Classifications

• • 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
• • 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
• • 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
  • B60C1/0041—Compositions of the carcass layers
• • 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
  • C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
  • C08F222/10—Esters
  • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
  • C08F222/105—Esters of polyhydric alcohols or polyhydric phenols of pentaalcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/34—Silicon-containing compounds
  • C08K3/36—Silica
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/10—Esters; Ether-esters
  • C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/14—Peroxides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms
  • C08L23/083—Copolymers of ethene with unsaturated hydrocarbons only containing four or more carbon atoms with aliphatic polyenes, i.e. containing two or more carbon-to-carbon double bonds

Definitions

• the invention relates to tires and more particularly to those in which the composition of the tread or that of an inner layer comprises a polyfunctional acrylate derivative and a peroxide.
• the tire layers such as the tread or the inner layers must obey a large number of technical requirements, often contradictory, among which a low rolling resistance, a high resistance to wear, a good road behavior, as well that a good level of cohesion of the material.
• this stiffening of the tread can be obtained for example by increasing the rate of reinforcing filler or by incorporating certain reinforcing resins in the rubber compositions making up these treads.
• This stiffening of the tread can in a known manner reduce the rolling resistance properties, accompanied by a significant increase in the hysteretic losses of the rubber composition. Improving stiffness performance by keeping rolling resistance low is therefore a problem to be solved for tire designers.
• the Applicant has surprisingly discovered that the use of specific acrylate derivatives in a composition comprising a particular statistical copolymer comprising ethylene units and conjugated diene units, makes it possible to improve both the rolling resistance , rigidity and strengthening of the composition.
• the subject of the present invention is in particular a tire comprising a rubber composition based on:
• an elastomeric matrix mainly comprising a random copolymer comprising ethylene units and conjugated diene units, the molar fraction of the ethylene units in the copolymer being within a range ranging from 50% to 95%,
• o A represents a C 4 -C 30 hydrocarbon group, linear, branched or cyclic, interrupted and / or substituted by one or more heteroatoms, o A comprising p free valences, p having a value ranging from 2 to 6,
• R, R 2 and R 3 independently represent a hydrogen atom or a hydrocarbon group Ci-C 8 selected from the group consisting of linear alkyl groups, branched or cyclic, alkylaryl groups, aryl groups and aralkyl, and possibly interrupted by one or more heteroatoms, R 2 and R 3 can together form a non-aromatic ring,
• ⁇ (*) represents the point of attachment of the radical of formula (II) to A, o it being understood that the 2 to 6 radicals X are identical or different.
• composition based on is meant a composition comprising the mixture and / or the in situ reaction product of the various constituents used, some of these constituents being able to react and / or being intended to react with each other, less partially, during the different manufacturing phases of the composition; the composition thus being able to be in the fully or partially crosslinked state or in the non-crosslinked state.
• part by weight per hundred parts by weight of elastomer (or phr), it is to be understood in the sense of the present invention, the part, by mass per hundred parts by mass of elastomer.
• any range of values designated by the expression "between a and b” represents the range of values going from more than a to less than b (ie limits a and b excluded) while any range of values designated by the expression “from a to b” signifies the range of values ranging from a to b (that is to say including the strict limits a and b).
• the range represented by the expression "between a and b" is also and preferably described.
• a majority compound it is understood within the meaning of the present invention, that this compound is predominant among the compounds of the same type in the composition, that is to say that it is that which represents the greatest amount by mass among compounds of the same type.
• a majority elastomer is the elastomer representing the largest mass relative to the total mass of the elastomers in the composition.
• a so-called majority charge is that representing the largest mass among the charges of the composition.
• the majority elastomer represents more than half of the mass of the elastomers.
• the majority elastomer we mean present at more than 50%, preferably more than 60%, 70%, 80%, 90%, and more preferably the “majority” compound represents 100%.
• the compounds comprising carbon mentioned in the description can be of fossil origin or bio-based. In the latter case, they can be, partially or totally, from biomass or obtained from renewable raw materials from biomass. Are concerned in particular polymers, plasticizers, fillers, etc.
• composition of the tire according to the invention has the essential characteristic of comprising an elastomeric matrix mainly comprising a random copolymer comprising ethylene units and conjugated diene units (also called herein “the copolymer”), the molar fraction of the ethylene units in the copolymer being included in a range from 50% to 95%.
• the conjugated diene units are preferably chosen from the group consisting of butadiene units, isoprene units and mixtures of these diene units conjugated. More preferably, the conjugated diene units are mainly, or even preferentially exclusively, butadiene units.
• the microstructure of the copolymer is homogeneous.
• a copolymer is of homogeneous microstructure when for each of these units, at each instant of polymerization, the concentrations in the chain are identical or almost identical.
• the concentration is identical or almost identical to its concentration at the instant just before and after, and thus at any instant of the polymerization.
• the concentration is identical or almost identical to”, by “almost identical” is meant, within the meaning of the present invention, a variation of less than 2 mol%.
• the molar concentration in each of these units is constant along the chain of the copolymer.
