Process for the production of latices based on conjugated dienes by emulsion polymerisation

摘要

Latices based on conjugated dienes are produced using emulsion polymerization by introducing the monomers to be polymerized into the initially introduced seed latex in the presence of a free-radical forming activator and an emulsifier in such a manner that the ratio of the monomer polymerization rate to the monomer feed rate is less than 0.7:1 and by performing polymerization up to a monomer conversion of >/=95% at temperatures of 10 to 85 DEG C., wherein the addition of the emulsifier is controlled in such a manner that the final particle size (TGL) of the latex to be produced is governed by the following equation:TGL=TGSx(mL/DL)+E,fra 1/3+EE (mS/DS)+E,fra 1/3+EE ,in which DL=density of the latex particles in the latex to be produced DS=density of the particles of the seed used mL=mass of the latex particles in the latex to be produced mS=mass of the particles of the seed used TGL=particle size of the latex to be produced TGS=particle size of the seed used.