A method for manufacturing an aqueous black pigment dispersion, including the steps of subjecting a mixture containing carbon black and an aqueous medium to media-less dispersion and adding a resin having anionic groups and a basic compound after the dispersion, wherein the carbon black has a carboxylic acid group on the surface such that the value produced by dividing the amount of carboxylic acid group present on the surface by BET value is 0.8 to 5.5 (mol/m.sup.2) and the resin having anionic groups is an urethane resin that satisfies (weight average molecular weight/acid value)<1,400 or a styrene acrylic resin that satisfies (weight average molecular weight/acid value)<120.

A method for producing modified recycled carbon black, the method including a main burner modification step of continuously supplying a main burner fuel, an oxygen-containing gas, and raw material recycled carbon black to a main burner combusting a fuel and generating a flame to perform combustion of the main burner fuel and while continuously generating a flame by the main burner, introducing the raw material recycled carbon black to the flame and passing the raw material recycled carbon black through the flame, and making a main burner total carbon combustion rate represented by Expression (1) below: Main burner total carbon combustion rate (%)=(A/(B+C))100 (1) less than 100.0%. The present invention can provide a method for producing modified recycled carbon black that can remove rubber residuals adhering to the surface of raw material recycled carbon black effectively and continuously.

The present invention relates to a process for the production of oxidized wet beaded carbon black. It has been found that carbon black can be wet beaded and oxidized subsequently. This process allows a better control of the degree of oxidation without damaging the beads. Moreover, the oxidized wet beaded carbon black can be beneficially used in a rubber composition to increase the properties of the resulting rubber product.

The present invention relates to a screw conveyor configured to produce oxidized wet beaded carbon black including a reaction chamber and at least one ozone inlet to supply ozone to the reaction chamber. It has been found that the destruction of carbon black beads can be reduced using a screw conveyor for the oxidization. Additionally, the oxidation of the wet beaded carbon black could be improved.

A carbon black is provided. The carbon black is produced through heat treatment of recycled carbon black. Since the carbon black is made from recycled carbon black, it is a kind of environmentally friendly carbon black.

A modified recycled carbon black having a N.sub.2SA of 50 m.sup.2/g or more and 250 m.sup.2/g or less, and having, in a Raman spectrum obtained by performing measurement at an excitation wavelength of 532 nm by laser Raman spectroscopy, a peak intensity of a peak having a peak top in a range of 1,58020 cm.sup.1, with the peak intensity of a peak having a peak top in a range of 1,35020 cm.sup.1 being 100, of 84 or more and 111 or less. The present invention can provide a recycled carbon black having strong bonding with rubber components and having high reinforcing properties for rubber products.

A non-ASTM low hysteresis carbon black chemically treated, and surface coated with a compound comprising at least one amine group and at least one thiol group, and/or di- and/or polysulfidic linkage is herein disclosed. The surface modified low hysteresis carbon blacks are post treated to remove excess surface modified compound to form refined surface modified low hysteresis carbon blacks.

An unrefined surface modified low hysteresis carbon black (SMLHCB) product is described herein. The unrefined surface modified low hysteresis carbon black product contains a low hysteresis carbon black having a surface that has been modified with from about 0.1 to about 50 wt % of a surface modifier attached thereto, wherein the surface modifier comprises an amino acid and at least one amine group.

A high stability polymer positive temperature coefficient (PPTC) material. The high stability PPTC material may include a polymer matrix, the polymer matrix defining a PPTC body, and a conductive filler component, disposed in the polymer matrix. The conductive filler component may include a plurality of carbon black particles, wherein the plurality of carbon black particles comprises an average particle size of 50 nm or less, and wherein the plurality of carbon black particles comprise a treated surface.

Provided is an ultra-high structure and high specific surface area carbon black based on high crystallinity and a preparation method thereof, an electrode slurry, and a battery. The ultra-high structure and high specific surface area carbon black based on high crystallinity satisfies the following characteristics: (1) the degree of crystallinity is equal to or more than 39%; (2) the BET specific surface area ranges from 200 m.sup.2/g to 763 m.sup.2/g; (3) the OAN ranges from 334 mL/100g to 548 mL/100g; and (4) the average particle diameter of primary particles is equal to or less than 35 nm.