34.
    发明专利
    未知

    公开(公告)号:DE19526336A1

    公开(公告)日:1997-01-23

    申请号:DE19526336

    申请日:1995-07-19

    Applicant: BASF AG

    Abstract: 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.

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