• concentration of ethylene units and conjugated diene units is identical or almost identical in each segment .
• a sequence of 10 units may be a representative number.
• the concentration in ethylene units and in conjugated diene units is identical or almost identical throughout the chain of the copolymer.
• the concentration in each of the units will be able to be determined in advance depending on the nature of the catalytic system chosen and the operating conditions (concentrations and monomer pressure in particular).
• the molar fraction of the ethylene units in the copolymer is within a range ranging from 60% to 90%, preferably from 65% to 85%.
• the molar fraction of conjugated diene units (preferably butadiene units) in the copolymer is less than or equal to 50%. Preferably, it is included in a range ranging from 5% to 50%, preferably from 10% to 40%, preferably from 15% to 35%.
• the random copolymer comprising ethylene units and conjugated diene units can comprise trans-1,2-cyclohexane units.
• the molar fraction of trans-1,2-cyclohexane units in the copolymer is preferably between 0% and 25%, preferably from 1% to 10%, more preferably from 1% to 5%.
• the random copolymer comprising ethylene units and conjugated diene units can comprise vinylaromatic units.
• vinyl aromatic unit suitable, for example, styrene, ortho-, meta-, paramethylstyrene, the commercial "vinyl-toluene" mixture, paratertiobutylstyrene, methoxystyrenes, chlorostyrenes, vinyl mesitylene, divinylbenzene, vinylnaphthalene.
• the random copolymer comprising ethylene units and conjugated diene units does not comprise a vinyl aromatic unit.
• the random copolymer comprising ethylene units and conjugated diene units has a mass Mn ranging from 20,000 g / mol to 1,500,000 g / mol, more preferably ranging from 60,000 g / mol to 250,000 g / mol.
• the random copolymer comprising ethylene units and conjugated diene units has a polymolecularity index which is less than 2.5.
• the index Ip of said copolymers is less than 2 and, even more preferably, this index Ip is less than or equal to 1.9.
• the polymolecularity indices Ip were determined in the present application by steric exclusion chromatography.
• the random copolymer comprising ethylene units and conjugated diene units exhibits a glass transition temperature Tg which is less than 25 ° C. More precisely, these copolymers can for example have a temperature Tg of between -45 ° C and -20 ° C.
• the copolymer when the random copolymer comprising ethylene units and conjugated diene units further comprises trans-1,2-cyclohexane units, the copolymer has a crystallinity of less than 25%, more advantageously less than 15%, even more advantageously less at 10%.
• random copolymers comprising ethylene units and conjugated diene units which can be used in the context of the present invention can be obtained according to known synthesis methods, in particular those described in documents EP 1 092 731, EP I 554 321, EP 1 656400, EP 1 829 901, EP 1 954 705, EP 1 957 506, FR 3 045 612 or FR 3 045 613.
• the elastomeric matrix only comprises, as an elastomer, the random copolymer comprising ethylene units and conjugated diene units.
• the elastomeric matrix may also comprise a diene elastomer different from the random copolymer comprising ethylene units and conjugated diene units (also called herein "the other elastomer").
• the other elastomer when present, is in the minority, that is to say that it represents less than 50%, 40%, 30%, 20%, or even less than 10% by weight of the elastomeric matrix.
• the other elastomer of the elastomeric matrix of the tire according to the invention is preferably chosen from the group of highly unsaturated diene elastomers constituted by polybutadienes (abbreviated "BR"), synthetic polyisoprenes (IR), natural rubber (NR ), butadiene copolymers, isoprene copolymers and mixtures of these elastomers.
• BR polybutadienes
• IR synthetic polyisoprenes
• NR natural rubber
• butadiene copolymers butadiene copolymers
• isoprene copolymers and mixtures of these elastomers.
• Such copolymers are more preferably chosen from the group consisting of butadiene-styrene copolymers (SBR), isoprene-butadiene copolymers (BIR), isoprene-styrene copolymers (SIR), isoprene copolymers- butadiene-styrene (SBIR), butadiene-acrylonitrile copolymers (NBR), butadiene-styrene-acrylonitrile copolymers (NSBR) or a mixture of two or more of these compounds.
• SBR butadiene-styrene copolymers
• BIR isoprene-butadiene copolymers
• SIR isoprene-styrene copolymers
• SBR isoprene copolymers-butadiene-styrene copolymers
• NBR butadiene-acrylonitrile copolymers
• NSBR but
• the tire according to the invention comprises a composition which comprises at least one polyfunctional acrylate derivative of formula (I)
• o A represents a C 4 -C 30 hydrocarbon group, linear, branched or cyclic, interrupted and / or substituted by one or more heteroatoms, o A comprising p free valences, p having a value ranging from 2 to 6,
• R, R 2 and R 3 independently represent a hydrogen atom or a hydrocarbon group Ci-C 8 selected from the group consisting of linear alkyl groups, branched or cyclic, alkylaryl groups, aryl groups and aralkyl, and possibly interrupted by one or more heteroatoms, R 2 and R 3 can together form a non-aromatic ring,
• ⁇ (*) represents the point of attachment of the radical of formula (II) to A, o it being understood that the 2 to 6 radicals X are identical or different.
