METHOD OF PREPARING AQUEOUS DISPERSIONS, EMULSION POLYMERS AND USE THEREOF Russian patent published in 2011 - IPC C08F2/26 C08F36/06 C08F12/08 C09D147/00 C09D125/04 D21H19/56 

FIELD: chemistry.

SUBSTANCE: present invention relates to an emulsion polymerisation method for obtaining aqueous dispersions of a polymer which is different from any chloride-containing polymer. The method involves polymerisation of (a) 20-80 pts.wt conjugated aliphatic dienes, (b) 20-80 pts.wt vinyl aromatic compounds, (c) optionally up to 10 pts.wt ethylenically unsaturated carboxylic acids and/or dicarboxylic acids, preferably 0.1-10 pts.wt, (d) optionally up to 20 pts.wt nitriles of ethylenically unsaturated carboxylic acids, (e) optionally up to 20 pts.wt copolymerisable vinyl compounds different from components (b), (c) and (d), (f) optionally a base, preferably in an amount which is sufficient to neutralise between approximately 1% and approximately 50% carboxylic acid groups of component (c). The method is realised in the presence of water, an initiator(s) and at least one emulsifying agent (g), where the emulsifying agent (g) contains: (g1) at least one sulphated ethoxylated fatty alcohol, having the average number of ethoxy groups n₁, (g2) at least one sulphated ethoxylated fatty alcohol having the average number of ethoxy groups n₂, where: n₂≥n₁ + a×n₁ , a≥0.5, preferably a≥1, and n₁>0, preferably n₁≥2. Emulsifying agents (g1) and (g2) are present in amount of 0.1-5 pts.wt per 100 pts.wt of the total weight of monomer components (a)-(e).

EFFECT: obtaining dispersions of polymers, having low degree of roughness, low yellowness index and high coating capacity.

12 cl, 1 ex, 2 tbl