Patent ID: 7431799

Claim:
A process for preparing a water-soluble papermaking polymer additive having a multitude of free primary amino groups effective to form cationically charged complexes with components of a pulp suspension and to form chemical bonds with the pulp comprising: reacting epichlorohydrin and ammonia under a condition to produce tris(3-chloro-2-hydroxypropylamine) and reacting said tris(3-chloro-2-hydroxypropylamine) at the chloro groups with a diamine of formula: H 2 N—R 10 —NH 2 wherein R 10 is a straight or branched chain alkylene of 2 to 10 carbon atoms, or a polyamine of formula: R 11 (NH 2 ) m where R 11 is an aliphatic hydrocarbon radical of 5 to 15 carbon atoms, branched or straight chain, and m is an integer of 3 or 4, provided that the different amino groups are attached to different carbon atoms of the radical R 11 , and reacting the resulting product with tris(3-chloro-2-hydroxypropylamine).