Patent ID: 7964669

Claim:
A method for making a thermosetting resin comprising: (a) treating a first polyacrylamide backbone with a first glyoxal component, glyoxalating the first polyacrylamide backbone, and thereby forming a solution of a first partially crosslinked polyacrylamide backbone having a solids content of 17 to 22 weight percent based on a total weight of the solution; (b) adding a second polyacrylamide backbone and a second glyoxal component to the solution and glyoxalating the second polyacrylamide backbone and the first partially crosslinked polyacrylamide backbone in situ and forming the thermosetting resin; wherein the first polyacrylamide backbone has a lower molecular weight than the molecular weight of the second polyacrylamide backbone; and wherein the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5.