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Synthesis of a Polydispersed Polybutadiene Latex. Direct Method for High-Solid Polybutadiene Emulsion Preparation

A high solid, polydispersed polybutadiene latex of large particle size was synthesized. The reaction was carried out at a high monomer/water ratio and a small quantity of emulsifier (soap). Additions of a colloidally active material with a high molecular weight and an electrolyte were effective in limiting the surface film of growing polymer particles governed by water structure or ionic environment and, also, in promoting the agglomeration of particles. A mixture of sodium alginate and magnesium sulfate was particularly effective, and provided a method with excellent reproducibility.