Process for the production of sulphonic acid...

Details Process for the production of sulphonic acid... Process for the production of sulphonic acid...

C - Chemistry, Metallurgy

08

G

402/77

C08G 12/40 (2006.01) C08G 12/30 (2006.01)

Patent

CA 1318074

ABSTRACT Process for the production of sulphonic acid group- containing condensation products with a low content of free formaldehyde The present invention provides a process for the production of sulphonic acid group-containing condensation products based on amino-s-triazines with at least two amino groups and formaldehyde with a low content of free formaldehyde, wherein a) an amino-s-triazine, formaldehyde and sulphite is condensed in a mole ratio of 1:1.3 to 6:0.3 to 1.5 in aqueous solution at a pH value of 9.0 to 12.0 and at a temperature of 50 to 90°C. until sulphite is no longer detectable, b) subsequently, further condensation is carried out at a pH value of 2.0 to 7.0 and at a temperature of 50 to 90°C. until the viscosity of the solution is 4 to 1000 mm2/s at 80°C. and c) thereafter the condensation product is subjected to an after-treatment in a strongly alkaline range of pH ? 11.0 and at an elevated temperature.

593552

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