Dry mortars with improved processing properties
AssigneesWacker Polymer Systems GmbH & Co. KG, Brillux GmbH & Co. KG
InventorsFranz Jodlbauer, Felix Asen, Manfred Kugel
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Abstract
The invention provides cementitious dry mortars comprising a) from 0.5 to 80% by weight of cement, b) from 0 to 97% by weight of fillers, c) from 0 to 3.5% by weight of thickeners, wherein a polymer powder composition is present, with d) from 1.0 to 80% by weight of redispersible polymer powder, e) from 0.02 to 4.0% by weight of one or more compounds from the group consisting of zinc oxide, zinc hydroxide, and zinc hydroxide carbonate, f) from 0 to 30% by weight of alkali metal hydroxide and/or alkaline earth metal hydroxide, based in each case on the overall weight of the dry mortar, the percentages by weight adding up to 100% by weight.
Claims16
A cementitious dry mortar comprising
- a) from 0.5 to 80% by weight of cement,
- b) from 0 to 97% by weight of fillers,
- c) from 0 to 3.5% by weight of thickeners,
- d) from 1.0 to 80% by weight of redispersible polymer powder,
- e) from 0.02 to 4.0% by weight of one or more compounds selected from the group consisting of zinc oxide, zinc hydroxide, and zinc hydroxide carbonate,
- f) from 0 to 30% by weight of alkali metal hydroxide and/or alkaline earth metal hydroxide,
- the percentages by weight based in each case on the overall weight of the dry mortar, the percentages by weight adding up to 100% by weight.
A cementitious dry mortar comprising
- a) from 8 to 16% by weight of Portland cement,
- b) from 75 to 90% by weight of one or more fillers from the group consisting of calcium carbonate and/or quartz sand,
- c) from 0.05 to 0.5% by weight of at least one thickener selected from the group consisting of cellulose ethers, modified cellulose ethers, and optionally acetalized and/or hydrophobically modified polyvinyl alcohols,
- d) from 1 to 10% by weight of redispersible powders based on at least one monomer selected from the group consisting of vinyl esters of unbranched or branched C1-15 alkylcarboxylic acids, methacrylic esters of C1-10 alcohols, acrylic esters of C1-10 alcohols, vinylaromatics, olefins, dienes, and vinyl halides,
- e) from 0.05 to 0.5% by weight of zinc oxide, and
- f) from 0.1 to 4% by weight of calcium hydroxide.
A process for preparing a water-containing settable mortar, comprising mixing components a) to f) to a dry mortar and admixing the amount of water required for processing to a settable mortar, optionally adding further individual components subsequently to the preparation of the water-containing settable mortar.
A process for preparing water-containing settable cementitious mortar compositions, comprising separately adding individual components a) to f) to water and mixing to give a water-containing, settable composition.
A process for preparing setting-retarded cementitious mortar compositions, comprising adding to a mixture comprising cement and optional filler, a formulated powder additive comprising at least one redispersible polymer powder d) and at least one compound e) selected from the group consisting of zinc oxide, zinc hydroxide, and zinc hydroxycarbonate, optionally a thickener c) and/or optionally one or more alkali metal hydroxides and/or alkaline earth metal hydroxides.
Dependencies are inferred from the claim text.