PROCESS FOR PRODUCING NATURAL RUBBER REDUCED IN VISCOSITY, NATURAL RUBBER REDUCED IN VISCOSITY OBTAINED BY THE PROCESS, AND RUBBER COMPOSITION CONTAINING THE SAME

摘要

A process for producing a natural rubber made to have a low viscosity or constantly low viscosity which comprises (i) treating a natural-rubber latex with a water-soluble ammonium salt to reduce the metal content in the natural-rubber latex and (ii) subsequently spraying the treated natural-rubber latex in a pulse wave atmosphere, optionally after adding a viscosity stabilizer, to thereby conduct pulse drying and obtain a solid rubber. Also provided is a natural rubber obtained by the process. It has excellent mechanical properties, has a low viscosity or a constantly low viscosity, and has excellent processability.