Abstract:
A modified conjugated diene rubber is disclosed. A method for producing the modified conjugated diene rubber includes providing an alkali metal ion-containing conjugated diene rubber; and reacting the alkali metal ion-containing conjugated diene rubber with an alkoxysilane to generate the modified conjugated diene rubber, the alkoxysilane being of the structural formula: wherein R1, R2, R3 are each independently selected from a group consisting of oxygen-containing C2-C12 group and nitrogen-containing C3-C12 group, the oxygen-containing C2-C12 group has a carbon atom directly connected to oxygen atom of the alkoxysilane, the nitrogen-containing C1-C12 group has a nitrogen atom directly connected to oxygen atom of the alkoxysilane, and R4 is selected from a group consisting of C3-C12 of alkyl, alkenyl, aryl, and alkoxy.
Abstract:
A polyelectrolyte includes a first segment and a second segment, wherein the structure of the first segment is at least one of formula (1) and formula (2); the structure of the second segment is at least one of formula (3) and formula (4). The polyelectrolyte undergoes microphase separation to form a nanoscale ordered self-assembled microstructure.
Abstract:
A process for the continuous synthesis of diene elastomers with a high degree of conversion, including simultaneously: h) introducing continuously into a polymerisation reactor containing a gas phase and equipped with at least one stirring rotor and a discharge device, at least iii. one or more monomers, including at least one conjugated diene monomer, and iv. from 0% to 70% by mass of an organic solvent, calculated relative to the total mass of monomers and of solvent i) continuously polymerising the monomer(s), j) stirring the polymerisation medium via the continuous movement of at least one stirring rotor about a rotary axle, k) continuously discharging the elastomer paste, l) continuously conveying the discharged elastomer paste to a chopping device and chopping it into particles, and m) removing solvent from the particles of the elastomer paste and n) recovering diene elastomer; wherein 1 the degree of conversion is at least 60%, at the limit of the first third of the reaction volume of the polymerisation reactor, and 2 the standard deviation of the residence time distribution function in the polymerisation reactor is greater than the mean residence time divided by 2√3.
Abstract:
There is provided a hydrogenated branched conjugated diene copolymer prepared by copolymerizing 1 to 99% by weight of a branched conjugated diene compound (1): wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, 99 to 0% by weight of a conjugated diene compound (2): wherein R2 and R3 are the same or different and each is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms or a halogen atom, and/or 99 to 0% by weight of a vinyl compound (3): wherein R4 is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms, an alicyclic hydrocarbon group having 3 to 8 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and then hydrogenating the resulting copolymer. The hydrogenated branched conjugated diene copolymer is useful as a rubber component of a rubber composition for a tire exhibiting excellent processability, enhancing both of abrasion resistance and grip performance to a high level and inhibiting generation of bleeding.
Abstract:
The present invention relates to a conjugated diene based polymer comprising a monomer unit derived from at least one conjugated diene selected from 1,3-butadiene and isoprene and a monomer unit derived from a compound represented by Formula (1): wherein n represents an integer of 0 to 5; R11, R12 and R13 each independently represent an alkyl group having 1 to 10 carbon atoms.
Abstract translation:本发明涉及包含衍生自至少一种选自1,3-丁二烯和异戊二烯的共轭二烯的单体单元和衍生自由式(1)表示的化合物的单体单元的共轭二烯系聚合物:其中n表示整数 0至5; R 11,R 12和R 13各自独立地表示碳原子数1〜10的烷基。
Abstract:
The method for preparation of polyisoprene includes conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, and the weight ratio of content of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1. The molecular weight distribution of the polyisoprene obtained with the method provided is bimodal distribution; therefore, the polyisoprene not only has the mechanical properties of polyisoprene with high molecular weight, but also has the processability of polyisoprene with low molecular weight.
Abstract:
For a tire excellent in strength, low-heat buildup property, wet grip property, and driveability, and a rubber composition and a conjugated diene rubber for the tire, a conjugated diene rubber of the present invention includes 5 wt % or more of a structure that 3 or more conjugated diene polymer chains are bound via a denaturing agent, obtained by reaction of each chain and the agent, each chain being that at least one of terminals is an isoprene block having 70 wt % or more of an isoprene monomer unit, and the other is an active terminal, the agent having, per molecule, at least one of an epoxy group(s) and a hydrocarbyloxysilyl group(s), and being that a total number of the epoxy group(s) and hydrocarbyloxy groups in the hydrocarbyloxysilyl group(s) per molecule is 3 or more.
Abstract:
The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium. The subject invention more specifically reveals an emulsion polymerization process that comprises: (1) preparing a monomer solution which is comprised of (a) at least one monomer, (b) a conjugate acid of a surfactant with a pKa of less than 14, and (c) a controlled free radical polymerization agent; (2) preparing an aqueous medium which is comprised of (a) water, and (b) a conjugate base of a weak acid wherein the pKb of the base is less than 14; and (3) mixing the monomer solution with the aqueous medium under conditions that result in the in-situ formation of an emulsifier, and (4) initiating free radical polymerization.
Abstract:
There is provided a rubber composition for a tread having excellent hardness and improving the processability and grip performance of a tire, and a tire comprising thereof. A rubber composition for a tread comprising 30 to 80 parts by weight of silica having a BET specific surface area of less than 150 m2/g and 10 parts by weight or less of carbon black based on 100 parts by weight of a rubber component comprising an epoxidized natural rubber, and a tire comprising thereof.
Abstract:
A process for the preparation of a functionalized, coupled or starred block copolymer which is usable in a sulphur-cross-linkable rubber composition of reduced hysteresis in the cross-linked state, one at least of said blocks consisting of a polyisoprene and at least one other block consisting of a diene elastomer other than a polyisoprene the molar ratio of units originating from one or more conjugated dienes of which is greater than 15%. The process includes the steps of: (i) copolymerization of one or more monomers comprising a conjugated diene other than isoprene using a catalytic system comprising a hydrocarbon solvent, a compound A of a metal of group IIIA, a compound B of an alkaline-earth metal and a polymer initiator C comprising a C—Li bond which is formed of a monolithiated polyisoprene intended to form the polyisoprene, said polyisoprene block(s) having a number-average molecular weight Mn1 of between 2,500 and 20,000 g/mol, so that said block(s) other than a polyisoprene has/have a content of trans-1,4 linkages equal to or greater than 70% and a number-average molecular weight Mn2 of between 65,000 and 350,000 g/mol, and (ii) addition to the product of copolymerization of a functionalizing, coupling or starring agent comprising one, two or at least three epoxy groups respectively, so that said block other than a polyisoprene is functionalized, coupled or starred.