Patent ID: 6250043
Filing Date: 2001-06-26
Classification: C04B,E04F,Y02W

Abstract:
Method for laying floor coverings on sub-floors, comprising the steps of:a) mixing a primer in the form of a dry mortar mixture based on Portland cement, aluminous cement and calcium sulphate, an expanding cement of type K, which is suitable for the formation of an Ettringite phase, with 0.15 to 1.0 percent by weight of 2,3,4,5-tetrahydroxyadipic acid as a liquefier and 10 to 20 percent by weight each, with respect to the total dry mortar mixture, of a mixture of a) latexed ground hard fibres, b) at least one of glass fibers and polymerizate fibers, c) aminoacid polycondensation fibers and d) polyurethane foam;b) elastifying the primer with a saponification-resistant dispersion of a butadiene/styrene copolymerizate containing carboxyl groups having an emission value maximum of 300 .mu.g/m.sup.3 on day 10 in a quantity of 4 to 8 percent by weight with respect to the total dry primer mixture;c) diluting the mixture obtained with water, applying it to a sub-floor and allowing it to dry to form a fast setting, thin-layer screed;d) applying to the fast-setting, thin-layer screed having an improved footfall sound-proofing index (TSM), a solvent-free synthetic resin dispersion having a emission maximum of 300 .mu.g/m.sup.3, with a water content of not more than 15 percent, with a content of a tackifier based on at least one of natural resin esters and synthetic resins and with a content of an emulsifier based on at least one of sulfated and sulfonated hydroxy-octadecene acids and high molecular triglycerides thereof of 1 to 5 percent by weight, with respect to the synthetic resin dispersion, the tackifier being adjusted to a pH-value of 4 to 6; ande) laying a floor covering thereon.