• cyclic alkyl group is meant an alkyl group comprising one or more rings.
• hydrocarbon group or chain interrupted by one or more heteroatoms means a group or chain comprising one or more heteroatoms, each heteroatom being between two carbon atoms of said group or of said chain, or between an atom of carbon of said group or of said chain and another heteroatom of said group or of said chain or between two other heteroatoms of said group or of said chain.
• hydrocarbon group or chain substituted by one or more heteroatoms means a group or chain comprising one or more heteroatoms, each heteroatom being linked to the group or the hydrocarbon chain by a covalent bond without interrupting the group or the hydrocarbon chain (e).
• the heteroatom (s) of the radicals Ri, R 2 and R 3 may be nitrogen, sulfur or oxygen atoms.
• R 2 and R 3 independently represent a hydrogen atom, a methyl group or an ethyl group. More preferably, Ri, R 2 and R 3 may each represent a hydrogen atom. Alternatively, R 2 and R 3 may each represent a hydrogen atom and Ri represents a methyl group.
• valence p depends on the nature of the radical A. According to the invention, p can be worth 2, 3, 4, 5 or 6. Preferably, p is worth 2, 3 or 4, preferably 2.
• the heteroatom (s) of A can be chosen from the group consisting of oxygen, sulfur, nitrogen, silicon, phosphorus atoms and their combinations.
• the heteroatom (s) of A are chosen from the group consisting of oxygen and sulfur atoms. More preferably, the heteroatom (s) of A are oxygen atoms.
• A advantageously represents a C 4 -C 30 hydrocarbon group, linear, branched or cyclic, interrupted and / or substituted by one or more heteroatoms chosen from oxygen, sulfur, nitrogen atoms, of silicon, phosphorus and their combinations, preferably chosen from the group consisting of oxygen and sulfur atoms. More preferably still A advantageously represents a C 4 -C 30 hydrocarbon group, linear, branched or cyclic, preferably linear or branched, interrupted and / or substituted by one or more oxygen and / or sulfur atoms, preferably interrupted and / or substituted by one or more oxygen atoms.
• A represents a C 4 -C 30 hydrocarbon group, linear, branched or cyclic, preferably linear or branched, interrupted by one or more oxygen and / or sulfur atoms, preferably interrupted by one or more atoms oxygen. More preferably, A represents a C 4 -C 30 hydrocarbon group, linear or branched, interrupted by one or more oxygen atoms.
• A represents a C 4 -C 30 hydrocarbon group, it may for example be a C 5 -C 2 o, preferably C 6 -Ci 6 hydrocarbon group.
• A comprises a cyclic hydrocarbon group
• it may be a non-aromatic or aromatic, preferably non-aromatic, cyclic hydrocarbon group.
• A represents a radical of formula (III):
• Z comprising q free valences, q having a value ranging from 2 to 6,
• [Y] q corresponds to a radical of formula (IV):
• R 4 represents a hydrogen atom or a methyl group
• m is an integer ranging from 1 to 13, preferably from 2 to 6,
• o (*) represents the point of attachment of the radical of formula (IV) to the radical of formula (II)
• o ( ⁇ ) represents the point of attachment of the radical of formula (IV) to Z
• o Z corresponds to a C 2 -C 2 o hydrocarbon group, linear or branched, preferably Z corresponds to a radical in the group consisting of:
• o is an integer ranging from 2 to 16, preferably from 4 to 10
• ( ⁇ ) represents the point of attachment of Z to the radical of formula (IV).
• SR264 polyethylene glycol (300) diacrylate
• SR268G tetraethylene glycol diacrylate
• SR306 tripropylene glycol diacrylate
• SR349 bisphenol A ethoxylate diacrylate (3)
• SR508 dipropylene glycol diacrylate
• CD561 hexanediol diacrylate (5) ethoxylate3 (5) propoxylated neopentylglycol (2)
• SR454 ethyoxylated trimethylolpropane triacrylate (3)
• SR492 propoxylated trimethylolpropane triacrylate
• SR494 ethoxylated penerythritol tetraacrylate (4)
• SR9020 triacrylate
• SR205 trieh
• A can represent a chosen radical in the group made up of:
• a polyfunctional acrylate derivative of formula (I) in which A represents a radical chosen from the group mentioned in the preceding paragraph mention may be made of those of the company Sigma-Aldrich: diethylene glycol diacrylate, diacrylate dipropylene glycol, dipentaerythriol pentaacrylate (DPPA), dipentaerythriol hexaacylate (DPHA); those of SARTOMER under the name di-trimethylolpropane tetraacrylate (SR355), di-pentaerythritol pentaacrylate (SR399), pentaerythritol triacrylate (SR444), diethylene glycol dimethacrylate (SR231), those of the company MIWON name MIRAMER M340, M410, M500, M600, M231; or those of IGM RESIN under the name PHOTOMER 4306, 4600, 4666.
