Process for the production of free-flowing rubber powders with silicic acid as filler

US4771092A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Reiner Ollenik · Marl, DE
• Walter Kleinert · Velen, DE
• Michael Mueller · Bensheim, DE

Key dates

• Filing date: Aug 18, 1987
• Grant date: Sep 13, 1988
• Expiry date: Aug 18, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2321/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of free-flowing rubber powders with silicic acid as filler comprises combining a rubber latex with silicic acid filler while stirring in the presence of specific auxiliary agents, adjusting the pH range of the mixture to cause coagulation, and separating and drying the resultant solids wherein the specific auxiliary agents comprise organic surfactants together with colloidal silicic acid.