METHOD OF BUTADIENESTYRENE LATEX PREPARING Russian patent published in 1995 - IPC

FIELD: chemistry of polymers. SUBSTANCE: method of butadiene-styrene latex preparing involves two-stage polymerization of butadiene with styrene. Ratio of comonomers at the first and second stages is 1:(4.8-4.9). Mass ratio of butadiene and styrene at the first stage is 1:(5-7), and the second one is (3.0-3.3): 1, respectively. Method is realized in the presence of emulsifying agents, electrolyte and molecular mass regulator which is added at both the first and the second stages of process. Regulator concentration at the first stage is 0.19-1.11 wt.-% (as comonomer level at the first stage). Also, styrene can be added at the first stage at the level equal comonomer quantity used at the first stage. EFFECT: increased stability of reaction mass and latex prepared, increased output of process, enhanced physical-mechanical properties of films made of this latex. 2 tbl