Process for the production and use of novel tanning agents and products produced by such process

Claim 1

A PROCESS FOR THE PREPARATION OF A MODIFIED AMINOFORMALDEHYDE RESIN HAVING CATIONIC ACTIVE PROPERTIES AND WHICH IS STABLE IN WATER AND WILL NOT HEAT POLYMERIZE OR CONDENSE THEREIN, COMPRISING REACTING AT A TEMPERATURE IN THE RANGE OF ABOUT 75*C. TO ABOUT 110*C. (A) A WATER-SOLUBLE, AMINO-FORMALDEHYDE RESIN CONTAINING FREE UNREACTED METHYLOL GROUPS WHICH IMPART INSTABILITY TO SAID AMINO-FORMALDEHYDE RESIN IN WATER, SAID AMINO-FORMALDEHYDE RESIN BEING SELECTED FROM THE GROUP CONSISTING OF UREA-FORMALDEHYDE RESINS, THIOUREA-FORMALDEHYDE RESINS, GUANIDIEN-FORMALDEHYDE RESINS, ACETYLENE DIUREA-FORMALDEHYDE RESINS, MELAMINE-FORMALDEHYDE RESINS AND DICYANDIAMIDE-FORMALDEHYDE RESINS WITH (B) A WATER-SOLUBLE AMINO BASE SELECTED FROM THE GROUP CONSISTING OF UREA, THIOUREA, GUANIDIEN, ACETYLENE DIUREA, MELAMINE AND DICYANDIAMIDE, THE WATER-SOLUBLE AMINO BASE BEING IN AN AMOUNT SUFFICIENT TO REACT WITH ALL OF THE METHYLOL GROUPS OF THE AMINO-FORMALDEHYDE RESIN, SAID REACTION BEING CARRIED OUT AT A PH OF ABOUT AT LEAST 7.