Process for fixing disruptive substances in papermaking
AssigneeBayer Aktiengesellschaft
InventorsJoachim Konig, Jurgen Kopp, Udo-Winfried Hendricks, Jurgen Reiners, Peter Nowak
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Abstract
Process for fixing anionic interfering substances in papermaking process by the addition of cationic polycondensation products obtained by reacting a) a monofunctional or polyfunctional amine having one or more primary and/or secondary and/or tertiary amino groups with b) cyanamide, dicyandiamide, guanidine or biguanidine, wherein up to 50 mol. % of cyanamide, dicyandiamide or biguanidine may be replaced with a dicarboxylic acid or a mono- or diester thereof, with elimination of ammonia, optionally in the presence of a catalyst, optionally together with other auxiliaries.
Claims9
A process for fixing anionic interfering substances in papermaking by the addition of an anionic trash catcher to a papermaking stock, wherein the anionic trash catcher comprises a cationic polycondensation product obtained by reacting:
- a) a polyfunctional amine of the formula ##STR2## in which, independently of one another, A denotes a substituted or unsubstituted alkylene chain which may be interrupted by hetero atoms and
- R.sup.1 -R.sup.4 denote hydrogen, unsubstituted alkyl or alkyl which is substituted by a substituent selected from the group consisting of OH--, CN-- and O-C.sub.1 -C.sub.4 -alkyl, with
- b) cyanamide, dicyandiamide, guanidine or biguanidine, in an a)/b) molar ratio of 2:1 to 1:2
- in which polycondensation product at least two amino groups of a) have reacted with a compound b) to form the polycondensation product.
Dependencies are inferred from the claim text.