Water-soluble polycondensation products based on amino-s-triazines and the use thereof

A process for the production of a water-soluble polycondensation product based on amino-s-triazine by condensation in two steps comprising at least one of steps a.sub.1) and a.sub.2), wherein

• step a.sub.1) comprises condensing amino-s-triazine, formaldehyde and sulphite in a mole ratio of 1:0.5 to 5.0:0.1 to 1.5 in aqueous solution at a pH of 9.0 to 12.0 and at a temperature of 40.degree. to 90.degree. C. until the sulphite is no longer detectable;
• and adding near the end of precondensation, per mole of amino-s-triazine, 0.01 to 1.0 mole of a polyoxyalkylene derivative of the general formula:
• ##STR7## wherein X is --NH.sub.2, --NH--CO--NH.sub.2, --O--CO--NH.sub.2 or --O--CO--NH--R.sup.3 --NH--CO--Z;
• R.sup.1 is a hydrogen atom or an aliphatic hydrocarbon radical with up to 4 carbon atoms;
• R.sup.2 is a hydrogen atom, an aliphatic hydrocarbon radical with up to 20 carbon atoms, a cycloaliphatic radical with 5 to 8 carbon atoms, an optionally substituted aromatic hydrocarbon radical with 6 to 10 carbon atoms, or ##STR8## R.sup.3 is an aliphatic hydrocarbon radical with 2 to 18 carbon atoms, a cycloaliphatic hydrocarbon radical with 4 to 15 carbon atoms, an aromatic hydrocarbon radical with 6 to 15 carbon atoms or an araliphatic hydrocarbon radical with 8 to 15 carbon atoms;
• Z is --NH.sub.2 or --NH--CO--NH.sub.2 ;
• and
• n is a number from 1 to 100;
• and wherein step a.sub.2) comprises first reacting an aldehyde acid derivative of the general formula;
• H--CO--R.sup.4
• wherein R.sup.4 is --COOH or a phenyl radical with --COOH, SO.sub.3 H or --PO.sub.3 H.sub.2 or a mono- or divalent salt thereof with the amino-s-triazine in an amount of 0.01 to 1.5 mole per mole of amino-s-triazine at a pH of 4.5 to 6.5 and at a temperature of 20.degree. to 90.degree. C. and subsequently with formaldehyde in an amount of 0.5 to 5.0 mole per mole of amino-s-triazine, optionally with the addition of sulphite and/or of a polyoxyalkylene derivative at a pH value of 9.0 to 12.0 and at a temperature of 40.degree. to 90.degree. C.;
• and
• b) subsequent to step a.sub.1) or a.sub.2), further condensing at a pH of 3.0 to 7.0 and at a temperature of 40.degree. to 90.degree. C. until the viscosity of the solution at 20.degree. C. and a solids content of 20% by weight is from 2 to 10 cSt.