Sulfur-modified powdered polychloroprene rubber (PCR-121) was prepared by inverse coagulation. A new coating agent (SN) was developed that could generate in situ the coating layer by inverse coagulation. The results show that this is a low-cost, stable technology for the production of powdered rubber with a very low coating agent content. A powdering model based on the liquid-liquid stirring theory of noncoalescing, liquid-liquid dispersion was proven with uniform design testing. According to this model, the mass fraction of medium-scale particles (1-3 mm) was only related to the agitation speed in the experimental range. Scanning electron microscopy (SEM) analysis showed that the PCR-121 particles were single continuous particles coagulated from single chloroprene rubber latex drops. Energy spectrum analysis showed that a layer with higher Ca content was coated at the surface of PCR-121 particles, which made PCR-121 a free-flowing powdered rubber. The results show that the variation of Mooney viscosity (ML1+4 100 degrees C) from 30 to 130 had no obvious effect on the mechanical properties of PCR-121. Compared with bale CR121, PCR-121 had better mechanical properties. SEM analysis and energy spectrum analysis on the tensile fracture surfaces showed that the dispersion of compounding agents in PCR-121 was better than that in bale CR121, which resulted in better mechanical properties in PCR-121. (c) 2005 Wiley Periodicals, Inc.