Process for the preparation of a diene rubber latex (S-A1) by emulsion polymerization which process comprises steps to: providing in a reactor an initial composition comprising at least one conjugated diene, preferably butadiene, at least one vinylaromatic monomer, preferably styrene, at least one chain transfer agent, at least one emulsifier, at least one initiator and water, wherein the amount of the conjugated diene is 22 to 32 wt.-% - based on the total weight of the conjugated diene used in the process, the amount of the vinylaromatic monomer is 22 to 32 wt.-% - based on the total weight of the vinyl aromatic monomer used in the process, and the amount of the chain transfer agent is 22 to 32 wt.-% - based on the total weight of the chain transfer agent used in the process; polymerization of the initial composition for 30 to 90 minutes, preferably 50 to 70 minutes; within 70 to 110 minutes continuous feeding to the composition obtained in step of: further 10 to 25 wt.-% conjugated diene - based on the total weight of the conjugated diene used in the process -, further 15 to 30 wt.-% vinylaromatic monomer - based on the total weight of the vinylaromatic monomer used in the process -, and further 20 to 35 wt.-% chain transfer agent - based on the total weight of the chain transfer agent used in the process -; further polymerization of the composition obtained in step for 30 to 90 minutes, preferably 45 to 75 minutes; within 200 to 300 minutes, preferably 230 to 250 minutes, continuous feeding to the composition obtained in step of: remaining conjugated diene, remaining vinylaromatic monomer (based on a total of 100 wt.-%, each), and of remaining chain transfer agent (based on a total of 100 wt.-%); further polymerization of the composition obtained in step up to completion - preferably up to a conversion rate of 92 to 96% - of the polymerization - where in all steps to the (reactor) temperature is kept at 60 to 75°C, preferably 65 to 70°C. providing in a reactor an initial composition comprising at least one conjugated diene, preferably butadiene, at least one vinylaromatic monomer, preferably styrene, at least one chain transfer agent, at least one emulsifier, at least one initiator and water, wherein the amount of the conjugated diene is 22 to 32 wt.-% - based on the total weight of the conjugated diene used in the process, the amount of the vinylaromatic monomer is 22 to 32 wt.-% - based on the total weight of the vinyl aromatic monomer used in the process, and the amount of the chain transfer agent is 22 to 32 wt.-% - based on the total weight of the chain transfer agent used in the process; polymerization of the initial composition for 30 to 90 minutes, preferably 50 to 70 minutes; within 70 to 110 minutes continuous feeding to the composition obtained in step of: further 10 to 25 wt.-% conjugated diene - based on the total weight of the conjugated diene used in the process -, further 15 to 30 wt.-% vinylaromatic monomer - based on the total weight of the vinylaromatic monomer used in the process -, and further 20 to 35 wt.-% chain transfer agent - based on the total weight of the chain transfer agent used in the process -; further 10 to 25 wt.-% conjugated diene - based on the total weight of the conjugated diene used in the process -, further 15 to 30 wt.-% vinylaromatic monomer - based on the total weight of the vinylaromatic monomer used in the process -, and further 20 to 35 wt.-% chain transfer agent - based on the total weight of the chain transfer agent used in the process -; further polymerization of the composition obtained in step for 30 to 90 minutes, preferably 45 to 75 minutes; within 200 to 300 minutes, preferably 230 to 250 minutes, continuous feeding to the composition obtained in step of: remaining conjugated diene, remaining vinylaromatic monomer (based on a total of 100 wt.-%, each), and of remaining chain transfer agent (based on a total of 100 wt.-%); further polymerization of the composition obtained in step up to completion - preferably up to a conversion rate of 92 to 96% - of the polymerization -