Use of vinyl chloride-ethylene copolymers for hydrophobing construction substances

Abstract

Copolymers of ethylene and vinyl chloride also containing a protective colloid, optionally in conjunction with a fatty acid compound or precursor thereof or with an organosilicon compound, can be employed to increase the water repellancy of hydraulically settable construction materials.

1 - 10 . (canceled)  
     
     
         11 . A construction material comprising at least one hydraulically settable mineral binder, and a water repellent composition comprising an aqueous polymer dispersion or water-redispersible powder, said water repellent composition comprising 
 a) a vinyl chloride-ethylene copolymer comprising moieties derived from vinyl chloride in an amount of up to 95% by weight and 5% to 30% by weight of moieties derived from ethylene,    b) 5% to 30% by weight of one or more protective colloids,    c) and when in powder form, 5% to 30% by weight of one or more anti-blocking agents,    the amounts in % by weight being based on the total weight of the polymer powder composition and adding up in each case to 100% by weight based on components a), b), and c).    
     
     
         12 . The material of  claim 11 , wherein at least one protective colloid b) is selected from the group consisting of partially hydrolyzed polyvinyl alcohols having a degree of hydrolysis of 85 to 94 mol % and a Höppler viscosity of 3 to 15 mPas in 4% strength aqueous solution (Höppler method at 20° C., DIN 53015), and partially or fully hydrolyzed copolymers of vinyl acetate with isopropenyl acetate having a degree of hydrolysis of 95 to 100 mol %.  
     
     
         13 . The material of  claim 11 , further comprising at least one additive selected from the group consisting of d1) fatty acids and fatty acid derivatives which under alkaline conditions liberate fatty acid or the corresponding fatty acid anion, and d2) organosilicon compounds.  
     
     
         14 . The material of  claim 12 , further comprising at least one additive selected from the group consisting of d1) fatty acids and fatty acid derivatives which under alkaline conditions liberate fatty acid or the corresponding fatty acid anion, and d2) organosilicon compounds.  
     
     
         15 . The material of  claim 13 , wherein component d1) comprises one or more fatty acid compounds selected from the group consisting of fatty acids having 8 to 22 carbon atoms; their metal soaps; their amides; and their esters with C 1-14  monohydric alcohols, with glycol, with polyglycol, with polyalkylene glycol, with glycerol, with mono-, di- or triethanolamine, and with monosaccharides.  
     
     
         16 . The material of  claim 13 , wherein component d2) comprises at least one silicon compound selected from the group consisting of silicic esters, silanes, polysilanes, organosilanols and di-, oligo- and polysiloxanes.  
     
     
         17 . The material of  claim 11  which is a single-layer coating.  
     
     
         18 . The material of  claim 11 , which is a skim coat or a monocouche coating.  
     
     
         19 . The material of  claim 11  which is a joint filler.  
     
     
         20 . The material of  claim 11 , which comprises a in dry mortar formulation comprising 5% to 50% by weight of mineral binder, 5% to 80% by weight of filler, 0.1% to 10% by weight of polymer, and 0% to 30% by weight of further additives, the amounts in % by weight in the formulation adding up to 100% by weight.  
     
     
         21 . The material of  claim 11 , wherein the water repellant composition polymer is a water-redispersible powder.  
     
     
         22 . A process for the preparation of the construction material of  claim 11 , comprising adding said water repellant composition to said hydraulically settable mineral binder.  
     
     
         23 . A process for the preparation of the construction material of  claim 12 , comprising adding said water repellant composition to said hydraulically settable mineral binder.  
     
     
         24 . A process for the preparation of the construction material of  claim 13 , comprising adding said water repellant composition to said hydraulically settable mineral binder.  
     
     
         25 . A process for the preparation of the construction material of  claim 17 , comprising adding said water repellant composition to said hydraulically settable mineral binder.  
     
     
         26 . A process for the preparation of the construction material of  claim 20 , comprising adding said water repellant composition to said hydraulically settable mineral binder.  
     
     
         27 . The process of  claim 26  further comprising adding water and applying the construction material to a substrate and allowing to set.