PROCESS FOR PREPARING CARBON-BLACK-FILLED RUBBER POWDERS BASED ON AQUEOUS POLYMER-LATEX EMULSIONS

• Main Authors: SCHMITT, MATTHIAS, STOBER, REINHARD, GORL, UDO
• Format: Patent
• Language: English; French
• Published: 09.12.2008
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

Disclosed is a process for preparing fine-particle carbon black-filled rubber powder grains from a rubber-latex emulsion and carbon black by precipitation. The process avoids use of a water soluble salt of a metal of Group IIa, IIb, IIIa or VIII of the Periodic Table of the Elements and an alkali metal silicate. The precipitation is conducted by mixing the rubber-latex emulsion with an aqueous suspension of a portion of the carbon black while adding a Bronsted acid (e.g. H2SO4) either before or after the mixing and later adding an aqueous suspension of the remaining portion of the carbon black.