摘要:
A method for producing a rubber composition, the method comprising a step of producing a pre-kneaded rubber composition by kneading a butadiene-based rubber and 1 to 20 parts by weight of a silane coupling agent per 100 parts by weight of the butadiene-based rubber and a step of kneading the pre-kneaded rubber composition and 30 to 200 parts by weight of a silica per 100 parts by weight of the butadiene-based rubber used for producing the pre-kneaded rubber composition.
摘要:
A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing monomer with a coordination catalyst to form a reactive polymer; and (ii) reacting the reactive polymer with a carboxylic or thiocarboxylic ester containing a silylated amino group.
摘要:
The present invention relates to a diene rubber composition reinforced with an inorganic filler comprising a thermoplastic polymer bearing, at at least one end, a silanol or silyl ether functional group. The presence of the functional thermoplastic polymer makes it possible to improve the compromise of performances, which are the handling and the grip, of a tyre having a tread that is based on such a composition.
摘要:
An object of the present invention is to provide a conjugated diene-based polymer capable of providing a polymer composition which is excellent in a reduction in fuel consumption when silica is incorporated as a filler, a process for producing the conjugated diene-based polymer, and a polymer composition comprising said conjugated diene-based polymers and silica. The present invention provides a conjugated diene-based polymer comprising a conjugated diene-based constitutional unit and a constitutional unit expressed by the following formula (I), wherein said constitutional unit expressed by the formula (I) is between one of the conjugated diene-based constitutional units and another one: (I) (wherein X1, X2 and X3 represent independently a group expressed by the following formula (II), a hydroxide group, or a hydrocarbon group, and at least one of X1, X2 and X3 is the group expressed by the formula (II), or a hydroxide group: (II) wherein R1 and R2 represent independently a hydrocarbon group having 1 to 6 carbon atoms which can contain a nitrogen atom, an oxygen atom, or a silicon atom, and R1 and R2 can be combined to form a ring structure).
摘要:
A modified conjugated diene polymer comprises a modifying group based on a low molecular weight compound having two or more tertiary amino groups and one or more alkoxysilyl groups in a molecule which bonds to a conjugated diene polymer obtained by polymerization of a conjugated diene compound or a conjugated diene polymer obtained by copolymerization of a conjugated diene compound and an aromatic vinyl compound. The process for producing the modified conjugated diene polymer comprises the steps of: polymerizing a conjugated diene compound or copolymerizing a conjugated diene compound and an aromatic vinyl compound in a hydrocarbon solvent using an alkali metal initiator and/or an alkaline earth metal initiator; and reacting active terminals of the resulting polymer with a low molecular weight compound having two or more tertiary amino groups and one or more alkoxysilyl groups in the molecule.
摘要:
A method for producing a conjugated diene polymer is provided that includes a step of polymerizing a conjugated diene-containing monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst, thus giving a polymer having a catalyst-derived alkali metal at one terminus of a polymer chain comprising a conjugated diene-based monomer unit, and a step of reacting the polymer obtained in the step of polymerizing and a trialkoxysilane compound represented by the formula below. (In the formula, M denotes an oxygen atom or a sulfur atom, R1, R2, and R3 independently denote an alkyl group having 1 to 4 carbon atoms, m denotes an integer of 1 to 5, and n denotes an integer of 0 to 5.) There are also provided a conjugated diene polymer produced by the production method, and a polymer composition containing a rubber component that includes the conjugated diene polymer and carbon black and/or silica, the total content of the carbon black and the silica being 5 to 200 parts by weight relative to 100 parts by weight of the rubber component.
摘要:
A process for producing a conjugated diene polymer composition, which comprises of polymerizing a conjugated diene compound or a conjugated diene compound and an aromatic vinyl compound in a hydrocarbon solvent in the presence of at least one compound selected from the group consisting of organoalkali metals and organoalkaline earth metals as an initiator and then reacting the active end of the resulting polymer with a low molecular compound represented by the following formula (1) or the following formula (2): wherein the variables R through R9 are as defined in the Specification.
摘要:
This invention discloses a process for synthesizing a dendrimer of a rubbery polymer comprising: (a) reacting a lithium terminated rubbery polymer with a halogenated silicon containing compound to produce a polymer which is terminated with halogenated silicon moieties, wherein the halogenated silicon contain compound has at least four halogen atoms which are bonded directly to silicon atoms, wherein the ratio of the lithium terminated rubbery polymer to halogen atoms in the halogenated silicon containing compound is within the range of 2:n to (n-1):n, wherein n represents the number of halogen atoms that are bonded directly to silicon atoms in the halogenated silicon containing compound, wherein the halogenated silicon containing compound contains at least three halogen atoms which are bonded directly to a silicon atom; (b) reacting the polymer which is terminated with halogenated silicon moieties with a molar excess of a tertiary alcohol to produce a polymer which is terminated with hydroxy silyl moieties; and (c) allowing the polymer which is terminated with the hydroxy silyl moieties to couple under conditions sufficient to produce a dendrimer containing siloxane linkages. It has also be found that similar dendrimers having improved processability can be make utilizing halogenated tin containing compounds in stead of the halogenated silicon containing compound.
摘要:
A process for producing a conjugated diene-based polymer which comprises, in the first modification, modifying a conjugated diene-based polymer having active chain ends, which is obtained by polymerizing a diene-based monomer singly or with other monomers and has a content of a cis-1,4 unit of 75% by mole or greater in the conjugated diene portion of the main chain, by reacting the active chain ends with a hydrocarbyloxysilane compound and reacting the modified polymer with a specific compound such as a hydrocarbyloxysilane compound, and a rubber composition containing the polymer modified in accordance with the above process and, preferably, 10 to 100 parts by weight of silica and/or carbon black per 100 parts by weight of the rubber component containing the modified polymer, are provided. The rubber composition containing silica and/or carbon black exhibits improved fracture properties, abrasion resistance, low heat buildup property and excellent workability. A process for producing a conjugated diene-based polymer exhibiting improved cold flow, a polymer produced in accordance with the process, and a rubber composition and a tire using the polymer are also provided.
摘要:
A vulcanizable rubber composition is presented that comprises an elastomer; a reinforcing filler selected from silica, carbon black, and mixtures thereof, a cure agent; and an amino alkoxy-modified silsesquioxane (AMS) comprising one or more compounds selected from the group consisting of an amino AMS, an amino/mercaptan co-AMS, an amino/blocked mercaptan co-AMS, mixtures thereof, and weak acid-neutralized solid and aqueous solutions thereof. Addition of such compounds to the rubber composition provides improved dynamic viscoelastic and mechanical properties of the vulcanized rubber compound and predict that tire components, especially tread stocks, will provide tires having improved snow traction, lower rolling resistance but equal wet traction, increased rebound, decreased hysteresis, and a general improvement in tire performance.