摘要:
A method for modifying a resin which comprises the reaction of an unsaturated resin consisting of more than 95% by mass of carbon and hydrogen atoms with a hypohalogenous compound in at least one solvent in the presence of a hydroxylated compound. This method results in the synthesis of new resins having oxygenated and halogenated functions.
摘要:
Butadiene polymers are brominated using a quaternary ammonium or quaternary phosphonium tribromide as the brominating agent. The bromination is performed in a solvent mixture than contains at least one polyhalogenated alkane and at least one monohalogenated alkane. The process proceeds easily under mild conditions and allows high conversions to be achieved easily.
摘要:
Butadiene copolymers are brominated using certain quaternary ammonium or phosphonium tribromides as the brominating agent. The bromination is performed in solution in a mixture of n-butyl acetate and ethyl acetate. The bromination process proceeds easily under mild conditions, and produces a brominated product that has excellent thermal stability.
摘要:
The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises (a) obtaining a primarily modified polymer by carrying out a primary modification reaction wherein at least one member selected from the group consisting of an alkoxysilane compound and a silanol compound is introduced into the active alkali metal terminal of a conjugated diene based (co)polymer having an active alkali metal terminal, and (b) obtaining a secondarily modified polymer (a modified conjugated diene based (co)polymer) by subjecting the above-obtained primarily modified polymer to reactions comprising (b1) and (b2). (b1): a reaction with a condensation accelerator comprising a metal element. (b2): a reaction with at least one member selected from the group consisting of inorganic acids and metal halides.
摘要:
The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.
摘要:
The present invention is directed to a method of making a rubber composition, comprising the steps of A) obtaining a diene-based elastomer selected from the group consisting of natural rubber, synthetic polyisoprene, polybutadiene, solution polymerized styrene-butadiene rubber (SSBR), and emulsion polymerized styrene-butadiene rubber (ESBR); B) mixing the diene-based elastomer with a halogenating agent to form an intermediate elastomer; and C) mixing the intermediate elastomer with a carbon black. There is further disclosed a rubber composition made by the foregoing method, and a pneumatic tire comprising the rubber composition.
摘要:
Brominated polybutadiene polymers are recovered from a bromination reaction solution by forming the solution into droplets, thermally stripping the solvent from the droplets, and then washing the resulting particles. The washed particles are then recovered from the washing liquid. The droplets can be dispersed into a gaseous medium such as air and then transferred into a nonsolvent liquid for washing, or can be formed directly into the nonsolvent liquid. The process forms a particulate polymer material that is easily filterable and has low levels of volatile impurities and inorganic salts. Brominated polybutadiene polymers recovered in this manner are often very thermally stable.
摘要:
A polybutadiene brominating method uses a quaternary ammonium tribromide as the brominating agent. The brominating is performed in solution, and dual extractions recover the spent brominating agent and recombine it with fresh bromine to regenerate an active tribromide. Solvent and aqueous extraction streams can be purified and recycled as needed.
摘要:
Brominated and epoxidized organic compounds are useful flame retardants for polymers such as polystyrene. The organic compounds contain both bromine and oxirane groups, and have molecular weights of at least 1500. The brominated and epoxidized organic compounds can be prepared by sequentially brominating and epoxiding (in either order) a starting compound that contains multiple non-conjugated carbon-carbon double bonds.