Abstract: Provided is a method for easily producing an oxidized carbon black aqueous dispersion that can highly remove multivalent metal ions and exhibit excellent dispersion stability. A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane.

Abstract: Provided is a method for easily producing an oxidized carbon black aqueous dispersion that can highly remove multivalent metal ions and exhibit excellent dispersion stability. A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane.

Abstract: An aqueous binder for an inorganic fiber heat-insulating sound-absorbing member is cured by heating at low temperatures and is capable of providing a strong binder cured product. The inorganic fiber heat-insulating sound-absorbing member is produced by applying an aqueous binder to inorganic fibers and heating the resulting inorganic fibers at 180-220° C. The aqueous binder contains 5.5-10 parts by mass of an ammonium salt of an inorganic acid per 100 parts by mass of the total of an acrylic resin that has an acid value of 350-850 mgKOH/g and a crosslinking agent that contains at least one alkanol amine. The ratio of the total mole number of hydroxy groups, amino groups and imino groups in the crosslinking agent relative to the mole number of carboxyl groups in the acrylic resin is 0.8-1.5. The pH of the aqueous binder is adjusted to 5.0-8.0 by a basic compound.