POLYVINYL ALCOHOL-STABILIZED RE-DISPERSIBLE POWDERS WITH TINNING ABILITY Russian patent published in 2006 - IPC C08J3/03 C08J3/12 C08F220/38 

FIELD: manufacture of building materials.

SUBSTANCE: invention relates to polyvinyl alcohol-stabilized re-dispersible powders with tinning ability as well as to method of preparing such powders and to employment thereof in building chemistry products, in production of building glues, compositions for finishing, leveling, and Protective coatings, waterproofing suspensions, and solutions for reaming joints and paints. Indicated powders are prepared by drying polyvinyl alcohol-stabilized aqueous dispersions of homo- and copolymers of one or several monomers selected from group including vinyl esters of unbranched or branched alkane-carboxylic acids with 1-18 carbon atoms, (meth)acrylic acid esters with branched or unbranched C₁-C₁₅-alcohols, dienes, olefins, vinylaromatic compounds, and vinyl halides in presence of copolymer of (i) one or several monomers selected from group including ethylenically unsaturated monocarboxylic acids, ethylenically unsaturated dicarboxylic acids and their anhydrides, in each case with 4-8 carbon atoms, and also salts thereof; (ii) one or several ethylenically unsaturated compounds having sulfonic, sulfate, and phosphate groups, and also salts thereof; and (iii) one or several monomers selected from group including vinyl esters of unbranched or branched alkane-carboxylic acids with 1-18 carbon atoms and (meth)acrylic acid esters with branched or unbranched C₁-C₁₅-alcohols; provided that fraction of comonomer (i) units constitutes 10-50 wt %, that of comonomer (ii) units 10-50 wt %, and that of comonomer (iii) units 20-80 wt % based on the total weight of copolymer.

EFFECT: enhanced flowability of building mixes.

13 cl, 2 tbl, 8 ex