• DPPA dipentaerythriol pentaacrylate
• DPHA dipentaerythriol
• the multifunctional acrylate derivative of formula (I) is preferably chosen from the group consisting of dipentaerythriol penta (meth) acrylate, dipentaerythriol hexa (meth) acylate, di (meth) acrylate diethylene glycol, dipropylene glycol di (meth) acrylate, ethoxylated hexanediol di (meth) acrylate, propoxylated hexanediol di (meth) acrylate, ethoxylated trimethylpropane tri (meth) acrylate, tri (meth) propoxylated trimethylpropane acrylate, ethoxylated pentaerythritol tetra (meth) acrylate, propoxylated pentaerythritol tetra (meth) acrylate, ethoxylated bisphenol A di (meth) acrylate, bisphenol A propoxylated di (meth) acrylate
• the multifunctional acrylate derivative of formula (I) is chosen from the group consisting of dipentaerythriol pentaacrylate, dipentaerythriol hexaacylate, diethylene glycol diacrylate, dipropylene glycol diacrylate, hexanediol diacrylate ethoxylate , propoxylated hexanediol diacrylate, ethoxylated trimethylpropane triacrylate, propoxylated trimethylpropane, ethoxylated pentaerythritol tetraacrylate, propoxylated pentaerythritol pentaerythritol tetraacrylate, bisphenol A propoxylated diacrylate, propoxylated bisphenol A diacryloxylated diacrylatehexanediol diacrylate ethoxylated, propoxylated neopentyl glycol diacrylate, ethoxylated glycerol triacrylate,
• the multifunctional acrylate derivative of formula (I) is preferably chosen from the group consisting of diethylene glycol diacrylate, dipropylene glycol diacrylate, ethoxylated hexanediol diacrylate, propoxylated hexanediol diacrylate, triacrylate of ethoxylated trimethylpropane, propoxylated trimethylpropane triacrylate, ethoxylated pentaerythritol pentaerythritol tetraacrylate, propoxylated pentaerythritol tetraacrylate, glycoxylated triethylacrylate, triethyl acrylate propoxylate, triethyl acrylate propoxylate,
• the amount of polyfunctional acrylate derivative of formula (I), in the composition of the tire according to the invention is preferably within a range ranging from 5 to 50 phr, preferably from 5 to 30 phr, preferably more than 5 to 20 phr, preferably more than 5 to 15 phr.
• the rubber composition of the tire of the invention uses a peroxide, which can be any peroxide known to those skilled in the art.
• the peroxides well known to those skilled in the art, it is preferable to use for the invention a peroxide chosen from the family of organic peroxides.
• the peroxide is an organic peroxide.
• organic peroxide is meant an organic compound, that is to say containing carbon, comprising a group -O-O- (two oxygen atoms linked by a single covalent bond).
• the organic peroxide is chosen from the group consisting of dialkyl peroxides, monoperoxycarbonates, diacyl peroxides, peroxyketals, peroxyesters, and their mixtures.
• the dialkyl peroxides are chosen from the group consisting of dicumyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy ) hexane, 2,5-dimethyl-2,5-di (t-amylperoxy) -hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, 2,5-dimethyl-2,5-di (t-amylperoxy) hexyne-3, a, a'-di - [(t-butyl-peroxy) isopropyl] benzene, a, a '-di - [(t-amyl-peroxy) isopropyl] benzene, di-t-amyl peroxide, 1, 3, 5-tri - [(t-butyl per
• Certain monoperoxycarbonates such as 00-tert-butyl-0- (2-ethylhexyl) monoperoxycarbonate, OO-tert-butyl-O-isopropyl monoperoxycarbonate, OO-tert-amyl-O-2- ethyl hexyl monoperoxycarbonate, and mixtures thereof , can also be used.
• the preferred peroxide is benzoyl peroxide.
• the preferred peroxides are chosen from the group consisting of 1,1-di- (t-butylperoxy) -3,3,5-trimethylcyclohexane, 4,4-di- (t-butylperoxy) valerate of n -butyl, ethyl 3,3-di- (t-butylperoxy) butyrate, 2,2-di- (t-amylperoxy) -propane, 3,6,9-triethyl-3,6,9- trimethyl-1,4,7-triperoxynonane (or cyclic trimer methyl ethyl ketone peroxide), 3,3,5,7,7-pentamethyl-1,2,4-trioxepane, 4,4-bis (t- amylperoxy) n-butyl valerate, 3,3-di (t-amylperoxy) ethyl butyrate, 1,1-di (t-butylperoxy)
• the peroxyesters are chosen from the group consisting of tert-butylperoxybenzoate, tert-butyleperoxy-2-ethylhexanoate, tert-butyleperoxy-3,5,5-trimethylhexanoate and their mixtures.
