| abstract |
A method of producing 0.01 to 70 wt. % aqueous solutions of sulfonated organosilicon compounds having the formula [(HO)3Si-R1-SO3-]xMx+(I) or oligomeric siloxane derivatives thereof, condensed via oxygen bridges. The solution optionally also contains compounds of formula (III) e.g., Si(OH)4 or Al(OH)3, or the like, or derivatives thereof condensed via oxygen bridges. The ratio of Si atoms of formula (I) to the sum of Si and/or Al atoms of formula (III) is 1:0 to 1:3, and the total concentration of compounds (I)+(III) is 0.01 to 70 wt. %. The starting material for the method is a polymeric di-, tri-, or tetrasulfane compound made up of units having the formula: <IMAGE> (IV) wherein R1 has the same meaning as in formula (I), and y=2, 3 or 4. The starting material of formula (IV) is suspended in water. The suspension is mixed at 10 DEG to 100 DEG C. with hydrogen peroxide and is then agitated at 30 DEG to 150 DEG C. until a substantially clear solution is obtained. The solution is cooled and optionally neutralized, freed from any remaining insoluble components, washed and then adjusted to the required concentration. |