849A (zh) * | 2018-04-28 | 2018-09-28 | 平潭诚信智创科技有限公司 | 一种用于汽车轮胎的复合橡胶组合物及其制备方法 |
WO2023202915A1 (fr) * | 2022-04-21 | 2023-10-26 | Compagnie Generale Des Etablissements Michelin | Matrice élastomère comprenant un élastomère thermoplastique |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3056595A1 (fr) * | 2016-09-29 | 2018-03-30 | Compagnie Generale Des Etablissements Michelin | Bande de roulement pour pneumatique comportant un elastomere thermoplastique |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2952644A1 (fr) * | 2009-11-17 | 2011-05-20 | Michelin Soc Tech | Pneumatique dont la bande de roulement comporte un elastomere thermoplastique |
FR2954333A1 (fr) * | 2009-12-23 | 2011-06-24 | Michelin Soc Tech | Pneumatique dont la zone sommet est pourvue d'une sous-couche comportant un elastomere thermoplastique |
-
2013
- 2013-12-20 FR FR1363139A patent/FR3015492A1/fr not_active Withdrawn
-
2014
- 2014-12-19 BR BR112016014436A patent/BR112016014436A2/pt not_active IP Right Cessation
- 2014-12-19 WO PCT/EP2014/078685 patent/WO2015091922A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2952644A1 (fr) * | 2009-11-17 | 2011-05-20 | Michelin Soc Tech | Pneumatique dont la bande de roulement comporte un elastomere thermoplastique |
FR2954333A1 (fr) * | 2009-12-23 | 2011-06-24 | Michelin Soc Tech | Pneumatique dont la zone sommet est pourvue d'une sous-couche comportant un elastomere thermoplastique |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016202970A1 (fr) * | 2015-06-18 | 2016-12-22 | Compagnie Generale Des Etablissements Michelin | Pneumatique pour vehicules destines a porter de lourdes charges |
FR3037593A1 (fr) * | 2015-06-18 | 2016-12-23 | Michelin & Cie | Pneumatique pour vehicules destines a porter de lourdes charges |
WO2017103387A1 (fr) * | 2015-12-18 | 2017-06-22 | Compagnie Generale Des Etablissements Michelin | Pneumatique pourvu d'une bande de roulement comprenant un elastomere dienique, un elastomere thermoplastique et un peroxyde |
FR3045632A1 (fr) * | 2015-12-18 | 2017-06-23 | Michelin & Cie | Pneumatique pourvu d'une bande de roulement comprenant un elastomere dienique, un elastomere thermoplastique et un peroxyde |
CN108586849A (zh) * | 2018-04-28 | 2018-09-28 | 平潭诚信智创科技有限公司 | 一种用于汽车轮胎的复合橡胶组合物及其制备方法 |
WO2023202915A1 (fr) * | 2022-04-21 | 2023-10-26 | Compagnie Generale Des Etablissements Michelin | Matrice élastomère comprenant un élastomère thermoplastique |
FR3134812A1 (fr) * | 2022-04-21 | 2023-10-27 | Compagnie Generale Des Etablissements Michelin | Matrice élastomère comprenant un élastomère thermoplastique |
Also Published As
Publication number | Publication date |
---|---|
BR112016014436A2 (pt) | 2018-05-15 |
FR3015492A1 (fr) | 2015-06-26 |
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