• the organic peroxide is chosen from the group consisting of dicumyl peroxide, aryl or diaryl peroxides, diacetyl peroxide, benzoyl peroxide, dibenzoyl peroxide, ditertbutyl peroxide, tertbutylcumyle, 2,5-bis (tertbutylperoxy) -2,5-dimethylhexane, n-butyl-4,4'-di (tert-butylperoxy) valerate, 00- (t-butyl) -0- (2- ethylhexyl) monoperoxycarbonate, tert-butyl peroxyisopropylcarbonate, tert-butyl peroxybenzoate, tert-butyl peroxy-3,5,5-trimethylhexanoate, 1,3 (4) -bis (tert-butylperoxyisopropyl) benzene and their, even more preferably in the group consisting of di
• the amount of peroxide is preferably within a range ranging from 0.1 to 10 phr. More preferably, the amount of peroxide in the composition is within a range ranging from 0.5 to 5 phr, preferably from 1 to 4 phr.
• composition of the tire according to the invention does not require a reinforcing filler, which is one of its advantages since this makes it possible to greatly reduce the hysteresis of the composition, and thus the rolling resistance of the tire.
• the composition of the tire according to the invention does not include a reinforcing filler or comprises less than 160 phr.
• the composition of the tire can comprise from 5 to 120 phr, preferably from 5 to 65 phr, preferably from 5 to 60 phr, preferably from 10 to 55 phr, of reinforcing filler, known for its capacities to reinforce a rubber composition suitable for the manufacture of tires.
• the reinforcing filler can be an organic filler such as carbon black, an inorganic filler such as silica or a mixture of these two types of filler.
• carbon blacks all carbon blacks are suitable, in particular the blacks conventionally used in tires or their treads.
• the reinforcing carbon blacks of the 100, 200, 300 series, or the blacks of the 500, 600 or 700 series grades ASTM D-1765-2017
• these carbon blacks can be used in an isolated state, as commercially available, or in any other form, for example as a support for some of the rubber additives used.
• the carbon blacks could for example already be incorporated into the diene elastomer, in particular isoprene, in the form of a masterbatch (see for example applications W097 / 36724-A2 or W099 / 16600-A1).
• organic fillers other than carbon blacks mention may be made of organic fillers of functionalized polyvinyl as described in applications W02006 / 069792-Al, W02006 / 069793-A1, W02008 / 003434-A1 and W02008 / 003435-A1 .
• reinforcing inorganic filler should be understood here any inorganic or mineral filler, whatever its color and its origin (natural or synthetic), also called “white” filler, “clear” filler or even “non-black” filler As opposed to carbon black, capable of reinforcing on its own, without other means than an intermediate coupling agent, a rubber composition intended for the manufacture of tires.
• certain reinforcing inorganic fillers can be characterized in particular by the presence of hydroxyl groups (-OH) on their surface.
• inorganic fillers in particular mineral fillers of the siliceous type, preferably silica (Si0 2 ) or of the aluminous type, in particular alumina (Al 2 0 3 ) are suitable.
• the silica used can be any reinforcing silica known to a person skilled in the art, in particular any precipitated or pyrogenic silica having a BET specific surface as well as a CTAB specific surface both of which are less than 450 m 2 / g, preferably included in a field ranging from 30 to 400 m 2 / g, in particular from 60 to 300 m 2 / g.
• the BET specific surface area of the inorganic filler is determined by gas adsorption using the Brunauer-Emmett-Teller method described in "The Journal of the American Chemical Society” ( Vol. 60, page 309, February 1938), and more precisely according to a method adapted from standard NF ISO 5794-1, annex E of June 2010 [multi-point volumetric method (5 points) - gas: nitrogen - vacuum degassing: a hour at 160 ° C - relative pressure range p / in: 0.05 to 0.17]
• CTAB specific surface values were determined according to standard NF ISO 5794-1, annex G of June 2010. The process is based on the adsorption of CTAB (N-hexadecyl-N, N, N-trimethylammonium bromide) on the "external" surface of the reinforcing filler.
• any type of precipitated silica can be used, in particular highly dispersible precipitated silicas (called “HDS” for “highly dispersible” or “highly dispersible silica”).
• HDS highly dispersible precipitated silicas
• These precipitated silicas, highly dispersible or not, are well known to those skilled in the art. Mention may be made, for example, of the silicas described in applications W003 / 016215-A1 and W003 / 016387-A1.
• silica “Ultrasil ® 5000gr” may especially be used, “Ultrasil ® 7000GR” of Evonik, silicas “Zeosil ® 1085GR,””Zeosil ® 1115 MP”, “Zeosil ® 1165 MP”, “ Zeosil ® Premium 200MP ",” Zeosil ® HRS 1200 MP "from the company Solvay.
• non-HDS silica the following commercial silicas can be used: “Ultrasil ® VN2GR”, “Ultrasil ® VN3GR” from Evonik, “Zeosil ® 175GR” from Silvay, “Hi” -Sil EZ120G (-D) “,” Hi-Sil EZ160G (-D) “,” Hi-Sil EZ200G (-D) “,” Hi-Sil 243LD “,” Hi-Sil 210 ",” Hi-Sil HDP 320G ”from PPG.
• inorganic fillers which may be used in the rubber compositions of the invention may also be mentioned mineral fillers of the aluminous type, in particular alumina (Al 2 0 3 ), oxides of aluminum, aluminum hydroxides, aluminosilicates, titanium oxides, silicon carbides or nitrides, all of the reinforcing type as described for example in applications W099 / 28376-A2, WOOO / 73372-A1, WO02 / 053634-A1, W02004 / 003067-A1, W02004 / 056915-A2, US6610261-B1 and US6747087-B2.
