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A process for preparing polymers of vinylaromatic compounds in dispersion, which comprises conducting the polymerization in the presence of a dispersing auxiliary and a catalyst obtainable from (A) a transition metal complex of subgroup II to VIII, (B) a cation-forming agent and (C), if desired, an aluminum compound; in which the dispersing auxiliary used comprises a block copolymer having at least one diene block B and at least one block S, a copolymer comprising a vinyl aromatic monomer and 1,1-diphenyl ethylene or a derivative thereof substituted by an aromatic ring, including those substituted by C1-C6-alkyl; and in which the dispersing auxiliary is used at an amount of 0.1 to 10 wt%, based on the quantity of the vinyl aromatic compound.
TW087100075A1997-01-091998-01-05Preparation of poly(vinylaromatics) by dispersion polymerization
TW347401B
(en)