摘要:
The invention concerns block copolymers for forming an elastomer matrix of a crosslinkable rubber composition with reduced hysteresis, said rubber composition which is useable in crosslinked state in a tyre running tread, said running tread and the tyre comprising it exhibits reduced running resistance. The inventive copolymer with n blocks (n = 2 or 3), each of the blocks comprising a diene elastomer whereof the mol ratio of units derived from conjugated dienes is higher than 15 %, and one of said blocks forming a chain end of said copolymer consisting of a polyisoprene, respectively for n = 2 or n = 3, is such that: the mean mole weight Mn1 of said or each end polyisoprene block substantially ranges between 2500 and 20000 g/mol and the mean mole weight Mn2 of said copolymer block which is different from said or each end polyisoprene block ranges substantially between 80000 g/mol and 350000 g/mol.
摘要:
The invention concerns a crosslinkable or crosslinked rubber composition having improved hysteretic properties when crosslinked useful for producing a tyre running tread, a method for preparing such a crosslinkable composition, such a running tread and a tyre exhibiting reduced rolling resistance. The inventive rubber composition is based on an elastomer matrix comprising at least a diene elastomer including a carboxylic acid function at one or at each of its two chain ends, and a reinforcing filler including an inorganic reinforcing filler, and is such that said diene elastomer has a mole weight higher than 80000 g/mol and it is present in major amount in said elastomer matrix.
摘要:
The invention concerns a crosslinkable or crosslinked rubber composition having improved hysteretic properties when crosslinked which is useful for forming a tyre running tread, a method for preparing said crosslinkable composition, such a running tread and a tyre having reduced rolling resistance. Said composition is characterised in that it consists of: at least a diene elastomer having a mol ratio of units derived from conjugate dienes higher than 30 % and comprising carboxylic acid functions along its chain, and a reinforcing inorganic filler.
摘要:
The invention relates to: a method of preparing a two-block copolymer which can be used in a sulphur-crosslinkable rubber composition having reduced hysterises in the crosslinked state; one such block copolymer in which one of the blocks comprises a polyisoprene and the other block comprises a diene elastomer other than polyisoprene; and said rubber composition which is intended for tyre treads. The inventive method of preparing said copolymer consists in copolymerising one or more monomers comprising a conjugated diene other than isoprene using a catalytic system containing: at least one hydrocarbon solvent; a compound A of a metal from group IIIA; a compound B of an alkaline-earth metal; and a polymer initiator C comprising a bond C-Li which is formed by a monolithiated polyisoprene that is intended to form said polyisoprene block, the number-average molecular weight Mn1 of said polyisoprene block having a value of between 2 500 and 20 000 g/mol. In this way, said method can be used to obtain the aforementioned copolymer in which the other block comprising the diene elastomer has a number-average molecular weight Mn2 of between 65 000 and 350 000 g/mol and a 1,4-trans chaining content that is equal to or greater than 70 %.
摘要:
A process for preparing a functionalized or unfunctionalized diene block copolymer comprising at least one polyether block of number-average molecular weight approximately from 150 to 5000 g/mol linked to at least one block constituted of a diene elastomer via at least one silicon atom. The process allows a high degree of grafting of the polyether to the polymer chains. Also disclosed is a reinforced rubber composition, especially intended for the manufacture of tires, comprising such a diene block copolymer which is intended to interact with the reinforcing filler. Such a rubber composition has improved hysteresis properties in the vulcanized state, while retaining satisfactory processing properties in the non-vulcanized state.
摘要:
The inventive plasticising system is used for plasticising a dienic rubber compound is characterised in that it is based on a MES or TDAE oil and a polylimonene resin. Said rubber compound exhibits an improved abrasion and cut resistance and is based on at least one type of dienic elastomer, a reinforcing filler, a cross-linking system and a plasticising system comprising from 5 to 35 pce of the MES or TDAE oil and from 5 to 35 pce of polylimonene resin (pce=parts by weight per cent elastomer). Advantageously, said plasticising system also comprises a glycerol unsaturated fatty acid triester (C12-C22), preferably a glycerol trioleate. The inventive method for producing said compound, using the compound for producing a final or semi-final product for the gripping system of a motor vehicle with ground, in particular the tire or the thread thereof are also disclosed.
摘要:
The invention relates to a functionalised diene elastomer consisting of a) a diene elastomer functionalised at the end of the chain or in the middle of the chain by a tin function, having a monomodal molecular mass distribution before functionalisation and a polydispersity index that is less than or equal to 1.3 before functionalisation, b) a diene elastomer that is star-branched with a tin compound and has a monomodal mass distribution before star formation and a polydispersity index that is less than or equal to 1.3 before star formation, and c) a non-functional tin diene elastomer at a rate of less than 15 weight % in relation to the total weight of the functionalised diene elastomer. Said diene elastomers a), b), and c) have the same nature before any functionalisation or star formation.
摘要:
The invention relates to a block diene elastomer having the following formula: (I) where: n and m are each integers greater than or equal to 0, such that n+m≥1 and n+m ≤20; each block A consists of a polybutadiene; each block B consists of a diene elastomer, the molar level of units derived from conjugate dienes of which is greater than 15%, the blocks B being identical to one another; X is an organic or inorganic group, which can contain a function interacting with a reinforcing filler; the number-average molecular weight Mn1 of each Block A varies from 2500 to 20,000 g/mol; the number-average molecular weight Mn2 of each block B varies from 80,000 to 350,000 g/mol; and the chaining rate 1,2 in each block A is comprised between 1 and 20%.