Continuous procedure for the production of a diene based synthetic rubber latex whose particle diameter is in the range between 1500 and 4000 angstroms

Process for the continuous production of a diene based synthetic rubber latex whose particle diameter is in the range between 1500 and 4000 A through an emulsion polymerization including the steps of feeding to the first autoclave in a system consisting of a single autoclave furnished with a stirrer or a series of autoclaves furnished with stirrers the following ingredients separately or in admixture:

• a. 100 parts of a monomer consisting of a conjugated diolefin or of a mixture of monomers consisting of one or more conjugated diolefins at a total concentration of at least 80% and the balance selected from styrene, .alpha.-methylstyrene, acrylonitrile, methacrylonitrile, alkylic acrylates and methacrylates as such or in admixture;
• b. from 60 to 300 parts of water and from 0.5 to 5 parts of one or more organic emulsifying agents in solution in said water;
• and
• c. from 0.01 to 2 parts of a polymerization promoter, and collecting polymerization product from the autoclave system at a rate such that the residence time of such ingredients in the autoclave system is in the range between 2 hours and 30 hours, and maintaining the temperature in said autoclave system in the range between 70.degree. and 140.degree. C.