Use of aqueous polymeric compositions for modifying mineral building material

摘要

Prodn. of modified mineral building materials is effected using an aq. dispersion contg. polymer particles of wt. average dia. 100-300 (pref. 100-200)nm, the polymer being free radically polymerised and being of each of the following 3 types of monomers; (a) up to 5 wt.% (meth)acrylate acid or salts; (b) up to 5 wt.% (meth)acrylamide; and (c) 90-97.5 wt.% other non-ionic, ethylenically unsaturated monomers, pref. styrene and/or butadiene. The dispersions are claimed, as are powders obtd. by spray drying of the dispersions.