Use of polymer powders that are redispersible in water as a binding agent for jointing sand
AssigneeWacker Chemie AG
InventorsRené Gräwe, Gabriele Trifellner
Life of this patent
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Abstract
Dry jointing sand which is swept into joints is consolidated by addition of a powder composition employing either a polyvinyl alcohol-stabilized redispersible polymer powder which contains functional post-crosslinking comonomers, or a redispersible polymer powder stabilized by a polymer of one or more ethylenically unsaturated mono- or dicarboxylic acids and/or anhydrides thereof. The sand is bonded within the joints upon contact with moisture.
Claims19
A process for jointing with sand, comprising forming a jointing composition by adding a binder to dry sand, the binder consisting essentially of a powder composition of one or more redispersible polymer powders, at least one redispersible polymer powder being a functionalized, redispersible polymer powder selected from the group consisting of
- a) polyvinyl alcohol-stabilized copolymers comprising the polymerized product of at least one monomer selected from the group consisting of vinyl esters of straight-chain or branched alkylcarboxylic acids having 1 to 18 carbon atoms;
- (meth)acrylates of branched or straight-chain alcohols or diols having 1 to 18 carbon atoms;
- dienes;
- olefins;
- vinylaromatics;
- and vinyl halides,
- further containing from 0.1 to 20% by weight, based on the total weight of the copolymer, of one or more postcrosslinking comonomers selected from the group consisting of acrylamidoglycolic acid;
- methyl methylacrylamidoglycolate;
- N-methylolacrylamide;
- -methylolmethacrylamide;
- allyl N-methylolcarbamate;
- alkyl ethers and esters of N-methylolacrylamide, of N-methylolmethacrylamide, and of allyl N-methylolcarbamate;
- (meth)acryloyloxypropyltri(alkoxy)silanes;
- vinyltrialkoxysilanes;
- and vinylmethyldialkoxysilanes, and
- b) polymers comprising the polymerized product of at least one monomer selected from the group consisting of vinyl esters of straight-chain or branched alkylcarboxylic acids having 1 to 18 carbon atoms;
- (meth)acrylates of branched or straight-chain alcohols or diols having 1 to 18 carbon atoms;
- dienes;
- olefins;
- vinylaromatics;
- and vinyl halides, said polymers stabilized with polymers comprising ethylenically unsaturated mono- or dicarboxylic acids or anhydrides thereof, having an acid content of from 50 to 99 mol %,
- c) optionally, when copolymer a) is employed, a bifunctional masked aldehyde, and
- d) optionally, a pulverulent acidic or basic additive, and sweeping the jointing composition in dry or moist form into joints.
Dependencies are inferred from the claim text.