摘要:
The invention relates to a tyre tread comprising an elastomer composition reinforced with silica and made from at least (pce = parts by weight per 100 parts of diene elastomer): (i) a diene elastomer; (ii) by way of a reinforcing filler, more than 80 pce of an inorganic filler consisting wholly or partly of a silica (called LS) having the following characteristics: (a) a BET specific surface area of between 50 and 100 m2/g; (b) an average particle size d¿w? of between 50 and 350 nm; (iii) a coupling agent that is used to link the reinforcing inorganic filler and the diene elastomer; (iv) a sulphur-based vulcanisation system. Preferably, said LS silica has a deagglomeration speed α that is greater than 5.10 -3 νm-1/min (measured with the deagglomeration test using ultrasound). In comparison to a standard tyre tread for green tyres reinforced with a silica having a higher specific surface area, the inventive tyre tread is provided with an improved performance trade-off in terms of wear resistance, rolling resistance, adhesion and drift thrust.
摘要:
The invention concerns a tyre or a running tread incorporating an elastomeric composition with improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as coupling agent (inorganic filler/elastomer), a bis-alkoxysilane tetrasulphide of formula (I) wherein: the symbols R1, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 4 carbon atoms; R2 and R3, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 6 carbon atoms and the phenyl radical; x is an integer or a fraction number between 3 and 5.
摘要:
The invention relates to a tyre sidewall having a rubber composition containing at least one diene elastomer, a reinforcing filler containing carbon black and a vulcanisation system, characterised in that the carbon black has a CTAB specific surface higher than or equal to 90 m 2 /g, and in that the proportion of carbon black is 30 to 40 pce.
摘要:
The invention relates to a diene rubber composition which is made from at least (i) one diene elastomer, (ii) a reinforcing inorganic filler and (iii) a coupling agent that links the reinforcing filler and the elastomer. The inventive composition is characterised in that said inorganic filler comprises at least one silicon having the following characteristics: (a) a specific surface area BET of between 45 and 400 m2/g and, preferably, of between 50 and 300 m2/g; (b) a specific surface area CTAB of between 40 and 380 m2/g and, preferably, of between 45 and 280 m2/g; (c) an average particle size (in mass), denoted d¿w?, of 20 to 300 nm. Moreover, said filler comprises at least one, preferably two or better still three, of the following characteristics: (d) a particle size distribution such that dw ≥ (16500/CTAB)-30; (e) a porosity that verifies criterion L/IF ≥ 0.0025 CTAB + 0.85; (f) a rate of silanols per surface unit, denoted NSiOH/nm?2¿, N¿SiOH/nm?2 ≤ 0.027 CTAB + 10.5. Said silicas can be obtained according to an original preparation method. The invention also relates to the use of said diene rubber compositions for the production of tyres or semi-finished products intended for tyres and to said products and tyres.
摘要:
The invention relates to a diene rubber composition which is made from at least (i) one diene elastomer, (ii) a reinforcing inorganic filler and (iii) a coupling agent that links the reinforcing filler and the elastomer. The inventive composition is characterised in that said inorganic filler comprises at least one silicon having the following characteristics: (a) a specific surface area BET of between 45 and 400 m2/g and, preferably, of between 50 and 300 m2/g; (b) a specific surface area CTAB of between 40 and 380 m2/g and, preferably, of between 45 and 280 m2/g; (c) an average particle size (in mass), denoted d¿w?, of 20 to 300 nm. Moreover, said filler comprises at least one, preferably two or better still three, of the following characteristics: (d) a particle size distribution such that dw ≥ (16500/CTAB)-30; (e) a porosity that verifies criterion L/IF ≥ 0.0025 CTAB + 0.85; (f) a rate of silanols per surface unit, denoted NSiOH/nm?2¿, N¿SiOH/nm?2 ≤ 0.027 CTAB + 10.5. Said silicas can be obtained according to an original preparation method. The invention also relates to the use of said diene rubber compositions for the production of tyres or semi-finished products intended for tyres and to said products and tyres.
摘要:
The invention relates to a tyre comprising at least one rubber composition based on at least one blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content of greater than or equal to 20 parts per hundred parts of elastomer, phr, and a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin with a glass transition temperature, Tg, greater than or equal to 20°C and that the SBR has a Tg greater than or equal to -65°C.
摘要:
The invention concerns a tyre or a running tread incorporating an elastomeric composition with improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as coupling agent (inorganic filler/elastomer), a bis-alkoxysilane tetrasulphide of formula (I) wherein: the symbols R1, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 4 carbon atoms; R2 and R3, identical or different, represent each a monovalent hydrocarbon group selected among alkyls, linear or branched, having 1 to 6 carbon atoms and the phenyl radical; x is an integer or a fraction number between 3 and 5.
摘要:
The invention relates to a tyre tread comprising an elastomer composition reinforced with an inorganic filler and made from at least: (i) a diene elastomer; (ii) by way of a reinforcing inorganic filler, more than 80 pce of a silica having a low specific surface area and the following characteristics: (a) a BET specific surface area of less than 130 m2/g; (b) an average particle size d¿w? of between 30 and 300 nm; (iii) a coupling agent that is used to connect the reinforcing inorganic filler and the diene elastomer; (iv) and a vulcanisation system comprising sulphur, a vulcanisation accelerator and, by way of a vulcanising activator, between 0.5 and 1.5 pce of zinc. Preferably, said silica has a deagglomeration speed α that is greater than 5.10?3 νm1¿/min (measured with the deagglomeration test using ultrasound). In comparison to a standard tyre tread for green tyres reinforced with a silica having a higher specific surface area, the inventive tyre tread is provided with an improved performance trade-off (wear resistance/rolling resistance/wet surface adhesion). Owing to the low zinc level, an increase in induction times during vulcanisation can be mitigated when a silica having a low specific surface area is used.
摘要:
The invention relates to a tyre tread comprising an elastomer composition reinforced with an inorganic filler and made from at least: (i) a diene elastomer; (ii) by way of a reinforcing inorganic filler, more than 80 pce of a silica having a low specific surface area and the following characteristics: (a) a BET specific surface area of less than 130 m2/g; (b) an average particle size d¿w? of between 30 and 300 nm; (iii) a coupling agent that is used to connect the reinforcing inorganic filler and the diene elastomer; (iv) and a vulcanisation system comprising sulphur, a vulcanisation accelerator and, by way of a vulcanising activator, between 0.5 and 1.5 pce of zinc. Preferably, said silica has a deagglomeration speed α that is greater than 5.10?3 νm1¿/min (measured with the deagglomeration test using ultrasound). In comparison to a standard tyre tread for green tyres reinforced with a silica having a higher specific surface area, the inventive tyre tread is provided with an improved performance trade-off (wear resistance/rolling resistance/wet surface adhesion). Owing to the low zinc level, an increase in induction times during vulcanisation can be mitigated when a silica having a low specific surface area is used.