Unterbodenschutzmasse, Verfahren zu deren Herstellung sowie Verwendung eines gegebenenfalls synthetischen Calciumcarbonats zur Rheologiesteuerung von Unterbodenschutzmassen

The present invention relates to an underfloor sealing composition for motor vehicles, containing at least one finely divided vinyl chloride homopolymer, copolymer, terpolymer or graft polymer, at least one plasticiser, at least one stabiliser, at least one filler or filler mixture based on calcium carbonate, and at least one adhesion promoter and/or one other auxiliary or additive substance, and also optionally at least one dye, one colour pigment, one solvent and/or diluent medium, characterised in that all or some of the filler, preferably the calcium carbonate, or the filler mixture, preferably the calcium carbonate contained in the filler mixture, have been provided with from 0.3 to 12% by weight, preferably from 1 to 5% by weight (based on 100 parts by weight of the surface-treated calcium carbonate) of a saturated and/or unsaturated, not only at least monocarboxylic but also polar - because it contains at least one polar group - carboxylic acid, dicarboxylic acid, fatty acid, substituted fatty acid, a salt of this compound or fatty acid derivative, preferably at least one hydroxyl-, carbonyl-, carboxyl-, ether- and/or amino-containing aliphatic saturated and/or unsaturated monocarboxylic acid or fatty acid or at least one salt of this monocarboxylic acid which contains at least one polar group and is C2 to C32, preferably C10 to C22, arranged on all or some of the surface of the filler or filler mixture, preferably the calcium carbonate.