Method of producing sulfonated organosilicon compounds and coresponding aqueous solutions

US5380791A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Peter Panster · Rodenbach, DE
• Arno Jaenes · Hasselroth, DE
• Thomas Goebel · Bad Kötzting, DE

Key dates

• Filing date: Dec 18, 1992
• Grant date: Jan 10, 1995
• Expiry date: Dec 18, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07F7/0836
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method of producing 0.01 to 70 wt. % aqueous solutions of sulfonated organosilicon compounds having the formula EQU [(HO).sub.3 Si-R.sup.1 -SO.sub.3.sup.- ].sub.x M.sup.x+ (I) or oligomeric siloxane derivatives thereof, condensed via oxygen bridges. The solution optionally also contains compounds of formula (III) e.g., Si(OH).sub.4 or Al(OH).sub.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: ##STR1## wherein R.sup.1 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.degree. to 100.degree. C. with hydrogen peroxide and is then agitated at 30.degree. to 150.degree. 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.