Highly viscous condensation products containing sulfonic acid gr

Details Highly viscous condensation products containing sulfonic acid gr Highly viscous condensation products containing sulfonic acid gr

1996-02-22

1998-08-04

Truong, Duc

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

528251, 528255, 528258, 528265, 524593, 524597, C08G 1240, C08G 1230, C04B 2422

Patent

active

057895260

ABSTRACT:
Disclosed is a highly viscous condensation product containing sulfonic acid groups based on amino-s-triazines with at least 2 amino groups and formaldehyde which has a viscosity of 500 to 100,000 cp at 20.degree. C. and a pH value of 8.0 to 13.0 as an aqueous solution with a solids content of 20% by weight. The product is obtainable by (a) condensation of amino-s-triazine, formaldehyde and sulfite in a molar ratio of 1:1.9 to 2.9:0.7 to 1.3 in aqueous solution at a pH value of 9.0 to 12.0 and a temperature of 50.degree. to 90.degree. C. until the sulfite is no longer detectable, and (b) subsequent further condensation at a pH value of 2.0 to 5.0 and a temperature of 50.degree. to 100.degree. C. until the viscosity exhibits the desired value.

REFERENCES:
patent: 4501939 (1985-02-01), Burge et al.
patent: 5071945 (1991-12-01), Weichmann et al.

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