| 摘要 |
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: n2ëÑn1 + aùn1 , aëÑ0.5, preferably aëÑ1, and n1>0, preferably n1ëÑ2. 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 |