• aluminous type in particular alumina (Al 2 0 3 ), oxides of aluminum, aluminum hydroxides, aluminosilicates, titanium oxides, silicon carbides or nitrides, all of the reinforcing type as described for example in applications W099 / 28376-A2, WOOO / 73372-A1,
• reinforcing inorganic filler is also understood to mean mixtures of different reinforcing inorganic fillers, in particular of silicas as described above.
• a reinforcing filler of another nature could be used, since this reinforcing filler of another nature would be covered with an inorganic layer.
• an inorganic layer such as silica, or else would have on its surface functional sites, in particular hydroxyls, requiring the use of a coupling agent to establish the connection between this reinforcing filler and the diene elastomer.
• carbon blacks include partially or completely covered with silica, or carbon blacks modified by silica, such as, without limitation, expenses type "Ecoblack ®" Series CRX2000 ”or from the“ CRX4000 ”series from Cabot Corporation.
• an at least bifunctional coupling agent intended to ensure a sufficient connection, of chemical and / or physical nature, between the filler inorganic (surface of its particles) and the diene elastomer.
• organosilanes or polyorganosiloxanes which are at least bifunctional are used.
• bifunctional is meant a compound having a first functional group capable of interacting with the inorganic charge and a second functional group capable of interacting with the diene elastomer.
• such a bifunctional compound may comprise a first functional group comprising a silicon atom, the said first functional group being capable of interacting with the hydroxyl groups of an inorganic charge and a second functional group comprising a sulfur atom, the so-called second functional group being able to interact with the diene elastomer.
• the organosilanes are chosen from the group consisting of polysulphurized organosilanes (symmetrical or asymmetrical) such as bis tetrasulphide (3-triethoxysilylpropyl), in short TESPT marketed under the name "Si69” by the company Evonik or bis disulphide - (triethoxysilylpropyle), in short TESPD marketed under the name “Si75” by the company Evonik, polyorganosiloxanes, mercaptosilanes, blocked mercaptosilanes, such as S- (3- (triethoxysilyl) propyl) octanethioate marketed by the company Momentary under the name "NXT Silane”. More preferably, the organosilane is a polysulfurized organosilane.
• the content of coupling agent in the composition of the tire according to the invention is advantageously less than or equal to 10 phr, it being understood that it is generally desirable to use as little as possible.
• the level of coupling agent represents from 0.5% to 15% by weight relative to the amount of filler reinforcing inorganic. Its rate is preferably included in a range ranging from 0.5 to 7.5 phr, more preferably included in a range ranging from 3 to 3 phr. This level is easily adjusted by a person skilled in the art according to the level of reinforcing inorganic filler used in the composition of the invention.
• the reinforcing filler of the rubber composition of the tire according to the invention comprises a carbon black, a silica or one of their mixtures. Even more preferably, the reinforcing filler mainly comprises carbon black.
• the reinforcing filler can comprise, for example, from 50 to 100% by mass of carbon black, preferably from 55 to 90% by mass, preferably from 60 to 80% by mass. In a particularly advantageous manner, the reinforcing filler exclusively comprises carbon black.
• the rate of reinforcing filler preferably the reinforcing filler mainly comprising carbon black, in the composition of the tire according to the invention, is included in a range ranging from 10 to 55 phr, preferably from 15 to 50 phr, preferably 20 to 45 pce.
• composition of the tire according to the invention does not require a vulcanization system, which is one of its advantages since this makes it possible to simplify the formula, and the preparation of the composition. If, however, a vulcanization system is present in the composition, it is preferably present in small quantities.
• the actual vulcanization system is usually based on sulfur (or a sulfur-donating agent) and a primary vulcanization accelerator.
• sulfur or a sulfur-donating agent
• a primary vulcanization accelerator To this basic vulcanization system are added, incorporated during the first non-productive phase and / or during the productive phase as described later, various secondary accelerators or known vulcanization activators such as zinc oxide , stearic acid or equivalent compounds, guanidine derivatives (in particular diphenylguanidine).
• Molecular sulfur (or equivalently the molecular sulfur donor agents), when it is used, is at a rate preferably less than 0.5 phr.
• the composition does not contain molecular sulfur or of sulfur-donating agent as vulcanizing agent or contains less than 0.5 phr, preferably less than 0.3 phr, preferably even less than 0.1 pc. More preferably, the composition of the tire according to the invention does not contain molecular sulfur or a sulfur donor agent as a vulcanizing agent.
• the vulcanization system of the composition according to the invention may also comprise one or more additional accelerators, for example the compounds of the thiuram family, the zinc dithiocarbamate derivatives, sulfenamides, guanidines or thiophosphates.
• additional accelerators for example the compounds of the thiuram family, the zinc dithiocarbamate derivatives, sulfenamides, guanidines or thiophosphates.
