Use of a Cationic Silicon Dioxide Dispersion as a Textile Finishing Agent

Abstract

An aqueous dispersion for use as a finishing agent for textiles, wherein the dispersion contains a pyrogenically produced, aggregated silicon dioxide powder and a cationic polymer which is soluble in the dispersion, wherein the cationic polymer is present in a quantity such that the particles of the silicon dioxide powder exhibit a positive zeta potential.

1 . An aqueous dispersion for use as a finishing agent for textiles, characterised in that the dispersion contains a pyrogenically produced, aggregated silicon dioxide powder and a cationic polymer which is soluble in the dispersion, wherein the cationic polymer is present in a quantity such that the particles of the silicon dioxide powder exhibit a positive zeta potential. 
     
     
         2 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the pyrogenically produced silicon dioxide powder has a specific surface area of 50 to 300 m 2 /g. 
     
     
         3 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the pyrogenically produced silicon dioxide powder is doped with up to 1 wt. % of aluminium oxide or potassium. 
     
     
         4 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that it has a content of silicon dioxide powder of 3 to 50 wt. %. 
     
     
         5 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the content of cationic polymer is between 0.1 wt. % and 15 wt. %, relative to the quantity of cationic polymer and silicon dioxide powder. 
     
     
         6 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the cationic polymer has a molecular weight of less than 100 000 g/mol. 
     
     
         7 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the cationic polymer is a polymer with at least one quaternary ammonium group, a phosphonium group, an acid adduct of a primary, secondary or tertiary amine group, a polyethyleneimine, a polydiallylamine or a polyallylamine, a polyvinylamine, a dicyandiamide condensation product, a dicyandiamide-polyamine cocondensation product, a polyamide-formaldehyde condensation product. 
     
     
         8 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the aggregate size in the dispersion is less than 0.5 μm. 
     
     
         9 . An aqueous dispersion for use as a finishing agent for textiles according to  claim 1 , characterised in that the pH value thereof is between 2 and 8.