Patent ID: 7960498

Claim:
A composition of matter made by a process comprising: reacting, optionally in a first reaction solvent, at least one multi-arm polyether amine having at least three arms with at least one bifunctional crosslinker of the formula: X 1 —R—X 2 the molar ratio of the multi-arm polyether amine to the bifunctional crosslinker being in the range of about 4:1 to about 50:1, thereby forming a chain-extended polyamine product; and wherein: (i) at least three of the arms of the multi-arm polyether amine are terminated by a primary amine group; (ii) the multi-arm polyether amine has a weight-average molecular weight of about 450 to about 200,000 Daltons; (iii) X 1 —R—X 2 is a polymer having a weight-average molecular weight of about 2,000 to about 20,000 Daltons; (iv) R is a divalent polymer group; (v) X 1 and X 2 are groups capable of reacting with the primary amine group to form a carbon-nitrogen bond; provided that the chain-extended polyamine product is characterized by a solubility in water at 20° C. of at least 20 wt %.