• Any compound capable of acting as an accelerator for the vulcanization of diene elastomers in the presence of sulfur in particular accelerators of the thiazole type and their derivatives, accelerators of the thiuram type, zinc dithiocarbamates, can be used in particular.
• accelerators are more preferably chosen from the group consisting of 2-mercaptobenzothiazyl disulfide (abbreviated "MBTS”), N-cyclohexyl-2-benzothiazyle sulfenamide (abbreviated “CBS”), N, N-dicyclohexyl-2-benzothiazyle sulfenamide (abbreviated “DCBS”), N-tert-butyl-2-benzothiazyl sulfenamide (abbreviated “TBBS”), N-tert-butyl-2-benzothiazyl sulfenimide (abbreviated “TBSI”), zinc dibenzyldithiocarbamate (en abbreviated “ZBEC”) and mixtures of these compounds.
• MBTS 2-mercaptobenzothiazyl disulfide
• CBS N-cyclohexyl-2-benzothiazyle sulfenamide
• DCBS N-dicyclo
• composition of the tire according to the invention is preferably devoid of any vulcanization accelerator.
• the rubber compositions of the tire according to the invention may optionally also include all or part of the usual additives usually used in elastomer compositions for tires, such as for example plasticizers (such as plasticizing oils and / or plasticizing resins), pigments, protective agents such as anti-ozone waxes, chemical anti-ozonants, antioxidants, anti-fatigue agents, reinforcing resins (as described for example in application WO 02/10269).
• plasticizers such as plasticizing oils and / or plasticizing resins
• protective agents such as anti-ozone waxes, chemical anti-ozonants, antioxidants, anti-fatigue agents, reinforcing resins (as described for example in application WO 02/10269).
• composition of the tire of the invention is devoid of antioxidant agent.
• the composition of the tire of the invention is devoid of plasticizing agent.
• the composition according to the invention also comprises a plasticizing agent.
• this plasticizing agent is a solid hydrocarbon resin (or plasticizing resin), an extension oil (or plasticizing oil), or a mixture of the two.
• the present invention also relates to a finished or semi-finished rubber article, as well as a tire, comprising a composition in accordance with the present invention.
• the invention relates particularly to tires intended to equip motor vehicles of the tourism type, SUV ("Sport Utility Vehicles"), or two wheels (in particular motorcycles), or airplanes, or industrial vehicles chosen from vans, "Weight- heavy ”- ie metro, bus, road transport equipment (trucks, tractors, trailers), off-road vehicles such as agricultural or civil engineering equipment - and others.
• Three types of zones can be defined within the tire:
• the radially inner zone and in contact with the inflation gas this zone generally being constituted by the layer which is impermeable to the inflation gases, sometimes called the inner sealing layer or inner rubber.
• the internal zone of the tire that is to say that between the external and internal zones.
• This zone includes layers or plies which are called here internal layers of the tire. These are for example carcass plies, tread underlays, plies of tire belts or any other layer which is not in contact with the ambient air or the inflation gas of the tire.
• composition defined in the present description is particularly well suited to the internal layers and to the tire treads.
• the composition may be present in the tread and / or at least one internal layer of the tire.
• the internal layer can be chosen from the group consisting of carcass plies, crown plies, rod stuffing, crown feet, decoupling layers, border erasers, stuffing erasers, underlay -tread layer and combinations of these internal layers.
• the internal layer is chosen from the group consisting of carcass plies, crown plies, rod stuffing, crown feet, decoupling layers and combinations of these internal layers.
• the invention relates to the tires and semi-finished products for tires described above, to rubber articles, both in the raw state (that is to say, before baking) and in the cooked state (that is to say , after crosslinking or vulcanization).
• the rubber composition in accordance with the invention is manufactured in suitable mixers, using two successive preparation phases well known to those skilled in the art:
• thermomechanical working phase or kneading which can be carried out in a single thermomechanical step during which one introduces, into a suitable mixer such as a usual internal mixer (for example of the type 'Banbury'), all the necessary constituents, in particular the elastomeric matrix, any fillers, any other miscellaneous additives, with the exception of the crosslinking system.
• a suitable mixer such as a usual internal mixer (for example of the type 'Banbury')
• all the necessary constituents in particular the elastomeric matrix, any fillers, any other miscellaneous additives, with the exception of the crosslinking system.
• the incorporation of the possible filler into the elastomer can be performed once or several times by thermomechanically kneading.
• the non-productive phase can be carried out at high temperature, up to a maximum temperature between 110 ° C and 200 ° C, preferably between 130 ° C and 185 ° C, for a period generally between 2 and 10 minutes.
• a second mechanical working phase (so-called "productive" phase), which is carried out in an external mixer such as a cylinder mixer, after cooling of the mixture obtained during the first non-productive phase to a lower temperature , typically less than 120 ° C, for example between 40 ° C and 100 ° C.
• the crosslinking system is then incorporated, and the whole is then mixed for a few minutes, for example between 5 and 15 min.
• the final composition thus obtained is then calendered for example in the form of a sheet or a plate, in particular for a characterization in the laboratory, or else extruded in the form of a semi-finished (or profiled) rubber usable by example like a tire tread or an inner layer for a passenger vehicle.
