| abstract |
A process for the manufacture of paper with improved strength, comprising the steps of: a. forming an aqueous suspension of cellulosic fibers wherein the aqueous suspension contains a sulfite level in excess of 20 ppm, b. add an effective amount of a cationic resin to the aqueous suspension of cellulosic fibers, c. form cellulosic fibers on a sheet, and d. drying the sheet to produce a paper, wherein the improvement in strength is provided by the cationic resin of step (b) and where the cationic resin of step b) comprises a single copolymer component produced from acrylamide, diallyldimethylammonium chloride and glyoxal, wherein the diallyldimethylammonium chloride comprises more than 25% by mole of the copolymer before the reaction with the dialdehyde. |