• a semi-finished (or profiled) rubber usable by example like a tire tread or an inner layer for a passenger vehicle.
• the composition can be either in the raw state (before crosslinking or vulcanization), or in the cooked state (after crosslinking or vulcanization), can be a semi-finished product which can be used in a tire.
• crosslinking of the composition can be carried out in a manner known to those skilled in the art, for example at a temperature between 130 ° C. and 200 ° C., under pressure.
• the SEC makes it possible to apprehend the distribution of the molecular masses of a polymer.
• the molar masses were determined in 1,2,4-trichlorobenzene. They were first dissolved hot (4 h at 150 ° C), then they were injected at 150 ° C with a flow rate of 1 ml.
• the crystallinity measurement is made by comparison of the enthalpy of fusion observed in the case of RBEs. This endothermic phenomenon is observed during the analysis of the thermogram of the DSC (Differential Scanning Calorimetry) measurement. The measurement is made by round-trip scanning from -150 ° C to 200 ° C under an inert atmosphere (helium) with a ramp of 20 ° C / min.
• the signal corresponding to the endothermic phenomenon (fusion) is integrated and the degree of crystallinity is the ratio between the enthalpy measured and that of the perfectly crystalline polyethylene (290 J / g).
• the glass transition temperature, Tg is measured in the present application by the DSC (Differential Scanning Calorimetry) technique on a device of denomination "Setaram DSC 131".
• the temperature program used corresponds to a temperature rise of -120 ° C at 150 ° C at the speed of 10 ° C / min. Reference may be made to the method described in application WO 2007/054224 (page 11).
• the elongation at break (AR%) and rupture stress (CR) tests are based on standard NF ISO 37 of December 2005 on a H2 type dumbbell test piece and are measured at a tensile speed of 500 mm / min.
• the elongation at break is expressed in% of elongation.
• the breaking stress is expressed in MPa.
• the dynamic properties G * (10%), G * (25%) and tan (ô) max at 60 ° C are measured on a viscoanalyzer (Metravib VA4000), according to standard ASTM D 5992-96.
• the response of a sample of crosslinked composition is recorded (cylindrical test piece 4 mm thick and 400 mm 2 in section), subjected to a sinusoidal stress in alternating single shear, at the frequency of 10 Hz, under the defined conditions of temperature for example at 60 ° C according to standard ASTM D 1349-99, or as the case may be at a different temperature.
• a deformation amplitude sweep is carried out from 0.1 to 50% (outward cycle), then from 50% to 1% (return cycle).
• the measurements are carried out at a given temperature (for example 140 ° C.) with an oscillating chamber rheometer, according to standard DIN 53529 - part 3 (June 1983).
• the evolution of the rheometric couple, ACouple, as a function of time describes the evolution of the stiffening of the composition as a result of the vulcanization reaction.
• the measurements are processed according to DIN 53529 - part 2 (March 1983): T0 is the induction time (expressed in min), that is to say the time necessary for the start of the crosslinking reaction; ta (e.g. t95) is the time required to reach a conversion of a% (e.g. 95%), i.e. a% (e.g. 95%) of the difference between the minimum and maximum couples.
• T0 is the induction time (expressed in min), that is to say the time necessary for the start of the crosslinking reaction
• ta e.g. t95
• a% e.g
• the mixture is introduced into a paddle mixer (final filling rate: approximately 70% by volume), the initial tank temperature of which is approximately 90 ° C., successively, the elastomer, reinforcing filler, polyfunctional acrylate as well as the various other ingredients with the exception of the crosslinking system.
• Thermomechanical work (non-productive phase) is then carried out in one step, which lasts a total of approximately 3 to 4 min, until a maximum "fall" temperature of 150 ° C. is reached.
• the mixture thus obtained is recovered, it is cooled and then the crosslinking system (peroxide or sulfur as the case may be) is incorporated, on a mixer (homo-finisher) at 23 ° C or 50 ° C respectively, mixing the whole (phase productive) in a cylinder tool for an appropriate time (for example between 5 and 12 min).
• the crosslinking system peroxide or sulfur as the case may be
• compositions thus obtained are then calendered either in the form of plates (thickness of 2 to 3 mm) or of thin sheets of rubber for measuring their physical or mechanical properties, or extruded in the form of a profile.
• composition Cl acrylate derivatives in accordance with the invention
• composition Cl acrylate derivatives in accordance with the invention
• Tl control composition
• T2 control composition
• T3 control composition
• compositions T3 and Cl the amount of polyfunctional acrylate derivative was adjusted so that the compositions exhibited a constant molar ratio of (meth) acrylate function.
• Zinc oxide (industrial grade - Umicore company)
• a control composition T4 was thus prepared as indicated in point 111-2 above in order to compare it with the composition according to the invention (C1) above.
• Their formulations (in pce) and their properties have been summarized in Table 2 below.
• the results of CR and G * 25% at 60 ° C are presented in "base 100" compared to the control composition T4. The higher the value, the better the result.

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